Struct wasmer_wasi::Stderr

pub struct Stderr;

A wrapper type around Stderr that implements VirtualFile and Serialize + Deserialize.

Trait Implementations

impl Debug for Stderr

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl Default for Stderr

fn default() -> Stderr

Returns the “default value” for a type.

impl Read for Stderr

fn read(&mut self, _buf: &mut [u8]) -> Result<usize, Error>

Pull some bytes from this source into the specified buffer, returning how many bytes were read.

fn read_to_end(&mut self, _buf: &mut Vec<u8, Global>) -> Result<usize, Error>

Read all bytes until EOF in this source, placing them into buf.

fn read_to_string(&mut self, _buf: &mut String) -> Result<usize, Error>

Read all bytes until EOF in this source, appending them to buf.

fn read_exact(&mut self, _buf: &mut [u8]) -> Result<(), Error>

Read the exact number of bytes required to fill buf.

fn read_vectored(&mut self, bufs: &mut [IoSliceMut<'_>]) -> Result<usize, Error>

Like read, except that it reads into a slice of buffers.

fn is_read_vectored(&self) -> bool

🔬This is a nightly-only experimental API. (can_vector)

Determines if this Reader has an efficient read_vectored implementation.

fn read_buf(&mut self, buf: BorrowedCursor<'_>) -> Result<(), Error>

🔬This is a nightly-only experimental API. (read_buf)

Pull some bytes from this source into the specified buffer.

fn read_buf_exact(&mut self, cursor: BorrowedCursor<'_>) -> Result<(), Error>

🔬This is a nightly-only experimental API. (read_buf)

Read the exact number of bytes required to fill cursor.

fn by_ref(&mut self) -> &mut Selfwhere
    Self: Sized,

Creates a “by reference” adaptor for this instance of Read.

fn bytes(self) -> Bytes<Self>where
    Self: Sized,

Transforms this Read instance to an Iterator over its bytes.

fn chain<R>(self, next: R) -> Chain<Self, R>where
    R: Read,
    Self: Sized,

Creates an adapter which will chain this stream with another.

fn take(self, limit: u64) -> Take<Self>where
    Self: Sized,

Creates an adapter which will read at most limit bytes from it.

impl Seek for Stderr

fn seek(&mut self, _pos: SeekFrom) -> Result<u64, Error>

Seek to an offset, in bytes, in a stream.

fn rewind(&mut self) -> Result<(), Error>

Rewind to the beginning of a stream.

fn stream_len(&mut self) -> Result<u64, Error>

🔬This is a nightly-only experimental API. (seek_stream_len)

Returns the length of this stream (in bytes).

fn stream_position(&mut self) -> Result<u64, Error>

Returns the current seek position from the start of the stream.

impl VirtualFile for Stderr

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 bytes_available(&self) -> Result<usize, FsError>

Returns the number of bytes available. This function must not block

fn get_fd(&self) -> Option<FileDescriptor>

Used for polling. Default returns None because this method cannot be implemented for most types Returns the underlying host fd

fn sync_to_disk(&self) -> Result<(), FsError>

Store file contents and metadata to disk Default implementation returns Ok(()). You should implement this method if you care about flushing your cache to permanent storage

fn bytes_available_read(&self) -> Result<Option<usize>, FsError>

Returns the number of bytes available. This function must not block Defaults to None which means the number of bytes is unknown

fn bytes_available_write(&self) -> Result<Option<usize>, FsError>

Returns the number of bytes available. This function must not block Defaults to None which means the number of bytes is unknown

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

impl Write for Stderr

fn write(&mut self, buf: &[u8]) -> Result<usize, Error>

Write a buffer into this writer, returning how many bytes were written.

fn flush(&mut self) -> Result<(), Error>

Flush this output stream, ensuring that all intermediately buffered contents reach their destination.

fn write_all(&mut self, buf: &[u8]) -> Result<(), Error>

Attempts to write an entire buffer into this writer.

fn write_fmt(&mut self, fmt: Arguments<'_>) -> Result<(), Error>

Writes a formatted string into this writer, returning any error encountered.

fn write_vectored(&mut self, bufs: &[IoSlice<'_>]) -> Result<usize, Error>

Like write, except that it writes from a slice of buffers.

fn is_write_vectored(&self) -> bool

🔬This is a nightly-only experimental API. (can_vector)

Determines if this Writer has an efficient write_vectored implementation.

fn write_all_vectored(&mut self, bufs: &mut [IoSlice<'_>]) -> Result<(), Error>

🔬This is a nightly-only experimental API. (write_all_vectored)

Attempts to write multiple buffers into this writer.

fn by_ref(&mut self) -> &mut Selfwhere
    Self: Sized,

Creates a “by reference” adapter for this instance of Write.