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posix_getpgid
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posix_getpgid

Name

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

Synopsis

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

Returns

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

Description

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() ).

Warning

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.

Warning

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

Version

PHP 3.0.10+, PHP 4.0b4+

Example

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";
}

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