Calling getrandom() with a zero length is actually valid and useful:
- Calling getrandom(..., 0, 0) will block until the RNG is initialized.
- Calling getrandom(..., 0, GRND_NONBLOCK) will query whether the RNG
is initialized.
So instead of short circuiting execution for these circumstances, pass
this through to the syscall.
Change-Id: I15178f087908a2d8be6c020a1ef800cc0a074742
Reviewed-on: https://go-review.googlesource.com/c/go/+/615315
Run-TryBot: Jason Donenfeld <Jason@zx2c4.com> Reviewed-by: Filippo Valsorda <filippo@golang.org>
Auto-Submit: Jason Donenfeld <Jason@zx2c4.com> Reviewed-by: Michael Pratt <mpratt@google.com> Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Michael Knyszek <mknyszek@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>