sendto timeout time

QNX USERS QNX6 - Applications
1
  1. Can the sendto timeout be set the time for me?
  2. normal the sendto timeout time is 4~5 sec,but I want set the timeout for 10 msec
    3.Where the program error?

follow is my program:

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <pthread.h>
#include <sched.h>
#include <sys/neutrino.h>
#include <sys/time.h>
#include <sys/timeb.h>

#define MYSENPORT 6001 // the port users will be connecting to
#define RECVPORT 6001
#define MAXBUFLEN 1000

int sockfd;
struct sockaddr_in their_addr; // connector's address information
struct hostent *he;
int numbytes;
int argc;
char *argv[2];
int sockrecv;
struct sockaddr_in my_addr;    // my address information
struct sockaddr_in talker_addr; // connector's address information
int addr_len;
char buf[MAXBUFLEN];
char word1[13] = "192.168.0.3";
char word2[10]= "abcdefghij";
char word3[10];

struct timeval tv;
socklen_t cmsg_len;
struct timeb timebuf;
char *now;
int r_inf, len, f_len ;
struct sockaddr_in from ;

struct sockaddr_in recv_test; // connector’s address information

#define settimeout_debug 1

int main()
{

/////////////set scheduleing type//////////////////////////////
int err;
int policy;
int i=0;
struct sched_param param;

policy=SchedGet(0, 0, &param);
            err =  SchedSet( 0, 0, SCHED_FIFO, &param );
           if (err == -1){
	printf("Set error");
	return 0;
           }
           word1[13] = '\0';

printf("Send to address %s\n", word1);

     if ((he=gethostbyname(word1)) == NULL) {  // get the host info
         perror("gethostbyname");
         exit(1);
     }

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

 their_addr.sin_family = AF_INET;     // host byte order
 their_addr.sin_port = htons(MYSENPORT); // short, network byte order
 their_addr.sin_addr = *((struct in_addr *)he->h_addr);

#if settimeout_debug
tv.tv_sec = 2;
tv.tv_usec = 10000;
cmsg_len =sizeof(struct timeval);
setsockopt( sockfd, SOL_SOCKET, SO_SNDTIMEO , &tv, cmsg_len );
#endif

  /*Read system time*/  
  ftime( &timebuf );
  now = ctime( &timebuf.time );
  printf( "\n1.The time is %.19s.%hu\n",now, timebuf.millitm );
  		

while(1)
{

  
   if ((numbytes=sendto(sockfd, word2, 78, 0,
       (struct sockaddr *)&their_addr, sizeof(struct sockaddr))) == -1)

   {
        perror("\nsocket sendto");
         fprintf( stderr,"sendto: %s\n",  strerror( errno ) );
   
        /*Read system time*/   
            ftime( &timebuf );
  	 now = ctime( &timebuf.time );
  	printf( "2.The time is %.19s.%hu\n",now, timebuf.millitm );
    
     i++;
     if(i>5)  goto end;
   
   }
}

end:
close(sockfd);

 return(0);

}

The program’s result following

Send to address 192.168.0.3

1.The time is Fri Jul 18 18:05:42.805

socket sendto: Host is down
sendto: Host is down
2.The time is Fri Jul 18 18:05:52.228

socket sendto: Host is down
sendto: Host is down
2.The time is Fri Jul 18 18:05:52.228

socket sendto: Host is down
sendto: Host is down
2.The time is Fri Jul 18 18:05:52.229

socket sendto: Host is down
sendto: Host is down
2.The time is Fri Jul 18 18:05:52.229

socket sendto: Host is down
sendto: Host is down
2.The time is Fri Jul 18 18:05:52.230

socket sendto: Host is down
sendto: Host is down
2.The time is Fri Jul 18 18:05:52.231