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

#define PORT        3490

int main( int argc, char *argv[] )
{
  int sockfd;
  int n;

  struct sockaddr_in their_addr;

  if ( argc != 3 ) {
    fprintf( stderr, "usage: client hostip number\n" );
    exit( 1 );
  }

  if ( ( n = atoi( argv[ 2 ] ) ) == 0 )
    {
      fprintf( stderr, "ERROR: number should be > 0\n" );
      exit( 1 );
    }
  

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

  their_addr.sin_family = AF_INET;
  their_addr.sin_port = htons( PORT );
  if ( inet_pton( AF_INET, argv[ 1 ], 
		  &their_addr.sin_addr ) <= 0 ) 
    {
      perror( "inet_pton" );
      exit( 1 );
    }
  memset( &( their_addr.sin_zero ), '\0', 8 );

  if ( connect( sockfd, ( struct sockaddr * )&their_addr, 
		sizeof( struct sockaddr ) ) == -1 ) 
    {
      perror( "connect" );
      exit( 1 );
    }


  if ( send( sockfd, &n, sizeof( n ), 0 ) == -1 )
    {
      perror( "send" );
      exit( 1 );
    }
  else
    {
      printf( "Sent '%d'.\n", n );
    }

  close( sockfd );

  return 0;
}


/* author: Gustavo Sverzut Barbieri (http://www.gustavobarbieri.com.br) */