setsid — creates a session and sets the process group ID
#include <unistd.h>
pid_t
setsid( |
void); |
setsid() creates a new
session if the calling process is not a process group leader.
The calling process is the leader of the new session, the
process group leader of the new process group, and has no
controlling tty. The process group ID and session ID of the
calling process are set to the PID of the calling process.
The calling process will be the only process in this new
process group and in this new session.
On error, −1 is returned, and errno is set. The only error which can
happen is EPERM. It is
returned when the process group ID of any process equals the
PID of the calling process. Thus, in particular, setsid() fails if the calling process is
already a process group leader.
A child created via fork(2) inherits its parent's session ID. The session ID is preserved across an execve(2).
A process group leader is a process with process group ID
equal to its PID. In order to be sure that setsid() will succeed, fork(2) and _exit(2), and have the
child do setsid().
This page is part of release 2.79 of the Linux man-pages project. A
description of the project, and information about reporting
bugs, can be found at
http://www.kernel.org/doc/man-pages/.
|
Copyright Michael Haardt (michaelcantor.informatik.rwth-aachen.de) Sat Aug 27 20:43:50 MET DST 1994 This is free documentation; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. The GNU General Public License's references to "object code" and "executables" are to be interpreted as the output of any document formatting or typesetting system, including intermediate and printed output. This manual is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this manual; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA. Modified Sun Sep 11 19:19:05 1994 <faithcs.unc.edu> Modified Mon Mar 25 10:19:00 1996 <aebcwi.nl> (merged a few tiny changes from a man page by Charles Livingston). Modified Sun Jul 21 14:45:46 1996 <aebcwi.nl> |