From: David Bright <d...@freebsd.org> Add an atomic shm rename operation, similar in spirit to a file rename. Atomically unlink an shm from a source path and link it to a destination path. If an existing shm is linked at the destination path, unlink it as part of the same atomic operation. The caller needs the same permissions as shm_unlink to the shm being renamed, and the same permissions for the shm at the destination which is being unlinked, if it exists. If those fail, EACCES is returned, as with the other shm_* syscalls.
truss support is included; audit support will come later. This commit includes only the implementation; the sysent-generated bits will come in a follow-on commit. Submitted by: Matthew Bryan <matthew.br...@isilon.com> Reviewed by: jilles (earlier revision) Reviewed by: brueffer (manpages, earlier revision) Relnotes: yes Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D21423 --- newlib/libc/sys/rtems/include/sys/mman.h | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/newlib/libc/sys/rtems/include/sys/mman.h b/newlib/libc/sys/rtems/include/sys/mman.h index 867b68647..89cc4d699 100644 --- a/newlib/libc/sys/rtems/include/sys/mman.h +++ b/newlib/libc/sys/rtems/include/sys/mman.h @@ -133,6 +133,14 @@ */ #define MAP_FAILED ((void *)-1) +/* + * Flags provided to shm_rename + */ +/* Don't overwrite dest, if it exists */ +#define SHM_RENAME_NOREPLACE (1 << 0) +/* Atomically swap src and dest */ +#define SHM_RENAME_EXCHANGE (1 << 1) + /* * msync() flags */ @@ -264,6 +272,7 @@ int posix_madvise(void *, size_t, int); int mlockall(int); int munlockall(void); int shm_open(const char *, int, mode_t); +int shm_rename(const char *, const char *, int); int shm_unlink(const char *); #endif #if __BSD_VISIBLE -- 2.35.3 _______________________________________________ devel mailing list devel@rtems.org http://lists.rtems.org/mailman/listinfo/devel
