在Qt Linux环境下编译使用libevent

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检查libevent是否安装，是则会列出清单，否则空白。
ls -al /usr/lib |grep libevent

如果没有安装，请去官网下载源文件http://libevent.org/

解压libevent-2.1.8-stable.tar.gz，tar xzvf libevent-2.1.8-stable.tar.gz

然后进入目录编译

./configure -prefix=/usr
make
make install

安装完成，会自动把相关头文件拷贝到/usr/inclue，库文件拷贝到/usr/lib。
Qt的编译环境，需要在.pro文件添加LIBS += /usr/lib/libevent.so

1、.pro文件

TEMPLATE = appCONFIG += consoleCONFIG -= app_bundleCONFIG -= qtSOURCES += main.cLIBS += /usr/lib/libevent.so

2、main.c文件

#include <sys/socket.h>#include <sys/types.h>#include <netinet/in.h>#include <stdio.h>#include <string.h>#include <event.h>#include <stdlib.h>#define PORT        8011#define BACKLOG     5#define MEM_SIZE    1024struct event_base* base;struct sock_ev{    struct event* read_ev;    struct event* write_ev;    char* buffer;};void release_sock_event(struct sock_ev* ev){    event_del(ev->read_ev);    free(ev->read_ev);    free(ev->write_ev);    free(ev->buffer);    free(ev);}void on_write(int sock, short event, void* arg){    char* buffer = (char*)arg;    send(sock, buffer, strlen(buffer), 0);    free(buffer);}void on_read(int sock, short event, void* arg){    struct event* write_ev;    int size;    struct sock_ev* ev = (struct sock_ev*)arg;    ev->buffer = (char*)malloc(MEM_SIZE);    bzero(ev->buffer, MEM_SIZE);    size = recv(sock, ev->buffer, MEM_SIZE, 0);    printf("receive data:%s, size:%d\n", ev->buffer, size);    if (size == 0)    {        release_sock_event(ev);        close(sock);        return;    }    event_set(ev->write_ev, sock, EV_WRITE, on_write, ev->buffer);    event_base_set(base, ev->write_ev);    event_add(ev->write_ev, NULL);}void on_accept(int sock, short event, void* arg){    struct sockaddr_in cli_addr;    int newfd, sin_size;    struct sock_ev* ev = (struct sock_ev*)malloc(sizeof(struct sock_ev));    ev->read_ev = (struct event*)malloc(sizeof(struct event));    ev->write_ev = (struct event*)malloc(sizeof(struct event));    sin_size = sizeof(struct sockaddr_in);    newfd = accept(sock, (struct sockaddr*)&cli_addr, &sin_size);    event_set(ev->read_ev, newfd, EV_READ|EV_PERSIST, on_read, ev);    event_base_set(base, ev->read_ev);    event_add(ev->read_ev, NULL);}int main(int argc, char* argv[]){    struct sockaddr_in my_addr;    int sock;    sock = socket(AF_INET, SOCK_STREAM, 0);    int yes = 1;    setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int));    memset(&my_addr, 0, sizeof(my_addr));    my_addr.sin_family = AF_INET;    my_addr.sin_port = htons(PORT);    my_addr.sin_addr.s_addr = INADDR_ANY;    bind(sock, (struct sockaddr*)&my_addr, sizeof(struct sockaddr));    listen(sock, BACKLOG);    struct event listen_ev;    base = event_base_new();    event_set(&listen_ev, sock, EV_READ|EV_PERSIST, on_accept, NULL);    event_base_set(base, &listen_ev);    event_add(&listen_ev, NULL);    event_base_dispatch(base);    return 0;}

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查看当前服务器的链接数
ulimit -a
lsof -p pid

参考文献：

linux网络编程
http://blog.csdn.net/feitianxuxue/article/category/1111233
linux epoll介绍和程序实例

http://blog.csdn.net/sparkliang/article/details/4770655

select、poll、epoll之间的区别总结

http://www.cnblogs.com/Anker/p/3265058.html

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