GETPGID
Section: POSIX Programmer's Manual (3P)
Updated: 2017
Page Index
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.1-2017,
<unistd.h>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1-2017, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 7, 2018 Edition,
Copyright (C) 2018 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.opengroup.org/unix/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.kernel.org/doc/man-pages/reporting_bugs.html .