86 lines
3.0 KiB
Groff
86 lines
3.0 KiB
Groff
.\" 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. All advertising materials mentioning features or use of this software
|
|
.\" must display the following acknowledgement:
|
|
.\" This product includes software developed by the University of
|
|
.\" California, Berkeley and its contributors.
|
|
.\" 4. 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
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd June 4, 1993
|
|
.Dt SETSID 2
|
|
.Os
|
|
.Sh NAME
|
|
.Nm setsid
|
|
.Nd create session and set process group ID
|
|
.Sh LIBRARY
|
|
.Lb libc
|
|
.Sh SYNOPSIS
|
|
.Fd #include <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.
|
|
.Sh RETURN VALUES
|
|
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.
|
|
If an error occurs,
|
|
.Fn setsid
|
|
returns -1 and the global variable
|
|
.Va errno
|
|
is set to indicate the error.
|
|
.Sh ERRORS
|
|
The
|
|
.Fn setsid
|
|
function will fail if:
|
|
.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 setpgid 2 ,
|
|
.Xr tcgetpgrp 3 ,
|
|
.Xr tcsetpgrp 3
|
|
.Sh STANDARDS
|
|
The
|
|
.Fn setsid
|
|
function is expected to be compliant with the
|
|
.St -p1003.1-90
|
|
specification.
|