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并发服务器就是能够同时处理多个客户端请求的服务器。并发服务器可通过多进程或者多线程程序来实现，这里采用多进程程序。
#include#include #include #include #include #include #include /*定义了struct sockaddr_in*/void main(){ int sockfd; /*创建socket*/ sockfd=socket(AF_INET,SOCK_STREAM,0); if(sockfd==-1) { printf("create socket false"); exit(1); } /*绑定地址*/ struct sockaddr_in server_addr; server_addr.sin_family=AF_INET; server_addr.sin_port=htons(5000); server_addr.sin_addr.s_addr=htonl(INADDR_ANY); if(bind(sockfd,(const struct sockaddr *)(&server_addr),sizeof(server_addr))==-1) { printf("bind false"); exit(1); } /*监听端口*/ listen(sockfd,3); /*父进程等待连接，成功连接后创建子进程收发数据*/ int newfd; struct sockaddr_in client_addr; int addrlen=sizeof(client_addr); char buf[128]; pid_t pid; while(1) { newfd=accept(sockfd,(struct sockaddr *)(&client_addr),&addrlen); pid=fork(); if(pid==0) { while(1) { recv(newfd,buf,128,0); printf("the message is from :%s\n",inet_ntoa(client_addr.sin_addr)); printf("the message received is %s\n",buf); if(strcmp(buf,"exit")==0) { break; } } close(newfd); close(sockfd); exit(0); } } /*结束连接*/ close(newfd); close(sockfd);}
#include#include #include #include #include #include #include /*定义了struct sockaddr_in*/void main(){ /*创建socket*/ int sockfd=socket(AF_INET,SOCK_STREAM,0); if(sockfd==-1) { printf("create socket false"); exit(1); } /*连接服务器*/ struct sockaddr_in server_addr; server_addr.sin_family=AF_INET; server_addr.sin_port=htons(5000); server_addr.sin_addr.s_addr=inet_addr("192.168.137.246"); if(connect(sockfd,(const struct sockaddr *)(&server_addr),sizeof(server_addr))==-1) { printf("connect false"); exit(1); } /*收发数据*/ printf("please enter your message,and exit for exit\n"); char buf[128]; while(1) { scanf("%s",buf); send(sockfd,buf,128,0); if(strcmp(buf,"exit")==0) break; } /*结束连接*/ close(sockfd);}
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