Struct cap_async_std::fs::File

pub struct File { /* fields omitted */ }

A reference to an open file on a filesystem.

This corresponds to async_std::fs::File.

Note that this File has no open or create methods. To open or create a file, you must first obtain a Dir containing the path, and then call Dir::open or Dir::create.

Implementations

impl File

pub fn from_std(std: File, _: AmbientAuthority) -> Self

Constructs a new instance of Self from the given async_std::fs::File.

Ambient Authority

async_std::fs::File is not sandboxed and may access any path that the host process has access to.

pub fn into_std(self) -> File

Consumes self and returns an async_std::fs::File.

pub async fn sync_all(&self) -> Result<()>

Attempts to sync all OS-internal metadata to disk.

This corresponds to async_std::fs::File::sync_all.

pub async fn sync_data(&self) -> Result<()>

This function is similar to sync_all, except that it may not synchronize file metadata to a filesystem.

This corresponds to async_std::fs::File::sync_data.

pub async fn set_len(&self, size: u64) -> Result<()>

Truncates or extends the underlying file, updating the size of this file to become size.

This corresponds to async_std::fs::File::set_len.

pub fn metadata(&self) -> Result<Metadata>

Queries metadata about the underlying file.

This corresponds to async_std::fs::File::metadata.

pub async fn set_permissions(&self, perm: Permissions) -> Result<()>

Changes the permissions on the underlying file.

This corresponds to async_std::fs::File::set_permissions.

pub async fn open_ambient<P: AsRef<Path>>(
    path: P,
    ambient_authority: AmbientAuthority
) -> Result<Self>

Constructs a new instance of Self in read-only mode by opening the given path as a file using the host process’ ambient authority.

Ambient Authority

This function is not sandboxed and may access any path that the host process has access to.

pub async fn open_ambient_with<P: AsRef<Path>>(
    path: P,
    options: &OpenOptions,
    ambient_authority: AmbientAuthority
) -> Result<Self>

Constructs a new instance of Self with the options specified by options by opening the given path as a file using the host process’ ambient authority.

Ambient Authority

This function is not sandboxed and may access any path that the host process has access to.

Trait Implementations

impl AsFd for File

fn as_fd(&self) -> BorrowedFd<'_>

Borrows the file descriptor.

impl AsRawFd for File

fn as_raw_fd(&self) -> RawFd

Extracts the raw file descriptor.

impl AsyncRead for File

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

Attempt to read from the AsyncRead into buf.

fn poll_read_vectored(
    self: Pin<&mut Self>,
    cx: &mut Context<'_>,
    bufs: &mut [IoSliceMut<'_>]
) -> Poll<Result<usize>>

Attempt to read from the AsyncRead into bufs using vectored IO operations.

impl AsyncRead for &File

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

Attempt to read from the AsyncRead into buf.

fn poll_read_vectored(
    self: Pin<&mut Self>,
    cx: &mut Context<'_>,
    bufs: &mut [IoSliceMut<'_>]
) -> Poll<Result<usize>>

Attempt to read from the AsyncRead into bufs using vectored IO operations.

impl AsyncSeek for File

fn poll_seek(
    self: Pin<&mut Self>,
    cx: &mut Context<'_>,
    pos: SeekFrom
) -> Poll<Result<u64>>

Attempt to seek to an offset, in bytes, in a stream.

impl AsyncSeek for &File

fn poll_seek(
    self: Pin<&mut Self>,
    cx: &mut Context<'_>,
    pos: SeekFrom
) -> Poll<Result<u64>>

Attempt to seek to an offset, in bytes, in a stream.

impl AsyncWrite for File

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

Attempt to write bytes from buf into the object.

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

Attempt to flush the object, ensuring that any buffered data reach their destination.

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

Attempt to close the object.

fn poll_write_vectored(
    self: Pin<&mut Self>,
    cx: &mut Context<'_>,
    bufs: &[IoSlice<'_>]
) -> Poll<Result<usize>>

Attempt to write bytes from bufs into the object using vectored IO operations.

impl AsyncWrite for &File

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

Attempt to write bytes from buf into the object.

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

Attempt to flush the object, ensuring that any buffered data reach their destination.

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

Attempt to close the object.

fn poll_write_vectored(
    self: Pin<&mut Self>,
    cx: &mut Context<'_>,
    bufs: &[IoSlice<'_>]
) -> Poll<Result<usize>>

Attempt to write bytes from bufs into the object using vectored IO operations.

impl Clone for File

fn clone(&self) -> File

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for File

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

Formats the value using the given formatter.

impl FromFd for File

fn from_fd(fd: OwnedFd) -> Self

Constructs a new instance of Self from the given file descriptor.

fn from_into_fd<Owned>(into_owned: Owned) -> Self where
    Owned: IntoFd, 

Constructs a new instance of Self from the given file descriptor converted from into_owned.

impl FromRawFd for File

unsafe fn from_raw_fd(fd: RawFd) -> Self

Constructs a new instance of Self from the given raw file descriptor.

impl IntoFd for File

fn into_fd(self) -> OwnedFd

Consumes this object, returning the underlying file descriptor.

impl IntoRawFd for File

fn into_raw_fd(self) -> RawFd

Consumes this object, returning the raw underlying file descriptor.