Socket 통신하기 - TCP 서버

서버 파트 - server.c

server.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/types.h>
#include <sys/socket.h>

#define  BUFF_SIZE   1024

int   main( void)
{
   int   server_socket;
   int   client_socket;
   int   client_addr_size;

   struct sockaddr_in   server_addr;
   struct sockaddr_in   client_addr;

   char   buff_rcv[BUFF_SIZE+5];
   char   buff_snd[BUFF_SIZE+5];

   server_socket  = socket( PF_INET, SOCK_STREAM, 0);
   if( -1 == server_socket)
   {
      printf( "server socket ?앹꽦 ?ㅽ뙣n");
      exit( 1);
   } else {
  printf("Socket created : %d\n",socket);
   }
  
   memset( &server_addr, 0, sizeof( server_addr));
  
   server_addr.sin_family     = AF_INET;
   server_addr.sin_port       = htons(9100);
   server_addr.sin_addr.s_addr= htonl(INADDR_ANY);

   if( -1 == bind( server_socket, (struct sockaddr*)&server_addr, sizeof( server_addr) ) )
   {
      exit( 1);
   } else {
 printf("socket binded\n/");
   }

   while( 1)
   {
      if( -1 == listen(server_socket, 5))
      {
         exit( 1);
      } else {
  printf("listening.....\n");
 }
     

      client_addr_size  = sizeof( client_addr);
      client_socket     = accept( server_socket, (struct sockaddr*)&client_addr, &client_addr_size);

      if ( -1 == client_socket)
      {
         exit( 1);
      } else {
  printf("client socket created...\n");
 }

      read ( client_socket, buff_rcv, BUFF_SIZE);
      printf( "receive: %s\n", buff_rcv);
     
      sprintf( buff_snd, "%d : %s", strlen( buff_rcv), buff_rcv);
      write( client_socket, buff_snd, strlen( buff_snd)+1);      close( client_socket);
   }
}