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80 lines
2.4 KiB
Groff
80 lines
2.4 KiB
Groff
.\" Copyright (c) 1997 Peter Wemm <peter@freebsd.org>
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd August 19, 1997
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.Dt GETSID 2
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.Os BSD 4.2
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.Sh NAME
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.Nm getsid
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.Nd get process session
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.Fd #include <unistd.h>
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.Ft pid_t
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.Fn getsid "pid_t pid"
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.Sh DESCRIPTION
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The session ID of the process identified by
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.Fa pid
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is returned by
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.Fn getsid .
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If
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.Fa pid
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is zero,
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.Fn getsid
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returns the session ID of the current process.
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.Sh RETURN VALUES
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Upon successful completion, the function
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.Fn getsid
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returns the session ID of
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the specified process; otherwise, it returns a value of -1 and
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sets errno to indicate an error.
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.Sh ERRORS
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.Fn getsid
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will succeed unless:
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.Bl -tag -width Er
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.It Bq Er ESRCH
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if there is no process with a process ID equal to
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.Fa pid .
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.El
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.Pp
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Note that an implementation may restrict this function call to
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processes within the same session ID as the calling process.
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.Sh SEE ALSO
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.Xr getpgid 2 ,
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.Xr getpgrp 2 ,
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.Xr setpgid 2 ,
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.Xr setsid 2 ,
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.Xr termios 4
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.Sh HISTORY
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The
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.Fn setsid
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function call appeared in
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.Fx 3.0 .
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The
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.Fn getsid
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function call is derived from it's usage in
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.At V .
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