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posix_getpgid — Return the process group ID of a given process (SysV 4)


int posix_getpgid(pid);
int pid: Process ID of process to examine


The process group ID of the specified process, or FALSE on failure.


This function returns the process group ID of the process identified by pid . If pid is 0, the process group of the current process will be returned (equivalent to a call to posix_getpgrp() ).


This is not actually a POSIX function and may not be supported on all systems. On unsupported systems, FALSE will always be returned. It should be supported on most BSD and SysV style systems, such as Linux and FreeBSD.


There was a bug in PHP 3.0.10 and PHP 4.0.6 and earlier which caused this function to always return FALSE.


PHP 3.0.10+, PHP 4.0b4+


Example 1072. Getting the process group ID for a process

/* 498 is the PID of the portmapper on the author's system. */
if (FALSE === ($pgid = posix_getpgid(498))) {
    echo "Could not get pgid.\n";
} else {
    echo "Portmapper process group ID: $pgid\n";

/* Get the process group of the current PHP process. */
if (FALSE === ($pgid = posix_getpgid(0))) {
    echo "Could not get pgid.\n";
} else {
    echo "PHP's process group ID: $pgid\n";

PHP Functions Essential Reference. Copyright © 2002 by New Riders Publishing (Authors: Zak Greant, Graeme Merrall, Torben Wilson, Brett Michlitsch). This material may be distributed only subject to the terms and conditions set forth in the Open Publication License, v1.0 or later (the latest version is presently available at The authors of this book have elected not to choose any options under the OPL. This online book was obtained from and is designed to provide information about the PHP programming language, focusing on PHP version 4.0.4 for the most part. The information is provided on an as-is basis, and no warranty or fitness is implied. All persons and entities shall have neither liability nor responsibility to any person or entity with respect to any loss or damage arising from the information contained in this book.

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