LinuxQuestions.org - Invalid return value for "sendto" socket function

Hello,

I am using Ubuntu 10.04 on virtual box. (Host OS : Windows XP)
I am trying to send UDP packets to another machine using socket programming.
Here is a piece of code.

Code:

#include <stdio.h>

#include <sys/types.h>

#include <sys/socket.h>

#include <netinet/in.h>

#include <errno.h>

#include <string.h>





//#define SRC_IP_ADDR        0x87246EFB

#define SRC_IP_ADDR        0x0A00020F

#define DST_IP_ADDR        0x8724B48C





struct in_addr  macLocalIP ; /* MAC local IP address */

unsigned short int  macLocalPort          = 3001;      /* MAC local UDP port */

unsigned short int  macRemotePort          = 3000;      /* MAC local UDP port */

struct sockaddr_in x_sockaddr_in;

struct sockaddr_in x_sockaddr_out;

ssize_t ret_x_r;







TxSocket()

{

        char temp_buf[1024];

        

        macXsocket = socket(AF_INET, SOCK_DGRAM, 0);

        if(macXsocket < 0 )

        {

                printf("\n Socket creation is failed \n");

                return -1;

        }

        printf("\n Socket creation is successful: %x",macXsocket);

        

      macLocalIP.s_addr =  SRC_IP_ADDR;

      x_sockaddr_in.sin_family= AF_INET;

      x_sockaddr_in.sin_addr.s_addr = htonl(SRC_IP_ADDR);

        x_sockaddr_in.sin_port = htonl(macLocalPort);

        macXbind = bind( macXsocket,

                        (const struct sockaddr *) &x_sockaddr_in,

                        sizeof(x_sockaddr_in)

                      );



        if(macXbind < 0 )

        {

                printf("\n Binding is failed \n");

                printf("Error =%s, %x\n", strerror(errno), errno);

                return -1;

        }

        printf("\n Binding is successful: %x",macXbind);



        x_sockaddr_out.sin_family= AF_INET;

        x_sockaddr_out.sin_addr.s_addr = htonl(DST_IP_ADDR);

        x_sockaddr_out.sin_port = htonl(macRemotePort);

        bzero(&(x_sockaddr_out.sin_zero),8);

        printf("\n size of socket = %x",sizeof(x_sockaddr_out));



        while(1){

        ret_x_r = sendto(macXsocket,

                        (const void *) &temp_buf[0],

                        1024,

                        0,

                        (const struct sockaddr *) &x_sockaddr_out,

                        sizeof(x_sockaddr_out));

                

        if(ret_x_r < 0)

        {

                printf("Error =%s, %x\n", strerror(errno), errno);

        }



        sleep(10);

        }

Here, sendto function always returns "-1" and printed error message is "Error =Invalid argument, 16"

I cross verified the parameter values, it seems to be fine. Could anybody point me if I am doing anything wrong here???

Thanks in advance.