sem_unlink(3c) [opensolaris man page]

sem_unlink(3C)						   Standard C Library Functions 					    sem_unlink(3C)

NAME

       sem_unlink - remove a named semaphore

SYNOPSIS

       #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(3C), _Exit(2), or one of the exec functions (see exec(2)) . Calls to sem_open(3C) 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	     |Committed 		   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+
       |Standard		     |See standards(5). 	   |
       +-----------------------------+-----------------------------+

SEE ALSO

       exec(2), exit(2), sem_close(3C), sem_open(3C), 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 5.11							    5 Feb 2008							    sem_unlink(3C)

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)