4.4BSD/usr/share/man/cat2/setsid.0

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

NNAAMMEE
     sseettssiidd - create session and set process group ID

SSYYNNOOPPSSIISS
     ##iinncclluuddee <<ssyyss//ttyyppeess..hh>>

     _p_i_d___t
     sseettssiidd(_v_o_i_d);

DDEESSCCRRIIPPTTIIOONN
     The sseettssiidd function creates a new session.  The calling process is the
     session leader of the new session, is the process group leader of a new
     process group and has no controlling terminal.  The calling process is
     the only process in either the session or the process group.

     Upon successful completion, the sseettssiidd function returns the value of the
     process group ID of the new process group, which is the same as the pro-
     cess ID of the calling process.

EERRRROORRSS
     If an error occurs, sseettssiidd returns -1 and the global variable _e_r_r_n_o is
     set to indicate the error, as follows:

     [EPERM]       The calling process is already a process group leader, or
                   the process group ID of a process other than the calling
                   process matches the process ID of the calling process.

SSEEEE AALLSSOO
     setpgid(3),  tcgetpgrp(3),  tcsetpgrp(3)

SSTTAANNDDAARRDDSS
     The sseettssiidd function is expected to be compliant with the IEEE
     Std1003.1-1988 (``POSIX'') specification.

4.4BSD                           June 4, 1993                                1