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+.\"	$OpenBSD: getsid.2,v 1.12 2015/09/10 17:55:21 schwarze Exp $
+.\"
+.\" Copyright (c) 1997 Peter Wemm <peter@freebsd.org>
+.\"
+.\" 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.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
+.\"
+.\"
+.Dd $Mdocdate: September 10 2015 $
+.Dt GETSID 2
+.Os
+.Sh NAME
+.Nm getsid
+.Nd get process session
+.Sh SYNOPSIS
+.In unistd.h
+.Ft pid_t
+.Fn getsid "pid_t pid"
+.Sh DESCRIPTION
+The session ID of the process identified by
+.Fa pid
+is returned by
+.Fn getsid .
+If
+.Fa pid
+is zero,
+.Fn getsid
+returns the session ID of the current process.
+.Sh RETURN VALUES
+Upon successful completion, the function
+.Fn getsid
+returns the session ID of
+the specified process; otherwise, it returns a value of \-1 and
+sets
+.Va errno
+to indicate an error.
+.Sh ERRORS
+.Fn getsid
+will succeed unless:
+.Bl -tag -width Er
+.It Bq Er EPERM
+The current process and the process
+.Fa pid
+are not in the same session.
+.It Bq Er ESRCH
+There is no process with a process ID equal to
+.Fa pid .
+.El
+.Sh SEE ALSO
+.Xr getpgid 2 ,
+.Xr getpgrp 2 ,
+.Xr setpgid 2 ,
+.Xr setsid 2 ,
+.Xr termios 4
+.Sh STANDARDS
+.Fn getsid
+conforms to
+.St -p1003.1-2008 .
+.Sh HISTORY
+The
+.Fn getsid
+function call is derived from its usage in
+.At V ,
+and is mandated by
+.St -xpg4 .