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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 dif-
       fer (consult 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 pro-
       cess specified 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, Stan-
       dard  for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifica-
       tions Issue 6, Copyright (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 Stan-
       dard, the original IEEE and The Open Group Standard is the referee  document.  The  original  Standard  can  be
       obtained online at http://www.opengroup.org/unix/online.html .



IEEE/The Open Group                  2003                           GETSID(3P)