Don't fall back to file I/O on Linux when Rust only supports kernels guaranteed to have it about getrandom HOT 5 CLOSED

I like this idea, it also serves as a bit of a test run for removing such file-based support once rust increases its supported kernel version.

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Sounds good to me!

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What about Android targets?

In this issue @josephlr wrote

We need to have a /dev/urandom fallback and will need it at least until the 3.16 kernel ends LTS support in mid 2020.

So we probably can disable file fallback for Android targets as per our platform support policy?

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So we probably can disable file fallback for Android targets as per our platform support policy?

I have been assuming getrandom's platform support is that of its MSRV, not the latest stable Rust version. We we need to go back and look at what the kernel support policy of Rust 1.36 was.

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That documentation was introduced in 1.47.0: https://doc.rust-lang.org/1.47.0/rustc/platform-support.html

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