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SETSID(2)		   Linux Programmer's Manual		     SETSID(2)

       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 control‐
       ling 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 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

       EPERM. The process group ID of any process equals the PID of the	 call‐
	      ing process.  Thus, in particular, setsid() fails if the calling
	      process is already a process group leader.

       SVr4, POSIX.1-2001.

       A child created via fork(2) inherits its parent's session ID.  The ses‐
       sion 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().

       getsid(2), setpgid(2), setpgrp(2), tcgetsid(3), credentials(7)

       This  page  is  part of release 3.22 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at

Linux				  2008-12-03			     SETSID(2)

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