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 int main(void)
10 {
11 	int fd = open("/dev/urandom", O_RDONLY);
12 	int i;
13 	char buf[BUF_SIZE];
14 
15 	if (fd < 0)
16 		return 1;
17 	for (i = 0; i < 4; ++i)
18 		read(fd, buf, BUF_SIZE);
19 
20 	close(fd);
21 	return 0;
22 }
23