1SEM_UNLINK(P)              POSIX Programmer's Manual             SEM_UNLINK(P)
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NAME

6       sem_unlink - remove a named semaphore (REALTIME)
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SYNOPSIS

9       #include <semaphore.h>
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11       int sem_unlink(const char *name);
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DESCRIPTION

15       The  sem_unlink()  function  shall  remove  the  semaphore named by the
16       string name. If the semaphore named by name is currently referenced  by
17       other processes, then sem_unlink() shall have no effect on the state of
18       the semaphore. If one or more processes have the  semaphore  open  when
19       sem_unlink() is called, destruction of the semaphore is postponed until
20       all references to  the  semaphore  have  been  destroyed  by  calls  to
21       sem_close(),  _exit(),  or  exec.  Calls  to  sem_open() to recreate or
22       reconnect to the semaphore refer to a new semaphore after  sem_unlink()
23       is  called.  The sem_unlink() call shall not block until all references
24       have been destroyed; it shall return immediately.
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RETURN VALUE

27       Upon successful completion, the sem_unlink() function  shall  return  a
28       value of 0. Otherwise, the semaphore shall not be changed and the func‐
29       tion shall return a value of -1 and set errno to indicate the error.
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ERRORS

32       The sem_unlink() function shall fail if:
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34       EACCES Permission is denied to unlink the named semaphore.
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36       ENAMETOOLONG
37              The length of the name argument exceeds {PATH_MAX} or a pathname
38              component is longer than {NAME_MAX}.
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40       ENOENT The named semaphore does not exist.
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43       The following sections are informative.
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EXAMPLES

46       None.
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APPLICATION USAGE

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

53       None.
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FUTURE DIRECTIONS

56       None.
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SEE ALSO

59       semctl() , semget() , semop() , sem_close() ,  sem_open()  ,  the  Base
60       Definitions volume of IEEE Std 1003.1-2001, <semaphore.h>
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63       Portions  of  this text are reprinted and reproduced in electronic form
64       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
65       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
66       Specifications Issue 6, Copyright (C) 2001-2003  by  the  Institute  of
67       Electrical  and  Electronics  Engineers, Inc and The Open Group. In the
68       event of any discrepancy between this version and the original IEEE and
69       The  Open Group Standard, the original IEEE and The Open Group Standard
70       is the referee document. The original Standard can be  obtained  online
71       at http://www.opengroup.org/unix/online.html .
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75IEEE/The Open Group                  2003                        SEM_UNLINK(P)
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