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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.

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

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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

See also:

sem_init(), sem_open(), sem_unlink()

procnto* in the Utilities Reference

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