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 termina-
       tion, or upon execve(2).

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

COLOPHON
       This  page  is  part of release 4.16 of the Linux man-pages project.  A
       description of the project, information about reporting bugs,  and  the
       latest     version     of     this    page,    can    be    found    at
       https://www.kernel.org/doc/man-pages/.



Linux                             2017-09-15                      SEM_CLOSE(3)