On Thu, Jul 17, 2014 at 05:38:20PM -0400, Theodore Ts'o wrote:
> The getrandom(2) system call was requested by the LibreSSL Portable
> developers. It is analoguous to the getentropy(2) system call in
> OpenBSD.
> +SYSCALL_DEFINE3(getrandom, char __user *, buf, size_t, count,
> + unsigned int, flags)
> +{
> + int r;
> +
> + if (flags & ~(GRND_NONBLOCK|GRND_RANDOM))
> + return -EINVAL;
> +
> + if (count > INT_MAX)
> + count = INT_MAX;
> +
> + if (flags & GRND_RANDOM)
> + return _random_read(flags & GRND_NONBLOCK, buf, count);
> + if (flags & GRND_NONBLOCK) {
> + if (!completion_done(&urandom_initialized))
> + return -EAGAIN;
> + } else {
> + r = wait_for_completion_interruptible(&urandom_initialized);
> + if (r)
> + return r;
> + }
> + return urandom_read(NULL, buf, count, NULL);
> +}
I like how tiny this ends up being. Feel free to add my rb:.
Reviewed-by: Zach Brown <zab@xxxxxxxxx>
- z
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