linux 进程 唤醒 检测

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

void signal_handler(int signum) {
    printf("Received signal %d, waking up...\n", signum);
}

int main() {
    // 注册信号处理函数
    signal(SIGUSR1, signal_handler);

    printf("Process is waiting for signal...\n");
    pause(); // 进入阻塞状态，等待信号

    printf("Process has been woken up!\n");
    return 0;
}

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

void timer_handler(int signum) {
    printf("Timer expired, waking up...\n");
}

int main() {
    struct sigaction sa;
    struct itimerspec its;

    // 设置信号处理函数
    sa.sa_handler = &timer_handler;
    sigemptyset(&sa.sa_mask);
    sa.sa_flags = 0;
    sigaction(SIGALRM, &sa, NULL);

    // 配置定时器
    its.it_value.tv_sec = 5; // 初始到期时间（秒）
    its.it_value.tv_nsec = 0;
    its.it_interval.tv_sec = 0; // 重复间隔时间（秒）
    its.it_interval.tv_nsec = 0;

    timer_t timerid;
    timer_create(CLOCK_REALTIME, NULL, &timerid);
    timer_settime(timerid, 0, &its, NULL);

    printf("Process is waiting for timer...\n");
    pause(); // 进入阻塞状态，等待定时器到期

    printf("Process has been woken up by timer!\n");
    return 0;
}