1#include <stdio.h>
 2#include <unistd.h>
 3#include <sys/types.h>
 4#include <sys/stat.h>
 5#include <fcntl.h>
 6#include <stdlib.h>
 7
 8#define BUF_SIZE 256
 9
10static __attribute__((noinline))
11void urandom_read(int fd, int count)
12{
13       char buf[BUF_SIZE];
14       int i;
15
16       for (i = 0; i < count; ++i)
17               read(fd, buf, BUF_SIZE);
18}
19
20int main(int argc, char *argv[])
21{
22	int fd = open("/dev/urandom", O_RDONLY);
23	int count = 4;
24
25	if (fd < 0)
26		return 1;
27
28	if (argc == 2)
29		count = atoi(argv[1]);
30
31	urandom_read(fd, count);
32
33	close(fd);
34	return 0;
35}