Unix/Linux Go Back    

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

Linux & Unix Commands - Search Man Pages
Man Page or Keyword Search:   man
Select Man Page Set:       apropos Keyword Search (sections above)

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

       sem_unlink - remove a named semaphore (REALTIME)

       #include <semaphore.h>

       int sem_unlink(const char *name);

       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.

       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.

       The sem_unlink() function shall fail if:

       EACCES Permission is denied to unlink the named semaphore.

	      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.


       The  sem_unlink()  function  is part of the Semaphores option and need not be available on
       all implementations.



       semctl() , semget() , semop() , sem_close() , sem_open() , the Base Definitions volume  of
       IEEE Std 1003.1-2001, <semaphore.h>

       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)
Unix & Linux Commands & Man Pages : ©2000 - 2018 Unix and Linux Forums

All times are GMT -4. The time now is 02:02 PM.