wasmtime-wasi 36.0.9

WASI implementation in Rust
Documentation 
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bitflags::bitflags! {
    #[derive(Copy, Clone, Debug, PartialEq, Eq)]
    pub struct FilePerms: usize {
        const READ = 0b1;
        const WRITE = 0b10;
    }
}

bitflags::bitflags! {
    #[derive(Copy, Clone, Debug, PartialEq, Eq)]
    pub struct OpenMode: usize {
        const READ = 0b1;
        const WRITE = 0b10;
    }
}

bitflags::bitflags! {
    /// Permission bits for operating on a directory.
    ///
    /// Directories can be limited to being readonly. This will restrict what
    /// can be done with them, for example preventing creation of new files.
    #[derive(Copy, Clone, Debug, PartialEq, Eq)]
    pub struct DirPerms: usize {
        /// This directory can be read, for example its entries can be iterated
        /// over and files can be opened.
        const READ = 0b1;

        /// This directory can be mutated, for example by creating new files
        /// within it.
        const MUTATE = 0b10;
    }
}