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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
This commit is contained in:
Kyle Evans 2019-09-25 17:59:15 +00:00 committed by Sebastian Huber
parent 878b65b3b6
commit 99b66f5315
1 changed files with 6 additions and 0 deletions
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6
newlib/libc/sys/rtems/include/sys/mman.h
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@ -176,6 +176,12 @@
* Anonymous object constant for shm_open(). * Anonymous object constant for shm_open().
*/ */
#define SHM_ANON ((char *)1) #define SHM_ANON ((char *)1)
/*
* shmflags for shm_open2()
*/
#define SHM_ALLOW_SEALING 0x00000001
#endif /* __BSD_VISIBLE */ #endif /* __BSD_VISIBLE */
/* /*