sem_close(3)						     Library Functions Manual						      sem_close(3)

NAME

       sem_close - Deallocates the specified named semaphore (P1003.1b)

LIBRARY

       Realtime Library (librt.so, librt.a)

SYNOPSIS

       #include <semaphore.h>

       int sem_close (
       sem_t *sem) ;

PARAMETERS

       sem	 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 deallocating 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:

       [EINVAL]       The sem argument is not a valid semaphore descriptor.

RELATED INFORMATION

       Functions: sem_init(3), sem_open(3), sem_unlink(3)

       Guide to Realtime Programming delim off

																      sem_close(3)