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.
NAMEgetpgid — get the process group ID for a process
pid_t getpgid(pid_t pid);
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.
Upon successful completion, getpgid() shall return a process group ID.
Otherwise, it shall return (pid_t)−1 and set errno to indicate the
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
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.
exec, fork(), getpgrp(), getpid(), getsid(), setpgid(), setsid()
The Base Definitions volume of POSIX.1‐2008, <unistd.h>
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
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IEEE/The Open Group 2013 GETPGID(3P)