Examples
This example forks off a daemon process with a signal handler.
Example 1. Process Control Example
<?php
declare(ticks=1);
$pid = pcntl_fork();
if ($pid == -1) {
die("could not fork");
} else if ($pid) {
exit(); // we are the parent
} else {
// we are the child
}
// detatch from the controlling terminal
if (!posix_setsid()) {
die("could not detach from terminal");
}
// setup signal handlers
pcntl_signal(SIGTERM, "sig_handler");
pcntl_signal(SIGHUP, "sig_handler");
// loop forever performing tasks
while (1) {
// do something interesting here
}
function sig_handler($signo)
{
switch ($signo) {
case SIGTERM:
// handle shutdown tasks
exit;
break;
case SIGHUP:
// handle restart tasks
break;
default:
// handle all other signals
}
}
?>
See Also
A look at the section about POSIX functions may be useful.
Table of Contents
pcntl_alarm -- Set an alarm clock for delivery of a signal
pcntl_exec -- Executes specified program in current process
space
pcntl_fork -- Forks the currently running process
pcntl_getpriority -- Get the priority of any process
pcntl_setpriority -- Change the priority of any process
pcntl_signal -- Installs a signal handler
pcntl_wait -- Waits on or returns the status of a forked
child
pcntl_waitpid -- Waits on or returns the status of a forked
child
pcntl_wexitstatus -- Returns the return code of a terminated
child
pcntl_wifexited -- Returns TRUE if status code represents
a successful exit
pcntl_wifsignaled -- Returns TRUE if status code represents
a termination due to a signal
pcntl_wifstopped -- Returns TRUE if child process is currently
stopped
pcntl_wstopsig -- Returns the signal which caused the child
to stop
pcntl_wtermsig -- Returns the signal which caused the child
to terminate
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