NAME¶

sem_close - close a named semaphore

LIBRARY¶

POSIX threads library (libpthread, -lpthread)

SYNOPSIS¶

#include <semaphore.h>

int sem_close(sem_t *sem);

DESCRIPTION¶

sem_close() closes the named semaphore referred to by sem, allowing any resources that the system has allocated to the calling process for this semaphore to be freed.

RETURN VALUE¶

On success sem_close() returns 0; on error, -1 is returned, with errno set to indicate the error.

ERRORS¶

EINVAL

sem is not a valid semaphore.

ATTRIBUTES¶

For an explanation of the terms used in this section, see attributes(7).

STANDARDS¶

POSIX.1-2008.

HISTORY¶

POSIX.1-2001.

NOTES¶

All open named semaphores are automatically closed on process termination, or upon execve(2).

SEE ALSO¶

sem_getvalue(3), sem_open(3), sem_post(3), sem_unlink(3), sem_wait(3), sem_overview(7)