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UNIX for Advanced & Expert Users
Reading putty command line parameters from Linux
Post 302307598 by tpietschmann on Wednesday 15th of April 2009 10:17:58 PM
04-15-2009
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LEARN ABOUT LINUX
setsid
SETSID(2) Linux Programmer's Manual SETSID(2) NAME
setsid - creates a session and sets the process group ID SYNOPSIS
#include <unistd.h> pid_t setsid(void); DESCRIPTION
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. RETURN VALUE
On success, the (new) session ID of the calling process is returned. On error, (pid_t) -1 is returned, and errno is set to indicate the error. ERRORS
EPERM 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. CONFORMING TO
SVr4, POSIX.1-2001. NOTES
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(). SEE ALSO
getsid(2), setpgid(2), setpgrp(2), tcgetsid(3), credentials(7) COLOPHON
This page is part of release 3.27 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/. Linux 2008-12-03 SETSID(2)