sem_unlink(3rt) [sunos man page]
sem_unlink(3RT) Realtime Library Functions sem_unlink(3RT) NAME
sem_unlink - remove a named semaphore SYNOPSIS
cc [ flag... ] file... -lrt [ library... ] #include <semaphore.h> int sem_unlink(const char *name); DESCRIPTION
The sem_unlink() function removes the semaphore named by the string name. If the semaphore named by name is currently referenced by other processes, then sem_unlink() has no effect on the state of the semaphore. If one or more processes have the semaphore open when sem_unlink() is called, destruction of the semaphore is postponed until all references to the semaphore have been destroyed by calls to sem_close(3RT), _exit(2), or one of the exec functions (see exec(2)) . Calls to sem_open(3RT) to re-create or re-connect to the semaphore refer to a new semaphore after sem_unlink() is called. The sem_unlink() call does not block until all references have been destroyed; it returns immediately. RETURN VALUES
Upon successful completion, sem_unlink() returns 0. Otherwise, the semaphore is not changed and the function returns a value of -1 and sets errno to indicate the error. ERRORS
The sem_unlink() function will fail if: EACCES Permission is denied to unlink the named semaphore. ENAMETOOLONG The length of name string exceeds PATH_MAX, or a pathname component is longer than NAME_MAX while _POSIX_NO_TRUNC is in effect. ENOENT The named semaphore does not exist. ENOSYS The sem_unlink() function is not supported by the system. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+ SEE ALSO
exec(2), exit(2), sem_close(3RT), sem_open(3RT), attributes(5), standards(5) NOTES
Solaris 2.6 was the first release to support the Asynchronous Input and Output option. Prior to this release, this function always returned -1 and set errno to ENOSYS. SunOS 5.10 28 Jun 2002 sem_unlink(3RT)
Check Out this Related Man Page
SEM_UNLINK(3P) POSIX Programmer's Manual SEM_UNLINK(3P) PROLOG
This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the correspond- ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux. NAME
sem_unlink - remove a named semaphore (REALTIME) SYNOPSIS
#include <semaphore.h> int sem_unlink(const char *name); DESCRIPTION
The sem_unlink() function shall remove the semaphore named by the string name. If the semaphore named by name is currently referenced by other processes, then sem_unlink() shall have no effect on the state of the semaphore. If one or more processes have the semaphore open when sem_unlink() is called, destruction of the semaphore is postponed until all references to the semaphore have been destroyed by calls to sem_close(), _exit(), or exec. Calls to sem_open() to recreate or reconnect to the semaphore refer to a new semaphore after sem_unlink() is called. The sem_unlink() call shall not block until all references have been destroyed; it shall return immediately. RETURN VALUE
Upon successful completion, the sem_unlink() function shall return a value of 0. Otherwise, the semaphore shall not be changed and the function shall return a value of -1 and set errno to indicate the error. ERRORS
The sem_unlink() function shall fail if: EACCES Permission is denied to unlink the named semaphore. ENAMETOOLONG The length of the name argument exceeds {PATH_MAX} or a pathname component is longer than {NAME_MAX}. ENOENT The named semaphore does not exist. The following sections are informative. EXAMPLES
None. APPLICATION USAGE
The sem_unlink() function is part of the Semaphores option and need not be available on all implementations. RATIONALE
None. FUTURE DIRECTIONS
None. SEE ALSO
semctl(), semget(), semop(), sem_close(), sem_open(), the Base Definitions volume of IEEE Std 1003.1-2001, <semaphore.h> COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol- ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html . IEEE
/The Open Group 2003 SEM_UNLINK(3P)