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+.\"	$OpenBSD: setsid.2,v 1.15 2023/01/12 12:56:07 jsg Exp $
+.\"	$NetBSD: setsid.2,v 1.3 1995/10/12 15:41:13 jtc Exp $
+.\"
+.\" Copyright (c) 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"	@(#)setsid.2	8.1 (Berkeley) 6/4/93
+.\"
+.Dd $Mdocdate: January 12 2023 $
+.Dt SETSID 2
+.Os
+.Sh NAME
+.Nm setsid
+.Nd create session and set process group ID
+.Sh SYNOPSIS
+.In unistd.h
+.Ft pid_t
+.Fn setsid "void"
+.Sh DESCRIPTION
+The
+.Fn setsid
+function creates a new session.
+The calling process is the session leader of the new session, is the
+process group leader of a new process group and has no controlling
+terminal.
+The calling process is the only process in either the session or the
+process group.
+.Pp
+Upon successful completion, the
+.Fn setsid
+function returns the value of the process group ID of the new process
+group, which is the same as the process ID of the calling process.
+.Sh ERRORS
+If an error occurs,
+.Fn setsid
+returns \-1 and the global variable
+.Va errno
+is set to indicate the error, as follows:
+.Bl -tag -width Er
+.It Bq Er EPERM
+The calling process is already a process group leader, or the process
+group ID of a process other than the calling process matches the process
+ID of the calling process.
+.El
+.Sh SEE ALSO
+.Xr getsid 2 ,
+.Xr setpgid 2 ,
+.Xr tcgetpgrp 3 ,
+.Xr tcsetpgrp 3
+.Sh STANDARDS
+The
+.Fn setsid
+function is compliant with the
+.St -p1003.1-2008
+specification.