pcntl_signal

PodrΩcznik PHP
Poprzedni		NastΩpny

Description

bool pcntl_signal ( int signo, mixed 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 pora┐ki.

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.

Przyk│ad 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:
             print "Caught SIGUSR1...\n";
             break;
         default:
             // handle all other signals
     }

}

print "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");

print "Generating signal SIGTERM to self...\n";

// send SIGUSR1 to current process id
posix_kill(posix_getpid(), SIGUSR1);

print "Done\n"

?>

Poprzedni	Spis tre╢ci	NastΩpny
pcntl_fork	Pocz▒tek rozdzia│u	pcntl_waitpid