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[libcxx] random_device, use arc4random() on FreeBSD, NetBSD and DragonFlyBSD 

Reviewed By: ldionne, emaste, dim

Differential Revision: https://reviews.llvm.org/D122628
This commit is contained in:
Brad Smith 2022-04-24 21:45:49 -04:00
parent c261f78d05
commit d13f502389
2 changed files with 7 additions and 1 deletions
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5
libcxx/docs/ReleaseNotes.rst
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@ -97,6 +97,11 @@ ABI Changes
``_LIBCPP_ABI_USE_CXX03_NULLPTR_EMULATION`` will not be honoured anymore and there ``_LIBCPP_ABI_USE_CXX03_NULLPTR_EMULATION`` will not be honoured anymore and there
will be no way to opt back into the C++03 emulation of ``std::nullptr_t``. will be no way to opt back into the C++03 emulation of ``std::nullptr_t``.
- On FreeBSD, NetBSD and DragonFlyBSD, ``std::random_device`` is now implemented on top of
``arc4random()`` instead of reading from ``/dev/urandom``. Any implementation-defined
token used when constructing a ``std::random_device`` will now be ignored instead of
interpreted as a file to read entropy from.
Build System Changes Build System Changes
-------------------- --------------------

3
libcxx/include/__config
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@ -350,7 +350,8 @@
// Use rand_s(), for use on Windows. // Use rand_s(), for use on Windows.
// When this option is used, the token passed to `std::random_device`'s // When this option is used, the token passed to `std::random_device`'s
// constructor *must* be "/dev/urandom" -- anything else is an error. // constructor *must* be "/dev/urandom" -- anything else is an error.
#if defined(__OpenBSD__) || defined(__APPLE__) #if defined(__APPLE__) || defined(__FreeBSD__) || defined(__NetBSD__) || \
defined(__OpenBSD__) || defined(__DragonFly__)
# define _LIBCPP_USING_ARC4_RANDOM # define _LIBCPP_USING_ARC4_RANDOM
#elif defined(__wasi__) #elif defined(__wasi__)
# define _LIBCPP_USING_GETENTROPY # define _LIBCPP_USING_GETENTROPY