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Guillaume Gomez
962fa98eeb
Trusty: Implement `write_vectored` for stdio Currently, `write` for stdout and stderr on Trusty is implemented with the semantics of `write_all`. Instead, call the underlying syscall only once in `write` and use the default implementation of `write_all` like other platforms. Also, implement `write_vectored` by adding support for `IoSlice`. Refactor stdin to reuse the unsupported type like https://github.com/rust-lang/rust/pull/136769. It requires #138875 to fix the build for Trusty, though they do not conflict and can merge in either order. cc `@randomPoison`