NAME    [Toc]    [Back]

     setsid - create session and set process group ID

SYNOPSIS    [Toc]    [Back]

     #include <unistd.h>

     pid_t
     setsid(void);

DESCRIPTION    [Toc]    [Back]

     The setsid 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 setsid function returns  the
value of the
     process group ID of the new process group, which is the same
as the process
 ID of the calling process.

ERRORS    [Toc]    [Back]

     If an error occurs, setsid returns -1 and the  global  variable errno 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.

SEE ALSO    [Toc]    [Back]

     getsid(2), setpgid(2), tcgetpgrp(3), tcsetpgrp(3)

STANDARDS    [Toc]    [Back]

     The setsid function is expected to  be  compliant  with  the
IEEE Std
     1003.1-1988 (``POSIX'') specification.

OpenBSD      3.6                           June      4,      1993