pcntl_rfork
(PHP 8 >= 8.1.0)
pcntl_rfork — Manipulates process resources
Beschreibung
$flags
, int $signal
= 0): intManipulates process resources.
Parameter-Liste
-
flags
-
The
flags
parameter determines which resources of the invoking process (parent) are shared by the new process (child) or initialized to their default values.flags
is the logical OR of some subset of:-
RFPROC
: If set a new process is created; otherwise changes affect the current process. -
RFNOWAIT
: If set, the child process will be dissociated from the parent. Upon exit the child will not leave a status for the parent to collect. -
RFFDG
: If set, the invoker's file descriptor table is copied; otherwise the two processes share a single table. -
RFCFDG
: If set, the new process starts with a clean file descriptor table. Is mutually exclusive withRFFDG
. -
RFLINUXTHPN
: If set, the kernel will return SIGUSR1 instead of SIGCHILD upon thread exit for the child. This is intended to do Linux clone exit parent notification.
-
-
signal
-
The signal number.
Rückgabewerte
On success, the PID of the child process is returned in the
parent's thread of execution, and a 0
is returned in the child's
thread of execution.
On failure, a -1
will be returned in the
parent's context, no child process will be created, and a PHP error is raised.
Beispiele
Beispiel #1 pcntl_rfork() example
<?php
$pid = pcntl_rfork(RFNOWAIT|RFTSIGZMB, SIGUSR1);
if ($pid > 0) {
// This is the parent process.
var_dump($pid);
} else {
// This is the child process.
var_dump($pid);
sleep(2); // as the child does not wait, so we see its "pid"
}
?>
Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:
int(77093) int(0)
Siehe auch
- pcntl_fork() - Verzweigt den laufenden Prozess
- pcntl_waitpid() - Wartet auf ein oder gibt den Status eines abgezweigten Kindes zurück
- pcntl_signal() - Richtet eine Signalverarbeitung ein
- cli_set_process_title() - Sets the process title