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
Descripción
pcntl_getpriority() gets the priority of
process_id. Because priority levels can differ between
system types and kernel versions, please see your system's getpriority(2)
man page for specific details.
Parámetros
-
process_id -
If
null, the process id of the current process is used. -
mode -
One of
PRIO_PGRP,PRIO_USER,PRIO_PROCESS,PRIO_DARWIN_BGorPRIO_DARWIN_THREAD.
Valores devueltos
pcntl_getpriority() returns the priority of the process
or false on error. A lower numerical value causes more favorable
scheduling.
Advertencia
Esta función puede
devolver el valor booleano false, pero también puede devolver un valor no booleano que se
evalúa como false. Por favor lea la sección sobre Booleanos para más
información. Use el operador
=== para comprobar el valor devuelto por esta
función.
Historial de cambios
| Versión | Descripción |
|---|---|
| 8.0.0 |
process_id is nullable now.
|
add a note
User Contributed Notes 1 note
jonathan at jcdesigns dot com ¶
16 years ago
