SEM_UNLINK(3C)SEM_UNLINK(3C)NAMEsem_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 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(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 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 semaphore.
ENAMETOOLONG
The length of name string exceeds PATH_MAX, or a path‐
name 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 sys‐
tem.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌────────────────────┬───────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├────────────────────┼───────────────────┤
│Interface Stability │ Committed │
├────────────────────┼───────────────────┤
│MT-Level │ MT-Safe │
├────────────────────┼───────────────────┤
│Standard │ See standards(5). │
└────────────────────┴───────────────────┘
SEE ALSOexec(2), exit(2), sem_close(3C), sem_open(3C), 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.
Feb 5, 2008 SEM_UNLINK(3C)
