Man Pages

setsid(2) - phpMan setsid(2) - phpMan

Command: man perldoc info search(apropos)  


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, set-
              sid() 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 3.22 of the Linux man-pages project.  A description of the project,  and  informa-
       tion about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.



Linux                             2008-12-03                         SETSID(2)