linux 信号处理

test_signal/makefile

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+test_signal:test_signal.cpp
+	g++ $^ -o $@ -levent

test_signal/test_signal.cpp

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+#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;
+
+}