Podręcznik PHP
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# pcntl_signal

(PHP 4 >= 4.1.0)

pcntl_signal -- Installs a signal handler

## Description

bool pcntl_signal ( int signo, callback handle [, bool restart_syscalls])

The pcntl_signal() function installs a new signal handler for the signal indicated by `signo`. The signal handler is set to `handler` which may be the name of a user created function, or either of the two global constants SIG_IGN or SIG_DFL. The optional `restart_syscalls` specifies whether system call restarting should be used when this signal arrives and defaults to `TRUE`.

Zwraca `TRUE` w przypadku sukcesu, `FALSE` w przypadku porażki.

> Notatka: The optional `restart_syscalls` parameter became available in PHP 4.3.0.

> Notatka: The ability to use an object method as a callback became available in PHP 4.3.0. Note that when you set a handler to an object method, that object's reference count is increased which makes it persist until you either change the handler to something else, or your script ends.

Przykład 1. pcntl_signal() example

`<?php
// tick use required as of PHP 4.3.0
declare(ticks = 1);
// signal handler function
function sig_handler($signo)
{
switch ($signo) {
case SIGTERM:
// handle shutdown tasks
exit;
break;
case SIGHUP:
// handle restart tasks
break;
case SIGUSR1:
echo "Caught SIGUSR1...\n";
break;
default:
// handle all other signals
}
}
echo "Installing signal handler...\n";
// setup signal handlers
pcntl_signal(SIGTERM, "sig_handler");
pcntl_signal(SIGHUP, "sig_handler");
pcntl_signal(SIGUSR1, "sig_handler");
// or use an object, available as of PHP 4.3.0
// pcntl_signal(SIGUSR1, array($obj, "do_something");
echo"Generating signal SIGTERM to self...\n";
// send SIGUSR1 to current process id
posix_kill(posix_getpid(), SIGUSR1);
echo "Done\n"
?>`

See also pcntl_fork() and pcntl_waitpid().

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pcntl_fork | Początek rozdziału | pcntl_waitpid