并发服务器设计

 1 #include <stdio.h>
 2 #include <sys/socket.h>
 3 #include <string.h>
 4 #include <netinet/in.h>
 5 
 6 #define portnum 3333
 7 
 8 int main()
 9 {
10     int sockfd ,new_fd;
11     struct sockaddr_in server_addr;
12     struct sockaddr_in client_addr;
13     char buffer[128];
14     int nbyte;
15     int sin_size;
16     int pid;
17     //创建套接字
18     if((sockfd = socket(AF_INET,SOCK_STREAM,0))== -1)
19     {
20         printf("create socket error.\n");
21         exit(1);
22     }
23     //2.1设置要绑定的地址
24     bzero(&server_addr,sizeof(struct sockaddr_in));
25     sockaddr_in.sin_family = AF_INET;
26     sockaddr_in.sin_port = htons(portnum);//客户机转为网络字符序
27     sockaddr_in.sin_addr.s_addr = htonl(INADDR_ANY);//客户机转为网络字符序
28     //2.2绑定地址
29     bind(sockfd,(struct sockaddr *)(&server_addr),sizeof(struct sockaddr));
30     //3.监听端口
31     listen(sockfd,5);
32     while(1)
33     {
34         //4.等待连接
35         sin_size = sizeof(struct sockaddr);
36         new_fd = accept(sockfd,(struct sockaddr *)(&client_addr),&sin_size);
37         printf("server get connection from %s\n",inet_ntoa(client_addr.sin_addr));
38 
39         //由子进程来处理数据通讯
40         if(pid = fork() == 0)
41         {
42             //5.接收数据
43             nbyte = recv(new_fd,buffer,128,0);
44             buffer[nbyte]=‘\0‘;
45             printf("server received : %s\n",buffer);
46 
47             close(new_fd);
48             close(sockfd);
49             exit(0);
50         }
51         else if(pid <0)
52         {
53             printf("fork error!\n");
54         }
55         //6.结束连接
56         colse(new_fd);
57 
58     }
59     close(sockfd);
60     
61     return 0;
62 }

 1 #include <stdio.h>
 2 #include <string.h>
 3 #include <sys/socket.h>
 4 #include <netinet/in.h>
 5 
 6 #define portnum 3333
 7 
 8 int main()
 9 {
10     struct sockaddr_in server_addr;
11     int sockfd;
12     char buffer[128];
13 
14     //1.创建套接字
15     if((sockfd = socket(AF_INET,SOCK_STREAM,0)) == -1)
16     {
17         printf("create socket error.\n");
18         exit(1);
19     }
20     //2.1设置要链接的服务器的地址
21     bzero(&server_addr,sizeof(struct sockaddr_in));
22     server_addr.sin_family = AF_INET;
23     server_addr.sin_port = htons(portnum);
24     server_addr.sin_addr.s_addr = inet_addr("192.168.1.113");//服务器IP地址
25     //2.链接服务器
26     if(connect(sockfd,(struct sockaddr *)(&server_addr),sizeof(struct sockaddr)) == -1)
27     {
28         printf("connect error.\n");
29         exit(1);
30     }
31     //3.发送数据到服务器
32     printf("Please input char:\n");
33     fgets(buffer,128,stdin);
34     send(sockfd,buffer,strlen(buffer),0);
35     //4.关闭连接
36     close(sockfd);
37 
38     return 0;
39 }