Revision control
Copy as Markdown
Other Tools
// Licensed under the Apache License, Version 2.0
// All files in the project carrying such notice may not be copied, modified, or distributed
// except according to those terms.
use error::{Error, Result};
use std::{
ops::Deref,
os::windows::io::{AsRawHandle, FromRawHandle, IntoRawHandle},
ptr::null_mut,
};
use winapi::{
um::{
handleapi::{CloseHandle, DuplicateHandle},
processthreadsapi::GetCurrentProcess,
winnt::{DUPLICATE_SAME_ACCESS, HANDLE},
},
shared::minwindef::FALSE,
};
pub struct Handle(HANDLE);
impl Handle {
// Takes ownership of the handle
pub unsafe fn new(handle: HANDLE) -> Handle {
Handle(handle)
}
pub fn close(self) -> Result<()> {
match unsafe { CloseHandle(self.into_raw_handle()) } {
0 => Error::last(),
_ => Ok(()),
}
}
// Duplicates the handle without taking ownership
pub unsafe fn duplicate_from(handle: HANDLE) -> Result<Handle> {
let mut new_handle = null_mut();
let res = DuplicateHandle(
GetCurrentProcess(), handle, GetCurrentProcess(),
&mut new_handle, 0, FALSE, DUPLICATE_SAME_ACCESS,
);
match res {
0 => Error::last(),
_ => Ok(Handle(new_handle)),
}
}
}
impl AsRawHandle for Handle {
fn as_raw_handle(&self) -> HANDLE {
self.0
}
}
impl Deref for Handle {
type Target = HANDLE;
fn deref(&self) -> &HANDLE { &self.0 }
}
impl Drop for Handle {
fn drop(&mut self) {
let ret = unsafe { CloseHandle(self.0) };
let err: Result<()> = Error::last();
assert!(ret != 0, "{:?}", err);
}
}
impl FromRawHandle for Handle {
unsafe fn from_raw_handle(handle: HANDLE) -> Handle {
Handle(handle)
}
}
impl IntoRawHandle for Handle {
fn into_raw_handle(self) -> HANDLE {
self.0
}
}