10-11-12 IO复用及select例子

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1. 阻塞式IO

2. 非阻塞式IO

3. IO复用Select ／ epoll

4. 信号驱动IO

5. 异步IO

6. select示例

#include "socket_includes.h"int mz_ipv4_tcp_create_socket(void){int listenfd, sockfd, opt = 1;struct sockaddr_in server, client;socklen_t len;int timep;int ret;listenfd = socket(AF_INET, SOCK_STREAM, 0);if(listenfd < 0){perror("Create socket fail.");return -1;} if((ret = setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt))) < 0){perror("Error, set socket reuse addr failed");  return -1;}bzero(&server, sizeof(server));server.sin_family = AF_INET;server.sin_port   = htons(SERV_PORT);server.sin_addr.s_addr  = htonl(INADDR_ANY);len = sizeof(struct sockaddr);if(bind(listenfd, (struct sockaddr *)&server, len)<0){  perror("bind error.");return -1;}  listen(listenfd, MAX_LISTEN_QUE);return listenfd;}int main(int argc, char *argv[]){int listenfd, sockfd;struct sockaddr_in server, client;socklen_t len;int bytes =0 ;fd_set global_rdfs,current_rdfs;int maxfd;int i;char buf[MAX_BUFFER_SIZE];len = sizeof(struct sockaddr_in);listenfd = mz_ipv4_tcp_create_socket();FD_ZERO(&global_rdfs);FD_SET(listenfd, &global_rdfs);maxfd = listenfd;while(1){current_rdfs = global_rdfs;if(select(maxfd + 1, ¤t_rdfs, NULL, NULL, NULL)<0){perror("select error.\n");return RT_ERR;}for(i = 0; i <= maxfd; i++){if(FD_ISSET(i, ¤t_rdfs)){if(listenfd == i){if((sockfd = accept(listenfd, (struct sockaddr*)&client, (socklen_t*)&len))<0){perror("accept error.\n");return RT_ERR;}printf("sockfd:%d\n", sockfd);FD_CLR(i, ¤t_rdfs);maxfd = maxfd > sockfd ? maxfd :sockfd;FD_SET(sockfd, &global_rdfs);}else{printf("read socket:%d\n", i);bytes = recv(i, buf, MAX_BUFFER_SIZE, 0);if(bytes < 0){perror("recv error.\n");return RT_ERR;}if(bytes == 0){FD_CLR(i, &global_rdfs);close(i);continue;}printf("buf:%s\n", buf);send(i, buf, strlen(buf), 0);}}}}}

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