server.c

是在linux下的一个网络通行的简单程序 先运行server 再运行client

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/wait.h>
#define SERVPORT 3333 
#define BACKLOG 10
main()
{
 int sockfd,client_fd;
 struct sockaddr_in my_addr;  
 struct sockaddr_in remote_addr;  

 if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
 perror( "socket creat wrong!"); exit(1);
 } 

 my_addr.sin_family=AF_INET; 
 my_addr.sin_port=htons(SERVPORT); 
 my_addr.sin_addr.s_addr = INADDR_ANY; 
 bzero( &(my_addr.sin_zero),8);

 if (bind(sockfd, (struct sockaddr *) &my_addr, sizeof(struct sockaddr)) == -1) {
 perror( "bind wrong");
 exit(1); 
 } 

 if (listen(sockfd, BACKLOG) == -1) { 
 perror( "listen wrong");
 exit(1); 
 } 

 while(1) { 
 int sin_size = sizeof(struct sockaddr_in); 
 if ((client_fd = accept(sockfd, (struct sockaddr *) &remote_addr, &sin_size)) == -1) {
 perror( "accept wrong!");
 continue; 
 } 

 printf( "received a connection from %s\n", inet_ntoa(remote_addr.sin_addr));

 if (!fork()) {
 if (send(client_fd, "class 12, name sdsd, schoolnumber 24\n", 26, 0) == -1)
 perror( "send wrong!");
 close(client_fd); 
 exit(0); 
 } 

 close(client_fd);
     while(waitpid(-1, NULL, WNOHANG) > 0); 
 } 
   close(sockfd);
}