sem_close()

Close a named semaphore

Synopsis:

#include <semaphore.h>

int sem_close( sem_t * sem );

Arguments:

sem: A pointer to a semaphore, as returned by sem_open().

Library:

libc

Use the -l c option to qcc to link against this library. This library is usually included automatically.

Description:

The sem_close() function closes the named semaphore sem opened by sem_open(), releasing any system resources associated with the sem.

Don't mix named semaphore operations (sem_open() and sem_close()) with unnamed semaphore operations (sem_init() and sem_destroy()) on the same semaphore.

Returns:

0: Success.
-1: An error occurred (errno is set).

Errors:

EINVAL: Invalid semaphore descriptor sem.

Classification:

POSIX 1003.1 SEM

Safety:
Cancellation point	No
Interrupt handler	No
Signal handler	Yes
Thread	Yes