root/tools/regression/ccd/layout/a.c
#include <unistd.h>

static uint32_t buf[512/4];
main()
{
        u_int u = 0;

        while (1) {
                buf[0] = u++;

                if (512 != write(1, buf, sizeof buf))
                        break;
        }
        exit (0);
}