Change WASI's RawFd from u32 to c_int (i32).
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WASI previously used `u32` as its `RawFd` type, since its "file descriptors" are unsigned table indices, and there's no fundamental reason why WASI can't have more than 2^31 handles. However, this creates myriad little incompability problems with code that also supports Unix platforms, where `RawFd` is `c_int`. While WASI isn't a Unix, it often shares code with Unix, and this difference made such shared code inconvenient. rust-lang#87329 is the most recent example of such code. So, switch WASI to use `c_int`, which is `i32`. This will mean that code intending to support WASI should ideally avoid assuming that negative file descriptors are invalid, even though POSIX itself says that file descriptors are never negative. This is a breaking change, but `RawFd` is considerd an experimental feature in [the documentation]. [the documentation]: https://doc.rust-lang.org/stable/std/os/wasi/io/type.RawFd.html
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@bors: r+ Seems reasonable to me! And yeah the intention is that |
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…laumeGomez Rollup of 10 pull requests Successful merges: - rust-lang#87818 (Fix anchors display in rustdoc) - rust-lang#87983 (Use more accurate spans when proposing adding lifetime to item) - rust-lang#88012 (Change WASI's `RawFd` from `u32` to `c_int` (`i32`).) - rust-lang#88031 (Make `BuildHasher` object safe) - rust-lang#88036 (Fix dead code warning when inline const is used in pattern) - rust-lang#88082 (Take into account jobs number for rustdoc GUI tests) - rust-lang#88109 (Fix environment variable getter docs) - rust-lang#88111 (Add background-color on clickable definitions in source code) - rust-lang#88129 (Fix dataflow graphviz bug, make dataflow graphviz modules public) - rust-lang#88136 (Move private_unused.rs test to impl-trait) Failed merges: r? `@ghost` `@rustbot` modify labels: rollup
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WASI previously used
u32as itsRawFdtype, since its "file descriptors"are unsigned table indices, and there's no fundamental reason why WASI can't
have more than 2^31 handles.
However, this creates myriad little incompability problems with code
that also supports Unix platforms, where
RawFdisc_int. While WASIisn't a Unix, it often shares code with Unix, and this difference made
such shared code inconvenient. #87329 is the most recent example of such
code.
So, switch WASI to use
c_int, which isi32. This will mean that codeintending to support WASI should ideally avoid assuming that negative file
descriptors are invalid, even though POSIX itself says that file descriptors
are never negative.
This is a breaking change, but
RawFdis considerd an experimentalfeature in the documentation.
r? @alexcrichton