https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=ec36c59f1a9349e690849e393251623f5936408c
commit ec36c59f1a9349e690849e393251623f5936408c
Author: Corinna Vinschen <cori...@vinschen.de>
Date: Tue Jan 8 21:37:43 2019 +0100
Cygwin: open: workaround reopen file w/ delete disposition set
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 <cori...@vinschen.de>
Diff:
---
winsup/cygwin/fhandler.cc | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/winsup/cygwin/fhandler.cc b/winsup/cygwin/fhandler.cc
index 9af08d7..9643373 100644
--- a/winsup/cygwin/fhandler.cc
+++ b/winsup/cygwin/fhandler.cc
@@ -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. */
