linux socket聊天程序 （进程(fork)版本）

 

 

/**************************** client.c ********************************** */

 

#include<stdio.h>
#include<unistd.h>
#include<strings.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<netdb.h>

#define PORT 1234   /*listen port*/
#define MAXDATASIZE 100

int main ( int argc, char *argv[])
{
 int sockfd, num;
 pid_t pid;
 char buf[MAXDATASIZE];
 struct hostent *he;
 struct sockaddr_in server;

 if(argc!=2)
 {
  printf("usage %s<ip address>/n",argv[0]);
  exit(1); 
 }
 /*get ip address*/
 if((he = gethostbyname(argv[1])) == NULL)
 {
  printf("gethostbyname error/n");
  exit(1);
 }
 if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
 {
  printf("socket() error /n");
  exit(1);
 }

 bzero(&server, sizeof(server));
 server.sin_family = AF_INET;
 server.sin_port = htons(PORT);
 server.sin_addr = *((struct in_addr *)he->h_addr);

 if(connect(sockfd, (struct sockaddr *)&server, sizeof(server)) == -1)
 {
  printf("connetc() error/n");
  exit(1);
 }
 if((pid = fork()) >0)
 {
  while(1)
  {
  fgets(buf, MAXDATASIZE, stdin);  
  send(sockfd, buf, MAXDATASIZE, 0);
  
  }
 }
 else if(pid == 0)
 { while(1)
  {
  recv(sockfd, buf, MAXDATASIZE, 0);
  printf("server message: %s",buf);
  }
  
 }
 else
    return 1;
 
 close(sockfd);  
}

 

 

 

 

 

 

 

/*******************************************************/

/*                                      server.c                                                       */

/******************************************************/

 

 #include<stdio.h>
 #include<strings.h>
 #include<unistd.h>
 #include<sys/types.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<arpa/inet.h>

#define PORT 1234
#define BACKLOG 1
#define MAXDATASIZE 100

void main()
{
 int listenfd, connectfd;
 struct sockaddr_in server;
 struct sockaddr_in client;
 socklen_t addrlen;
 char buf[MAXDATASIZE];
 pid_t pid;
 
 if((listenfd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
 {
  perror("socket() error.");
  exit(1); 
 }
 
 int opt = SO_REUSEADDR;
 setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
 
 bzero(&server, sizeof(server));
 server.sin_family = AF_INET;
 server.sin_port = htons(PORT);
 server.sin_addr.s_addr = htonl(INADDR_ANY);
 if(bind(listenfd, (struct sockaddr *)&server, sizeof(server)) == -1)
 {
  perror("bind() error.");
  exit(1); 
 } 
 if(listen(listenfd, BACKLOG) == -1)
 {  
  perror("listen() error.");
  exit(1); 
 }
 
 addrlen = sizeof(client);
 while(1)
 {
  if((connectfd = accept(listenfd, (struct sockaddr *)&client, &addrlen )) == -1)
  {
  perror("accept() error.");
  exit(1); 
  }
  if((pid = fork()) >0)
  {
   while(1)
   {
   close(listenfd);
   recv(connectfd, buf, MAXDATASIZE,0);
   printf("the client says: %s/n",buf);
   }
   
  }
  else if(pid == 0)
  {
   while(1)
   {
   close(listenfd);
   fgets(buf, MAXDATASIZE, stdin);
   send(connectfd, buf, MAXDATASIZE, 0);
   }
  }
  else
   return 1;
 }
 close(connectfd);
 close(listenfd);
}