汇编指令合集

用select实现服务器并发代码

#include<myhead.h>
#define IP "192.168.0.106"
#define PORT 8888int main(int argc, const char *argv[])
{//新建套接字文件int sfd = socket(AF_INET, SOCK_STREAM, 0);if(sfd < 0){ERR_MSG("socket");return -1;}printf("socket success\n");//允许端口快速的被复用int reuse = 1;if(setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse)) < 0){ERR_MSG("setsockopt");return -1;}printf("port reuse enable\n");//填充地址信息结构体struct sockaddr_in sin;sin.sin_family = AF_INET;sin.sin_addr.s_addr = inet_addr(IP);sin.sin_port = htons(PORT);//bind函数绑定地址if(bind(sfd, (struct sockaddr*)&sin, sizeof(sin)) < 0){ERR_MSG("bind");return -1;}printf("bind success\n");//设置sfd为监听套接字if(listen(sfd, 128) < 0){ERR_MSG("listen");return -1;}printf("listen success\n");fd_set readfds, tempfds; //定义文件描述符集合FD_ZERO(&readfds);       //清空readfdsFD_SET(0, &readfds);     //将文件描述符0添加到集合中FD_SET(sfd, &readfds);   //将文件描述符sfd添加到集合中int maxfd = sfd;         //定义最大文件描述符char buf[128] = "";      //定义容器存放字符串struct sockaddr_in cin;  //定义地址结构体存放accept所接收到的客户端的地址信息socklen_t cin_len = sizeof(cin); //定义结构体大小ssize_t rcv_len = -1;    //定义接收的字节大小struct sockaddr_in savecin[1024];//定义存放客户端信息的结构体数组,每有一个cin被接受,\都会存入下标为newfd的数组中while(1){tempfds = readfds;if(select(maxfd+1, &tempfds, NULL, NULL, NULL) < 0){ERR_MSG("select");return -1;}for(int i=0; i<=maxfd; i++) //遍历文件描述符，若有文件描述符就绪，则运行对应的处理函数{if((FD_ISSET(i, &tempfds)) == 0){continue;}if(0 == i){printf("触发键盘输入事件\n");bzero(buf, sizeof(buf));fgets(buf, sizeof(buf), stdin);buf[strlen(buf)-1] = '\0';printf("你输入了%s\n", buf);}else if(sfd == i){printf("触发客户端连接事件\n");//执行accept函数int newfd = accept(sfd, (struct sockaddr*)&cin, &cin_len);if(newfd < 0){ERR_MSG("accept");break;}printf("client[%s:%d] connected newfd = %d\n", inet_ntoa(cin.sin_addr),\ntohs(cin.sin_port), newfd);FD_SET(newfd ,&readfds); //将accept函数创建的newfd加入到readfds集合中savecin[newfd] = cin;maxfd = maxfd>newfd?maxfd:newfd; //更新maxfd的值}else //当文件描述符不是sfd和0时,进行客户端交互事件{printf("触发客户端交互事件\n");bzero(buf, sizeof(buf)); //清空buf防止有残留数据//接受数据rcv_len = recv(i, buf, sizeof(buf), 0);if(rcv_len < 0){ERR_MSG("recv");break;}else if(rcv_len == 0){printf("客户端已下线\n");close(i);            //关闭与该客户端交互的对应的文件描述符FD_CLR(i, &readfds); //将该文件描述符从集合中踢出//更新maxfdfor(; maxfd>=sfd; maxfd--){if(FD_ISSET(maxfd, &readfds)){break;}}break;}else{printf("client[%s:%d] rcvdata = %s newfd = %d\n",\inet_ntoa(savecin[i].sin_addr),\ntohs(savecin[i].sin_port), buf, i);}//发送数据strcat(buf, ">_<");if(send(i, buf, sizeof(buf), 0) < 0){ERR_MSG("send");break;}printf("send success data = %s\n", buf);}}}if(close(sfd) < 0){ERR_MSG("close");return -1;}return 0;
}