#include <stdio.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <pthread.h>
#include <string.h>
#include <errno.h>
#include <stdlib.h>
#include <unistd.h>
#include <netinet/in.h>
#include <sys/time.h>
#include <sys/ioctl.h>
#include <sys/wait.h>

//person number who is chating   
#define CHATNUM 8
int sd[CHATNUM];

// server send message that one client send to every client that online  
void sendMsgToClient(int clientSocket)
{
  char name[30];
  char buffer[2048];
  char temp[3000];

  int i=0;
  int returnValue=-1;
  //get client's name
  if((returnValue=recv(clientSocket,name,20,0))==-1)
  {
      perror("recv");
      exit(1);
  }
  name[returnValue]=':';
  name[returnValue]='\0';
  printf("%s\n",name);
  while(1)
  {
     //get the imformation that client send
     returnValue=recv(clientSocket,buffer,1024,0);
     if(returnValue==-1)
     {
       perror("recv");
       exit(1);
     }
     //the client was offline

     else if( returnValue==0)
     {
         printf("%sbye",name);
         break;
     }
     /*
      * find a socket that attact to client onlin
      * send message to client online
      */
     for(i=0;i<CHATNUM;i++)
     {
         if(sd[i]!=-1)
         {
           temp[0]='\0';
           strcat(temp,name);
           strcat(temp,buffer);
           printf("%s\n",temp);
           if(send(sd[i],temp,strlen(temp),0)==-1)
           {
              perror("send");
              exit(1);
           }
         }
      }
  }
  close(clientSocket);
  for(i=0;i<CHATNUM;i++)
  {
      if(sd[i]==clientSocket)
      {
         sd[i]=-1;
      }
  }
  pthread_exit(NULL);
}

int main()
{
  int i=0;
  int localSocket=0;

  int clientSocket=0;
  pthread_t pd;
  struct sockaddr_in server_ip;
  struct sockaddr_in client_ip;
  socklen_t client_addr_size=0;
  //init socket
  memset(sd,-1,sizeof(sd));
  if((localSocket=socket(AF_INET,SOCK_STREAM,0))==-1)
  {
      perror("socket");
      exit(1);
  }
  //set IP imformation
  server_ip.sin_family=AF_INET;
  server_ip.sin_port=htons(12345);
  server_ip.sin_addr.s_addr=INADDR_ANY;
  //bzero(&(server_ip.sin_zero),8);
  if(bind(localSocket,(struct sockaddr *) &server_ip,\
  sizeof(struct sockaddr ))==-1)
  {
     perror("bind");
     exit(1);
  }
  if(listen(localSocket,10)==-1)
  {
     perror("listen");
     exit(1);
  }
  while(1)
  {
       client_addr_size=sizeof(struct sockaddr_in);
       if((clientSocket=accept(localSocket,(struct sockaddr *) &client_ip,\
       &client_addr_size))==-1)
       {
           perror("accept");
           exit(1);
       }
       //find a free socket
       while(sd[i]==-1)
       {
          i=(i+1)%CHATNUM;
          continue;
       }
       sd[i]=clientSocket;
       pthread_create(&pd,NULL,(void *) sendMsgToClient,(int *)clientSocket);
  }
  return 0;
}

#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <sys/time.h>
#include <sys/ioctl.h>
#include <sys/un.h>
#include <netinet/in.h>
#include <pthread.h>

void dellMsgFromServer(int sd)
{
  char recvMsg[2000];
  int recvMsgLen=0;
  w