ADC Home > Reference Library > Reference > Mac OS X > Mac OS X Man Pages
|
This document is a Mac OS X manual page. Manual pages are a command-line technology for providing documentation. You can view these manual pages locally using the man(1) command. These manual pages come from many different sources, and thus, have a variety of writing styles. For more information about the manual page format, see the manual page for manpages(5). |
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 speci-fied specified fied by name from that name. The resources associated with the shared memory object remain intact until the last file descriptor reference is removed, e.g., by close(2) or munmap(2), at which point the resources are reclaimed (if no references 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 SHM_NAME_MAX characters. [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 |