helloworld.c

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/*
 *  Copyright 2006 by Texas Instruments Incorporated.
 *  All rights reserved. Property of Texas Instruments Incorporated.
 *  Restricted rights to use, duplicate or disclose this code are
 *  granted through contract.
 *
 *  @(#) TCP/IP_Network_Developers_Kit 1.91.00.08 08-22-2006 (ndk-a08)
 */
//---------------------------------------------------------------------------
// UDP Client Program
//---------------------------------------------------------------------------
// HELLOWORLD.C
//
// Test the crude echo by sending to port 7 and waiting
// for a reply.
//
// Author: Michael Denio
//         Magdalena Iovescu
//---------------------------------------------------------------------------
#include <windows.h>
#include <stdio.h>
#include <time.h>
#include <winsock.h>

#define TESTSIZE                15

int main( int argc, char *argv[] )
{
    WORD                wVersionRequested;
    WSADATA             wsaData;
    SOCKET              s;
    struct sockaddr_in  sin;
    unsigned char       *pBuf = "Hello World!\n";
    int                 tmp1,tmp2,tmp3,tmp4;
    int                 idle;
    fd_set              readfds;
    struct timeval      timeout;
    time_t              ts,tn;


    wVersionRequested = MAKEWORD(1, 1);
    tmp1 = WSAStartup(wVersionRequested, &wsaData);
    if (tmp1 != 0)
    {
        printf("\r\nUnable to initialize WinSock for host info");
        exit(0);
    }

    if( (argc != 2) ||
        sscanf(argv[1],"%03d.%03d.%03d.%03d",&tmp1,&tmp2,&tmp3,&tmp4)!=4 ||
        (tmp1 < 0 || tmp1 > 255 || tmp2 < 0 || tmp2 > 255 ||
         tmp3 < 0 || tmp3 > 255 || tmp4 < 0 || tmp4 > 255) )
    {
        printf("\nUsage: HELLOWORLD <x.x.x.x>\n");
        goto leave;
    }

    tmp1 |= tmp2 << 8;
    tmp1 |= tmp3 << 16;
    tmp1 |= tmp4 << 24;

    printf("\nTesting DSP UDP echo server at %d.%d.%d.%d\n",
                tmp1&255, (tmp1>>8)&255, (tmp1>>16)&255, (tmp1>>24)&255 );

    s = socket( AF_INET, SOCK_DGRAM, 0 );
    if( s < 0 )
    {
        printf("failed socket (%d)\n",WSAGetLastError());
        goto leave;
    }

    sin.sin_family      = AF_INET;
    sin.sin_addr.s_addr = 0;
    sin.sin_port        = htons(1234);

    if ( bind( s, &sin, sizeof(sin) ) < 0 )
    {
        printf("failed bind (%d)\n",WSAGetLastError());
        goto leave;
    }

    idle     = 0;

    timeout.tv_sec = 0;
    timeout.tv_usec = 0;

    sin.sin_addr.s_addr = tmp1;
    sin.sin_port        = htons(7);

    ts = time(0);

        // Send the string to the DSP
        if( sendto( s, pBuf, strlen(pBuf), 0, &sin, sizeof(sin) ) < 0 )
        {
                printf("send failed (%d)\n",WSAGetLastError());
                goto leave;
        }

        // Now try and receive a packet
        idle = 0;
        do
        {
                FD_ZERO( &readfds );
                FD_SET( s, &readfds );

                if( !select( 0, &readfds, 0, 0, &timeout ) )
                {
                        if( ++idle == 50000 )
                        {
                                printf("Receive timeout\n");
                                goto leave;
                        }
                }
                else
                        break;
        } while(1);

        tmp1 = recv( s, pBuf, TESTSIZE, 0 );

        // Print the data echoed back
        if (tmp1 > 0)
                printf("\nReceived back %d bytes.\nData Echoed back: %s\n",tmp1, pBuf);

    tn = time(0) - ts;
    printf("Exiting test. Time = %d seconds",tn);

leave:
    if( pBuf )
        free( pBuf );
    if( s >= 0 )
        closesocket( s );

    WSACleanup();
}