/*********************************************************************************
 *      Copyright:  (C) 2025 LingYun IoT System Studio
 *                  All rights reserved.
 *
 *       Filename:  signal.c
 *    Description:  This file signal() example program.
 *                 
 *        Version:  1.0.0(10/28/2025)
 *         Author:  Guo Wenxue <guowenxue@gmail.com>
 *      ChangeLog:  1, Release initial version on "10/28/2025 03:14:34 PM"
 *                 
 ********************************************************************************/

#include <stdio.h>
#include <signal.h>
#include <unistd.h>

void sig_handler(int signum)
{
    switch(signum)
    {
        case SIGINT:
            printf("Received signal %d(Ctrl+C) , you can not kill me now!\n", signum);
            break;

        case SIGTERM:
            printf("Received signal %d(SIGTERM) , you can not kill me too!\n", signum);
            break;

        default:
            break;
    }
}

int main(int argc, char **argv)
{
    // 注册 SIGINT 的处理函数
    if (signal(SIGINT, sig_handler) == SIG_ERR)
    {
        perror("signal error");
        return 1;
    }

    // 注册 SIGTERM 的处理函数
    signal(SIGTERM, sig_handler);

    printf("Press Ctrl+C to trigger SIGINT\n");
    while (1)
    {
        printf("Working...\n");
        sleep(2);
    }

    return 0;
}