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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 differ (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 process 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 -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 POSIX.1-2008, <unistd.h>
COPYRIGHT
       Portions  of  this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri-
       cal  and  Electronics  Engineers,  Inc  and  The  Open Group.  (This is
       POSIX.1-2008 with the 2013 Technical Corrigendum  1  applied.)  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.unix.org/online.html .
       Any typographical or formatting errors that appear  in  this  page  are
       most likely to have been introduced during the conversion of the source
       files to man page format. To report such errors,  see  https://www.ker-
       nel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group                  2013                           GETSID(3P)