SEM_CLOSE(3) Linux Programmer's Manual SEM_CLOSE(3)

sem_close - close a named semaphore

#include <semaphore.h>
int sem_close(sem_t *sem);
Link with -pthread.

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.

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

sem is not a valid semaphore.

For an explanation of the terms used in this section, see attributes(7).
Interface Attribute Value
sem_close () Thread safety MT-Safe

POSIX.1-2001, POSIX.1-2008.

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

sem_getvalue(3), sem_open(3), sem_post(3), sem_unlink(3), sem_wait(3), sem_overview(7)
2017-09-15 Linux