/*#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h> */
#include <string.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

/*SYNTAX   ./clientUDPs (host)  */

char PORT[] = "47200";

int main(int argc, char * argv[])  {
    int n, s;
    char buf[1024];
    char hostname[64];
    struct addrinfo hints, *result, *tmp;

    memset(&hints, 0, sizeof(hints)); /*It is important reset all to NULL*/

    switch(argc) {
        case 1:
            /* Get our local host name.  */
          gethostname(hostname, sizeof(hostname));
          break;
        case 2:
            /* Get name from command line */
          strcpy(hostname, argv[1]);
          break;
        default:
          printf("Usage: %s [server_name]\n",argv[0]);
          exit(-1);
    }
        
    hints.ai_family = AF_INET; //IPv4
    hints.ai_socktype = SOCK_DGRAM; //UDP

    if ((getaddrinfo(hostname, PORT, &hints, &result)) != 0) { /*Checking status of getaddrinfo result*/
        fprintf(stderr, "getaddrinfo error\n");
        exit(EXIT_FAILURE);
    }

    /* getaddrinfo() returns a list of address structures.
    Try each address until we successfully connect.
    If socket (or connect) fails, we (close the socket
    and) try the next address. */

    for ( tmp = result; tmp != NULL; tmp = tmp->ai_next) {
      s =  socket(tmp->ai_family, tmp->ai_socktype, tmp->ai_protocol);

      if (s == -1) continue;      
      if (connect(s, tmp->ai_addr, tmp->ai_addrlen) != -1)
            break;                  /* Success */    
      close(s);  
    }

    freeaddrinfo(result);           /* No longer needed */

    if (tmp == NULL) { /*No address succeeded*/
           fprintf(stderr, "Could not connect\n");
           exit(EXIT_FAILURE);
    }

    /* Read from standard input, and copy the
     * data to the socket.  */
    while ((n = read(0, buf, sizeof(buf))) > 0) 
      sendto(s, buf, n, 0, tmp -> ai_addr, tmp -> ai_addrlen);
      /* We could also use just send or write */
      /*send(s, buf, n, 0);    */
    
    /* send an empty message to close the server*/
    sendto(s, buf, 0, 0, tmp -> ai_addr, tmp -> ai_addrlen);
    close(s);
    exit(0);
}