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Add an shm_rename syscall 

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.bryan@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
This commit is contained in:
David Bright 2019-09-26 15:32:28 +00:00 committed by Sebastian Huber
parent 9243caa8d3
commit 53648039c4
1 changed files with 9 additions and 0 deletions
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9
newlib/libc/sys/rtems/include/sys/mman.h
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@ -133,6 +133,14 @@
*/ */
#define MAP_FAILED ((void *)-1) #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 * msync() flags
*/ */
@ -264,6 +272,7 @@ int posix_madvise(void *, size_t, int);
int mlockall(int); int mlockall(int);
int munlockall(void); int munlockall(void);
int shm_open(const char *, int, mode_t); int shm_open(const char *, int, mode_t);
int shm_rename(const char *, const char *, int);
int shm_unlink(const char *); int shm_unlink(const char *);
#endif #endif
#if __BSD_VISIBLE #if __BSD_VISIBLE