Struct virtual_fs::mem_fs::file::FileHandle
source · 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.
Fields§
§inode: usize
§filesystem: FileSystem
§readable: bool
§writable: bool
§append_mode: bool
§cursor: u64
§arc_file: Option<Result<Box<dyn VirtualFile + Send + Sync + 'static>>>
Implementations§
source§impl FileHandle
impl FileHandle
pub(super) fn new( inode: usize, filesystem: FileSystem, readable: bool, writable: bool, append_mode: bool, cursor: u64, ) -> Self
fn lazy_load_arc_file_mut(&mut self) -> Result<&mut dyn VirtualFile>
Trait Implementations§
source§impl AsyncRead for FileHandle
impl AsyncRead for FileHandle
source§impl AsyncSeek for FileHandle
impl AsyncSeek for FileHandle
source§impl AsyncWrite for FileHandle
impl AsyncWrite for FileHandle
source§fn poll_write(
self: Pin<&mut Self>,
cx: &mut Context<'_>,
buf: &[u8],
) -> Poll<Result<usize>>
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 moresource§fn poll_write_vectored(
self: Pin<&mut Self>,
cx: &mut Context<'_>,
bufs: &[IoSlice<'_>],
) -> Poll<Result<usize>>
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 moresource§fn poll_flush(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<()>>
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
source§fn poll_shutdown(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<()>>
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
source§fn is_write_vectored(&self) -> bool
fn is_write_vectored(&self) -> bool
Determines if this writer has an efficient
poll_write_vectored
implementation. Read moresource§impl Clone for FileHandle
impl Clone for FileHandle
source§impl Debug for FileHandle
impl Debug for FileHandle
source§impl VirtualFile for FileHandle
impl VirtualFile for FileHandle
source§fn last_accessed(&self) -> u64
fn last_accessed(&self) -> u64
the last time the file was accessed in nanoseconds as a UNIX timestamp
source§fn last_modified(&self) -> u64
fn last_modified(&self) -> u64
the last time the file was modified in nanoseconds as a UNIX timestamp
source§fn created_time(&self) -> u64
fn created_time(&self) -> u64
the time at which the file was created in nanoseconds as a UNIX timestamp
source§fn set_times(&mut self, atime: Option<u64>, mtime: Option<u64>) -> Result<()>
fn set_times(&mut self, atime: Option<u64>, mtime: Option<u64>) -> Result<()>
sets accessed and modified time
source§fn set_len(&mut self, new_size: u64) -> Result<()>
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 zeroedsource§fn get_special_fd(&self) -> Option<u32>
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 filessource§fn copy_reference(
&mut self,
src: Box<dyn VirtualFile + Send + Sync + 'static>,
) -> BoxFuture<'_, Result<()>>
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
source§fn poll_read_ready(
self: Pin<&mut Self>,
cx: &mut Context<'_>,
) -> Poll<Result<usize>>
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
source§fn poll_write_ready(
self: Pin<&mut Self>,
cx: &mut Context<'_>,
) -> Poll<Result<usize>>
fn poll_write_ready( self: Pin<&mut Self>, cx: &mut Context<'_>, ) -> Poll<Result<usize>>
Polls the file for when it is available for writing
Auto Trait Implementations§
impl Freeze for FileHandle
impl !RefUnwindSafe for FileHandle
impl Send for FileHandle
impl Sync for FileHandle
impl Unpin for FileHandle
impl !UnwindSafe for FileHandle
Blanket Implementations§
§impl<R> AsyncReadExt for R
impl<R> AsyncReadExt for R
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Self: Unpin,
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
§fn read_buf<'a, B>(&'a mut self, buf: &'a mut B) -> ReadBuf<'a, Self, B>
fn read_buf<'a, B>(&'a mut self, buf: &'a mut B) -> ReadBuf<'a, Self, B>
Pulls some bytes from this source into the specified buffer,
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Reads the exact number of bytes required to fill
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