如何触发SIGUSR1和SIGUSR2？ [英] How to trigger SIGUSR1 and SIGUSR2?

问题描述

我越来越有信号熟悉C语言我想不出有什么样的信号 SIGUSR1 和 SIGUSR2 是，我怎么能触发它们。任何人都可以请解释一下？

I'm getting acquainted with signals in C. I can't figure out what kind of signals SIGUSR1 and SIGUSR2 are and how can I trigger them. Can anyone please explain it to me?

推荐答案

它们的用户定义的信号，使它们不被任何特定的动作触发。你可以明确地编程方式发送它们：

They are user-defined signals, so they aren't triggered by any particular action. You can explicitly send them programmatically:

#include <signal.h>

kill(pid, SIGUSR1);

其中， PID 是接收进程的进程ID。在接收端，你能为他们注册一个信号处理程序：

where pid is the process id of the receiving process. At the receiving end, you can register a signal handler for them:

#include <signal.h>

void my_handler(int signum)
{
    if (signum == SIGUSR1)
    {
        printf("Received SIGUSR1!\n");
    }
}

signal(SIGUSR1, my_handler);

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