PCNTL 函数
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pcntl_signal

(PHP 4 >= 4.1.0, PHP 5)

pcntl_signalInstalls a signal handler

说明

bool pcntl_signal ( int $signo , callback $handler [, bool $restart_syscalls=true ] )

The pcntl_signal() function installs a new signal handler for the signal indicated by signo .

参数

signo

The signal number.

handler

The signal handler which may be the name of a user created function, or method, or either of the two global constants SIG_IGN or SIG_DFL.

Note: 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.

restart_syscalls

Specifies whether system call restarting should be used when this signal arrives and defaults to TRUE.

返回值

如果成功则返回 TRUE,失败则返回 FALSE

更新日志

版本 说明
4.3.0 The restart_syscalls parameter was added.
4.3.0 The ability to use an object method as a callback became available.
4.3.0 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).

范例

Example #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"

?>

参见


PCNTL 函数
php 手册 | 脚本学堂 | 脚本编程 | 网站编程 | 系统管理 | 服务器配置 | 数据库管理 | Php教程 | python教程 | 正则表达式 | 批处理脚本 | Centos教程 | Linux基础教程