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sem_close(3) — Linux manual page

sem_close(3)             Library Functions Manualsem_close(3)

NAME        top

       sem_close - close a named semaphore

LIBRARY        top

       POSIX threads library (libpthread,-lpthread)

SYNOPSIS        top

#include <semaphore.h>int sem_close(sem_t *sem);

DESCRIPTION        top

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

RETURN VALUE        top

       On successsem_close() returns 0; on error, -1 is returned, witherrno set to indicate the error.

ERRORS        top

EINVALsem is not a valid semaphore.

ATTRIBUTES        top

       For an explanation of the terms used in this section, seeattributes(7).       ┌──────────────────────────────────────┬───────────────┬─────────┐       │Interface│Attribute│Value│       ├──────────────────────────────────────┼───────────────┼─────────┤       │sem_close()                          │ Thread safety │ MT-Safe │       └──────────────────────────────────────┴───────────────┴─────────┘

STANDARDS        top

       POSIX.1-2008.

HISTORY        top

       POSIX.1-2001.

NOTES        top

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

SEE ALSO        top

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

COLOPHON        top

       This page is part of theman-pages (Linux kernel and C library       user-space interface documentation) project.  Information about       the project can be found at        ⟨https://www.kernel.org/doc/man-pages/⟩.  If you have a bug report       for this manual page, see       ⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.       This page was obtained from the tarball man-pages-6.15.tar.gz       fetched from       ⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on       2025-08-11.  If you discover any rendering problems in this HTML       version of the page, or you believe there is a better or more up-       to-date source for the page, or you have corrections or       improvements to the information in this COLOPHON (which isnot       part of the original manual page), send a mail to       man-pages@man7.orgLinux man-pages 6.15            2025-05-17sem_close(3)

Pages that refer to this page:sem_open(3), sem_overview(7)

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