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* [newlib-cygwin] Add a shm_open2 syscall to support upcoming memfd_create
@ 2022-07-11 11:50 Sebastian Huber
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From: Sebastian Huber @ 2022-07-11 11:50 UTC (permalink / raw)
To: newlib-cvs
https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=99b66f53154560be576365fba7880f1e2e73de28
commit 99b66f53154560be576365fba7880f1e2e73de28
Author: Kyle Evans <kevans@FreeBSD.org>
Date: Wed Sep 25 17:59:15 2019 +0000
Add a shm_open2 syscall to support upcoming memfd_create
shm_open2 allows a little more flexibility than the original shm_open.
shm_open2 doesn't enforce CLOEXEC on its callers, and it has a separate
shmflag argument that can be expanded later. Currently the only shmflag is
to allow file sealing on the returned fd.
shm_open and memfd_create will both be implemented in libc to use this new
syscall.
__FreeBSD_version is bumped to indicate the presence.
Reviewed by: kib, markj
Differential Revision: https://reviews.freebsd.org/D21393
Diff:
---
newlib/libc/sys/rtems/include/sys/mman.h | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/newlib/libc/sys/rtems/include/sys/mman.h b/newlib/libc/sys/rtems/include/sys/mman.h
index f75490c96..6e178d83d 100644
--- a/newlib/libc/sys/rtems/include/sys/mman.h
+++ b/newlib/libc/sys/rtems/include/sys/mman.h
@@ -176,6 +176,12 @@
* Anonymous object constant for shm_open().
*/
#define SHM_ANON ((char *)1)
+
+/*
+ * shmflags for shm_open2()
+ */
+#define SHM_ALLOW_SEALING 0x00000001
+
#endif /* __BSD_VISIBLE */
/*
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