56daa8a199
* convert wasi-common from defining its own error to using wiggle trappable error * wasi-common impl crates: switch error strategy * wasmtime-wasi: error is trappable, and no longer requires UserErrorConversion * docs * typo * readdir: windows fixes * fix windows scheduler errors fun fact! the Send and Recv errors here that just had a `.context` on them were previously not being captured in the downcasting either. They need to be traps, and would have ended up that way by ommission, but you'd never actually know that by reading the code!
27 lines
1.1 KiB
Rust
27 lines
1.1 KiB
Rust
//! wasi-common uses an [`Error`] type which represents either a preview 1 [`Errno`] enum, on
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//! [`anyhow::Error`] for trapping execution.
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//!
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//! The user can construct an [`Error`] out of an [`Errno`] using the `From`/`Into` traits.
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//! They may also use [`Error::trap`] to construct an error that traps execution. The contents
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//! can be inspected with [`Error::downcast`] and [`Error::downcast_ref`]. Additional context
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//! can be provided with the [`Error::context`] method. This context is only observable with the
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//! `Display` and `Debug` impls of the error.
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pub use crate::snapshots::preview_1::error::{Errno, Error, ErrorExt};
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use std::fmt;
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/// An error returned from the `proc_exit` host syscall.
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///
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/// Embedders can test if an error returned from wasm is this error, in which
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/// case it may signal a non-fatal trap.
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#[derive(Debug)]
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pub struct I32Exit(pub i32);
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impl fmt::Display for I32Exit {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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write!(f, "Exited with i32 exit status {}", self.0)
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}
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}
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impl std::error::Error for I32Exit {}
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