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sem_close
<html> <head> <title>sem_close</title> <META NAME="KEYWORDS" CONTENT="sem_close"> </head> <body BGCOLOR="#ffffff" LINK="#0000ff" VLINK="#0000ff" ALINK="#0000ff" TEXT="#000000"> <center> <h1><b>sem_close</b></h1></center> <PRE> <STRONG><A HREF="/man3/SEM_CLOSE">SEM_CLOSE(3)</A></STRONG> Linux Programmer's Manual <STRONG><A HREF="/man3/SEM_CLOSE">SEM_CLOSE(3)</A></STRONG> 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 at- <STRONG><A HREF="/man7/tributes">tributes(7)</A></STRONG>. +------------+---------------+---------+ |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 <STRONG><A HREF="/man2/execve">execve(2)</A></STRONG>. SEE ALSO <STRONG><A HREF="/man3/sem_getvalue">sem_getvalue(3)</A></STRONG>, <STRONG><A HREF="/man3/sem_open">sem_open(3)</A></STRONG>, <STRONG><A HREF="/man3/sem_post">sem_post(3)</A></STRONG>, <STRONG><A HREF="/man3/sem_unlink">sem_unlink(3)</A></STRONG>, <STRONG><A HREF="/man3/sem_wait">sem_wait(3)</A></STRONG>, <STRONG><A HREF="/man7/sem_overview">sem_overview(7)</A></STRONG> COLOPHON This page is part of release 5.05 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 <STRONG><A HREF="/man3/SEM_CLOSE">SEM_CLOSE(3)</A></STRONG></PRE> <center> <h6>Man Pages Copyright Respective Owners. Site Copyright (C) 1994 - 2025 <a href="http://www.he.net">Hurricane Electric</a>. All Rights Reserved.</h6></center> </body> </html>