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Linux 2.6 - man page for sem_unlink (linux section 3posix)

SEM_UNLINK(P)			    POSIX Programmer's Manual			    SEM_UNLINK(P)

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 sem-
       aphore 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 ref-
       erences	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.  Other-
       wise,  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 Technology  --  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 orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003				    SEM_UNLINK(P)


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