sem_unlink(3RT) Realtime Library Functions sem_unlink(3RT)
NAME
sem_unlink - remove a named semaphore
SYNOPSIS
cc [ flag... ] file... -lrt [ library... ]
#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(3RT), _exit(2), or one of the exec functions (see exec(2)) . Calls to sem_open(3RT) 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 |Standard |
+-----------------------------+-----------------------------+
|MT-Level |MT-Safe |
+-----------------------------+-----------------------------+
SEE ALSO
exec(2), exit(2), sem_close(3RT), sem_open(3RT), 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 5.10 28 Jun 2002 sem_unlink(3RT)
