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+'\" t
+.\" Copyright (C) 2006 Michael Kerrisk <mtk.manpages@gmail.com>
+.\"
+.\" SPDX-License-Identifier: Linux-man-pages-copyleft
+.\"
+.TH sem_close 3 2023-07-20 "Linux man-pages 6.05.01"
+.SH NAME
+sem_close \- close a named semaphore
+.SH LIBRARY
+POSIX threads library
+.RI ( libpthread ", " \-lpthread )
+.SH SYNOPSIS
+.nf
+.B #include <semaphore.h>
+.PP
+.BI "int sem_close(sem_t *" sem );
+.fi
+.SH DESCRIPTION
+.BR sem_close ()
+closes the named semaphore referred to by
+.IR sem ,
+allowing any resources that the system has allocated to
+the calling process for this semaphore to be freed.
+.SH RETURN VALUE
+On success
+.BR sem_close ()
+returns 0; on error, \-1 is returned, with
+.I errno
+set to indicate the error.
+.SH ERRORS
+.TP
+.B EINVAL
+.I sem
+is not a valid semaphore.
+.SH ATTRIBUTES
+For an explanation of the terms used in this section, see
+.BR attributes (7).
+.TS
+allbox;
+lbx lb lb
+l l l.
+Interface	Attribute	Value
+T{
+.na
+.nh
+.BR sem_close ()
+T}	Thread safety	MT-Safe
+.TE
+.sp 1
+.SH STANDARDS
+POSIX.1-2008.
+.SH HISTORY
+POSIX.1-2001.
+.SH NOTES
+All open named semaphores are automatically closed on process
+termination, or upon
+.BR execve (2).
+.SH SEE ALSO
+.BR sem_getvalue (3),
+.BR sem_open (3),
+.BR sem_post (3),
+.BR sem_unlink (3),
+.BR sem_wait (3),
+.BR sem_overview (7)