pub struct Event {
pub val: Cell<u64>,
}
Expand description
A kind of file descriptor created by eventfd
.
The Event
type isn’t currently written to by eventfd
.
The interface is meant to keep track of objects associated
with a file descriptor. For more information see the man
page below:
Fields§
§val: Cell<u64>
The object contains an unsigned 64-bit integer (uint64_t) counter that is maintained by the kernel. This counter is initialized with the value specified in the argument initval.
Trait Implementations§
source§impl FileDescriptor for Event
impl FileDescriptor for Event
source§fn write<'tcx>(
&self,
_communicate_allowed: bool,
bytes: &[u8],
tcx: TyCtxt<'tcx>
) -> InterpResult<'tcx, Result<usize>>
fn write<'tcx>( &self, _communicate_allowed: bool, bytes: &[u8], tcx: TyCtxt<'tcx> ) -> InterpResult<'tcx, Result<usize>>
A write call adds the 8-byte integer value supplied in its buffer (in native endianess) to the counter. The maximum value that may be stored in the counter is the largest unsigned 64-bit value minus 1 (i.e., 0xfffffffffffffffe). If the addition would cause the counter’s value to exceed the maximum, then the write either blocks until a read is performed on the file descriptor, or fails with the error EAGAIN if the file descriptor has been made nonblocking. A write fails with the error EINVAL if the size of the supplied buffer is less than 8 bytes, or if an attempt is made to write the value 0xffffffffffffffff.
fn name(&self) -> &'static str
fn dup(&mut self) -> Result<Box<dyn FileDescriptor>>
fn close<'tcx>( self: Box<Self>, _communicate_allowed: bool ) -> InterpResult<'tcx, Result<i32>>
fn read<'tcx>( &mut self, _communicate_allowed: bool, _bytes: &mut [u8], _tcx: TyCtxt<'tcx> ) -> InterpResult<'tcx, Result<usize>>
fn seek<'tcx>( &mut self, _communicate_allowed: bool, _offset: SeekFrom ) -> InterpResult<'tcx, Result<u64>>
fn is_tty(&self) -> bool
fn as_unix_host_fd(&self) -> Option<i32>
Auto Trait Implementations§
impl !RefUnwindSafe for Event
impl Send for Event
impl !Sync for Event
impl Unpin for Event
impl UnwindSafe for Event
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Layout§
Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...)
attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.
Size: 8 bytes