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#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdlib.h>
#define BUF_SIZE 256
static __attribute__((noinline))
void urandom_read(int fd, int count)
{
char buf[BUF_SIZE];
int i;
for (i = 0; i < count; ++i)
read(fd, buf, BUF_SIZE);
}
int main(int argc, char *argv[])
{
int fd = open("/dev/urandom", O_RDONLY);
int count = 4;
if (fd < 0)
return 1;
if (argc == 2)
count = atoi(argv[1]);
urandom_read(fd, count);
close(fd);
return 0;
}
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