pcntl_signal_get_handler

(PHP 7 >= 7.1.0, PHP 8)

pcntl_signal_get_handler — Get the current handler for specified signal

说明

pcntl_signal_get_handler(int $signal): callable|int

The pcntl_signal_get_handler() function will get the current handler for the specified signal.

参数

signal: The signal number.

返回值

This function may return an integer value that refers to SIG_DFL or SIG_IGN. If a custom handler has been set, that callable is returned.

更新日志

版本	说明
7.1.0	pcntl_signal_get_handler() has been added.

示例

示例 #1 pcntl_signal_get_handler() example

<?php
var_dump(pcntl_signal_get_handler(SIGUSR1)); // Outputs: int(0)

function pcntl_test($signo) {}
pcntl_signal(SIGUSR1, 'pcntl_test');
var_dump(pcntl_signal_get_handler(SIGUSR1)); // Outputs: string(10) "pcntl_test"

pcntl_signal(SIGUSR1, SIG_DFL);
var_dump(pcntl_signal_get_handler(SIGUSR1)); // Outputs: int(0)

pcntl_signal(SIGUSR1, SIG_IGN);
var_dump(pcntl_signal_get_handler(SIGUSR1)); // Outputs: int(1)
?>

参见

pcntl_signal() - 安装信号处理程序

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用户贡献的备注 2 notes

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jrdbrndt at gmail dot com ¶

6 years ago

It is worth noting that supplying an invalid signal number will trigger a warning and return false.

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MAL ¶

3 years ago

If the signal handler is a Closure, the function itself is returned:

pcntl_signal(SIGHUP, function ($signo, $siginfo) {
    echo SIGHUP;
});

var_dump(pcntl_signal_get_handler(SIGHUP)); // Outputs: string(6) "SIGHUP"