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

NAME
       sem_close - close a named semaphore

SYNOPSIS
       #include <semaphore.h>

       int sem_close(sem_t *sem);

       Link with -pthread.

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).

       ┌──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┬───────────────┬─────────┐
       │Interface                                                                                                                             │ Attribute     │ Value   │
       ├──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┼───────────────┼─────────┤
       │sem_close()                                                                                                                           │ Thread safety │ MT-Safe │
       └──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┴───────────────┴─────────┘

CONFORMING TO
       POSIX.1-2001, POSIX.1-2008.

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)

Linux                                                                          2021-03-22                                                                   SEM_CLOSE(3)