LinuxQuestions.org - generating random numbers for 10 minutes

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generating random numbers for 10 minutes

i have to generate traffic over a wireless network by sending random numbers over the network for about,say 10 minutes.What i dont understand is how to time the generation of random numbers to a particular value.
I am doing the programming in C and trying to use the rand() function.

Cheers,
Shubham

I don't quite understand what you mean by "how to time the generation of random numbers to a particular value". Do you mean, how to loop over the random-number-sending bit for 10 minutes? Something like this would work...

Code:

#include <sys/types.h>

#include <time.h>



int main()

{

int num_seconds = 600;

time_t starttime;

time_t endtime;



time(&starttime);

time(&endtime);

while(endtime <= starttime + num_seconds)

{

//do your numbersending here

time(&endtime);

}

return 0;

}

Moved: This thread is more suitable in Programming and has been moved accordingly to help your question get the exposure it deserves.

hey...
thnx for the code...
there's another problem that i'm facing with the sending of random numbers to generate traffic,which is,where do i edit the program for the client.
I'm using the following program for the client :

#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <string.h>
#include <netdb.h>
#include <stdlib.h>
#include <errno.h>
#include <readline/readline.h>
#include <readline/history.h>
int main(int argc, char **argv)
{
int sockfd;
struct sockaddr_in servaddr;
if (argc != 2){
printf("usage: tcpcli <IPaddress>");
exit(0);
}
sockfd = socket(AF_INET, SOCK_STREAM, 0);
bzero(&servaddr, sizeof(servaddr));
servaddr.sin_family = AF_INET;
servaddr.sin_port = htons(1200);
inet_pton(AF_INET, argv[1], &servaddr.sin_addr);
connect(sockfd, (struct sockaddr *) &servaddr, sizeof(servaddr));
str_cli(stdin, sockfd); /* do it all */
exit(0);
}
str_cli(FILE *fp, int sockfd)
{
char sendline[1000], recvline[1000];
while (fgets(sendline, 1000, fp) != NULL) {
write(sockfd, sendline, strlen (sendline));
if (read(sockfd, recvline,1000) == 0){
printf("str_cli: server terminated prematurely");
exit(0);
}
fputs(recvline, stdout);
return(0);
}
}

this program uses "fgets", which asks for input from the user.but i want to use rand() to generate random numbers and send them over to the server. how do i do that?

Something like

Code:

while (your_condition)

{

    sprintf(sendline,"%d",your_randomnumber);

    ....

    ....

}