GETSID(3P)                                          POSIX Programmer's Manual                                         GETSID(3P)



PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (con-
       sult the corresponding Linux manual page for details of Linux behavior), or the  interface  may  not  be  implemented  on
       Linux.

NAME
       getsid - get the process group ID of a session leader

SYNOPSIS
       #include <unistd.h>

       pid_t getsid(pid_t pid);


DESCRIPTION
       The  getsid()  function shall obtain the process group ID of the process that is the session leader of the process speci-
       fied by pid. If pid is (pid_t)0, it specifies the calling process.

RETURN VALUE
       Upon successful completion, getsid() shall return the process group ID of the session leader of  the  specified  process.
       Otherwise, it shall return (pid_t)-1 and set errno to indicate the error.

ERRORS
       The getsid() function shall fail if:

       EPERM  The  process  specified  by pid is not in the same session as the calling process, and the implementation does not
              allow access to the process group ID of the session leader of that process from the calling process.

       ESRCH  There is no process with a process ID equal to pid.


       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       exec(), fork(), getpid(), getpgid(), setpgid(), setsid(), the Base Definitions volume of IEEE Std 1003.1-2001, <unistd.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003  Edition,  Standard  for
       Information  Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copy-
       right (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any
       discrepancy  between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group
       Standard  is  the  referee   document.   The   original   Standard   can   be   obtained   online   at   http://www.open-
       group.org/unix/online.html .



IEEE/The Open Group                                           2003                                                    GETSID(3P)