[PATCH] D36399: [sanitizers] Add a blocking boolean to GetRandom prototype

[Kostya Kortchinsky via Phabricator via llvm-commits]

cryptoad created this revision.
Herald added a subscriber: kubamracek.

On platforms with `getrandom`, the system call defaults to blocking. This
becomes an issue in the very early stage of the boot for Scudo, when the RNG
source is not set-up yet: the syscall will block and we'll stall.

Introduce a parameter to specify that the function should not block, defaulting
to blocking as the underlying syscall does.

Update Scudo to use the non-blocking version.


https://reviews.llvm.org/D36399

Files:
  lib/sanitizer_common/sanitizer_common.h
  lib/sanitizer_common/sanitizer_linux.cc
  lib/sanitizer_common/sanitizer_mac.cc
  lib/sanitizer_common/sanitizer_win.cc
  lib/sanitizer_common/tests/sanitizer_common_test.cc
  lib/scudo/scudo_utils.h

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