81 lines
2.3 KiB
Groff
81 lines
2.3 KiB
Groff
.\" 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 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 .
|