linux socket编程

 1 #include <stdio.h>
 2 #include <iostream>
 3 #include <stdlib.h>
 4 #include <errno.h>
 5 #include <string.h>
 6 #include <sys/types.h>
 7 #include <netinet/in.h>
 8 #include <sys/socket.h>
 9 #include <sys/wait.h>
10 using namespace std;
11 /* 服务器要监听的本地端口 */
12 #define MYPORT 8900
13 /* 能够同时接受多少没有 accept 的连接 */
14 #define BACKLOG 10
15 int main()
16 {
17     int sock_fd,new_fd;
18     struct sockaddr_in my_addr;
19     struct sockaddr_in their_addr;
20     socklen_t sin_size;
21     if((sock_fd=socket(AF_INET,SOCK_STREAM,0))==-1)
22     {
23         cout<<"error"<<endl;
24         exit(1);
25     }
26     my_addr.sin_family = AF_INET;
27     my_addr.sin_port = htons(MYPORT);
28     my_addr.sin_addr.s_addr = htons(INADDR_ANY);
29     bzero(&(my_addr.sin_zero),8);
30     if(bind(sock_fd,(sockaddr *)&my_addr,sizeof(sockaddr))==-1)
31     {
32         cout<<"bind error"<<endl;
33         exit(1);
34     }
35     if(listen(sock_fd,BACKLOG)==-1)
36     {
37         cout<<"listen error"<<endl;
38         exit(1);
39     }
40     while(true)
41     {
42         sin_size = sizeof(sockaddr_in);
43         if ((new_fd = accept(sock_fd, (sockaddr *)&their_addr, &sin_size)) == -1)
44         {
45           /* 如果调用 accept()出现错误，则给出错误提示，进入下一个循环 */
46             perror("accept error");
47             continue;
48          }
49         if(!fork())
50         {
51             if (send(new_fd, "Hello, world!\n",14, 0) == -1)
52             {
53                 perror("send error");
54                 close(new_fd);
55                 exit(0);
56             }
57         }
58         close(new_fd);
59 
60 
61     }
62     while(waitpid(-1,NULL,WNOHANG) > 0);
63     return 0;
64 }
65 

 1 #include <stdio.h>
 2 #include <stdlib.h>
 3 #include <errno.h>
 4 #include <string.h>
 5 #include <netdb.h>
 6 #include <sys/types.h>
 7 #include <netinet/in.h>
 8 #include <sys/socket.h>
 9 #include <iostream>
10 using namespace std;
11 /* 服务器程序监听的端口号 */
12 #define MYPORT 8900
13 /* 我们一次所能够接收的最大字节数 */
14 #define MAXDATASIZE 100
15 int main() {
16     char buffer[MAXDATASIZE];
17     int sock_fd;
18     struct sockaddr_in their_addr;
19     if ((sock_fd = socket(AF_INET,SOCK_STREAM, 0)) == -1) {
20         cout << "error" << endl;
21         exit(1);
22     }
23     their_addr.sin_family = AF_INET;
24     their_addr.sin_port = htons(MYPORT);
25     their_addr.sin_addr.s_addr = htons(INADDR_ANY);
26     bzero(&(their_addr.sin_zero), 8);
27     if(connect(sock_fd,(struct sockaddr *)&their_addr, sizeof(struct sockaddr)) == -1)
28     {
29         perror("connect");
30         exit(1);
31     }
32     int numberSize = 0;
33     if((numberSize=recv(sock_fd,buffer,MAXDATASIZE,0))==-1)
34     {
35         perror("error");
36         exit(1);
37     }
38     buffer[numberSize] = '\0';
39     cout<<buffer<<endl;
40 
41     return 0;
42 }
43 
44