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// SPDX-License-Identifier: MIT OR Apache-2.0
use polling::{Event, Poller};
use std::fmt;
use std::io::Result;
use std::os::unix::io::{AsFd, AsRawFd, BorrowedFd, RawFd};
/// The raw registration into the reactor.
#[doc(hidden)]
pub struct Registration {
/// Raw file descriptor on Unix.
///
/// # Invariant
///
/// This describes a valid file descriptor that has not been `close`d. It will not be
/// closed while this object is alive.
raw: RawFd,
}
impl fmt::Debug for Registration {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
fmt::Debug::fmt(&self.raw, f)
}
}
impl Registration {
/// Add this file descriptor into the reactor.
///
/// # Safety
///
/// The provided file descriptor must be valid and not be closed while this object is alive.
pub(crate) unsafe fn new(f: impl AsFd) -> Self {
Self {
raw: f.as_fd().as_raw_fd(),
}
}
/// Registers the object into the reactor.
#[inline]
pub(crate) fn add(&self, poller: &Poller, token: usize) -> Result<()> {
// SAFETY: This object's existence validates the invariants of Poller::add
unsafe { poller.add(self.raw, Event::none(token)) }
}
/// Re-registers the object into the reactor.
#[inline]
pub(crate) fn modify(&self, poller: &Poller, interest: Event) -> Result<()> {
// SAFETY: self.raw is a valid file descriptor
let fd = unsafe { BorrowedFd::borrow_raw(self.raw) };
poller.modify(fd, interest)
}
/// Deregisters the object from the reactor.
#[inline]
pub(crate) fn delete(&self, poller: &Poller) -> Result<()> {
// SAFETY: self.raw is a valid file descriptor
let fd = unsafe { BorrowedFd::borrow_raw(self.raw) };
poller.delete(fd)
}
}
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