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use std::io;
use std::mem;
use windows_sys::Win32::Foundation::BOOL;
use windows_sys::Win32::System::IO::OVERLAPPED;
/// A wrapper around `OVERLAPPED` to provide "rustic" accessors and
/// initializers.
pub(crate) struct Overlapped(OVERLAPPED);
impl Overlapped {
/// Creates a new zeroed out instance of an overlapped I/O tracking state.
///
/// This is suitable for passing to methods which will then later get
/// notified via an I/O Completion Port.
pub(crate) fn zero() -> Overlapped {
Overlapped(unsafe { mem::zeroed() })
}
/// Gain access to the raw underlying data
pub(crate) fn raw(&self) -> *mut OVERLAPPED {
&self.0 as *const _ as *mut _
}
}
/// Convert a system call which returns a `BOOL` to an `io::Result`.
pub(crate) fn syscall(status: BOOL) -> std::io::Result<()> {
if status == 0 {
Err(io::Error::last_os_error())
} else {
Ok(())
}
}
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