linux 网络编程---->多客户请求服务器， C/S 实例—转

注意：可以开启一个server和多个client，同时可以对server进行发送data处理,请注意client的参数，格式是：./client IP char_data

IP：就是server所在的IP，char_data就是发送的数据

server.c

  1 #include<sys/types.h>
  2 #include<sys/socket.h>
  3 #include<strings.h>
  4 #include<arpa/inet.h>
  5 #include<unistd.h>
  6 #include<stdlib.h>
  7 #include<stdio.h>
  8 #include<string.h>
  9 #include<errno.h>
 10 #include<signal.h>
 11 #include<sys/wait.h>
 12 
 13 #define   
 14   LISTEN_PORT  6000        //!> 端口
 15 #define    MAX               5            //!> 最大的等待请求数目
 16 
 17 void str_echo( int sockfd)                //!> 从client中读取数据
 18 {
 19    ssize_t       n;
 20     charline[512];
 21    
 22    printf("准备读数据：");
 23    
 24     while( 1)
 25     {
 26        while( ( n =read( sockfd, line, 512 ) ) > 0)      //!> 注意是：根据accept得到的client的操作描述符来处理的呗～
 27        {
 28           line[n] ='\0';
 29          printf("Client  send: %s\n", line );
 30           bzero(&line, sizeof( line ));      //!> 再次置NULL
 31        }
 32     }
 33 }
 34 
 35 int main( int argc, char ** argv )
 36 {
 37     int             listenfd,connfd;      //!> 描述符
 38    pid_t         childpid;            //!> 子进程号
 39    socklen_t      chilen;               //!>
 40    
 41     structsockaddr_in chiaddr, servaddr;
 42    
 43    //!> 建立socket( TCP )
 44    //!>
 45     if( (listenfd = socket( AF_INET, SOCK_STREAM, 0 ) ) == -1 )
 46     {
 47       printf("socket error... :  %s\n",(char*)strerror(errno));
 48        exit(EXIT_FAILURE );
 49     }
 50    
 51    //!> socket参数
 52    //!>
 53    servaddr.sin_family =AF_INET;                  //!> 协议族
 54    servaddr.sin_port = htons( LISTEN_PORT);      //!> IP
 55    servaddr.sin_addr.s_addr =INADDR_ANY;      //!> 本机IP
 56     bzero(&( servaddr.sin_zero ), 8);               //!> 8字节填充字符
 57 
 58    //!> 绑定IP和端口
 59    //!>
 60     if( bind(listenfd, ( struct sockaddr * )&servaddr, sizeof(servaddr ) ) == -1 )
 61     {
 62       printf("bind失败\n");
 63        exit(EXIT_FAILURE );
 64     }
 65 
 66    //!> 下面开始监听
 67    //!>   
 68     if( listen(listenfd, MAX ) == -1 )
 69     {
 70       printf("listen error...");
 71        exit(EXIT_FAILURE );
 72     }
 73    
 74     while( 1)
 75     {
 76        chilen =sizeof( chiaddr );
 77       
 78       //!> 等待连接
 79       //!>
 80        if( ( connfd= accept( listenfd, ( struct sockaddr* )&chiaddr,&chilen ) ) == -1 )
 81        {
 82          printf("accept error...\n");
 83           exit(EXIT_FAILURE );
 84        }
 85        else
 86        {
 87          printf("client连接成功！\n");
 88       }      
 89       
 90       //!> 创建子进程来处理请求
 91       //!>
 92        if( (childpid = fork() ) == 0 )
 93        {
 94           close(listenfd );            //!> server关闭与其链接，交给子进程处理
 95          printf("Client from %s\n", inet_ntoa( chiaddr.sin_addr ));
 96           str_echo(connfd );
 97           exit(EXIT_SUCCESS );
 98        }
 99        else if(childpid < 0 )
100        {
101           printf("forkerror...\n");
102           close(connfd );
103           exit(EXIT_FAILURE );
104        }
105       
106        close(connfd );
107     }
108    
109     return0;
110 }

client.c

 1 #include<sys/types.h>
 2 #include<stdlib.h>
 3 #include<stdio.h>
 4 #include<unistd.h>
 5 #include<sys/socket.h>
 6 #include<strings.h>
 7 #include<string.h>
 8 #include<arpa/inet.h>
 9 #include<errno.h>
10 
11 #define    SERVER_PORT   6000
12 
13 void str_cli( char * data, int sockfd)            //!> 此处是client发送消息而已
14 {   
15     while( 1)
16     {
17        write(sockfd, data, strlen( data ) );
18        sleep( 1);
19     }
20    
21     exit( 0);
22 }
23 
24 int main( int argc, char ** argv )
25 {
26     intsockfd;
27     structsockaddr_in servaddr;
28    
29     if( argc !=3 )
30     {
31       printf("输入参数！\n");
32        exit(EXIT_FAILURE );
33     }
34    
35     if( ( sockfd= socket( AF_INET, SOCK_STREAM, 0 ) ) == -1 )
36     {
37       printf("socket error...\n");
38        exit(EXIT_FAILURE );
39     }
40    
41     bzero(&servaddr, sizeof( servaddr ) );
42    servaddr.sin_family = AF_INET;
43    servaddr.sin_port = htons( SERVER_PORT );
44     inet_pton(AF_INET, argv[1], &servaddr.sin_addr);      //!> 需要自己写入IP 作为第一个参数
45 
46    printf("Client connecting...\n");
47    
48     if( connect(sockfd, ( struct sockaddr * )&servaddr, sizeof(servaddr ) ) == -1 )
49     {
50       printf("connect error..\n");
51        exit(EXIT_FAILURE );
52     }
53    
54    printf("开始发送data：\n");
55     str_cli(argv[2], sockfd );
56 
57     return0;
58 }

makefile:

 1 all: server client
 2 
 3 server:
 4     gcc -W-o  server server.c
 5    
 6    
 7 client:   
 8    gcc  -W -o client client.c
 9    
10    
11 clean:
12     rm -f serverclient