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-.\" 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.
-.\"
-.\" $FreeBSD$
-.\"
-.Dd August 19, 1997
-.Dt GETSID 2
-.Os
-.Sh NAME
-.Nm getsid
-.Nd get process session
-.Sh LIBRARY
-.Lb libc
-.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
-.Fn getsid
-system call
-returns the session ID of
-the specified process; otherwise, it returns a value of -1 and
-sets errno to indicate an error.
-.Sh ERRORS
-The
-.Fn getsid
-system call
-will succeed unless:
-.Bl -tag -width Er
-.It Bq Er ESRCH
-if there is no process with a process ID equal to
-.Fa pid .
-.El
-.Pp
-Note that an implementation may restrict this system call to
-processes within the same session ID as the calling process.
-.Sh SEE ALSO
-.Xr getpgid 2 ,
-.Xr getpgrp 2 ,
-.Xr setpgid 2 ,
-.Xr setsid 2 ,
-.Xr termios 4
-.Sh HISTORY
-The
-.Fn getsid
-system call appeared in
-.Fx 3.0 .
-The
-.Fn getsid
-system call is derived from its usage in
-.At V .