On Fri, 2007-06-01 at 11:27 -0500, Greg Donald wrote: > On 5/31/07, Avishay Traeger <atraeger@xxxxxxxxxxxxx> wrote: > > You can only use "exported" functions from modules. Functions are > > exported from the kernel using "EXPORT_SYMBOL(function_name);" > > For random numbers, maybe take a look at srandom32() to set the random > > seed and random32() to get a random 32-bit number. > > Thanks, that works fine. > > Do I _need_ to call srandom32() before using random32()? Calling > rmmod and insmod a few times, it appears to be seeded already. > > Assuming I need to call it, what can I use to seed it? I don't have > time() from time.h anymore so this doesn't work: > > srandom32( ( unsigned ) time( NULL ) / 2 ); I don't know if you NEED to call srandom32(), but it surely can't hurt. Instead of time(), by which I assume you mean the system call that you might use from user-space, you can try using: - the lower 32 bits of "jiffies" (include/linux/jiffies.h) - do_gettimeofday() and use the microsecond counter (make sure to only use 32 bits). Avishay -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
