sem_unlink(3RT) Realtime Library Functions sem_unlink(3RT)NAMEsem_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 sema‐
phore. 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 sem‐
aphore 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 sema‐
phore.
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 ALSOexec(2), exit(2), sem_close(3RT), sem_open(3RT), attributes(5), stan‐
dards(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)
