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SHM_UNLINK(2) BSD System Calls Manual SHM_UNLINK(2) NAME shm_unlink -- remove shared memory object SYNOPSIS #include <sys/mman.h> int shm_unlink(const char *name); DESCRIPTION The shm_unlink() function disassociates the shared memory object specified by name from that name. The resources associated with the shared memory object remain intact until the last file descriptor refer-ence reference ence is removed, e.g., by close(2) or munmap(2), at which point the resources are reclaimed (if no ref-erences references erences exist at the time of the call to shm_unlink(), the resources are reclaimed immediately). The name can only be reused when it is bound to a new shared memory object with a call to shm_open(2) with the O_CREAT flag. RETURN VALUES Upon successful completion, a value of 0 is returned. Otherwise, a value of -1 is returned and errno is set to indicate the error, and the named shared memory object will remain unchanged. ERRORS The shm_unlink() succeeds unless: [EACCES] Permission is denied to be remove the object. [ENAMETOOLONG] name exceeded the name size limit. This is currently PSHMNAMLEN characters (defined in <sys/posix_shm.h>), but this may change in the future. [ENOENT] The named object does not exist. SEE ALSO close(2), mmap(2), munmap(2), shm_open(2), shmat(2), shmctl(2) HISTORY shm_open() is specified in the POSIX Realtime Extension (1003.1b-1993/1003.1i-1995). Darwin August 31, 2006 Darwin |
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