centos man page for sem_unlink

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)