setsid man page on Archlinux

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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 terminal.  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 ses‐

       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().

       setsid(1),  getsid(2),  setpgid(2),  setpgrp(2),	 tcgetsid(3),  creden‐

       This  page  is  part of release 3.65 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at

Linux				  2013-02-11			     SETSID(2)

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