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GETPGID(3P)                POSIX Programmer's Manual               GETPGID(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
       getpgid -- get the process group ID for a process
SYNOPSIS
       #include <unistd.h>
       pid_t getpgid(pid_t pid);
DESCRIPTION
       The getpgid() function shall return the process group ID of the process
       whose  process  ID  is  equal  to pid.  If pid is equal to 0, getpgid()
       shall return the process group ID of the calling process.
RETURN VALUE
       Upon successful completion, getpgid() shall return a process group  ID.
       Otherwise,  it  shall  return  (pid_t)-1  and set errno to indicate the
       error.
ERRORS
       The getpgid() function shall fail if:
       EPERM  The process whose process ID is equal to pid is not in the  same
              session  as the calling process, and the implementation does not
              allow access to the process group ID of that  process  from  the
              calling process.
       ESRCH  There is no process with a process ID equal to pid.
       The getpgid() function may fail if:
       EINVAL The value of the pid argument is invalid.
       The following sections are informative.
EXAMPLES
       None.
APPLICATION USAGE
       None.
RATIONALE
       None.
FUTURE DIRECTIONS
       None.
SEE ALSO
       exec, fork(), getpgrp(), getpid(), getsid(), 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                          GETPGID(3P)