DragonOS/user/apps/test_signal/main.c

/**
 * @file main.c
 * @author longjin ([email protected])
 * @brief 测试signal用的程序
 * @version 0.1
 * @date 2022-12-06
 *
 * @copyright Copyright (c) 2022
 *
 */

/**
 * 测试signal的kill命令的方法:
 * 1.在DragonOS的控制台输入 exec bin/test_signal.elf &
 *      请注意,一定要输入末尾的 '&',否则进程不会后台运行
 * 2.然后kill对应的进程的pid (上一条命令执行后,将会输出这样一行:"[1] 生成的pid")
 *
 */

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

bool handle_ok = false;
int count = 0;
void handler(int sig)
{
    printf("handle %d\n", sig);
    handle_ok = true;
    count++;
}

int main()
{
    signal(SIGKILL, &handler);
    printf("registered.\n");

    while (1)
    {
        // handler(SIGKILL);
        printf("Test signal running\n");
        raise(SIGKILL);
        if (handle_ok)
        {
            printf("Handle OK!\n");
            handle_ok = false;
        }
        if (count > 0)
        {
            signal(SIGKILL, SIG_DFL);
        }
    }

    return 0;
}