SEM_UNLINK(3C) Standard C Library Functions SEM_UNLINK(3C)
sem_unlink - remove a named semaphore
#include <semaphore.h>
int sem_unlink(const char *name);
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.
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.
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.
See attributes(7) for descriptions of the following attributes:
+--------------------+-------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-------------------+
|Interface Stability | Committed |
+--------------------+-------------------+
|MT-Level | MT-Safe |
+--------------------+-------------------+
|Standard | See standards(7). |
+--------------------+-------------------+
exec(2), exit(2), sem_close(3C), sem_open(3C), attributes(7),
standards(7)
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)
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)