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PHP. Руководство по PHP. 2005

pcntl_signal

pcntl_signal

(PHP 4 >= 4.1.0, PHP 5)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.

Возвращает TRUE в случае успешного завершения или FALSE в случае возникновения ошибки.

Замечание:

The optional restart_syscalls parameter became

available in PHP 4.3.0.

Замечание:

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.

Пример 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"

?>

Замечание:

As of PHP 4.3.0 PCNTL uses ticks as the signal handle callback mechanism,

which is much faster than the previous mechanism. This change follows the

same semantics as using

"user ticks". You

must use the declare()

statement to specify the locations in your program where callbacks are

allowed to occur for the signal handler to function properly (as used in

the above example).

See also pcntl_fork() and

pcntl_waitpid().

pcntl_setpriority

Уровень выше

pcntl_wait

Отвечу на любые вопросы. С уважением, Дмитрий Владимирович.

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