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'\" t
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.\" Copyright (C) 2006 Michael Kerrisk <mtk.manpages@gmail.com>
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.\"
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.\" %%%LICENSE_START(VERBATIM)
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.\" Permission is granted to make and distribute verbatim copies of this
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.\" manual provided the copyright notice and this permission notice are
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.\" preserved on all copies.
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.\"
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.\" Permission is granted to copy and distribute modified versions of this
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.\" manual under the conditions for verbatim copying, provided that the
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.\" entire resulting derived work is distributed under the terms of a
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.\" permission notice identical to this one.
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.\"
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.\" Since the Linux kernel and libraries are constantly changing, this
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.\" manual page may be incorrect or out-of-date. The author(s) assume no
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.\" responsibility for errors or omissions, or for damages resulting from
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.\" the use of the information contained herein. The author(s) may not
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.\" have taken the same level of care in the production of this manual,
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.\" which is licensed free of charge, as they might when working
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.\" professionally.
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.\"
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.\" Formatted or processed versions of this manual, if unaccompanied by
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.\" the source, must acknowledge the copyright and authors of this work.
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.\" %%%LICENSE_END
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.\"
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.TH SEM_CLOSE 3 2017-09-15 "Linux" "Linux Programmer's Manual"
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.SH NAME
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sem_close \- close a named semaphore
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.SH SYNOPSIS
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.nf
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.B #include <semaphore.h>
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.PP
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.BI "int sem_close(sem_t *" sem );
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.fi
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.PP
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Link with \fI\-pthread\fP.
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.SH DESCRIPTION
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.BR sem_close ()
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closes the named semaphore referred to by
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.IR sem ,
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allowing any resources that the system has allocated to
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the calling process for this semaphore to be freed.
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.SH RETURN VALUE
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On success
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.BR sem_close ()
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returns 0; on error, \-1 is returned, with
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.I errno
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set to indicate the error.
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.SH ERRORS
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.TP
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.B EINVAL
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.I sem
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is not a valid semaphore.
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.SH ATTRIBUTES
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For an explanation of the terms used in this section, see
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.BR attributes (7).
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.TS
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allbox;
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lb lb lb
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l l l.
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Interface Attribute Value
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T{
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.BR sem_close ()
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T} Thread safety MT-Safe
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.TE
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.sp 1
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.SH CONFORMING TO
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POSIX.1-2001, POSIX.1-2008.
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.SH NOTES
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All open named semaphores are automatically closed on process
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termination, or upon
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.BR execve (2).
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.SH SEE ALSO
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.BR sem_getvalue (3),
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.BR sem_open (3),
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.BR sem_post (3),
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.BR sem_unlink (3),
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.BR sem_wait (3),
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.BR sem_overview (7)
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.SH COLOPHON
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This page is part of release 4.15 of the Linux
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.I man-pages
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project.
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A description of the project,
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information about reporting bugs,
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and the latest version of this page,
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can be found at
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\%https://www.kernel.org/doc/man\-pages/.
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