sem_close(3)sem_close(3)NAMEsem_close - Deallocates the specified named semaphore (P1003.1b)
SYNOPSIS
#include <semaphore.h>
int sem_close ( sem_t *sem) ;
LIBRARY
Realtime Library (librt.so, librt.a)
PARAMETERS
References the semaphore to be closed. Use the sem argument returned
by the previous call to sem_open.
DESCRIPTION
The sem_close function makes a semaphore available for reuse by deallo‐
cating any system resources allocated for use by the current process
for the named semaphore indicated by sem.
If the semaphore has not been removed with a call to sem_unlink,
sem_close does not change the current state of the semaphore.
If the semaphore has been removed with a call to sem_unlink after the
most recent call to sem_open with O_CREAT, the semaphore is no longer
available after all processes that opened the semaphore close it.
RETURN VALUES
On a successful call, a value of 0 (zero) is returned. Otherwise, a
value of -1 is returned and errno is set to indicate that an error
occurred.
ERRORS
The sem_close function fails under the following condition: The sem
argument is not a valid semaphore descriptor.
SEE ALSO
Functions: sem_init(3), sem_open(3), sem_unlink(3)
Guide to Realtime Programming
sem_close(3)