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Cygwin: open: workaround reopen file w/ delete disposition set

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On pre-W10 systems there's no way to reopen a file by handle if
the delete disposition is set.  We try to get around with
duplicating the handle.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
This commit is contained in:
Corinna Vinschen 2019-01-08 21:37:43 +01:00
parent 0c545f3264
commit ec36c59f1a
1 changed files with 17 additions and 0 deletions
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17
winsup/cygwin/fhandler.cc
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@ -693,6 +693,23 @@ fhandler_base::open (int flags, mode_t mode)
status = NtCreateFile (&fh, access, &attr, &io, NULL, file_attributes, shared,
create_disposition, options, p, plen);
/* Pre-W10, we can't open a file by handle with delete disposition
set, so we have to lie our ass off. */
if (get_handle () && status == STATUS_DELETE_PENDING)
{
BOOL ret = DuplicateHandle (GetCurrentProcess (), get_handle (),
GetCurrentProcess (), &fh,
access, !(flags & O_CLOEXEC), 0);
if (!ret)
ret = DuplicateHandle (GetCurrentProcess (), get_handle (),
GetCurrentProcess (), &fh,
0, !(flags & O_CLOEXEC),
DUPLICATE_SAME_ACCESS);
if (!ret)
debug_printf ("DuplicateHandle after STATUS_DELETE_PENDING, %E");
else
status = STATUS_SUCCESS;
}
if (!NT_SUCCESS (status))
{
/* Trying to create a directory should return EISDIR, not ENOENT. */