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 (con-
       sult 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 implemen-
              tation 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  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                                                   GETPGID(3P)