SEM_UNLINK
Section: POSIX Programmer's Manual (P)
Updated: 2003
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 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 original Standard can be obtained online at
http://www.opengroup.org/unix/online.html .
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- EXAMPLES
-
- APPLICATION USAGE
-
- RATIONALE
-
- FUTURE DIRECTIONS
-
- SEE ALSO
-
- COPYRIGHT
-
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