Trait wasmer_vfs::VirtualFile
source · [−]pub trait VirtualFile: Debug + Write + Read + Seek + Upcastable {
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<()>;
fn unlink(&mut self) -> Result<()>;
fn sync_to_disk(&self) -> Result<()> { ... }
fn bytes_available(&self) -> Result<usize> { ... }
fn bytes_available_read(&self) -> Result<Option<usize>> { ... }
fn bytes_available_write(&self) -> Result<Option<usize>> { ... }
fn is_open(&self) -> bool { ... }
fn get_fd(&self) -> Option<FileDescriptor> { ... }
}
Expand description
This trait relies on your file closing when it goes out of scope via Drop
Required Methods
sourcefn last_accessed(&self) -> u64
fn last_accessed(&self) -> u64
the last time the file was accessed in nanoseconds as a UNIX timestamp
sourcefn last_modified(&self) -> u64
fn last_modified(&self) -> u64
the last time the file was modified in nanoseconds as a UNIX timestamp
sourcefn created_time(&self) -> u64
fn created_time(&self) -> u64
the time at which the file was created in nanoseconds as a UNIX timestamp
Change the size of the file, if the new_size
is greater than the current size
the extra bytes will be allocated and zeroed
Provided Methods
sourcefn sync_to_disk(&self) -> Result<()>
fn sync_to_disk(&self) -> Result<()>
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
sourcefn bytes_available(&self) -> Result<usize>
fn bytes_available(&self) -> Result<usize>
Returns the number of bytes available. This function must not block
sourcefn bytes_available_read(&self) -> Result<Option<usize>>
fn bytes_available_read(&self) -> Result<Option<usize>>
Returns the number of bytes available. This function must not block
Defaults to None
which means the number of bytes is unknown
sourcefn bytes_available_write(&self) -> Result<Option<usize>>
fn bytes_available_write(&self) -> Result<Option<usize>>
Returns the number of bytes available. This function must not block
Defaults to None
which means the number of bytes is unknown
Indicates if the file is opened or closed. This function must not block Defaults to a status of being constantly open
sourcefn get_fd(&self) -> Option<FileDescriptor>
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