diff options
Diffstat (limited to 'winsup/cygwin/mmap.cc')
| -rw-r--r-- | winsup/cygwin/mmap.cc | 34 |
1 files changed, 27 insertions, 7 deletions
diff --git a/winsup/cygwin/mmap.cc b/winsup/cygwin/mmap.cc index 37cc32169..78e60f121 100644 --- a/winsup/cygwin/mmap.cc +++ b/winsup/cygwin/mmap.cc @@ -22,6 +22,7 @@ details. */ #include "sigproc.h" #include "pinfo.h" #include "security.h" +#include "sys/cygwin.h" #define PAGE_CNT(bytes) howmany(bytes,getpagesize()) @@ -739,13 +740,32 @@ fhandler_disk_file::mmap (caddr_t *addr, size_t len, DWORD access, else protect = PAGE_READONLY; - HANDLE h = CreateFileMapping (get_handle (), - &sec_none, - protect, - 0, - get_handle () == INVALID_HANDLE_VALUE ? len : 0, - NULL); - if (h == 0) + HANDLE h; + + /* On 9x/ME try first to open the mapping by name when opening a + shared file object. This is needed since 9x/ME only shares + objects between processes by name. What a mess... */ + if (os_being_run != winNT + && get_handle () != INVALID_HANDLE_VALUE + && get_device () == FH_DISK + && !(access & FILE_MAP_COPY)) + { + /* Grrr, the whole stuff is just needed to try to get a reliable + mapping of the same file. Even that uprising isn't bullet + proof but it does it's best... */ + char namebuf[MAX_PATH]; + cygwin_conv_to_full_posix_path (get_name (), namebuf); + for (int i = strlen (namebuf) - 1; i >= 0; --i) + namebuf[i] = cyg_tolower (namebuf [i]); + + if (!(h = OpenFileMapping (access, TRUE, namebuf))) + h = CreateFileMapping (get_handle(), &sec_none, protect, 0, 0, namebuf); + } + else + h = CreateFileMapping (get_handle (), &sec_none, protect, 0, + get_handle () == INVALID_HANDLE_VALUE ? len : 0, + NULL); + if (!h) { __seterrno (); syscall_printf ("-1 = mmap(): CreateFileMapping failed with %E"); |