Trait wasmer_wasix::syscalls::VirtualFile

pub(crate) trait VirtualFile: Debug + AsyncRead + AsyncWrite + AsyncSeek + Unpin + Upcastable + Send {
    // Required methods
    fn last_accessed(&self) -> u64;
    fn last_modified(&self) -> u64;
    fn created_time(&self) -> u64;
    fn size(&self) -> u64;
    fn set_len(&mut self, new_size: u64) -> Result<(), FsError>;
    fn unlink(&mut self) -> Result<(), FsError>;
    fn poll_read_ready(
        self: Pin<&mut Self>,
        cx: &mut Context<'_>,
    ) -> Poll<Result<usize, Error>>;
    fn poll_write_ready(
        self: Pin<&mut Self>,
        cx: &mut Context<'_>,
    ) -> Poll<Result<usize, Error>>;

    // Provided methods
    fn set_times(
        &mut self,
        atime: Option<u64>,
        mtime: Option<u64>,
    ) -> Result<(), FsError> { ... }
    fn is_open(&self) -> bool { ... }
    fn get_special_fd(&self) -> Option<u32> { ... }
    fn write_from_mmap(&mut self, _offset: u64, _len: u64) -> Result<(), Error> { ... }
    fn copy_reference(
        &mut self,
        src: Box<dyn VirtualFile + Send + Sync>,
    ) -> Pin<Box<dyn Future<Output = Result<(), Error>> + Send + '_>> { ... }
}

This trait relies on your file closing when it goes out of scope via Drop

Required Methods

fn last_accessed(&self) -> u64

the last time the file was accessed in nanoseconds as a UNIX timestamp

fn last_modified(&self) -> u64

the last time the file was modified in nanoseconds as a UNIX timestamp

fn created_time(&self) -> u64

the time at which the file was created in nanoseconds as a UNIX timestamp

fn size(&self) -> u64

the size of the file in bytes

fn set_len(&mut self, new_size: u64) -> Result<(), FsError>

Change the size of the file, if the new_size is greater than the current size the extra bytes will be allocated and zeroed

fn unlink(&mut self) -> Result<(), FsError>

Request deletion of the file

fn poll_read_ready( self: Pin<&mut Self>, cx: &mut Context<'_>, ) -> Poll<Result<usize, Error>>

Polls the file for when there is data to be read

fn poll_write_ready( self: Pin<&mut Self>, cx: &mut Context<'_>, ) -> Poll<Result<usize, Error>>

Polls the file for when it is available for writing

Provided Methods

fn set_times( &mut self, atime: Option<u64>, mtime: Option<u64>, ) -> Result<(), FsError>

sets accessed and modified time

fn is_open(&self) -> bool

Indicates if the file is opened or closed. This function must not block Defaults to a status of being constantly open

fn get_special_fd(&self) -> Option<u32>

Used for “special” files such as stdin, stdout and stderr. Always returns the same file descriptor (0, 1 or 2). Returns None on normal files

fn write_from_mmap(&mut self, _offset: u64, _len: u64) -> Result<(), Error>

Writes to this file using an mmap offset and reference (this method only works for mmap optimized file systems)

fn copy_reference( &mut self, src: Box<dyn VirtualFile + Send + Sync>, ) -> Pin<Box<dyn Future<Output = Result<(), Error>> + Send + '_>>

This method will copy a file from a source to this destination where the default is to do a straight byte copy however file system implementors may optimize this to do a zero copy

Implementors

impl VirtualFile for WasiStateFileGuard

impl VirtualFile for wasmer_wasix::state::types::Stderr

impl VirtualFile for wasmer_wasix::state::types::Stdin

impl VirtualFile for wasmer_wasix::state::types::Stdout

impl VirtualFile for Pipe

impl VirtualFile for ArcBoxFile

impl VirtualFile for BufferFile

impl VirtualFile for CombineFile

impl VirtualFile for CopyOnWriteFile

impl VirtualFile for DeviceFile

impl VirtualFile for DualWriteFile

impl VirtualFile for File

impl VirtualFile for NullFile

impl VirtualFile for RandomFile

impl VirtualFile for StaticFile

impl VirtualFile for Stderr

impl VirtualFile for Stdin

impl VirtualFile for Stdout

impl VirtualFile for WebCFile

impl VirtualFile for ZeroFile

impl<T> VirtualFile for ArcFile<T>

where T: VirtualFile + Send + Sync + 'static,