This function is ideal for checking if a given process is running, I have seen solutions that involve running the system utilites like PS and parsing the answer, which should work fine, but this allows you to check a given PID with a single call
function CheckPID( $PID )
{
// Check if the passed in PID represents a vlaid process in the system
// Returns true if it does
// Turn off non-fatal runtime warning for a moment as we know we
// will get one if the PID does not represent a valid process
$oldErrorLevel = error_reporting(0);
error_reporting( $oldErrorLevel & ~E_WARNING );
$res = pcntl_getpriority($PID);
error_reporting( $oldErrorLevel);
return ! ( $res === false);
}
pcntl_getpriority
(PHP 5, PHP 7, PHP 8)
pcntl_getpriority — Get the priority of any process
Description
pcntl_getpriority(int
$pid = getmypid(), int $process_identifier = PRIO_PROCESS): int
pcntl_getpriority() gets the priority of
pid. Because priority levels can differ between
system types and kernel versions, please see your system's getpriority(2)
man page for specific details.
Parameters
-
pid -
If not specified, the pid of the current process is used.
-
process_identifier -
One of
PRIO_PGRP,PRIO_USERorPRIO_PROCESS.
Return Values
pcntl_getpriority() returns the priority of the process
or false on error. A lower numerical value causes more favorable
scheduling.
Warning
This function may
return Boolean false, but may also return a non-Boolean value which
evaluates to false. Please read the section on Booleans for more
information. Use the ===
operator for testing the return value of this
function.
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User Contributed Notes 1 note
jonathan at jcdesigns dot com ¶
15 years ago
