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//! Based on [heim's](https://github.com/heim-rs/heim/blob/master/heim-common/src/sys/macos/iokit/io_iterator.rs).
//! implementation.
use std::ops::{Deref, DerefMut};
use mach2::kern_return;
use super::{bindings::*, io_object::IoObject};
/// Safe wrapper around the IOKit `io_iterator_t` type.
#[derive(Debug)]
pub struct IoIterator(io_iterator_t);
impl From<io_iterator_t> for IoIterator {
fn from(iter: io_iterator_t) -> IoIterator {
IoIterator(iter)
}
}
impl Deref for IoIterator {
type Target = io_iterator_t;
fn deref(&self) -> &Self::Target {
&self.0
}
}
impl DerefMut for IoIterator {
fn deref_mut(&mut self) -> &mut Self::Target {
&mut self.0
}
}
impl Iterator for IoIterator {
type Item = IoObject;
fn next(&mut self) -> Option<Self::Item> {
// Basically, we just stop when we hit 0.
// SAFETY: IOKit call, the passed argument (an `io_iterator_t`) is what is expected.
match unsafe { IOIteratorNext(self.0) } {
0 => None,
io_object => Some(IoObject::from(io_object)),
}
}
}
impl Drop for IoIterator {
fn drop(&mut self) {
// SAFETY: IOKit call, the passed argument (an `io_iterator_t`) is what is expected.
let result = unsafe { IOObjectRelease(self.0) };
assert_eq!(result, kern_return::KERN_SUCCESS);
}
}
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