setsid(2)

NAME
     setsid, getpgrp - create process group, get process group id

SYNOPSIS
     #include <sys/types.h>
     #include <unistd.h>

     pid_t setsid(void)
     pid_t getpgrp(void)

DESCRIPTION
     Setsid() creates a new session if the calling process is  not  already  a
     session  leader.  The calling process becomes the session leader of a new
     process group and the process group ID of this new process group will  be
     equal  to the process ID of the new session leader.  The process group ID
     is inherited on a fork(2).

     Getpgrp() returns the process group ID of the calling process.

SEE ALSO
     kill(2), termios(3), tty(4).

DIAGNOSTICS
     Setsid() returns the new process group ID on success, or  -1  with  errno
     set to EPERM if the process is already a session leader.

AUTHOR
     Kees J. Bot (kjb@cs.vu.nl)