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From: Sebastian Huber <>
Subject: [newlib-cygwin] Add a shm_open2 syscall to support upcoming memfd_create
Date: Mon, 11 Jul 2022 11:50:38 +0000 (GMT)	[thread overview]
Message-ID: <> (raw);h=99b66f53154560be576365fba7880f1e2e73de28

commit 99b66f53154560be576365fba7880f1e2e73de28
Author: Kyle Evans <>
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
    __FreeBSD_version is bumped to indicate the presence.
    Reviewed by:    kib, markj
    Differential Revision:

 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 */

                 reply	other threads:[~2022-07-11 11:50 UTC|newest]

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