DragonOS/user/apps/c_unitest/test_signal.c

/**
 * @file main.c
 * @author longjin (longjin@RinGoTek.cn)
 * @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;
}