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 <span id="projectnumber">v2.00 late beta</span>
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<div class="title">llfio_v2_xxx::directory_handle Class Reference</div> </div>
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<p>A handle to a directory which can be enumerated.
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<p><code>#include "directory_handle.hpp"</code></p>
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Inheritance diagram for llfio_v2_xxx::directory_handle:</div>
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<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="nested-classes"></a>
Classes</h2></td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structllfio__v2__xxx_1_1directory__handle_1_1buffers__type.html">buffers_type</a></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structllfio__v2__xxx_1_1directory__handle_1_1io__request.html">io_request</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft"> </td><td class="mdescRight">The i/o request type used by this handle. <a href="structllfio__v2__xxx_1_1directory__handle_1_1io__request.html#details">More...</a><br /></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr>
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Public Types</h2></td></tr>
<tr class="memitem:a54d63e0972dee77ef1f0ff14bd4f9207"><td class="memItemLeft" align="right" valign="top">enum  </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1directory__handle.html#a54d63e0972dee77ef1f0ff14bd4f9207">filter</a> { <a class="el" href="classllfio__v2__xxx_1_1directory__handle.html#a54d63e0972dee77ef1f0ff14bd4f9207a334c4a4c42fdb79d7ebc3e73b517e6f8">filter::none</a>,
<a class="el" href="classllfio__v2__xxx_1_1directory__handle.html#a54d63e0972dee77ef1f0ff14bd4f9207a14847befc159c1492671b53718fc46f8">filter::fastdeleted</a>
}</td></tr>
<tr class="memdesc:a54d63e0972dee77ef1f0ff14bd4f9207"><td class="mdescLeft"> </td><td class="mdescRight">How to do deleted file elimination on Windows. <a href="classllfio__v2__xxx_1_1directory__handle.html#a54d63e0972dee77ef1f0ff14bd4f9207">More...</a><br /></td></tr>
<tr class="separator:a54d63e0972dee77ef1f0ff14bd4f9207"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a82959a20c5c7f07c71d47cd5953b4516"><td class="memItemLeft" align="right" valign="top"><a id="a82959a20c5c7f07c71d47cd5953b4516"></a>
using </td><td class="memItemRight" valign="bottom"><b>path_type</b> = path_handle::path_type</td></tr>
<tr class="separator:a82959a20c5c7f07c71d47cd5953b4516"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a9a6682e415d0d82fee6d09bb0c774ef8"><td class="memItemLeft" align="right" valign="top"><a id="a9a6682e415d0d82fee6d09bb0c774ef8"></a>
using </td><td class="memItemRight" valign="bottom"><b>extent_type</b> = path_handle::extent_type</td></tr>
<tr class="separator:a9a6682e415d0d82fee6d09bb0c774ef8"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:aafd3eb03845b55c19154cab76956efad"><td class="memItemLeft" align="right" valign="top"><a id="aafd3eb03845b55c19154cab76956efad"></a>
using </td><td class="memItemRight" valign="bottom"><b>size_type</b> = path_handle::size_type</td></tr>
<tr class="separator:aafd3eb03845b55c19154cab76956efad"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:acae677ba35e6cf0f1343e6d857c7c25b"><td class="memItemLeft" align="right" valign="top"><a id="acae677ba35e6cf0f1343e6d857c7c25b"></a>
using </td><td class="memItemRight" valign="bottom"><b>mode</b> = <a class="el" href="classllfio__v2__xxx_1_1handle.html#aa3930273a2d4cabbac309e0b75701dca">path_handle::mode</a></td></tr>
<tr class="separator:acae677ba35e6cf0f1343e6d857c7c25b"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:aee70ec4eedd840ef360470ac9905f78a"><td class="memItemLeft" align="right" valign="top"><a id="aee70ec4eedd840ef360470ac9905f78a"></a>
using </td><td class="memItemRight" valign="bottom"><b>creation</b> = <a class="el" href="classllfio__v2__xxx_1_1handle.html#af0b352d0f273ba6fa70c178b2c2fee42">path_handle::creation</a></td></tr>
<tr class="separator:aee70ec4eedd840ef360470ac9905f78a"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:adf3ed49b617b62ebe9d7514e0d198bb3"><td class="memItemLeft" align="right" valign="top"><a id="adf3ed49b617b62ebe9d7514e0d198bb3"></a>
using </td><td class="memItemRight" valign="bottom"><b>caching</b> = <a class="el" href="classllfio__v2__xxx_1_1handle.html#aecd3a7db6cee3aec07d32fe6f99e6852">path_handle::caching</a></td></tr>
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<tr class="memitem:a1674e6a6953fcda955bba33aac0b3e15"><td class="memItemLeft" align="right" valign="top"><a id="a1674e6a6953fcda955bba33aac0b3e15"></a>
using </td><td class="memItemRight" valign="bottom"><b>flag</b> = path_handle::flag</td></tr>
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<tr class="memitem:a25dd21d41625bdacd384ace8afcd4f95"><td class="memItemLeft" align="right" valign="top"><a id="a25dd21d41625bdacd384ace8afcd4f95"></a>
using </td><td class="memItemRight" valign="bottom"><b>dev_t</b> = fs_handle::dev_t</td></tr>
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<tr class="memitem:a7d856dc3340c48dcc4558520b5081cdb"><td class="memItemLeft" align="right" valign="top"><a id="a7d856dc3340c48dcc4558520b5081cdb"></a>
using </td><td class="memItemRight" valign="bottom"><b>ino_t</b> = fs_handle::ino_t</td></tr>
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<tr class="memitem:af39b5b7a73266dc1dd435f4fb1dfb463"><td class="memItemLeft" align="right" valign="top"><a id="af39b5b7a73266dc1dd435f4fb1dfb463"></a>
using </td><td class="memItemRight" valign="bottom"><b>path_view_type</b> = <a class="el" href="classllfio__v2__xxx_1_1fs__handle.html#abcd8c8171f4e561620864295e8d5879b">fs_handle::path_view_type</a></td></tr>
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<tr class="memitem:a388fc107831ed68dba60c6f4082be952"><td class="memItemLeft" align="right" valign="top"><a id="a388fc107831ed68dba60c6f4082be952"></a>
using </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1directory__handle.html#a388fc107831ed68dba60c6f4082be952">buffer_type</a> = <a class="el" href="structllfio__v2__xxx_1_1directory__entry.html">directory_entry</a></td></tr>
<tr class="memdesc:a388fc107831ed68dba60c6f4082be952"><td class="mdescLeft"> </td><td class="mdescRight">The buffer type used by this handle, which is a <code>directory_entry</code> <br /></td></tr>
<tr class="separator:a388fc107831ed68dba60c6f4082be952"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:afdc2558d4793953d37e680ced76f143a"><td class="memItemLeft" align="right" valign="top"><a id="afdc2558d4793953d37e680ced76f143a"></a>
using </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1directory__handle.html#afdc2558d4793953d37e680ced76f143a">const_buffer_type</a> = <a class="el" href="structllfio__v2__xxx_1_1directory__entry.html">directory_entry</a></td></tr>
<tr class="memdesc:afdc2558d4793953d37e680ced76f143a"><td class="mdescLeft"> </td><td class="mdescRight">The const buffer type used by this handle, which is a <code>directory_entry</code> <br /></td></tr>
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<tr class="memitem:a1a65884346740af7fb4648c79d44a750"><td class="memItemLeft" align="right" valign="top"><a id="a1a65884346740af7fb4648c79d44a750"></a>
using </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1fs__handle.html#a1a65884346740af7fb4648c79d44a750">unique_id_type</a> = QUICKCPPLIB_NAMESPACE::integers128::uint128</td></tr>
<tr class="memdesc:a1a65884346740af7fb4648c79d44a750"><td class="mdescLeft"> </td><td class="mdescRight">The unique identifier type used by this handle. <br /></td></tr>
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<tr class="memitem:ab82a83c5e44659e01a2218f0af41bde7"><td class="memItemLeft" align="right" valign="top"><a id="ab82a83c5e44659e01a2218f0af41bde7"></a>
using </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1fs__handle.html#ab82a83c5e44659e01a2218f0af41bde7">unique_id_type_hasher</a> = QUICKCPPLIB_NAMESPACE::integers128::uint128_hasher</td></tr>
<tr class="memdesc:ab82a83c5e44659e01a2218f0af41bde7"><td class="mdescLeft"> </td><td class="mdescRight">A hasher for the unique identifier type used by this handle. <br /></td></tr>
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</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
Public Member Functions</h2></td></tr>
<tr class="memitem:ad505f506be33c58cf7176878e552d59e"><td class="memItemLeft" align="right" valign="top"><a id="ad505f506be33c58cf7176878e552d59e"></a>
constexpr </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1directory__handle.html#ad505f506be33c58cf7176878e552d59e">directory_handle</a> ()</td></tr>
<tr class="memdesc:ad505f506be33c58cf7176878e552d59e"><td class="mdescLeft"> </td><td class="mdescRight">Default constructor. <br /></td></tr>
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<tr class="memitem:abc2ee09a6199fa2be9869943e6787c1a"><td class="memItemLeft" align="right" valign="top"><a id="abc2ee09a6199fa2be9869943e6787c1a"></a>
constexpr </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1directory__handle.html#abc2ee09a6199fa2be9869943e6787c1a">directory_handle</a> (<a class="el" href="structllfio__v2__xxx_1_1native__handle__type.html">native_handle_type</a> h, dev_t devid, ino_t inode, <a class="el" href="classllfio__v2__xxx_1_1handle.html#aecd3a7db6cee3aec07d32fe6f99e6852">caching</a> <a class="el" href="classllfio__v2__xxx_1_1handle.html#aecd3a7db6cee3aec07d32fe6f99e6852">caching</a>, flag <a class="el" href="classllfio__v2__xxx_1_1handle.html#a013936bc1254b1a47567fe29698d1b1c">flags</a>)</td></tr>
<tr class="memdesc:abc2ee09a6199fa2be9869943e6787c1a"><td class="mdescLeft"> </td><td class="mdescRight">Construct a directory_handle from a supplied native path_handle. <br /></td></tr>
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<tr class="memitem:aa4670fd2bc968291f5e0c8a98d675aae"><td class="memItemLeft" align="right" valign="top"><a id="aa4670fd2bc968291f5e0c8a98d675aae"></a>
constexpr </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1directory__handle.html#aa4670fd2bc968291f5e0c8a98d675aae">directory_handle</a> (<a class="el" href="structllfio__v2__xxx_1_1native__handle__type.html">native_handle_type</a> h, <a class="el" href="classllfio__v2__xxx_1_1handle.html#aecd3a7db6cee3aec07d32fe6f99e6852">caching</a> <a class="el" href="classllfio__v2__xxx_1_1handle.html#aecd3a7db6cee3aec07d32fe6f99e6852">caching</a>, flag <a class="el" href="classllfio__v2__xxx_1_1handle.html#a013936bc1254b1a47567fe29698d1b1c">flags</a>)</td></tr>
<tr class="memdesc:aa4670fd2bc968291f5e0c8a98d675aae"><td class="mdescLeft"> </td><td class="mdescRight">Construct a directory_handle from a supplied native path_handle. <br /></td></tr>
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<tr class="memitem:a20f3e10dfd3f2cfa80cc14b6987b9552"><td class="memItemLeft" align="right" valign="top"><a id="a20f3e10dfd3f2cfa80cc14b6987b9552"></a>
constexpr </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1directory__handle.html#a20f3e10dfd3f2cfa80cc14b6987b9552">directory_handle</a> (<a class="el" href="classllfio__v2__xxx_1_1directory__handle.html">directory_handle</a> &&o) noexcept</td></tr>
<tr class="memdesc:a20f3e10dfd3f2cfa80cc14b6987b9552"><td class="mdescLeft"> </td><td class="mdescRight">Implicit move construction of directory_handle permitted. <br /></td></tr>
<tr class="separator:a20f3e10dfd3f2cfa80cc14b6987b9552"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:aa670b617d883625a9532ab12c65469d8"><td class="memItemLeft" align="right" valign="top"><a id="aa670b617d883625a9532ab12c65469d8"></a>
 </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1directory__handle.html#aa670b617d883625a9532ab12c65469d8">directory_handle</a> (const <a class="el" href="classllfio__v2__xxx_1_1directory__handle.html">directory_handle</a> &)=delete</td></tr>
<tr class="memdesc:aa670b617d883625a9532ab12c65469d8"><td class="mdescLeft"> </td><td class="mdescRight">No copy construction (use <code>clone()</code>) <br /></td></tr>
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<tr class="memitem:a993f752761d4488d717c95887ab3e824"><td class="memItemLeft" align="right" valign="top"><a id="a993f752761d4488d717c95887ab3e824"></a>
constexpr </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1directory__handle.html#a993f752761d4488d717c95887ab3e824">directory_handle</a> (<a class="el" href="classllfio__v2__xxx_1_1handle.html">handle</a> &&o, dev_t devid, ino_t inode) noexcept</td></tr>
<tr class="memdesc:a993f752761d4488d717c95887ab3e824"><td class="mdescLeft"> </td><td class="mdescRight">Explicit conversion from handle permitted. <br /></td></tr>
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<tr class="memitem:a42cba9c448ac59e4f7057e01eb0ddf49"><td class="memItemLeft" align="right" valign="top"><a id="a42cba9c448ac59e4f7057e01eb0ddf49"></a>
<a class="el" href="classllfio__v2__xxx_1_1directory__handle.html">directory_handle</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1directory__handle.html#a42cba9c448ac59e4f7057e01eb0ddf49">operator=</a> (<a class="el" href="classllfio__v2__xxx_1_1directory__handle.html">directory_handle</a> &&o) noexcept</td></tr>
<tr class="memdesc:a42cba9c448ac59e4f7057e01eb0ddf49"><td class="mdescLeft"> </td><td class="mdescRight">Move assignment of directory_handle permitted. <br /></td></tr>
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<tr class="memitem:a9acfca399be5d868fe659fce5166d630"><td class="memItemLeft" align="right" valign="top"><a id="a9acfca399be5d868fe659fce5166d630"></a>
<a class="el" href="classllfio__v2__xxx_1_1directory__handle.html">directory_handle</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1directory__handle.html#a9acfca399be5d868fe659fce5166d630">operator=</a> (const <a class="el" href="classllfio__v2__xxx_1_1directory__handle.html">directory_handle</a> &)=delete</td></tr>
<tr class="memdesc:a9acfca399be5d868fe659fce5166d630"><td class="mdescLeft"> </td><td class="mdescRight">No copy assignment. <br /></td></tr>
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<tr class="memitem:a988fca7e79f17902068f2fe8f0356782"><td class="memItemLeft" align="right" valign="top"><a id="a988fca7e79f17902068f2fe8f0356782"></a>
void </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1directory__handle.html#a988fca7e79f17902068f2fe8f0356782">swap</a> (<a class="el" href="classllfio__v2__xxx_1_1directory__handle.html">directory_handle</a> &o) noexcept</td></tr>
<tr class="memdesc:a988fca7e79f17902068f2fe8f0356782"><td class="mdescLeft"> </td><td class="mdescRight">Swap with another instance. <br /></td></tr>
<tr class="separator:a988fca7e79f17902068f2fe8f0356782"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a8eb4f8792e37c370d5f53c643699f8b7"><td class="memItemLeft" align="right" valign="top"><a id="a8eb4f8792e37c370d5f53c643699f8b7"></a>
virtual result< void > </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1directory__handle.html#a8eb4f8792e37c370d5f53c643699f8b7">close</a> () noexcept override</td></tr>
<tr class="memdesc:a8eb4f8792e37c370d5f53c643699f8b7"><td class="mdescLeft"> </td><td class="mdescRight">Immediately close the native handle type managed by this handle. <br /></td></tr>
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<tr class="memitem:ac65718d52cac467dcc1cb814bd91d537"><td class="memItemLeft" align="right" valign="top">virtual result< <a class="el" href="classllfio__v2__xxx_1_1directory__handle.html">directory_handle</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1directory__handle.html#ac65718d52cac467dcc1cb814bd91d537">reopen</a> (<a class="el" href="classllfio__v2__xxx_1_1handle.html#aa3930273a2d4cabbac309e0b75701dca">mode</a> mode_=mode::unchanged, <a class="el" href="classllfio__v2__xxx_1_1handle.html#aecd3a7db6cee3aec07d32fe6f99e6852">caching</a> caching_=caching::unchanged, <a class="el" href="structllfio__v2__xxx_1_1deadline.html">deadline</a> d=std::chrono::seconds(30)) const noexcept</td></tr>
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template<class... Args> </td></tr>
<tr class="memitem:a3ccae4bed19960a3059b5c3bfadceafd"><td class="memTemplItemLeft" align="right" valign="top">bool </td><td class="memTemplItemRight" valign="bottom"><b>try_reopen</b> (Args &&... args) noexcept</td></tr>
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template<class... Args, class Rep , class Period > </td></tr>
<tr class="memitem:aafd16281ceb81c2901297c61248e4458"><td class="memTemplItemLeft" align="right" valign="top">bool </td><td class="memTemplItemRight" valign="bottom"><b>try_reopen_for</b> (Args &&... args, const std::chrono::duration< Rep, Period > &duration) noexcept</td></tr>
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template<class... Args, class Clock , class Duration > </td></tr>
<tr class="memitem:ac7f52299db09ae2fb3fdd022c0cb9465"><td class="memTemplItemLeft" align="right" valign="top">bool </td><td class="memTemplItemRight" valign="bottom"><b>try_reopen_until</b> (Args &&... args, const std::chrono::time_point< Clock, Duration > &timeout) noexcept</td></tr>
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<tr class="memitem:aa0b7dc541e6188fed2950444089fed6c"><td class="memItemLeft" align="right" valign="top">result< <a class="el" href="classllfio__v2__xxx_1_1path__handle.html">path_handle</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1directory__handle.html#aa0b7dc541e6188fed2950444089fed6c">clone_to_path_handle</a> () const noexcept</td></tr>
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<tr class="memitem:ab27aadf3740715dc8c5d7cd5a194d57e"><td class="memItemLeft" align="right" valign="top">virtual result< <a class="el" href="structllfio__v2__xxx_1_1directory__handle_1_1buffers__type.html">buffers_type</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1directory__handle.html#ab27aadf3740715dc8c5d7cd5a194d57e">read</a> (<a class="el" href="structllfio__v2__xxx_1_1directory__handle_1_1io__request.html">io_request</a>< <a class="el" href="structllfio__v2__xxx_1_1directory__handle_1_1buffers__type.html">buffers_type</a> > req, <a class="el" href="structllfio__v2__xxx_1_1deadline.html">deadline</a> d=std::chrono::seconds(30)) const noexcept</td></tr>
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<tr class="memitem:a8752c5e4f4189c7bdfcd6eccb637bef9"><td class="memItemLeft" align="right" valign="top"><a id="a8752c5e4f4189c7bdfcd6eccb637bef9"></a>
void </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1path__handle.html#a8752c5e4f4189c7bdfcd6eccb637bef9">swap</a> (<a class="el" href="classllfio__v2__xxx_1_1path__handle.html">path_handle</a> &o) noexcept</td></tr>
<tr class="memdesc:a8752c5e4f4189c7bdfcd6eccb637bef9"><td class="mdescLeft"> </td><td class="mdescRight">Swap with another instance. <br /></td></tr>
<tr class="separator:a8752c5e4f4189c7bdfcd6eccb637bef9"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a4716696b8700953889006251e0678aa4"><td class="memItemLeft" align="right" valign="top"><a id="a4716696b8700953889006251e0678aa4"></a>
void </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a4716696b8700953889006251e0678aa4">swap</a> (<a class="el" href="classllfio__v2__xxx_1_1handle.html">handle</a> &o) noexcept</td></tr>
<tr class="memdesc:a4716696b8700953889006251e0678aa4"><td class="mdescLeft"> </td><td class="mdescRight">Swap with another instance. <br /></td></tr>
<tr class="separator:a4716696b8700953889006251e0678aa4"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a03229b163152b540c3eb6edd41cf5d32"><td class="memItemLeft" align="right" valign="top">result< bool > </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1path__handle.html#a03229b163152b540c3eb6edd41cf5d32">exists</a> (<a class="el" href="classllfio__v2__xxx_1_1path__view.html">path_view_type</a> <a class="el" href="classllfio__v2__xxx_1_1path__handle.html#a579c3752604c65325d16a6f8c818c6ab">path</a>) const noexcept</td></tr>
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<tr class="memitem:ac5222904f116c9beb0515a4a5aa850bf"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#ac5222904f116c9beb0515a4a5aa850bf">QUICKCPPLIB_BITFIELD_BEGIN</a> (flag)</td></tr>
<tr class="memdesc:ac5222904f116c9beb0515a4a5aa850bf"><td class="mdescLeft"> </td><td class="mdescRight">Bitwise flags which can be specified. <a href="classllfio__v2__xxx_1_1handle.html#ac5222904f116c9beb0515a4a5aa850bf">More...</a><br /></td></tr>
<tr class="separator:ac5222904f116c9beb0515a4a5aa850bf"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:aa7e9bedf8c7a4c4a79a644a6e1857ee4"><td class="memItemLeft" align="right" valign="top"><a id="aa7e9bedf8c7a4c4a79a644a6e1857ee4"></a>
 </td><td class="memItemRight" valign="bottom"><b>QUICKCPPLIB_BITFIELD_END</b> (flag)</td></tr>
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<tr class="memitem:a00a85eec5a41f7edb2c574d40cf04535"><td class="memItemLeft" align="right" valign="top">virtual result< path_type > </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a00a85eec5a41f7edb2c574d40cf04535">current_path</a> () const noexcept</td></tr>
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<tr class="memitem:aeea4389189021b94dde6d8f2c3ccc5b3"><td class="memItemLeft" align="right" valign="top">result< <a class="el" href="classllfio__v2__xxx_1_1handle.html">handle</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#aeea4389189021b94dde6d8f2c3ccc5b3">clone</a> () const noexcept</td></tr>
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<tr class="memitem:a1d273e38c061eb11f5012f624e9a202e"><td class="memItemLeft" align="right" valign="top"><a id="a1d273e38c061eb11f5012f624e9a202e"></a>
virtual <a class="el" href="structllfio__v2__xxx_1_1native__handle__type.html">native_handle_type</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a1d273e38c061eb11f5012f624e9a202e">release</a> () noexcept</td></tr>
<tr class="memdesc:a1d273e38c061eb11f5012f624e9a202e"><td class="mdescLeft"> </td><td class="mdescRight">Release the native handle type managed by this handle. <br /></td></tr>
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<tr class="memitem:a5c7f6a0a8ffdea22763c75a9319ba0c2"><td class="memItemLeft" align="right" valign="top"><a id="a5c7f6a0a8ffdea22763c75a9319ba0c2"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a5c7f6a0a8ffdea22763c75a9319ba0c2">is_valid</a> () const noexcept</td></tr>
<tr class="memdesc:a5c7f6a0a8ffdea22763c75a9319ba0c2"><td class="mdescLeft"> </td><td class="mdescRight">True if the handle is valid (and usually open) <br /></td></tr>
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<tr class="memitem:a97e0884c27147b4929be98961b8e9254"><td class="memItemLeft" align="right" valign="top"><a id="a97e0884c27147b4929be98961b8e9254"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a97e0884c27147b4929be98961b8e9254">is_readable</a> () const noexcept</td></tr>
<tr class="memdesc:a97e0884c27147b4929be98961b8e9254"><td class="mdescLeft"> </td><td class="mdescRight">True if the handle is readable. <br /></td></tr>
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<tr class="memitem:a211fee447a47bdeb5424a2a5ae1de852"><td class="memItemLeft" align="right" valign="top"><a id="a211fee447a47bdeb5424a2a5ae1de852"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a211fee447a47bdeb5424a2a5ae1de852">is_writable</a> () const noexcept</td></tr>
<tr class="memdesc:a211fee447a47bdeb5424a2a5ae1de852"><td class="mdescLeft"> </td><td class="mdescRight">True if the handle is writable. <br /></td></tr>
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<tr class="memitem:ac3aa3dc009822c0e437f317864534feb"><td class="memItemLeft" align="right" valign="top"><a id="ac3aa3dc009822c0e437f317864534feb"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#ac3aa3dc009822c0e437f317864534feb">is_append_only</a> () const noexcept</td></tr>
<tr class="memdesc:ac3aa3dc009822c0e437f317864534feb"><td class="mdescLeft"> </td><td class="mdescRight">True if the handle is append only. <br /></td></tr>
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<tr class="memitem:a101620e9fff0c0e8c346af0e9de58b6a"><td class="memItemLeft" align="right" valign="top">virtual result< void > </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a101620e9fff0c0e8c346af0e9de58b6a">set_append_only</a> (bool enable) noexcept</td></tr>
<tr class="memdesc:a101620e9fff0c0e8c346af0e9de58b6a"><td class="mdescLeft"> </td><td class="mdescRight">EXTENSION: Changes whether this handle is append only or not. <a href="classllfio__v2__xxx_1_1handle.html#a101620e9fff0c0e8c346af0e9de58b6a">More...</a><br /></td></tr>
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<tr class="memitem:ade2416b9154d1e56937c99cd514324f8"><td class="memItemLeft" align="right" valign="top"><a id="ade2416b9154d1e56937c99cd514324f8"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#ade2416b9154d1e56937c99cd514324f8">is_multiplexable</a> () const noexcept</td></tr>
<tr class="memdesc:ade2416b9154d1e56937c99cd514324f8"><td class="mdescLeft"> </td><td class="mdescRight">True if multiplexable. <br /></td></tr>
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<tr class="memitem:a501aa723172f6852e82738b0969278ae"><td class="memItemLeft" align="right" valign="top"><a id="a501aa723172f6852e82738b0969278ae"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a501aa723172f6852e82738b0969278ae">is_nonblocking</a> () const noexcept</td></tr>
<tr class="memdesc:a501aa723172f6852e82738b0969278ae"><td class="mdescLeft"> </td><td class="mdescRight">True if nonblocking. <br /></td></tr>
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<tr class="memitem:a695ce0ed1606d540cfa452790ea71632"><td class="memItemLeft" align="right" valign="top"><a id="a695ce0ed1606d540cfa452790ea71632"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a695ce0ed1606d540cfa452790ea71632">is_seekable</a> () const noexcept</td></tr>
<tr class="memdesc:a695ce0ed1606d540cfa452790ea71632"><td class="mdescLeft"> </td><td class="mdescRight">True if seekable. <br /></td></tr>
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<tr class="memitem:a751e912d8dab755ea969a418c1d544eb"><td class="memItemLeft" align="right" valign="top"><a id="a751e912d8dab755ea969a418c1d544eb"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a751e912d8dab755ea969a418c1d544eb">requires_aligned_io</a> () const noexcept</td></tr>
<tr class="memdesc:a751e912d8dab755ea969a418c1d544eb"><td class="mdescLeft"> </td><td class="mdescRight">True if requires aligned i/o. <br /></td></tr>
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<tr class="memitem:a7751fbb4b1aff527f469412ea33116ed"><td class="memItemLeft" align="right" valign="top"><a id="a7751fbb4b1aff527f469412ea33116ed"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a7751fbb4b1aff527f469412ea33116ed">is_regular</a> () const noexcept</td></tr>
<tr class="memdesc:a7751fbb4b1aff527f469412ea33116ed"><td class="mdescLeft"> </td><td class="mdescRight">True if a regular file or device. <br /></td></tr>
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<tr class="memitem:a4ca48bdcd6d6bf8b41d0cebb304fe9ce"><td class="memItemLeft" align="right" valign="top"><a id="a4ca48bdcd6d6bf8b41d0cebb304fe9ce"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a4ca48bdcd6d6bf8b41d0cebb304fe9ce">is_directory</a> () const noexcept</td></tr>
<tr class="memdesc:a4ca48bdcd6d6bf8b41d0cebb304fe9ce"><td class="mdescLeft"> </td><td class="mdescRight">True if a directory. <br /></td></tr>
<tr class="separator:a4ca48bdcd6d6bf8b41d0cebb304fe9ce"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ae0d5de068f71628e9491c5669f89dca0"><td class="memItemLeft" align="right" valign="top"><a id="ae0d5de068f71628e9491c5669f89dca0"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#ae0d5de068f71628e9491c5669f89dca0">is_symlink</a> () const noexcept</td></tr>
<tr class="memdesc:ae0d5de068f71628e9491c5669f89dca0"><td class="mdescLeft"> </td><td class="mdescRight">True if a symlink. <br /></td></tr>
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<tr class="memitem:ac52242425f6e71c3fddcb6cdbe2c3b4e"><td class="memItemLeft" align="right" valign="top"><a id="ac52242425f6e71c3fddcb6cdbe2c3b4e"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#ac52242425f6e71c3fddcb6cdbe2c3b4e">is_pipe</a> () const noexcept</td></tr>
<tr class="memdesc:ac52242425f6e71c3fddcb6cdbe2c3b4e"><td class="mdescLeft"> </td><td class="mdescRight">True if a pipe. <br /></td></tr>
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<tr class="memitem:ac9280ab1e6f2a65bc73ee0cba5a8deea"><td class="memItemLeft" align="right" valign="top"><a id="ac9280ab1e6f2a65bc73ee0cba5a8deea"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#ac9280ab1e6f2a65bc73ee0cba5a8deea">is_socket</a> () const noexcept</td></tr>
<tr class="memdesc:ac9280ab1e6f2a65bc73ee0cba5a8deea"><td class="mdescLeft"> </td><td class="mdescRight">True if a socket. <br /></td></tr>
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<tr class="memitem:a018de0f7c177e3cff239016d14582e9a"><td class="memItemLeft" align="right" valign="top"><a id="a018de0f7c177e3cff239016d14582e9a"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a018de0f7c177e3cff239016d14582e9a">is_multiplexer</a> () const noexcept</td></tr>
<tr class="memdesc:a018de0f7c177e3cff239016d14582e9a"><td class="mdescLeft"> </td><td class="mdescRight">True if a multiplexer like BSD kqueues, Linux epoll or Windows IOCP. <br /></td></tr>
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<tr class="memitem:ade0d0e05b844e77f425669da87bf48bb"><td class="memItemLeft" align="right" valign="top"><a id="ade0d0e05b844e77f425669da87bf48bb"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#ade0d0e05b844e77f425669da87bf48bb">is_process</a> () const noexcept</td></tr>
<tr class="memdesc:ade0d0e05b844e77f425669da87bf48bb"><td class="mdescLeft"> </td><td class="mdescRight">True if a process. <br /></td></tr>
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<tr class="memitem:a354c9168af7759f7151a071c1e1b7b19"><td class="memItemLeft" align="right" valign="top"><a id="a354c9168af7759f7151a071c1e1b7b19"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a354c9168af7759f7151a071c1e1b7b19">is_section</a> () const noexcept</td></tr>
<tr class="memdesc:a354c9168af7759f7151a071c1e1b7b19"><td class="mdescLeft"> </td><td class="mdescRight">True if a memory section. <br /></td></tr>
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<tr class="memitem:a028fbead3b3c4d4eed2da7fa51c75036"><td class="memItemLeft" align="right" valign="top"><a id="a028fbead3b3c4d4eed2da7fa51c75036"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a028fbead3b3c4d4eed2da7fa51c75036">is_allocation</a> () const noexcept</td></tr>
<tr class="memdesc:a028fbead3b3c4d4eed2da7fa51c75036"><td class="mdescLeft"> </td><td class="mdescRight">True if a memory allocation. <br /></td></tr>
<tr class="separator:a028fbead3b3c4d4eed2da7fa51c75036"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a90bf8668df002dac5a7d9397486b2946"><td class="memItemLeft" align="right" valign="top"><a id="a90bf8668df002dac5a7d9397486b2946"></a>
<a class="el" href="classllfio__v2__xxx_1_1handle.html#aecd3a7db6cee3aec07d32fe6f99e6852">caching</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a90bf8668df002dac5a7d9397486b2946">kernel_caching</a> () const noexcept</td></tr>
<tr class="memdesc:a90bf8668df002dac5a7d9397486b2946"><td class="mdescLeft"> </td><td class="mdescRight">Kernel cache strategy used by this handle. <br /></td></tr>
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<tr class="memitem:a7126a726b2a06e4c1eca1a94c41163ff"><td class="memItemLeft" align="right" valign="top"><a id="a7126a726b2a06e4c1eca1a94c41163ff"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a7126a726b2a06e4c1eca1a94c41163ff">are_reads_from_cache</a> () const noexcept</td></tr>
<tr class="memdesc:a7126a726b2a06e4c1eca1a94c41163ff"><td class="mdescLeft"> </td><td class="mdescRight">True if the handle uses the kernel page cache for reads. <br /></td></tr>
<tr class="separator:a7126a726b2a06e4c1eca1a94c41163ff"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a8036792f332459064172d7b0cfaee3cf"><td class="memItemLeft" align="right" valign="top"><a id="a8036792f332459064172d7b0cfaee3cf"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a8036792f332459064172d7b0cfaee3cf">are_writes_durable</a> () const noexcept</td></tr>
<tr class="memdesc:a8036792f332459064172d7b0cfaee3cf"><td class="mdescLeft"> </td><td class="mdescRight">True if writes are safely on storage on completion. <br /></td></tr>
<tr class="separator:a8036792f332459064172d7b0cfaee3cf"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a0a2a5896f5e373fa032cdae1c1fff2c1"><td class="memItemLeft" align="right" valign="top"><a id="a0a2a5896f5e373fa032cdae1c1fff2c1"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a0a2a5896f5e373fa032cdae1c1fff2c1">are_safety_barriers_issued</a> () const noexcept</td></tr>
<tr class="memdesc:a0a2a5896f5e373fa032cdae1c1fff2c1"><td class="mdescLeft"> </td><td class="mdescRight">True if issuing safety fsyncs is on. <br /></td></tr>
<tr class="separator:a0a2a5896f5e373fa032cdae1c1fff2c1"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a013936bc1254b1a47567fe29698d1b1c"><td class="memItemLeft" align="right" valign="top"><a id="a013936bc1254b1a47567fe29698d1b1c"></a>
flag </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a013936bc1254b1a47567fe29698d1b1c">flags</a> () const noexcept</td></tr>
<tr class="memdesc:a013936bc1254b1a47567fe29698d1b1c"><td class="mdescLeft"> </td><td class="mdescRight">The flags this handle was opened with. <br /></td></tr>
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<tr class="memitem:a942b0d276c9f20fe41baab679b88fe72"><td class="memItemLeft" align="right" valign="top"><a id="a942b0d276c9f20fe41baab679b88fe72"></a>
<a class="el" href="structllfio__v2__xxx_1_1native__handle__type.html">native_handle_type</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a942b0d276c9f20fe41baab679b88fe72">native_handle</a> () const noexcept</td></tr>
<tr class="memdesc:a942b0d276c9f20fe41baab679b88fe72"><td class="mdescLeft"> </td><td class="mdescRight">The native handle used by this handle. <br /></td></tr>
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<tr class="memitem:ac24ed4cdb96690d7da95cd17b0f3d090"><td class="memItemLeft" align="right" valign="top"><a id="ac24ed4cdb96690d7da95cd17b0f3d090"></a>
dev_t </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1fs__handle.html#ac24ed4cdb96690d7da95cd17b0f3d090">st_dev</a> () const noexcept</td></tr>
<tr class="memdesc:ac24ed4cdb96690d7da95cd17b0f3d090"><td class="mdescLeft"> </td><td class="mdescRight">Unless <code>flag::disable_safety_unlinks</code> is set, the device id of the file when opened. <br /></td></tr>
<tr class="separator:ac24ed4cdb96690d7da95cd17b0f3d090"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:aad6465d30ee438b860ccc59c0e0fc4dc"><td class="memItemLeft" align="right" valign="top"><a id="aad6465d30ee438b860ccc59c0e0fc4dc"></a>
ino_t </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1fs__handle.html#aad6465d30ee438b860ccc59c0e0fc4dc">st_ino</a> () const noexcept</td></tr>
<tr class="memdesc:aad6465d30ee438b860ccc59c0e0fc4dc"><td class="mdescLeft"> </td><td class="mdescRight">Unless <code>flag::disable_safety_unlinks</code> is set, the inode of the file when opened. When combined with st_dev(), forms a unique identifer on this system. <br /></td></tr>
<tr class="separator:aad6465d30ee438b860ccc59c0e0fc4dc"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a9793fe40564fda2437783488bd51b9f1"><td class="memItemLeft" align="right" valign="top"><a id="a9793fe40564fda2437783488bd51b9f1"></a>
<a class="el" href="classllfio__v2__xxx_1_1fs__handle.html#a1a65884346740af7fb4648c79d44a750">unique_id_type</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1fs__handle.html#a9793fe40564fda2437783488bd51b9f1">unique_id</a> () const noexcept</td></tr>
<tr class="memdesc:a9793fe40564fda2437783488bd51b9f1"><td class="mdescLeft"> </td><td class="mdescRight">A unique identifier for this handle across the entire system. Can be used in hash tables etc. <br /></td></tr>
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<tr class="memitem:a865caad2f7f4bdf12fb74aabfe3c5ff5"><td class="memItemLeft" align="right" valign="top">virtual result< <a class="el" href="classllfio__v2__xxx_1_1path__handle.html">path_handle</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1fs__handle.html#a865caad2f7f4bdf12fb74aabfe3c5ff5">parent_path_handle</a> (<a class="el" href="structllfio__v2__xxx_1_1deadline.html">deadline</a> d=std::chrono::seconds(30)) const noexcept</td></tr>
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<tr class="memitem:a1eeaf9d77a1279b4f0d3062de509f77f"><td class="memTemplParams" colspan="2"><a id="a1eeaf9d77a1279b4f0d3062de509f77f"></a>
template<class... Args> </td></tr>
<tr class="memitem:a1eeaf9d77a1279b4f0d3062de509f77f"><td class="memTemplItemLeft" align="right" valign="top">bool </td><td class="memTemplItemRight" valign="bottom"><b>try_parent_path_handle</b> (Args &&... args) noexcept</td></tr>
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<tr class="memitem:a41ea4bd2d5a66fbde4cdbfe463166a4f"><td class="memTemplParams" colspan="2"><a id="a41ea4bd2d5a66fbde4cdbfe463166a4f"></a>
template<class... Args, class Rep , class Period > </td></tr>
<tr class="memitem:a41ea4bd2d5a66fbde4cdbfe463166a4f"><td class="memTemplItemLeft" align="right" valign="top">bool </td><td class="memTemplItemRight" valign="bottom"><b>try_parent_path_handle_for</b> (Args &&... args, const std::chrono::duration< Rep, Period > &duration) noexcept</td></tr>
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template<class... Args, class Clock , class Duration > </td></tr>
<tr class="memitem:acbb1fe8c7901382307d84848fdc0afcb"><td class="memTemplItemLeft" align="right" valign="top">bool </td><td class="memTemplItemRight" valign="bottom"><b>try_parent_path_handle_until</b> (Args &&... args, const std::chrono::time_point< Clock, Duration > &timeout) noexcept</td></tr>
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<tr class="memitem:a8700edc9ecd4dd35d5aad7c65dd0eca2"><td class="memItemLeft" align="right" valign="top">virtual result< void > </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1fs__handle.html#a8700edc9ecd4dd35d5aad7c65dd0eca2">relink</a> (const <a class="el" href="classllfio__v2__xxx_1_1path__handle.html">path_handle</a> &base, <a class="el" href="classllfio__v2__xxx_1_1path__view.html">path_view_type</a> <a class="el" href="classllfio__v2__xxx_1_1path__handle.html#a579c3752604c65325d16a6f8c818c6ab">path</a>, bool atomic_replace=true, <a class="el" href="structllfio__v2__xxx_1_1deadline.html">deadline</a> d=std::chrono::seconds(30)) noexcept</td></tr>
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<tr class="memitem:a7f5f9892f6652359f2330bf6d9b89e17"><td class="memTemplParams" colspan="2"><a id="a7f5f9892f6652359f2330bf6d9b89e17"></a>
template<class... Args> </td></tr>
<tr class="memitem:a7f5f9892f6652359f2330bf6d9b89e17"><td class="memTemplItemLeft" align="right" valign="top">bool </td><td class="memTemplItemRight" valign="bottom"><b>try_relink</b> (Args &&... args) noexcept</td></tr>
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template<class... Args, class Rep , class Period > </td></tr>
<tr class="memitem:af5565cd5f2fcbb9472b2a00795cc0bcc"><td class="memTemplItemLeft" align="right" valign="top">bool </td><td class="memTemplItemRight" valign="bottom"><b>try_relink_for</b> (Args &&... args, const std::chrono::duration< Rep, Period > &duration) noexcept</td></tr>
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template<class... Args, class Clock , class Duration > </td></tr>
<tr class="memitem:a1fc4e2ade67dfb9140007cc31f4b6b20"><td class="memTemplItemLeft" align="right" valign="top">bool </td><td class="memTemplItemRight" valign="bottom"><b>try_relink_until</b> (Args &&... args, const std::chrono::time_point< Clock, Duration > &timeout) noexcept</td></tr>
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<tr class="memitem:aa7770c6b7c478d74654f25b8c1a1585c"><td class="memItemLeft" align="right" valign="top">virtual result< void > </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1fs__handle.html#aa7770c6b7c478d74654f25b8c1a1585c">link</a> (const <a class="el" href="classllfio__v2__xxx_1_1path__handle.html">path_handle</a> &base, <a class="el" href="classllfio__v2__xxx_1_1path__view.html">path_view_type</a> <a class="el" href="classllfio__v2__xxx_1_1path__handle.html#a579c3752604c65325d16a6f8c818c6ab">path</a>, <a class="el" href="structllfio__v2__xxx_1_1deadline.html">deadline</a> d=std::chrono::seconds(30)) noexcept</td></tr>
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<tr class="memitem:ad43b812385c7fc8aae9e59838a1411bb"><td class="memTemplParams" colspan="2"><a id="ad43b812385c7fc8aae9e59838a1411bb"></a>
template<class... Args> </td></tr>
<tr class="memitem:ad43b812385c7fc8aae9e59838a1411bb"><td class="memTemplItemLeft" align="right" valign="top">bool </td><td class="memTemplItemRight" valign="bottom"><b>try_link</b> (Args &&... args) noexcept</td></tr>
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template<class... Args, class Rep , class Period > </td></tr>
<tr class="memitem:a65d73e0e89bac484ce40427b58dcfe53"><td class="memTemplItemLeft" align="right" valign="top">bool </td><td class="memTemplItemRight" valign="bottom"><b>try_link_for</b> (Args &&... args, const std::chrono::duration< Rep, Period > &duration) noexcept</td></tr>
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template<class... Args, class Clock , class Duration > </td></tr>
<tr class="memitem:ad2703814c7599d2081ca10763bbeba4a"><td class="memTemplItemLeft" align="right" valign="top">bool </td><td class="memTemplItemRight" valign="bottom"><b>try_link_until</b> (Args &&... args, const std::chrono::time_point< Clock, Duration > &timeout) noexcept</td></tr>
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<tr class="memitem:a1dd7923bb65456af4da41ebe7cb84982"><td class="memItemLeft" align="right" valign="top">virtual result< void > </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1fs__handle.html#a1dd7923bb65456af4da41ebe7cb84982">unlink</a> (<a class="el" href="structllfio__v2__xxx_1_1deadline.html">deadline</a> d=std::chrono::seconds(30)) noexcept</td></tr>
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<tr class="memitem:a7f77a249baf4e0c5de2172669a7724d7"><td class="memTemplParams" colspan="2"><a id="a7f77a249baf4e0c5de2172669a7724d7"></a>
template<class... Args> </td></tr>
<tr class="memitem:a7f77a249baf4e0c5de2172669a7724d7"><td class="memTemplItemLeft" align="right" valign="top">bool </td><td class="memTemplItemRight" valign="bottom"><b>try_unlink</b> (Args &&... args) noexcept</td></tr>
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<tr class="memitem:a209de025a2d3e202a61c50b52d43f2af"><td class="memTemplParams" colspan="2"><a id="a209de025a2d3e202a61c50b52d43f2af"></a>
template<class... Args, class Rep , class Period > </td></tr>
<tr class="memitem:a209de025a2d3e202a61c50b52d43f2af"><td class="memTemplItemLeft" align="right" valign="top">bool </td><td class="memTemplItemRight" valign="bottom"><b>try_unlink_for</b> (Args &&... args, const std::chrono::duration< Rep, Period > &duration) noexcept</td></tr>
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<tr class="memitem:ae9c4133fef23811abcb01e1faf2b19d3"><td class="memTemplParams" colspan="2"><a id="ae9c4133fef23811abcb01e1faf2b19d3"></a>
template<class... Args, class Clock , class Duration > </td></tr>
<tr class="memitem:ae9c4133fef23811abcb01e1faf2b19d3"><td class="memTemplItemLeft" align="right" valign="top">bool </td><td class="memTemplItemRight" valign="bottom"><b>try_unlink_until</b> (Args &&... args, const std::chrono::time_point< Clock, Duration > &timeout) noexcept</td></tr>
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</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-static-methods"></a>
Static Public Member Functions</h2></td></tr>
<tr class="memitem:a1acc9714116df8fbb0651d912a870495"><td class="memItemLeft" align="right" valign="top">static result< <a class="el" href="classllfio__v2__xxx_1_1directory__handle.html">directory_handle</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1directory__handle.html#a1acc9714116df8fbb0651d912a870495">directory</a> (const <a class="el" href="classllfio__v2__xxx_1_1path__handle.html">path_handle</a> &base, <a class="el" href="classllfio__v2__xxx_1_1path__view.html">path_view_type</a> <a class="el" href="classllfio__v2__xxx_1_1path__handle.html#a579c3752604c65325d16a6f8c818c6ab">path</a>, <a class="el" href="classllfio__v2__xxx_1_1handle.html#aa3930273a2d4cabbac309e0b75701dca">mode</a> _mode=<a class="el" href="classllfio__v2__xxx_1_1handle.html#aa3930273a2d4cabbac309e0b75701dcaaecae13117d6f0584c25a9da6c8f8415e">mode::read</a>, <a class="el" href="classllfio__v2__xxx_1_1handle.html#af0b352d0f273ba6fa70c178b2c2fee42">creation</a> _creation=<a class="el" href="classllfio__v2__xxx_1_1handle.html#af0b352d0f273ba6fa70c178b2c2fee42aa200dcd6176417e93be2405188ae7cc9">creation::open_existing</a>, <a class="el" href="classllfio__v2__xxx_1_1handle.html#aecd3a7db6cee3aec07d32fe6f99e6852">caching</a> _caching=<a class="el" href="classllfio__v2__xxx_1_1handle.html#aecd3a7db6cee3aec07d32fe6f99e6852aa181a603769c1f98ad927e7367c7aa51">caching::all</a>, flag <a class="el" href="classllfio__v2__xxx_1_1handle.html#a013936bc1254b1a47567fe29698d1b1c">flags</a>=flag::none) noexcept</td></tr>
<tr class="separator:a1acc9714116df8fbb0651d912a870495"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a6475175eca973ecb66c0cfb118ca1091"><td class="memItemLeft" align="right" valign="top">static result< <a class="el" href="classllfio__v2__xxx_1_1directory__handle.html">directory_handle</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1directory__handle.html#a6475175eca973ecb66c0cfb118ca1091">uniquely_named_directory</a> (const <a class="el" href="classllfio__v2__xxx_1_1path__handle.html">path_handle</a> &dirpath, <a class="el" href="classllfio__v2__xxx_1_1handle.html#aa3930273a2d4cabbac309e0b75701dca">mode</a> _mode=<a class="el" href="classllfio__v2__xxx_1_1handle.html#aa3930273a2d4cabbac309e0b75701dcaaefb2a684e4afb7d55e6147fbe5a332ee">mode::write</a>, <a class="el" href="classllfio__v2__xxx_1_1handle.html#aecd3a7db6cee3aec07d32fe6f99e6852">caching</a> _caching=<a class="el" href="classllfio__v2__xxx_1_1handle.html#aecd3a7db6cee3aec07d32fe6f99e6852ad5197d93c063a2b1e22d1630a39b7aef">caching::temporary</a>, flag <a class="el" href="classllfio__v2__xxx_1_1handle.html#a013936bc1254b1a47567fe29698d1b1c">flags</a>=flag::none) noexcept</td></tr>
<tr class="separator:a6475175eca973ecb66c0cfb118ca1091"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a3513e9a84f1bc13bb4500dbab84207c4"><td class="memItemLeft" align="right" valign="top">static result< <a class="el" href="classllfio__v2__xxx_1_1directory__handle.html">directory_handle</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1directory__handle.html#a3513e9a84f1bc13bb4500dbab84207c4">temp_directory</a> (<a class="el" href="classllfio__v2__xxx_1_1path__view.html">path_view_type</a> name=<a class="el" href="classllfio__v2__xxx_1_1path__view.html">path_view_type</a>(), <a class="el" href="classllfio__v2__xxx_1_1handle.html#aa3930273a2d4cabbac309e0b75701dca">mode</a> _mode=<a class="el" href="classllfio__v2__xxx_1_1handle.html#aa3930273a2d4cabbac309e0b75701dcaaefb2a684e4afb7d55e6147fbe5a332ee">mode::write</a>, <a class="el" href="classllfio__v2__xxx_1_1handle.html#af0b352d0f273ba6fa70c178b2c2fee42">creation</a> _creation=<a class="el" href="classllfio__v2__xxx_1_1handle.html#af0b352d0f273ba6fa70c178b2c2fee42a8f0339e854eb5321306a443ce9199e1d">creation::if_needed</a>, <a class="el" href="classllfio__v2__xxx_1_1handle.html#aecd3a7db6cee3aec07d32fe6f99e6852">caching</a> _caching=<a class="el" href="classllfio__v2__xxx_1_1handle.html#aecd3a7db6cee3aec07d32fe6f99e6852aa181a603769c1f98ad927e7367c7aa51">caching::all</a>, flag <a class="el" href="classllfio__v2__xxx_1_1handle.html#a013936bc1254b1a47567fe29698d1b1c">flags</a>=flag::none) noexcept</td></tr>
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<tr class="memitem:ad9352e3a23b30b446b22933df9ab9623"><td class="memItemLeft" align="right" valign="top"><a id="ad9352e3a23b30b446b22933df9ab9623"></a>
static result< bool > </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1path__handle.html#ad9352e3a23b30b446b22933df9ab9623">exists</a> (const <a class="el" href="classllfio__v2__xxx_1_1path__handle.html">path_handle</a> &base, <a class="el" href="classllfio__v2__xxx_1_1path__view.html">path_view_type</a> <a class="el" href="classllfio__v2__xxx_1_1path__handle.html#a579c3752604c65325d16a6f8c818c6ab">path</a>) noexcept</td></tr>
<tr class="memdesc:ad9352e3a23b30b446b22933df9ab9623"><td class="mdescLeft"> </td><td class="mdescRight">This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. <br /></td></tr>
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<tr class="memitem:a579c3752604c65325d16a6f8c818c6ab"><td class="memItemLeft" align="right" valign="top">static result< <a class="el" href="classllfio__v2__xxx_1_1path__handle.html">path_handle</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1path__handle.html#a579c3752604c65325d16a6f8c818c6ab">path</a> (const <a class="el" href="classllfio__v2__xxx_1_1path__handle.html">path_handle</a> &base, <a class="el" href="classllfio__v2__xxx_1_1path__view.html">path_view_type</a> path) noexcept</td></tr>
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<tr class="memitem:a464c3dfe19b544dfcb0527d83407026b"><td class="memItemLeft" align="right" valign="top"><a id="a464c3dfe19b544dfcb0527d83407026b"></a>
static result< <a class="el" href="classllfio__v2__xxx_1_1path__handle.html">path_handle</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1path__handle.html#a464c3dfe19b544dfcb0527d83407026b">path</a> (<a class="el" href="classllfio__v2__xxx_1_1path__view.html">path_view_type</a> _path) noexcept</td></tr>
<tr class="memdesc:a464c3dfe19b544dfcb0527d83407026b"><td class="mdescLeft"> </td><td class="mdescRight">This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. <br /></td></tr>
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</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pro-methods"></a>
Protected Member Functions</h2></td></tr>
<tr class="memitem:adc2b24484565bcb0cf654adf2f732f7e"><td class="memItemLeft" align="right" valign="top"><a id="adc2b24484565bcb0cf654adf2f732f7e"></a>
result< void > </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1fs__handle.html#adc2b24484565bcb0cf654adf2f732f7e">_fetch_inode</a> () const noexcept</td></tr>
<tr class="memdesc:adc2b24484565bcb0cf654adf2f732f7e"><td class="mdescLeft"> </td><td class="mdescRight">Fill in _devid and _inode from the handle via fstat() <br /></td></tr>
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</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pro-static-methods"></a>
Static Protected Member Functions</h2></td></tr>
<tr class="memitem:a1dd1abc0bd1fa1f10782301dddf802b7"><td class="memItemLeft" align="right" valign="top"><a id="a1dd1abc0bd1fa1f10782301dddf802b7"></a>
static constexpr void </td><td class="memItemRight" valign="bottom"><b>_set_caching</b> (<a class="el" href="structllfio__v2__xxx_1_1native__handle__type.html">native_handle_type</a> &nativeh, <a class="el" href="classllfio__v2__xxx_1_1handle.html#aecd3a7db6cee3aec07d32fe6f99e6852">caching</a> <a class="el" href="classllfio__v2__xxx_1_1handle.html#aecd3a7db6cee3aec07d32fe6f99e6852">caching</a>) noexcept</td></tr>
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</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pro-attribs"></a>
Protected Attributes</h2></td></tr>
<tr class="memitem:a1d6911771ac743fd9d64063c12429deb"><td class="memItemLeft" align="right" valign="top"><a id="a1d6911771ac743fd9d64063c12429deb"></a>
<a class="el" href="structllfio__v2__xxx_1_1native__handle__type.html">native_handle_type</a> </td><td class="memItemRight" valign="bottom"><b>_v</b></td></tr>
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flag </td><td class="memItemRight" valign="bottom"><b>_flags</b> {flag::none}</td></tr>
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dev_t </td><td class="memItemRight" valign="bottom"><b>_devid</b> {0}</td></tr>
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ino_t </td><td class="memItemRight" valign="bottom"><b>_inode</b> {0}</td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>A handle to a directory which can be enumerated. </p>
<dl class="section note"><dt>Note</dt><dd>For good performance, make sure you reuse <code>buffers_type</code> across calls to <code>read()</code>, including across different instances of <code>directory_handle</code>. This is because a kernel buffer is allocated within the first use of a <code>buffers_type</code> in a <code>read()</code>, so reusing <code>buffers_type</code> will save on an allocation-free cycle per directory enumeration. </dd></dl>
</div><h2 class="groupheader">Member Enumeration Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#a54d63e0972dee77ef1f0ff14bd4f9207">◆ </a></span>filter</h2>
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<td class="memname">enum <a class="el" href="classllfio__v2__xxx_1_1directory__handle.html#a54d63e0972dee77ef1f0ff14bd4f9207">llfio_v2_xxx::directory_handle::filter</a></td>
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<p>How to do deleted file elimination on Windows. </p>
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<tr><th colspan="2">Enumerator</th></tr><tr><td class="fieldname"><a id="a54d63e0972dee77ef1f0ff14bd4f9207a334c4a4c42fdb79d7ebc3e73b517e6f8"></a>none </td><td class="fielddoc"><p>Do no filtering at all. </p>
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<tr><td class="fieldname"><a id="a54d63e0972dee77ef1f0ff14bd4f9207a14847befc159c1492671b53718fc46f8"></a>fastdeleted </td><td class="fielddoc"><p>For Windows without POSIX delete semantics, filter out LLFIO deleted files based on their filename (fast and fairly reliable) </p>
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<div class="fragment"><div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  {</div>
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  none, <span class="comment">//!< Do no filtering at all</span></div>
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span> <span class="comment"></span> fastdeleted <span class="comment">//!< For Windows without POSIX delete semantics, filter out LLFIO deleted files based on their filename (fast and fairly reliable)</span></div>
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span> <span class="comment"></span> };</div>
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<h2 class="groupheader">Member Function Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#aeea4389189021b94dde6d8f2c3ccc5b3">◆ </a></span>clone()</h2>
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<td class="memname">result<<a class="el" href="classllfio__v2__xxx_1_1handle.html">handle</a>> llfio_v2_xxx::handle::clone </td>
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<p>Clone this handle (copy constructor is disabled to avoid accidental copying)</p>
<dl class="section user"><dt>Errors returnable\n Any of the values POSIX dup() or DuplicateHandle() can return.</dt><dd></dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#aa0b7dc541e6188fed2950444089fed6c">◆ </a></span>clone_to_path_handle()</h2>
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<td class="memname">result<<a class="el" href="classllfio__v2__xxx_1_1path__handle.html">path_handle</a>> llfio_v2_xxx::directory_handle::clone_to_path_handle </td>
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<p>Return a copy of this directory handle, but as a path handle.</p>
<dl class="section user"><dt>Errors returnable\n Any of the values POSIX dup() or DuplicateHandle() can return.</dt><dd></dd></dl>
<dl class="section user"><dt>Memory Allocations\n On POSIX, we must loop calling current_path() and</dt><dd>trying to open the path returned. Thus many allocations may occur. </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#a00a85eec5a41f7edb2c574d40cf04535">◆ </a></span>current_path()</h2>
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<td class="memname">virtual result<path_type> llfio_v2_xxx::handle::current_path </td>
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<p>Returns the current path of the open handle as said by the operating system. Note that you are NOT guaranteed that any path refreshed bears any resemblance to the original, some operating systems will return some different path which still reaches the same inode via some other route e.g. hardlinks, dereferenced symbolic links, etc. Windows and Linux correctly track changes to the specific path the handle was opened with, not getting confused by other hard links. MacOS nearly gets it right, but under some circumstances e.g. renaming may switch to a different hard link's path which is almost certainly a bug.</p>
<p>If LLFIO was not able to determine the current path for this open handle e.g. the inode has been unlinked, it returns an empty path. Be aware that FreeBSD can return an empty (deleted) path for file inodes no longer cached by the kernel path cache, LLFIO cannot detect the difference. FreeBSD will also return any path leading to the inode if it is hard linked. FreeBSD does implement path retrieval for directory inodes correctly however, and see <code>algorithm::cached_parent_handle_adapter<T></code> for a handle adapter which makes use of that.</p>
<p>On Linux if <code>/proc</code> is not mounted, this call fails with an error. All APIs in LLFIO which require the use of <code>current_path()</code> can be told to not use it e.g. <code>flag::disable_safety_unlinks</code>. It is up to you to detect if <code>current_path()</code> is not working, and to change how you call LLFIO appropriately.</p>
<p>On Windows, you will almost certainly get back a path of the form <code>\!!\Device\HarddiskVolume10\Users\ned\...</code>. See <code>path_view</code> for what all the path prefix sequences mean, but to summarise the <code>\!!\</code> prefix is LLFIO-only and will not be accepted by other Windows APIs. Pass LLFIO derived paths through the function <code>to_win32_path()</code> to Win32-ise them. This function is also available on Linux where it does nothing, so you can use it in portable code.</p>
<dl class="section warning"><dt>Warning</dt><dd>This call is expensive, it always asks the kernel for the current path, and no checking is done to ensure what the kernel returns is accurate or even sensible. Be aware that despite these precautions, paths are unstable and <b>can change randomly at any moment</b>. Most code written to use absolute file systems paths is <b>racy</b>, so don't do it, use <code>path_handle</code> to fix a base location on the file system and work from that anchor instead!</dd></dl>
<dl class="section user"><dt>Memory Allocations\n At least one malloc for the path_type, likely several more.</dt><dd></dd></dl>
<dl class="section see"><dt>See also</dt><dd><code>algorithm::cached_parent_handle_adapter<T></code> which overrides this with an implementation based on retrieving the current path of a cached handle to the parent directory. On platforms with instability or failure to retrieve the correct current path for regular files, the cached parent handle adapter works around the problem by taking advantage of directory inodes not having the same instability problems on any platform. </dd></dl>
<p>Reimplemented in <a class="el" href="classllfio__v2__xxx_1_1symlink__handle.html#aea44ed050acfd8e4f9dec59ff194c746">llfio_v2_xxx::symlink_handle</a>, and <a class="el" href="classllfio__v2__xxx_1_1process__handle.html#a8ed1f5dda9dcf9d59710acc9c91df943">llfio_v2_xxx::process_handle</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a1acc9714116df8fbb0651d912a870495">◆ </a></span>directory()</h2>
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<td class="memname">static result<<a class="el" href="classllfio__v2__xxx_1_1directory__handle.html">directory_handle</a>> llfio_v2_xxx::directory_handle::directory </td>
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<td class="paramtype">const <a class="el" href="classllfio__v2__xxx_1_1path__handle.html">path_handle</a> & </td>
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<td class="paramtype"><a class="el" href="classllfio__v2__xxx_1_1handle.html#aa3930273a2d4cabbac309e0b75701dca">mode</a> </td>
<td class="paramname"><em>_mode</em> = <code><a class="el" href="classllfio__v2__xxx_1_1handle.html#aa3930273a2d4cabbac309e0b75701dcaaecae13117d6f0584c25a9da6c8f8415e">mode::read</a></code>, </td>
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<td class="paramname"><em>_creation</em> = <code><a class="el" href="classllfio__v2__xxx_1_1handle.html#af0b352d0f273ba6fa70c178b2c2fee42aa200dcd6176417e93be2405188ae7cc9">creation::open_existing</a></code>, </td>
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<td class="paramtype"><a class="el" href="classllfio__v2__xxx_1_1handle.html#aecd3a7db6cee3aec07d32fe6f99e6852">caching</a> </td>
<td class="paramname"><em>_caching</em> = <code><a class="el" href="classllfio__v2__xxx_1_1handle.html#aecd3a7db6cee3aec07d32fe6f99e6852aa181a603769c1f98ad927e7367c7aa51">caching::all</a></code>, </td>
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<p>Create a handle opening access to a directory on path.</p>
<dl class="section user"><dt>Errors returnable\n Any of the values POSIX open() or CreateFile() can return.</dt><dd></dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#a03229b163152b540c3eb6edd41cf5d32">◆ </a></span>exists()</h2>
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<td class="memname">result<bool> llfio_v2_xxx::path_handle::exists </td>
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<td class="paramname"><em>path</em></td><td>)</td>
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<p>Returns whether a file entry exists more efficiently that opening and closing a <code>file_handle</code>. Note that this can be a rich source of TOCTOU security attacks! Be aware that symbolic links are NOT dereferenced, so a subsequent file handle open may fail. </p>
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<td class="memname">virtual result<void> llfio_v2_xxx::fs_handle::link </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="classllfio__v2__xxx_1_1path__handle.html">path_handle</a> & </td>
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<p>Links the inode referred to by this open handle to the path specified. The current path of this open handle is not changed, unless it has no current path due to being unlinked.</p>
<dl class="section warning"><dt>Warning</dt><dd>Some operating systems provide a race free syscall for linking an open handle to a new location (Linux, Windows). On all other operating systems this call is <b>racy</b> and can result in the wrong inode being linked. Note that unless <code>flag::disable_safety_unlinks</code> is set, this implementation opens a <code>path_handle</code> to the source containing directory first, then checks before linking that the item about to be hard linked has the same inode as the open file handle. It will retry this matching until success until the deadline given. This should prevent most unmalicious accidental loss of data.</dd></dl>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">base</td><td>Base for any relative path. </td></tr>
<tr><td class="paramname">path</td><td>The relative or absolute new path to hard link to. </td></tr>
<tr><td class="paramname">d</td><td>The deadline by which the matching of the containing directory to the open handle's inode must succeed, else <code>errc::timed_out</code> will be returned. </td></tr>
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<dl class="section user"><dt>Memory Allocations\n Except on platforms with race free syscalls for renaming open handles (Windows), calls</dt><dd><code>current_path()</code> via <code>parent_path_handle()</code> and thus is both expensive and calls malloc many times. </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#a865caad2f7f4bdf12fb74aabfe3c5ff5">◆ </a></span>parent_path_handle()</h2>
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<td class="memname">virtual result<<a class="el" href="classllfio__v2__xxx_1_1path__handle.html">path_handle</a>> llfio_v2_xxx::fs_handle::parent_path_handle </td>
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<p>Obtain a handle to the path <b>currently</b> containing this handle's file entry.</p>
<dl class="section warning"><dt>Warning</dt><dd>This call is <b>racy</b> and can result in the wrong path handle being returned. Note that unless <code>flag::disable_safety_unlinks</code> is set, this implementation opens a <code>path_handle</code> to the source containing directory, then checks if the file entry within has the same inode as the open file handle. It will retry this matching until success until the deadline given.</dd></dl>
<dl class="section user"><dt>Memory Allocations\n Calls current_path() and thus is both expensive and calls malloc many times.</dt><dd></dd></dl>
<dl class="section see"><dt>See also</dt><dd><code>algorithm::cached_parent_handle_adapter<T></code> which overrides this with a zero cost implementation, thus making unlinking and relinking very considerably quicker. </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#a579c3752604c65325d16a6f8c818c6ab">◆ </a></span>path()</h2>
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<td class="memname">static result<<a class="el" href="classllfio__v2__xxx_1_1path__handle.html">path_handle</a>> llfio_v2_xxx::path_handle::path </td>
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<p>Create a path handle opening access to some location on the filing system. Some operating systems provide a particularly lightweight method of doing this (Linux: <code>O_PATH</code>, Windows: no access perms) which is much faster than opening a directory. For other systems, we open a directory with read only permissions.</p>
<dl class="section user"><dt>Errors returnable\n Any of the values POSIX open() or CreateFile() can return.</dt><dd></dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#ac5222904f116c9beb0515a4a5aa850bf">◆ </a></span>QUICKCPPLIB_BITFIELD_BEGIN()</h2>
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<td class="memname">llfio_v2_xxx::handle::QUICKCPPLIB_BITFIELD_BEGIN </td>
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<p>Bitwise flags which can be specified. </p>
<p>< No flags</p>
<p>Unlinks the file on handle close. On POSIX, this simply unlinks whatever is pointed to by <code>path()</code> upon the call of <code>close()</code> if and only if the inode matches. On Windows, if you are on Windows 10 1709 or later, exactly the same thing occurs. If on previous editions of Windows, the file entry does not disappears but becomes unavailable for anyone else to open with an <code>errc::resource_unavailable_try_again</code> error return. Because this is confusing, unless the <code>win_disable_unlink_emulation</code> flag is also specified, this POSIX behaviour is somewhat emulated by LLFIO on older Windows by renaming the file to a random name on <code>close()</code> causing it to appear to have been unlinked immediately.</p>
<p>Some kernel caching modes have unhelpfully inconsistent behaviours in getting your data onto storage, so by default unless this flag is specified LLFIO adds extra fsyncs to the following operations for the caching modes specified below: truncation of file length either explicitly or during file open. closing of the handle either explicitly or in the destructor.</p>
<p>Additionally on Linux only to prevent loss of file metadata: On the parent directory whenever a file might have been created. On the parent directory on file close.</p>
<p>This only occurs for these kernel caching modes: caching::none caching::reads caching::reads_and_metadata caching::safety_barriers</p>
<p><code>file_handle::unlink()</code> could accidentally delete the wrong file if someone has renamed the open file handle since the time it was opened. To prevent this occuring, where the OS doesn't provide race free unlink-by-open-handle we compare the inode of the path we are about to unlink with that of the open handle before unlinking. </p><dl class="section warning"><dt>Warning</dt><dd>This does not prevent races where in between the time of checking the inode and executing the unlink a third party changes the item about to be unlinked. Only operating systems with a true race-free unlink syscall are race free.</dd></dl>
<p>Ask the OS to disable prefetching of data. This can improve random i/o performance.</p>
<p>Ask the OS to maximise prefetching of data, possibly prefetching the entire file into kernel cache. This can improve sequential i/o performance.</p>
<p>< See the documentation for <code>unlink_on_first_close</code></p>
<p>Microsoft Windows NTFS, having been created in the late 1980s, did not originally implement extents-based storage and thus could only represent sparse files via efficient compression of intermediate zeros. With NTFS v3.0 (Microsoft Windows 2000), a proper extents-based on-storage representation was added, thus allowing only 64Kb extent chunks written to be stored irrespective of whatever the maximum file extent was set to.</p>
<p>For various historical reasons, extents-based storage is disabled by default in newly created files on NTFS, unlike in almost every other major filing system. You have to explicitly "opt in" to extents-based storage.</p>
<p>As extents-based storage is nearly cost free on NTFS, LLFIO by default opts in to extents-based storage for any empty file it creates. If you don't want this, you can specify this flag to prevent that happening.</p>
<p>Filesystems tend to be embarrassingly parallel for operations performed to different inodes. Where LLFIO performs i/o to multiple inodes at a time, it will use OpenMP or the Parallelism or Concurrency standard library extensions to usually complete the operation in constant rather than linear time. If you don't want this default, you can disable default using this flag.</p>
<p>Microsoft Windows NTFS has the option, when creating a directory, to set whether leafname lookup will be case sensitive. This is the only way of getting exact POSIX semantics on Windows without resorting to editing the system registry, however it also affects all code doing lookups within that directory, so we must default it to off.</p>
<p>Create the handle in a way where i/o upon it can be multiplexed with other i/o on the same initiating thread of execution i.e. you can perform more than one read concurrently, without using threads. The blocking operations <code>.read()</code> and <code>.write()</code> may have to use a less efficient, but cancellable, blocking implementation for handles created in this way. On Microsoft Windows, this creates handles with <code>OVERLAPPED</code> semantics. On POSIX, this creates handles with nonblocking semantics for non-file handles such as pipes and sockets, however for file, directory and symlink handles it does not set nonblocking, as it is non-portable.</p>
<p>< Using insane POSIX byte range locks</p>
<p>< This is an inode created with no representation on the filing system</p>
<div class="fragment"><div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  {</div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  none = 0, <span class="comment">//!< No flags</span></div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span> <span class="comment"></span><span class="comment"> /*! Unlinks the file on handle close. On POSIX, this simply unlinks whatever is pointed</span></div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span> <span class="comment"> to by `path()` upon the call of `close()` if and only if the inode matches. On Windows,</span></div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span> <span class="comment"> if you are on Windows 10 1709 or later, exactly the same thing occurs. If on previous</span></div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span> <span class="comment"> editions of Windows, the file entry does not disappears but becomes unavailable for</span></div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span> <span class="comment"> anyone else to open with an `errc::resource_unavailable_try_again` error return. Because this is confusing, unless the</span></div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span> <span class="comment"> `win_disable_unlink_emulation` flag is also specified, this POSIX behaviour is</span></div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span> <span class="comment"> somewhat emulated by LLFIO on older Windows by renaming the file to a random name on `close()`</span></div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span> <span class="comment"> causing it to appear to have been unlinked immediately.</span></div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  unlink_on_first_close = 1U << 0U,</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span> <span class="comment"></span> </div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span> <span class="comment"> /*! Some kernel caching modes have unhelpfully inconsistent behaviours</span></div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span> <span class="comment"> in getting your data onto storage, so by default unless this flag is</span></div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span> <span class="comment"> specified LLFIO adds extra fsyncs to the following operations for the</span></div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span> <span class="comment"> caching modes specified below:</span></div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span> <span class="comment"> * truncation of file length either explicitly or during file open.</span></div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span> <span class="comment"> * closing of the handle either explicitly or in the destructor.</span></div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span> <span class="comment"></span> </div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span> <span class="comment"> Additionally on Linux only to prevent loss of file metadata:</span></div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span> <span class="comment"> * On the parent directory whenever a file might have been created.</span></div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span> <span class="comment"> * On the parent directory on file close.</span></div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span> <span class="comment"></span> </div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span> <span class="comment"> This only occurs for these kernel caching modes:</span></div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span> <span class="comment"> * caching::none</span></div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span> <span class="comment"> * caching::reads</span></div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span> <span class="comment"> * caching::reads_and_metadata</span></div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span> <span class="comment"> * caching::safety_barriers</span></div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  disable_safety_barriers = 1U << 2U,<span class="comment"></span></div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span> <span class="comment"> /*! `file_handle::unlink()` could accidentally delete the wrong file if someone has</span></div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span> <span class="comment"> renamed the open file handle since the time it was opened. To prevent this occuring,</span></div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span> <span class="comment"> where the OS doesn't provide race free unlink-by-open-handle we compare the inode of</span></div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span> <span class="comment"> the path we are about to unlink with that of the open handle before unlinking.</span></div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span> <span class="comment"> \warning This does not prevent races where in between the time of checking the inode</span></div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span> <span class="comment"> and executing the unlink a third party changes the item about to be unlinked. Only</span></div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span> <span class="comment"> operating systems with a true race-free unlink syscall are race free.</span></div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  disable_safety_unlinks = 1U << 3U,<span class="comment"></span></div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span> <span class="comment"> /*! Ask the OS to disable prefetching of data. This can improve random</span></div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span> <span class="comment"> i/o performance.</span></div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  disable_prefetching = 1U << 4U,<span class="comment"></span></div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span> <span class="comment"> /*! Ask the OS to maximise prefetching of data, possibly prefetching the entire file</span></div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span> <span class="comment"> into kernel cache. This can improve sequential i/o performance.</span></div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  maximum_prefetching = 1U << 5U,</div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  </div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  win_disable_unlink_emulation = 1U << 24U, <span class="comment">//!< See the documentation for `unlink_on_first_close`</span></div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span> <span class="comment"></span><span class="comment"> /*! Microsoft Windows NTFS, having been created in the late 1980s, did not originally</span></div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span> <span class="comment"> implement extents-based storage and thus could only represent sparse files via</span></div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span> <span class="comment"> efficient compression of intermediate zeros. With NTFS v3.0 (Microsoft Windows 2000),</span></div>
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span> <span class="comment"> a proper extents-based on-storage representation was added, thus allowing only 64Kb</span></div>
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span> <span class="comment"> extent chunks written to be stored irrespective of whatever the maximum file extent</span></div>
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span> <span class="comment"> was set to.</span></div>
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span> <span class="comment"></span> </div>
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span> <span class="comment"> For various historical reasons, extents-based storage is disabled by default in newly</span></div>
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span> <span class="comment"> created files on NTFS, unlike in almost every other major filing system. You have to</span></div>
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span> <span class="comment"> explicitly "opt in" to extents-based storage.</span></div>
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span> <span class="comment"></span> </div>
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span> <span class="comment"> As extents-based storage is nearly cost free on NTFS, LLFIO by default opts in to</span></div>
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span> <span class="comment"> extents-based storage for any empty file it creates. If you don't want this, you</span></div>
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span> <span class="comment"> can specify this flag to prevent that happening.</span></div>
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  win_disable_sparse_file_creation = 1U << 25U,<span class="comment"></span></div>
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span> <span class="comment"> /*! Filesystems tend to be embarrassingly parallel for operations performed to different</span></div>
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span> <span class="comment"> inodes. Where LLFIO performs i/o to multiple inodes at a time, it will use OpenMP or</span></div>
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span> <span class="comment"> the Parallelism or Concurrency standard library extensions to usually complete the</span></div>
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span> <span class="comment"> operation in constant rather than linear time. If you don't want this default, you can</span></div>
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span> <span class="comment"> disable default using this flag.</span></div>
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  disable_parallelism = 1U << 26U,<span class="comment"></span></div>
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span> <span class="comment"> /*! Microsoft Windows NTFS has the option, when creating a directory, to set whether</span></div>
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span> <span class="comment"> leafname lookup will be case sensitive. This is the only way of getting exact POSIX</span></div>
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span> <span class="comment"> semantics on Windows without resorting to editing the system registry, however it also</span></div>
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span> <span class="comment"> affects all code doing lookups within that directory, so we must default it to off.</span></div>
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  win_create_case_sensitive_directory = 1U << 27U,</div>
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span> <span class="comment"></span> </div>
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span> <span class="comment"> /*! Create the handle in a way where i/o upon it can be multiplexed with other i/o</span></div>
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span> <span class="comment"> on the same initiating thread of execution i.e. you can perform more than one read</span></div>
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span> <span class="comment"> concurrently, without using threads. The blocking operations `.read()` and `.write()`</span></div>
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span> <span class="comment"> may have to use a less efficient, but cancellable, blocking implementation for handles created</span></div>
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span> <span class="comment"> in this way. On Microsoft Windows, this creates handles with `OVERLAPPED` semantics.</span></div>
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span> <span class="comment"> On POSIX, this creates handles with nonblocking semantics for non-file handles such</span></div>
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span> <span class="comment"> as pipes and sockets, however for file, directory and symlink handles it does not set</span></div>
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span> <span class="comment"> nonblocking, as it is non-portable.</span></div>
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span>  multiplexable = 1U << 28U,</div>
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  </div>
<div class="line"><a name="l00192"></a><span class="lineno"> 192</span>  <span class="comment">// NOTE: IF UPDATING THIS UPDATE THE std::ostream PRINTER BELOW!!!</span></div>
<div class="line"><a name="l00193"></a><span class="lineno"> 193</span>  </div>
<div class="line"><a name="l00194"></a><span class="lineno"> 194</span>  byte_lock_insanity = 1U << 29U, <span class="comment">//!< Using insane POSIX byte range locks</span></div>
<div class="line"><a name="l00195"></a><span class="lineno"> 195</span> <span class="comment"></span> anonymous_inode = 1U << 30U <span class="comment">//!< This is an inode created with no representation on the filing system</span></div>
<div class="line"><a name="l00196"></a><span class="lineno"> 196</span> <span class="comment"></span> } QUICKCPPLIB_BITFIELD_END(flag);</div>
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<h2 class="memtitle"><span class="permalink"><a href="#ab27aadf3740715dc8c5d7cd5a194d57e">◆ </a></span>read()</h2>
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<td class="memname">virtual result<<a class="el" href="structllfio__v2__xxx_1_1directory__handle_1_1buffers__type.html">buffers_type</a>> llfio_v2_xxx::directory_handle::read </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structllfio__v2__xxx_1_1directory__handle_1_1io__request.html">io_request</a>< <a class="el" href="structllfio__v2__xxx_1_1directory__handle_1_1buffers__type.html">buffers_type</a> > </td>
<td class="paramname"><em>req</em>, </td>
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<td class="paramtype"><a class="el" href="structllfio__v2__xxx_1_1deadline.html">deadline</a> </td>
<td class="paramname"><em>d</em> = <code>std::chrono::seconds(30)</code> </td>
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<p>Fill the buffers type with as many directory entries as will fit into any optionally supplied buffer. This operation returns a <b>snapshot</b>, without races, of the directory contents at the moment of the call.</p>
<dl class="section return"><dt>Returns</dt><dd>Returns the buffers filled, what metadata was filled in and whether the entire directory was read or not. You should <em>always</em> examine <code>.metadata()</code> for the metadata you are about to use, fetching it with <code>stat_t::fill()</code> if not yet present. </dd></dl>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">req</td><td>A buffer fill (directory enumeration) request. </td></tr>
</table>
</dd>
</dl>
<dl class="section user"><dt>Errors returnable\n todo</dt><dd></dd></dl>
<dl class="section user"><dt>Memory Allocations\n If the kernelbuffer parameter is set in the request, no memory allocations.</dt><dd>If unset, at least one memory allocation, possibly more is performed. MAKE SURE you reuse the <code>buffers_type</code> across calls once you are no longer using the buffers filled (simply restamp its span range, the internal kernel buffer will then get reused). </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#a8700edc9ecd4dd35d5aad7c65dd0eca2">◆ </a></span>relink()</h2>
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<td class="memname">virtual result<void> llfio_v2_xxx::fs_handle::relink </td>
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<td class="paramtype">const <a class="el" href="classllfio__v2__xxx_1_1path__handle.html">path_handle</a> & </td>
<td class="paramname"><em>base</em>, </td>
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<td class="paramtype"><a class="el" href="classllfio__v2__xxx_1_1fs__handle.html#abcd8c8171f4e561620864295e8d5879b">path_view_type</a> </td>
<td class="paramname"><em>path</em>, </td>
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<td class="paramtype">bool </td>
<td class="paramname"><em>atomic_replace</em> = <code>true</code>, </td>
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<td class="paramtype"><a class="el" href="structllfio__v2__xxx_1_1deadline.html">deadline</a> </td>
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<p>Relinks the current path of this open handle to the new path specified. If <code>atomic_replace</code> is true, the relink <b>atomically</b> and silently replaces any item at the new path specified. This operation is both atomic and matching POSIX behaviour even on Microsoft Windows where no Win32 API can match POSIX semantics.</p>
<p>Note that if <code>atomic_replace</code> is false, the operation <em>may</em> be implemented as creating a hard link to the destination (which fails if the destination exists), opening a new file descriptor to the destination, closing the existing file descriptor, replacing the existing file descriptor with the new one (this is to ensure path tracking continues to work), then unlinking the previous link. Thus <code>native_handle()</code>'s value <em>may</em> change. This is not the case on Microsoft Windows nor Linux, both of which provide syscalls capable of refusing to rename if the destination exists.</p>
<p>If the handle refers to a pipe, on Microsoft Windows the base path handle is ignored as there is a single global named pipe namespace. Unless the path fragment begins with <code>\</code>, the string <code>\??\</code> is prefixed to the name before passing it to the NT kernel API which performs the rename. This is because <code>\\.\</code> in Win32 maps onto <code>\??\</code> in the NT kernel.</p>
<dl class="section warning"><dt>Warning</dt><dd>Some operating systems provide a race free syscall for renaming an open handle (Windows). On all other operating systems this call is <b>racy</b> and can result in the wrong file entry being relinked. Note that unless <code>flag::disable_safety_unlinks</code> is set, this implementation opens a <code>path_handle</code> to the source containing directory first, then checks before relinking that the item about to be relinked has the same inode as the open file handle. It will retry this matching until success until the deadline given. This should prevent most unmalicious accidental loss of data.</dd></dl>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">base</td><td>Base for any relative path. </td></tr>
<tr><td class="paramname">path</td><td>The relative or absolute new path to relink to. </td></tr>
<tr><td class="paramname">atomic_replace</td><td>Atomically replace the destination if a file entry already is present there. Choosing false for this will fail if a file entry is already present at the destination, and may not be an atomic operation on some platforms (i.e. both the old and new names may be linked to the same inode for a very short period of time). Windows and recent Linuxes are always atomic. </td></tr>
<tr><td class="paramname">d</td><td>The deadline by which the matching of the containing directory to the open handle's inode must succeed, else <code>errc::timed_out</code> will be returned. </td></tr>
</table>
</dd>
</dl>
<dl class="section user"><dt>Memory Allocations\n Except on platforms with race free syscalls for renaming open handles (Windows), calls</dt><dd><code>current_path()</code> via <code>parent_path_handle()</code> and thus is both expensive and calls malloc many times. </dd></dl>
<p>Reimplemented in <a class="el" href="classllfio__v2__xxx_1_1mapped__file__handle.html#a35d3754438d64a63a7fe63c5ade23a62">llfio_v2_xxx::mapped_file_handle</a>, and <a class="el" href="classllfio__v2__xxx_1_1symlink__handle.html#afea9ef2b36cac3f6dfcae7555ca3303c">llfio_v2_xxx::symlink_handle</a>.</p>
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<a id="ac65718d52cac467dcc1cb814bd91d537"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ac65718d52cac467dcc1cb814bd91d537">◆ </a></span>reopen()</h2>
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<td class="memname">virtual result<<a class="el" href="classllfio__v2__xxx_1_1directory__handle.html">directory_handle</a>> llfio_v2_xxx::directory_handle::reopen </td>
<td>(</td>
<td class="paramtype"><a class="el" href="classllfio__v2__xxx_1_1handle.html#aa3930273a2d4cabbac309e0b75701dca">mode</a> </td>
<td class="paramname"><em>mode_</em> = <code>mode::unchanged</code>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="classllfio__v2__xxx_1_1handle.html#aecd3a7db6cee3aec07d32fe6f99e6852">caching</a> </td>
<td class="paramname"><em>caching_</em> = <code>caching::unchanged</code>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="structllfio__v2__xxx_1_1deadline.html">deadline</a> </td>
<td class="paramname"><em>d</em> = <code>std::chrono::seconds(30)</code> </td>
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<td>)</td>
<td></td><td> const</td>
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<p>Reopen this handle (copy constructor is disabled to avoid accidental copying), optionally race free reopening the handle with different access or caching.</p>
<p>Microsoft Windows provides a syscall for cloning an existing handle but with new access. On POSIX, we must loop calling <code>current_path()</code>, trying to open the path returned and making sure it is the same inode.</p>
<dl class="section user"><dt>Errors returnable\n Any of the values POSIX dup() or DuplicateHandle() can return.</dt><dd></dd></dl>
<dl class="section user"><dt>Memory Allocations\n On POSIX if changing the mode, we must loop calling current_path() and</dt><dd>trying to open the path returned. Thus many allocations may occur. </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#a101620e9fff0c0e8c346af0e9de58b6a">◆ </a></span>set_append_only()</h2>
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<td class="memname">virtual result<void> llfio_v2_xxx::handle::set_append_only </td>
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<td class="paramtype">bool </td>
<td class="paramname"><em>enable</em></td><td>)</td>
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<p>EXTENSION: Changes whether this handle is append only or not. </p>
<dl class="section warning"><dt>Warning</dt><dd>On Windows this is implemented as a bit of a hack to make it fast like on POSIX, so make sure you open the handle for read/write originally. Note unlike on POSIX the append_only disposition will be the only one toggled, seekable and readable will remain turned on.</dd></dl>
<dl class="section user"><dt>Errors returnable\n Whatever POSIX fcntl() returns. On Windows nothing is changed on the handle.</dt><dd></dd></dl>
<dl class="section user"><dt>Memory Allocations\n No memory allocation.</dt><dd></dd></dl>
<p>Reimplemented in <a class="el" href="classllfio__v2__xxx_1_1process__handle.html#ab64c9fc14fc555b5ec8571863458bf83">llfio_v2_xxx::process_handle</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a3513e9a84f1bc13bb4500dbab84207c4">◆ </a></span>temp_directory()</h2>
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<td class="memname">static result<<a class="el" href="classllfio__v2__xxx_1_1directory__handle.html">directory_handle</a>> llfio_v2_xxx::directory_handle::temp_directory </td>
<td>(</td>
<td class="paramtype"><a class="el" href="classllfio__v2__xxx_1_1path__view.html">path_view_type</a> </td>
<td class="paramname"><em>name</em> = <code><a class="el" href="classllfio__v2__xxx_1_1path__view.html">path_view_type</a>()</code>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="classllfio__v2__xxx_1_1handle.html#aa3930273a2d4cabbac309e0b75701dca">mode</a> </td>
<td class="paramname"><em>_mode</em> = <code><a class="el" href="classllfio__v2__xxx_1_1handle.html#aa3930273a2d4cabbac309e0b75701dcaaefb2a684e4afb7d55e6147fbe5a332ee">mode::write</a></code>, </td>
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<td class="paramkey"></td>
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<td class="paramtype"><a class="el" href="classllfio__v2__xxx_1_1handle.html#af0b352d0f273ba6fa70c178b2c2fee42">creation</a> </td>
<td class="paramname"><em>_creation</em> = <code><a class="el" href="classllfio__v2__xxx_1_1handle.html#af0b352d0f273ba6fa70c178b2c2fee42a8f0339e854eb5321306a443ce9199e1d">creation::if_needed</a></code>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="classllfio__v2__xxx_1_1handle.html#aecd3a7db6cee3aec07d32fe6f99e6852">caching</a> </td>
<td class="paramname"><em>_caching</em> = <code><a class="el" href="classllfio__v2__xxx_1_1handle.html#aecd3a7db6cee3aec07d32fe6f99e6852aa181a603769c1f98ad927e7367c7aa51">caching::all</a></code>, </td>
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<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">flag </td>
<td class="paramname"><em>flags</em> = <code>flag::none</code> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
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<span class="mlabels"><span class="mlabel">inline</span><span class="mlabel">static</span><span class="mlabel">noexcept</span></span> </td>
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<p>Create a directory handle creating the named directory on some path which the OS declares to be suitable for temporary files. Note also that an empty name is equivalent to calling <code>uniquely_named_file(path_discovery::storage_backed_temporary_files_directory())</code> and the creation parameter is ignored.</p>
<dl class="section user"><dt>Errors returnable\n Any of the values POSIX open() or CreateFile() can return.</dt><dd></dd></dl>
<div class="fragment"><div class="line"><a name="l00282"></a><span class="lineno"> 282</span>  {</div>
<div class="line"><a name="l00283"></a><span class="lineno"> 283</span>  <span class="keyword">auto</span> &tempdirh = <a class="code" href="namespacellfio__v2__xxx_1_1path__discovery.html#a2dd74ea752f3f511d58ccccdcac7f4fd">path_discovery::storage_backed_temporary_files_directory</a>();</div>
<div class="line"><a name="l00284"></a><span class="lineno"> 284</span>  <span class="keywordflow">return</span> name.empty() ? <a class="code" href="classllfio__v2__xxx_1_1directory__handle.html#a6475175eca973ecb66c0cfb118ca1091">uniquely_named_directory</a>(tempdirh, _mode, _caching, <a class="code" href="classllfio__v2__xxx_1_1handle.html#a013936bc1254b1a47567fe29698d1b1c">flags</a>) : <a class="code" href="classllfio__v2__xxx_1_1directory__handle.html#a1acc9714116df8fbb0651d912a870495">directory</a>(tempdirh, name, _mode, _creation, _caching, <a class="code" href="classllfio__v2__xxx_1_1handle.html#a013936bc1254b1a47567fe29698d1b1c">flags</a>);</div>
<div class="line"><a name="l00285"></a><span class="lineno"> 285</span>  }</div>
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<h2 class="memtitle"><span class="permalink"><a href="#a6475175eca973ecb66c0cfb118ca1091">◆ </a></span>uniquely_named_directory()</h2>
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<td class="memname">static result<<a class="el" href="classllfio__v2__xxx_1_1directory__handle.html">directory_handle</a>> llfio_v2_xxx::directory_handle::uniquely_named_directory </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="classllfio__v2__xxx_1_1path__handle.html">path_handle</a> & </td>
<td class="paramname"><em>dirpath</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="classllfio__v2__xxx_1_1handle.html#aa3930273a2d4cabbac309e0b75701dca">mode</a> </td>
<td class="paramname"><em>_mode</em> = <code><a class="el" href="classllfio__v2__xxx_1_1handle.html#aa3930273a2d4cabbac309e0b75701dcaaefb2a684e4afb7d55e6147fbe5a332ee">mode::write</a></code>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="classllfio__v2__xxx_1_1handle.html#aecd3a7db6cee3aec07d32fe6f99e6852">caching</a> </td>
<td class="paramname"><em>_caching</em> = <code><a class="el" href="classllfio__v2__xxx_1_1handle.html#aecd3a7db6cee3aec07d32fe6f99e6852ad5197d93c063a2b1e22d1630a39b7aef">caching::temporary</a></code>, </td>
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<td class="paramtype">flag </td>
<td class="paramname"><em>flags</em> = <code>flag::none</code> </td>
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<td></td>
<td>)</td>
<td></td><td></td>
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<p>Create a directory handle creating a uniquely named file on a path. The file is opened exclusively with <code>creation::only_if_not_exist</code> so it will never collide with nor overwrite any existing entry.</p>
<dl class="section user"><dt>Errors returnable\n Any of the values POSIX open() or CreateFile() can return.</dt><dd></dd></dl>
<div class="fragment"><div class="line"><a name="l00254"></a><span class="lineno"> 254</span>  {</div>
<div class="line"><a name="l00255"></a><span class="lineno"> 255</span>  <span class="keywordflow">try</span></div>
<div class="line"><a name="l00256"></a><span class="lineno"> 256</span>  {</div>
<div class="line"><a name="l00257"></a><span class="lineno"> 257</span>  <span class="keywordflow">for</span>(;;)</div>
<div class="line"><a name="l00258"></a><span class="lineno"> 258</span>  {</div>
<div class="line"><a name="l00259"></a><span class="lineno"> 259</span>  <span class="keyword">auto</span> randomname = <a class="code" href="namespacellfio__v2__xxx_1_1utils.html#a6a29cf29a4b097411f6c1e5274bfb417">utils::random_string</a>(32);</div>
<div class="line"><a name="l00260"></a><span class="lineno"> 260</span>  result<directory_handle> ret = <a class="code" href="classllfio__v2__xxx_1_1directory__handle.html#a1acc9714116df8fbb0651d912a870495">directory</a>(dirpath, randomname, _mode, <a class="code" href="classllfio__v2__xxx_1_1handle.html#af0b352d0f273ba6fa70c178b2c2fee42abba3bc579480e6c94ecd81b7b5923255">creation::only_if_not_exist</a>, _caching, <a class="code" href="classllfio__v2__xxx_1_1handle.html#a013936bc1254b1a47567fe29698d1b1c">flags</a>);</div>
<div class="line"><a name="l00261"></a><span class="lineno"> 261</span>  <span class="keywordflow">if</span>(ret || (!ret && ret.error() != errc::file_exists))</div>
<div class="line"><a name="l00262"></a><span class="lineno"> 262</span>  {</div>
<div class="line"><a name="l00263"></a><span class="lineno"> 263</span>  <span class="keywordflow">return</span> ret;</div>
<div class="line"><a name="l00264"></a><span class="lineno"> 264</span>  }</div>
<div class="line"><a name="l00265"></a><span class="lineno"> 265</span>  }</div>
<div class="line"><a name="l00266"></a><span class="lineno"> 266</span>  }</div>
<div class="line"><a name="l00267"></a><span class="lineno"> 267</span>  <span class="keywordflow">catch</span>(...)</div>
<div class="line"><a name="l00268"></a><span class="lineno"> 268</span>  {</div>
<div class="line"><a name="l00269"></a><span class="lineno"> 269</span>  <span class="keywordflow">return</span> error_from_exception();</div>
<div class="line"><a name="l00270"></a><span class="lineno"> 270</span>  }</div>
<div class="line"><a name="l00271"></a><span class="lineno"> 271</span>  }</div>
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<h2 class="memtitle"><span class="permalink"><a href="#a1dd7923bb65456af4da41ebe7cb84982">◆ </a></span>unlink()</h2>
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<td class="memname">virtual result<void> llfio_v2_xxx::fs_handle::unlink </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structllfio__v2__xxx_1_1deadline.html">deadline</a> </td>
<td class="paramname"><em>d</em> = <code>std::chrono::seconds(30)</code></td><td>)</td>
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<p>Unlinks the current path of this open handle, causing its entry to immediately disappear from the filing system. On Windows before Windows 10 1709 unless <code>flag::win_disable_unlink_emulation</code> is set, this behaviour is simulated by renaming the file to something random and setting its delete-on-last-close flag. Note that Windows may prevent the renaming of a file in use by another process, if so it will NOT be renamed. After the next handle to that file closes, it will become permanently unopenable by anyone else until the last handle is closed, whereupon the entry will be eventually removed by the operating system.</p>
<dl class="section warning"><dt>Warning</dt><dd>Some operating systems provide a race free syscall for unlinking an open handle (Windows). On all other operating systems this call is <b>racy</b> and can result in the wrong file entry being unlinked. Note that unless <code>flag::disable_safety_unlinks</code> is set, this implementation opens a <code>path_handle</code> to the containing directory first, then checks that the item about to be unlinked has the same inode as the open file handle. It will retry this matching until success until the deadline given. This should prevent most unmalicious accidental loss of data.</dd></dl>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">d</td><td>The deadline by which the matching of the containing directory to the open handle's inode must succeed, else <code>errc::timed_out</code> will be returned. </td></tr>
</table>
</dd>
</dl>
<dl class="section user"><dt>Memory Allocations\n Except on platforms with race free syscalls for unlinking open handles (Windows), calls</dt><dd><code>current_path()</code> and thus is both expensive and calls malloc many times. On Windows, also calls <code>current_path()</code> if <code>flag::disable_safety_unlinks</code> is not set. </dd></dl>
<p>Reimplemented in <a class="el" href="classllfio__v2__xxx_1_1symlink__handle.html#a002c9dab669604d58e08aa8f4dbc99c8">llfio_v2_xxx::symlink_handle</a>.</p>
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<hr/>The documentation for this class was generated from the following file:<ul>
<li>include/llfio/v2.0/<a class="el" href="directory__handle_8hpp.html">directory_handle.hpp</a></li>
</ul>
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<div class="ttc" id="aclassllfio__v2__xxx_1_1handle_html_af0b352d0f273ba6fa70c178b2c2fee42abba3bc579480e6c94ecd81b7b5923255"><div class="ttname"><a href="classllfio__v2__xxx_1_1handle.html#af0b352d0f273ba6fa70c178b2c2fee42abba3bc579480e6c94ecd81b7b5923255">llfio_v2_xxx::handle::creation::only_if_not_exist</a></div><div class="ttdeci">@ only_if_not_exist</div><div class="ttdoc">Filesystem entry must NOT exist, and is atomically created by the success of this operation.</div></div>
<div class="ttc" id="aclassllfio__v2__xxx_1_1directory__handle_html_a1acc9714116df8fbb0651d912a870495"><div class="ttname"><a href="classllfio__v2__xxx_1_1directory__handle.html#a1acc9714116df8fbb0651d912a870495">llfio_v2_xxx::directory_handle::directory</a></div><div class="ttdeci">static result< directory_handle > directory(const path_handle &base, path_view_type path, mode _mode=mode::read, creation _creation=creation::open_existing, caching _caching=caching::all, flag flags=flag::none) noexcept</div></div>
<div class="ttc" id="anamespacellfio__v2__xxx_1_1utils_html_a6a29cf29a4b097411f6c1e5274bfb417"><div class="ttname"><a href="namespacellfio__v2__xxx_1_1utils.html#a6a29cf29a4b097411f6c1e5274bfb417">llfio_v2_xxx::utils::random_string</a></div><div class="ttdeci">std::string random_string(size_t randomlen)</div><div class="ttdoc">Returns a cryptographically random string capable of being used as a filename. Essentially random_fil...</div><div class="ttdef"><b>Definition:</b> utils.hpp:169</div></div>
<div class="ttc" id="anamespacellfio__v2__xxx_1_1path__discovery_html_a2dd74ea752f3f511d58ccccdcac7f4fd"><div class="ttname"><a href="namespacellfio__v2__xxx_1_1path__discovery.html#a2dd74ea752f3f511d58ccccdcac7f4fd">llfio_v2_xxx::path_discovery::storage_backed_temporary_files_directory</a></div><div class="ttdeci">const path_handle & storage_backed_temporary_files_directory() noexcept</div><div class="ttdoc">Returns a reference to an open handle to a verified temporary directory where files created are store...</div></div>
<div class="ttc" id="aclassllfio__v2__xxx_1_1handle_html_a013936bc1254b1a47567fe29698d1b1c"><div class="ttname"><a href="classllfio__v2__xxx_1_1handle.html#a013936bc1254b1a47567fe29698d1b1c">llfio_v2_xxx::handle::flags</a></div><div class="ttdeci">flag flags() const noexcept</div><div class="ttdoc">The flags this handle was opened with.</div><div class="ttdef"><b>Definition:</b> handle.hpp:423</div></div>
<div class="ttc" id="aclassllfio__v2__xxx_1_1directory__handle_html_a6475175eca973ecb66c0cfb118ca1091"><div class="ttname"><a href="classllfio__v2__xxx_1_1directory__handle.html#a6475175eca973ecb66c0cfb118ca1091">llfio_v2_xxx::directory_handle::uniquely_named_directory</a></div><div class="ttdeci">static result< directory_handle > uniquely_named_directory(const path_handle &dirpath, mode _mode=mode::write, caching _caching=caching::temporary, flag flags=flag::none) noexcept</div><div class="ttdef"><b>Definition:</b> directory_handle.hpp:253</div></div>
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