diff options
Diffstat (limited to 'winsup/cygwin/fhandler.cc')
-rw-r--r-- | winsup/cygwin/fhandler.cc | 120 |
1 files changed, 77 insertions, 43 deletions
diff --git a/winsup/cygwin/fhandler.cc b/winsup/cygwin/fhandler.cc index 0e0981fdc..714c46ad0 100644 --- a/winsup/cygwin/fhandler.cc +++ b/winsup/cygwin/fhandler.cc @@ -1037,10 +1037,17 @@ fhandler_base::close () __seterrno (); } - destroy_overlapped (); return res; } + +int +fhandler_base_overlapped::close () +{ + destroy_overlapped (); + return fhandler_base::close (); +} + int fhandler_base::ioctl (unsigned int cmd, void *buf) { @@ -1162,11 +1169,17 @@ fhandler_base::dup (fhandler_base *child) VerifyHandle (nh); child->set_io_handle (nh); } - if (get_overlapped ()) - child->setup_overlapped (); return 0; } +int +fhandler_base_overlapped::dup (fhandler_base *child) +{ + int res = fhandler_base::dup (child) || + ((fhandler_base_overlapped *) child)->setup_overlapped (); + return res; +} + int fhandler_base::fcntl (int cmd, void *arg) { int res; @@ -1335,8 +1348,6 @@ fhandler_base::fork_fixup (HANDLE parent, HANDLE &h, const char *name) VerifyHandle (h); res = true; } - if (get_overlapped ()) - setup_overlapped (); return res; } @@ -1355,22 +1366,31 @@ fhandler_base::fixup_after_fork (HANDLE parent) debug_printf ("inheriting '%s' from parent", get_name ()); if (!nohandle ()) fork_fixup (parent, io_handle, "io_handle"); - if (get_overlapped ()) - setup_overlapped (); /* POSIX locks are not inherited across fork. */ if (unique_id) del_my_locks (after_fork); } void +fhandler_base_overlapped::fixup_after_fork (HANDLE parent) +{ + setup_overlapped (); + fhandler_base::fixup_after_fork (parent); +} + +void fhandler_base::fixup_after_exec () { debug_printf ("here for '%s'", get_name ()); - if (get_overlapped ()) - setup_overlapped (); if (unique_id && close_on_exec ()) del_my_locks (after_exec); } +void +fhandler_base_overlapped::fixup_after_exec () +{ + setup_overlapped (); + fhandler_base::fixup_after_exec (); +} bool fhandler_base::is_nonblocking () @@ -1644,27 +1664,18 @@ fhandler_base::fpathconf (int v) /* Overlapped I/O */ -bool -fhandler_base::setup_overlapped (bool doit) +int +fhandler_base_overlapped::setup_overlapped () { OVERLAPPED *ov = get_overlapped_buffer (); memset (ov, 0, sizeof (*ov)); - bool res; - if (doit) - { - set_overlapped (ov); - res = !!(ov->hEvent = CreateEvent (&sec_none_nih, true, true, NULL)); - } - else - { - set_overlapped (NULL); - res = false; - } - return res; + set_overlapped (ov); + ov->hEvent = CreateEvent (&sec_none_nih, true, true, NULL); + return ov->hEvent ? 0 : -1; } void -fhandler_base::destroy_overlapped () +fhandler_base_overlapped::destroy_overlapped () { OVERLAPPED *ov = get_overlapped (); if (ov && ov->hEvent) @@ -1672,10 +1683,26 @@ fhandler_base::destroy_overlapped () CloseHandle (ov->hEvent); ov->hEvent = NULL; } + io_pending = false; + get_overlapped () = NULL; +} + +bool +fhandler_base_overlapped::has_ongoing_io () +{ + if (!io_pending) + return false; + if (WaitForSingleObject (get_overlapped ()->hEvent, 0) != WAIT_OBJECT_0) + { + set_errno (EAGAIN); + return true; + } + io_pending = false; + return false; } int -fhandler_base::wait_overlapped (bool inres, bool writing, DWORD *bytes, DWORD len) +fhandler_base_overlapped::wait_overlapped (bool inres, bool writing, DWORD *bytes, DWORD len) { if (!get_overlapped ()) return inres; @@ -1687,6 +1714,7 @@ fhandler_base::wait_overlapped (bool inres, bool writing, DWORD *bytes, DWORD le { if (inres || err == ERROR_IO_PENDING) { + io_pending = err == ERROR_IO_PENDING; if (writing && !inres) *bytes = len; /* This really isn't true but it seems like this is a corner-case for linux's @@ -1758,32 +1786,38 @@ fhandler_base::wait_overlapped (bool inres, bool writing, DWORD *bytes, DWORD le } void __stdcall -fhandler_base::read_overlapped (void *ptr, size_t& len) +fhandler_base_overlapped::read_overlapped (void *ptr, size_t& len) { DWORD nbytes; - while (1) - { - bool res = ReadFile (get_handle (), ptr, len, &nbytes, - get_overlapped ()); - int wres = wait_overlapped (res, false, &nbytes); - if (wres || !_my_tls.call_signal_handler ()) - break; - } + if (has_ongoing_io ()) + nbytes = (DWORD) -1; + else + while (1) + { + bool res = ReadFile (get_handle (), ptr, len, &nbytes, + get_overlapped ()); + int wres = wait_overlapped (res, false, &nbytes); + if (wres || !_my_tls.call_signal_handler ()) + break; + } len = (size_t) nbytes; } ssize_t __stdcall -fhandler_base::write_overlapped (const void *ptr, size_t len) +fhandler_base_overlapped::write_overlapped (const void *ptr, size_t len) { DWORD nbytes; - while (1) - { - bool res = WriteFile (get_output_handle (), ptr, len, &nbytes, - get_overlapped ()); - int wres = wait_overlapped (res, true, &nbytes, (size_t) len); - if (wres || !_my_tls.call_signal_handler ()) - break; - } + if (has_ongoing_io ()) + nbytes = (DWORD) -1; + else + while (1) + { + bool res = WriteFile (get_output_handle (), ptr, len, &nbytes, + get_overlapped ()); + int wres = wait_overlapped (res, true, &nbytes, (size_t) len); + if (wres || !_my_tls.call_signal_handler ()) + break; + } debug_printf ("returning %u", nbytes); return nbytes; } |