소켓통신 클라이언트소스

/*
 ============================================================================
 Name        : SocketClient.c
 Author      : SeYUN
 Version     :
 Copyright   : Your copyright notice
 Description : Hello World in C, Ansi-style
 ============================================================================
 */
#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( int argc, char **argv)
{
   int   client_socket;
   struct sockaddr_in   server_addr;
   char   buff[BUFF_SIZE+5];
   client_socket  = socket( PF_INET, SOCK_STREAM, 0);
   if( -1 == client_socket)
   {
      printf( "socket 생성 실패\n");
      exit( 1);
   }
   memset( &server_addr, 0, sizeof( server_addr));
   server_addr.sin_family     = AF_INET;
   server_addr.sin_port       = htons( 4000);
   server_addr.sin_addr.s_addr= inet_addr( "127.0.0.1");
   if( -1 == connect( client_socket, (struct sockaddr*)&server_addr, sizeof( server_addr) ) )
   {
      printf( "접속 실패\n");
      exit( 1);
   }
   write( client_socket, argv[1], strlen( argv[1])+1);      // +1: NULL까지 포함해서 전송
   read ( client_socket, buff, BUFF_SIZE);
   printf( "%s\n", buff);
   close( client_socket);
   return 0;
}