libevent_study/test_signal/test_signal.cpp

#include <iostream>
#include <event2/event.h>
#include <signal.h>

using namespace std;

//sock 文件描述符  which 事件类型 arg传递的参数
static void Ctrl_C(int sock,short which , void* arg){
    cout << "Ctrl_C" << endl;
}

static void Kill(int sock,short which , void* arg){
    cout << "Kill" << endl;
    
    event *ev = (event*)arg;
    //如果处于非待决
    if(!evsignal_pending(ev,NULL)){
        event_del(ev);
        event_add(ev,NULL); //再次添加进来
    }
}

int main(int agrc,char** agrv){

    event_base *base = event_base_new();

    //添加信号 ctrl+c ,处于no pending 状态
    //evsignal_new 隐藏的状态 EV_SIGNAL|EV_PERSIST
    event *csig = evsignal_new(base,SIGINT,Ctrl_C,base);

    if(!csig){
        cerr << "SIGNAL evsignal_new failed!" << endl;
        return -1;
    }

    if (event_add(csig,0) != 0){
        cerr << "SIGANL event_add failed" << endl;
    }

    //添加kill信号
    //非持久事件，只进入一次 event_self_cbarg()传递当前的event
    event *ksig = event_new(base,SIGTERM,EV_SIGNAL,Kill,
        event_self_cbarg());

    if(!ksig){
        cerr << "SIGNAL evsignal_new failed!" << endl;
        return -1;
    }

    if (event_add(ksig,0) != 0){
        cerr << "SIGANL event_add failed" << endl;
    }
    //进入事件主循环
    event_base_dispatch(base);
    event_free(csig);
    event_base_free(base);
   
    return 0;

}