Struct virtual_fs::mem_fs::file::FileHandle

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pub(super) struct FileHandle {
    inode: usize,
    filesystem: FileSystem,
    readable: bool,
    writable: bool,
    append_mode: bool,
    cursor: u64,
    arc_file: Option<Result<Box<dyn VirtualFile + Send + Sync + 'static>>>,
}
Expand description

A file handle. The file system doesn’t return the File type directly, but rather this FileHandle type, which contains the inode, the flags, and (a light copy of) the filesystem. For each operations, it is checked that the permissions allow the operations to be executed, and then it is checked that the file still exists in the file system. After that, the operation is delegated to the file itself.

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§inode: usize§filesystem: FileSystem§readable: bool§writable: bool§append_mode: bool§cursor: u64§arc_file: Option<Result<Box<dyn VirtualFile + Send + Sync + 'static>>>

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impl FileHandle

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pub(super) fn new( inode: usize, filesystem: FileSystem, readable: bool, writable: bool, append_mode: bool, cursor: u64, ) -> Self

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fn lazy_load_arc_file_mut(&mut self) -> Result<&mut dyn VirtualFile>

Trait Implementations§

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impl AsyncRead for FileHandle

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fn poll_read( self: Pin<&mut Self>, cx: &mut Context<'_>, buf: &mut ReadBuf<'_>, ) -> Poll<Result<()>>

Attempts to read from the AsyncRead into buf. Read more
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impl AsyncSeek for FileHandle

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fn start_seek(self: Pin<&mut Self>, position: SeekFrom) -> Result<()>

Attempts to seek to an offset, in bytes, in a stream. Read more
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fn poll_complete( self: Pin<&mut Self>, cx: &mut Context<'_>, ) -> Poll<Result<u64>>

Waits for a seek operation to complete. Read more
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impl AsyncWrite for FileHandle

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fn poll_write( self: Pin<&mut Self>, cx: &mut Context<'_>, buf: &[u8], ) -> Poll<Result<usize>>

Attempt to write bytes from buf into the object. Read more
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fn poll_write_vectored( self: Pin<&mut Self>, cx: &mut Context<'_>, bufs: &[IoSlice<'_>], ) -> Poll<Result<usize>>

Like poll_write, except that it writes from a slice of buffers. Read more
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fn poll_flush(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<()>>

Attempts to flush the object, ensuring that any buffered data reach their destination. Read more
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fn poll_shutdown(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<()>>

Initiates or attempts to shut down this writer, returning success when the I/O connection has completely shut down. Read more
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fn is_write_vectored(&self) -> bool

Determines if this writer has an efficient poll_write_vectored implementation. Read more
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impl Clone for FileHandle

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fn clone(&self) -> Self

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for FileHandle

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

Formats the value using the given formatter. Read more
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impl VirtualFile for FileHandle

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fn last_accessed(&self) -> u64

the last time the file was accessed in nanoseconds as a UNIX timestamp
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fn last_modified(&self) -> u64

the last time the file was modified in nanoseconds as a UNIX timestamp
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fn created_time(&self) -> u64

the time at which the file was created in nanoseconds as a UNIX timestamp
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fn set_times(&mut self, atime: Option<u64>, mtime: Option<u64>) -> Result<()>

sets accessed and modified time
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fn size(&self) -> u64

the size of the file in bytes
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fn set_len(&mut self, new_size: u64) -> Result<()>

Change the size of the file, if the new_size is greater than the current size the extra bytes will be allocated and zeroed
Request deletion of the file
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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
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fn copy_reference( &mut self, src: Box<dyn VirtualFile + Send + Sync + 'static>, ) -> BoxFuture<'_, Result<()>>

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

Polls the file for when there is data to be read
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fn poll_write_ready( self: Pin<&mut Self>, cx: &mut Context<'_>, ) -> Poll<Result<usize>>

Polls the file for when it is available for writing
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fn write_from_mmap(&mut self, offset: u64, size: u64) -> Result<()>

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

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<R> AsyncReadExt for R
where R: AsyncRead + ?Sized,

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

Creates a new AsyncRead instance that chains this stream with next. Read more
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fn read<'a>(&'a mut self, buf: &'a mut [u8]) -> Read<'a, Self>
where Self: Unpin,

Pulls some bytes from this source into the specified buffer, returning how many bytes were read. Read more
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fn read_buf<'a, B>(&'a mut self, buf: &'a mut B) -> ReadBuf<'a, Self, B>
where Self: Unpin, B: BufMut + ?Sized,

Pulls some bytes from this source into the specified buffer, advancing the buffer’s internal cursor. Read more
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fn read_exact<'a>(&'a mut self, buf: &'a mut [u8]) -> ReadExact<'a, Self>
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Reads the exact number of bytes required to fill buf. Read more
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fn read_u8(&mut self) -> ReadU8<&mut Self>
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Reads an unsigned 8 bit integer from the underlying reader. Read more
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fn read_i8(&mut self) -> ReadI8<&mut Self>
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Reads a signed 8 bit integer from the underlying reader. Read more
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fn read_u16(&mut self) -> ReadU16<&mut Self>
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Reads an unsigned 16-bit integer in big-endian order from the underlying reader. Read more
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Reads a signed 16-bit integer in big-endian order from the underlying reader. Read more
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fn read_u32(&mut self) -> ReadU32<&mut Self>
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Reads an unsigned 32-bit integer in big-endian order from the underlying reader. Read more
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fn read_i32(&mut self) -> ReadI32<&mut Self>
where Self: Unpin,

Reads a signed 32-bit integer in big-endian order from the underlying reader. Read more
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fn read_u64(&mut self) -> ReadU64<&mut Self>
where Self: Unpin,

Reads an unsigned 64-bit integer in big-endian order from the underlying reader. Read more
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fn read_i64(&mut self) -> ReadI64<&mut Self>
where Self: Unpin,

Reads an signed 64-bit integer in big-endian order from the underlying reader. Read more
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fn read_u128(&mut self) -> ReadU128<&mut Self>
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Reads an unsigned 128-bit integer in big-endian order from the underlying reader. Read more
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fn read_i128(&mut self) -> ReadI128<&mut Self>
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Reads an 32-bit floating point type in big-endian order from the underlying reader. Read more
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fn read_f64(&mut self) -> ReadF64<&mut Self>
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fn read_u16_le(&mut self) -> ReadU16Le<&mut Self>
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Reads an unsigned 16-bit integer in little-endian order from the underlying reader. Read more
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fn read_i16_le(&mut self) -> ReadI16Le<&mut Self>
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Reads a signed 16-bit integer in little-endian order from the underlying reader. Read more
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fn read_u32_le(&mut self) -> ReadU32Le<&mut Self>
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Reads an unsigned 32-bit integer in little-endian order from the underlying reader. Read more
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Reads a signed 32-bit integer in little-endian order from the underlying reader. Read more
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Reads an unsigned 128-bit integer in little-endian order from the underlying reader. Read more
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fn read_i128_le(&mut self) -> ReadI128Le<&mut Self>
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Reads an signed 128-bit integer in little-endian order from the underlying reader. Read more
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where Self: Unpin,

Reads an 32-bit floating point type in little-endian order from the underlying reader. Read more
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fn read_f64_le(&mut self) -> ReadF64Le<&mut Self>
where Self: Unpin,

Reads an 64-bit floating point type in little-endian order from the underlying reader. Read more
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fn read_to_end<'a>(&'a mut self, buf: &'a mut Vec<u8>) -> ReadToEnd<'a, Self>
where Self: Unpin,

Reads all bytes until EOF in this source, placing them into buf. Read more
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fn read_to_string<'a>( &'a mut self, dst: &'a mut String, ) -> ReadToString<'a, Self>
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Reads all bytes until EOF in this source, appending them to buf. Read more
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fn take(self, limit: u64) -> Take<Self>
where Self: Sized,

Creates an adaptor which reads at most limit bytes from it. Read more
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impl<S> AsyncSeekExt for S
where S: AsyncSeek + ?Sized,

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fn seek(&mut self, pos: SeekFrom) -> Seek<'_, Self>
where Self: Unpin,

Creates a future which will seek an IO object, and then yield the new position in the object and the object itself. Read more
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fn rewind(&mut self) -> Seek<'_, Self>
where Self: Unpin,

Creates a future which will rewind to the beginning of the stream. Read more
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fn stream_position(&mut self) -> Seek<'_, Self>
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Creates a future which will return the current seek position from the start of the stream. Read more
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impl<W> AsyncWriteExt for W
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fn write<'a>(&'a mut self, src: &'a [u8]) -> Write<'a, Self>
where Self: Unpin,

Writes a buffer into this writer, returning how many bytes were written. Read more
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fn write_vectored<'a, 'b>( &'a mut self, bufs: &'a [IoSlice<'b>], ) -> WriteVectored<'a, 'b, Self>
where Self: Unpin,

Like write, except that it writes from a slice of buffers. Read more
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fn write_buf<'a, B>(&'a mut self, src: &'a mut B) -> WriteBuf<'a, Self, B>
where Self: Sized + Unpin, B: Buf,

Writes a buffer into this writer, advancing the buffer’s internal cursor. Read more
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fn write_all_buf<'a, B>( &'a mut self, src: &'a mut B, ) -> WriteAllBuf<'a, Self, B>
where Self: Sized + Unpin, B: Buf,

Attempts to write an entire buffer into this writer. Read more
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fn write_all<'a>(&'a mut self, src: &'a [u8]) -> WriteAll<'a, Self>
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Attempts to write an entire buffer into this writer. Read more
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fn write_u8(&mut self, n: u8) -> WriteU8<&mut Self>
where Self: Unpin,

Writes an unsigned 8-bit integer to the underlying writer. Read more
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fn write_i8(&mut self, n: i8) -> WriteI8<&mut Self>
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Writes a signed 8-bit integer to the underlying writer. Read more
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fn write_u16(&mut self, n: u16) -> WriteU16<&mut Self>
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Writes an unsigned 16-bit integer in big-endian order to the underlying writer. Read more
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fn write_i16(&mut self, n: i16) -> WriteI16<&mut Self>
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Writes a signed 16-bit integer in big-endian order to the underlying writer. Read more
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fn write_u32(&mut self, n: u32) -> WriteU32<&mut Self>
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Writes an unsigned 32-bit integer in big-endian order to the underlying writer. Read more
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fn write_i32(&mut self, n: i32) -> WriteI32<&mut Self>
where Self: Unpin,

Writes a signed 32-bit integer in big-endian order to the underlying writer. Read more
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fn write_u64(&mut self, n: u64) -> WriteU64<&mut Self>
where Self: Unpin,

Writes an unsigned 64-bit integer in big-endian order to the underlying writer. Read more
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fn write_i64(&mut self, n: i64) -> WriteI64<&mut Self>
where Self: Unpin,

Writes an signed 64-bit integer in big-endian order to the underlying writer. Read more
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fn write_u128(&mut self, n: u128) -> WriteU128<&mut Self>
where Self: Unpin,

Writes an unsigned 128-bit integer in big-endian order to the underlying writer. Read more
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fn write_i128(&mut self, n: i128) -> WriteI128<&mut Self>
where Self: Unpin,

Writes an signed 128-bit integer in big-endian order to the underlying writer. Read more
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fn write_f32(&mut self, n: f32) -> WriteF32<&mut Self>
where Self: Unpin,

Writes an 32-bit floating point type in big-endian order to the underlying writer. Read more
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fn write_f64(&mut self, n: f64) -> WriteF64<&mut Self>
where Self: Unpin,

Writes an 64-bit floating point type in big-endian order to the underlying writer. Read more
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fn write_u16_le(&mut self, n: u16) -> WriteU16Le<&mut Self>
where Self: Unpin,

Writes an unsigned 16-bit integer in little-endian order to the underlying writer. Read more
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fn write_i16_le(&mut self, n: i16) -> WriteI16Le<&mut Self>
where Self: Unpin,

Writes a signed 16-bit integer in little-endian order to the underlying writer. Read more
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fn write_u32_le(&mut self, n: u32) -> WriteU32Le<&mut Self>
where Self: Unpin,

Writes an unsigned 32-bit integer in little-endian order to the underlying writer. Read more
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fn write_i32_le(&mut self, n: i32) -> WriteI32Le<&mut Self>
where Self: Unpin,

Writes a signed 32-bit integer in little-endian order to the underlying writer. Read more
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fn write_u64_le(&mut self, n: u64) -> WriteU64Le<&mut Self>
where Self: Unpin,

Writes an unsigned 64-bit integer in little-endian order to the underlying writer. Read more
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fn write_i64_le(&mut self, n: i64) -> WriteI64Le<&mut Self>
where Self: Unpin,

Writes an signed 64-bit integer in little-endian order to the underlying writer. Read more
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fn write_u128_le(&mut self, n: u128) -> WriteU128Le<&mut Self>
where Self: Unpin,

Writes an unsigned 128-bit integer in little-endian order to the underlying writer. Read more
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fn write_i128_le(&mut self, n: i128) -> WriteI128Le<&mut Self>
where Self: Unpin,

Writes an signed 128-bit integer in little-endian order to the underlying writer. Read more
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fn write_f32_le(&mut self, n: f32) -> WriteF32Le<&mut Self>
where Self: Unpin,

Writes an 32-bit floating point type in little-endian order to the underlying writer. Read more
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fn write_f64_le(&mut self, n: f64) -> WriteF64Le<&mut Self>
where Self: Unpin,

Writes an 64-bit floating point type in little-endian order to the underlying writer. Read more
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fn flush(&mut self) -> Flush<'_, Self>
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Flushes this output stream, ensuring that all intermediately buffered contents reach their destination. Read more
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Shuts down the output stream, ensuring that the value can be dropped cleanly. Read more
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🔬This is a nightly-only experimental API. (clone_to_uninit)
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