More beta backports #38884
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More beta backports #38884
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This commit fixes a mistake introduced in rust-lang#31618 where overlapped handles were leaked to child processes on Windows. On Windows once a handle is in overlapped mode it should always have I/O executed with an instance of `OVERLAPPED`. Most child processes, however, are not prepared to have their stdio handles in overlapped mode as they don't use `OVERLAPPED` on reads/writes to the handle. Now we haven't had any odd behavior in Rust up to this point, and the original bug was introduced almost a year ago. I believe this is because it turns out that if you *don't* pass an `OVERLAPPED` then the system will [supply one for you][link]. In this case everything will go awry if you concurrently operate on the handle. In Rust, however, the stdio handles are always locked, and there's no way to not use them unlocked in libstd. Due to that change we've always had synchronized access to these handles, which means that Rust programs typically "just work". Conversely, though, this commit fixes the test case included, which exhibits behavior that other programs Rust spawns may attempt to execute. Namely, the stdio handles may be concurrently used and having them in overlapped mode wreaks havoc. [link]: https://blogs.msdn.microsoft.com/oldnewthing/20121012-00/?p=6343 Closes rust-lang#38811
Since 8285ab5, which was merged in with rust-lang#38061, the help for the --print option is missing the surrounding [ ] around the possible options. Signed-off-by: Doug Goldstein <cardoe@cardoe.com>
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r? @sfackler (rust_highfive has picked a reviewer for you, use r? to override) |
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Looks good to me! I'll merge once the PRs have all landed |
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Almost ready, 4/6 of these have landed with no changes necessary, one's being tested, and the last is next in the queue |
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Everything merged with no changes, yay! Merging |
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This corresponds to the following PRs (I hope):