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* mmap.cc (fhandler_disk_file::mmap): Try to open file mappings

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by a unified name when running under 9x/ME. If that failes, create
        the file mapping using the unified name.
This commit is contained in:
Corinna Vinschen
2001-07-10 21:04:14 +00:00
parent a8506a1917
commit 8595942c8e
2 changed files with 33 additions and 7 deletions
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6
winsup/cygwin/ChangeLog
View File

@@ -1,3 +1,9 @@
Tue Jul 10 23:01:00 2001 Corinna Vinschen <corinna@vinschen.de>
* mmap.cc (fhandler_disk_file::mmap): Try to open file mappings
by a unified name when running under 9x/ME. If that failes, create
the file mapping using the unified name.
Mon Jul 9 10:43:00 2001 Corinna Vinschen <corinna@vinschen.de>
* uinfo.cc (internal_getlogin): Add pointer check.

34
winsup/cygwin/mmap.cc
View File

@@ -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");