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(7) for descriptions of the following attributes:
+--------------------+-------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-------------------+
|Interface Stability | Committed |
+--------------------+-------------------+
|MT-Level | MT-Safe |
+--------------------+-------------------+
|Standard | See
standards(7). |
+--------------------+-------------------+
SEE ALSO
exec(2),
exit(2),
sem_close(3C),
sem_open(3C),
attributes(7),
standards(7)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.
February 5, 2008 SEM_UNLINK(3C)
