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#![unstable(issue = "none", feature = "windows_handle")]
use crate::cmp;
use crate::io::{self, ErrorKind, IoSlice, IoSliceMut, Read};
use crate::mem;
use crate::os::windows::io::{
AsHandle, AsRawHandle, BorrowedHandle, FromRawHandle, IntoRawHandle, OwnedHandle, RawHandle,
};
use crate::ptr;
use crate::sys::c;
use crate::sys::cvt;
use crate::sys_common::{AsInner, FromInner, IntoInner};
pub struct Handle(OwnedHandle);
impl Handle {
pub fn new_event(manual: bool, init: bool) -> io::Result<Handle> {
unsafe {
let event =
c::CreateEventW(ptr::null_mut(), manual as c::BOOL, init as c::BOOL, ptr::null());
if event.is_null() {
Err(io::Error::last_os_error())
} else {
Ok(Handle::from_raw_handle(event))
}
}
}
}
impl AsInner<OwnedHandle> for Handle {
fn as_inner(&self) -> &OwnedHandle {
&self.0
}
}
impl IntoInner<OwnedHandle> for Handle {
fn into_inner(self) -> OwnedHandle {
self.0
}
}
impl FromInner<OwnedHandle> for Handle {
fn from_inner(file_desc: OwnedHandle) -> Self {
Self(file_desc)
}
}
impl AsHandle for Handle {
fn as_handle(&self) -> BorrowedHandle<'_> {
self.0.as_handle()
}
}
impl AsRawHandle for Handle {
fn as_raw_handle(&self) -> RawHandle {
self.0.as_raw_handle()
}
}
impl IntoRawHandle for Handle {
fn into_raw_handle(self) -> RawHandle {
self.0.into_raw_handle()
}
}
impl FromRawHandle for Handle {
unsafe fn from_raw_handle(raw_handle: RawHandle) -> Self {
Self(FromRawHandle::from_raw_handle(raw_handle))
}
}
impl Handle {
pub fn read(&self, buf: &mut [u8]) -> io::Result<usize> {
let mut read = 0;
let len = cmp::min(buf.len(), <c::DWORD>::MAX as usize) as c::DWORD;
let res = cvt(unsafe {
c::ReadFile(
self.as_raw_handle(),
buf.as_mut_ptr() as c::LPVOID,
len,
&mut read,
ptr::null_mut(),
)
});
match res {
Ok(_) => Ok(read as usize),
Err(ref e) if e.kind() == ErrorKind::BrokenPipe => Ok(0),
Err(e) => Err(e),
}
}
pub fn read_vectored(&self, bufs: &mut [IoSliceMut<'_>]) -> io::Result<usize> {
crate::io::default_read_vectored(|buf| self.read(buf), bufs)
}
#[inline]
pub fn is_read_vectored(&self) -> bool {
false
}
pub fn read_at(&self, buf: &mut [u8], offset: u64) -> io::Result<usize> {
let mut read = 0;
let len = cmp::min(buf.len(), <c::DWORD>::MAX as usize) as c::DWORD;
let res = unsafe {
let mut overlapped: c::OVERLAPPED = mem::zeroed();
overlapped.Offset = offset as u32;
overlapped.OffsetHigh = (offset >> 32) as u32;
cvt(c::ReadFile(
self.as_raw_handle(),
buf.as_mut_ptr() as c::LPVOID,
len,
&mut read,
&mut overlapped,
))
};
match res {
Ok(_) => Ok(read as usize),
Err(ref e) if e.raw_os_error() == Some(c::ERROR_HANDLE_EOF as i32) => Ok(0),
Err(e) => Err(e),
}
}
pub unsafe fn read_overlapped(
&self,
buf: &mut [u8],
overlapped: *mut c::OVERLAPPED,
) -> io::Result<Option<usize>> {
let len = cmp::min(buf.len(), <c::DWORD>::MAX as usize) as c::DWORD;
let mut amt = 0;
let res = cvt(c::ReadFile(
self.as_raw_handle(),
buf.as_ptr() as c::LPVOID,
len,
&mut amt,
overlapped,
));
match res {
Ok(_) => Ok(Some(amt as usize)),
Err(e) => {
if e.raw_os_error() == Some(c::ERROR_IO_PENDING as i32) {
Ok(None)
} else if e.raw_os_error() == Some(c::ERROR_BROKEN_PIPE as i32) {
Ok(Some(0))
} else {
Err(e)
}
}
}
}
pub fn overlapped_result(
&self,
overlapped: *mut c::OVERLAPPED,
wait: bool,
) -> io::Result<usize> {
unsafe {
let mut bytes = 0;
let wait = if wait { c::TRUE } else { c::FALSE };
let res =
cvt(c::GetOverlappedResult(self.as_raw_handle(), overlapped, &mut bytes, wait));
match res {
Ok(_) => Ok(bytes as usize),
Err(e) => {
if e.raw_os_error() == Some(c::ERROR_HANDLE_EOF as i32)
|| e.raw_os_error() == Some(c::ERROR_BROKEN_PIPE as i32)
{
Ok(0)
} else {
Err(e)
}
}
}
}
}
pub fn cancel_io(&self) -> io::Result<()> {
unsafe { cvt(c::CancelIo(self.as_raw_handle())).map(drop) }
}
pub fn write(&self, buf: &[u8]) -> io::Result<usize> {
let mut amt = 0;
let len = cmp::min(buf.len(), <c::DWORD>::MAX as usize) as c::DWORD;
cvt(unsafe {
c::WriteFile(
self.as_raw_handle(),
buf.as_ptr() as c::LPVOID,
len,
&mut amt,
ptr::null_mut(),
)
})?;
Ok(amt as usize)
}
pub fn write_vectored(&self, bufs: &[IoSlice<'_>]) -> io::Result<usize> {
crate::io::default_write_vectored(|buf| self.write(buf), bufs)
}
#[inline]
pub fn is_write_vectored(&self) -> bool {
false
}
pub fn write_at(&self, buf: &[u8], offset: u64) -> io::Result<usize> {
let mut written = 0;
let len = cmp::min(buf.len(), <c::DWORD>::MAX as usize) as c::DWORD;
unsafe {
let mut overlapped: c::OVERLAPPED = mem::zeroed();
overlapped.Offset = offset as u32;
overlapped.OffsetHigh = (offset >> 32) as u32;
cvt(c::WriteFile(
self.as_raw_handle(),
buf.as_ptr() as c::LPVOID,
len,
&mut written,
&mut overlapped,
))?;
}
Ok(written as usize)
}
pub fn duplicate(
&self,
access: c::DWORD,
inherit: bool,
options: c::DWORD,
) -> io::Result<Handle> {
let mut ret = 0 as c::HANDLE;
cvt(unsafe {
let cur_proc = c::GetCurrentProcess();
c::DuplicateHandle(
cur_proc,
self.as_raw_handle(),
cur_proc,
&mut ret,
access,
inherit as c::BOOL,
options,
)
})?;
unsafe { Ok(Handle::from_raw_handle(ret)) }
}
}
impl<'a> Read for &'a Handle {
fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
(**self).read(buf)
}
fn read_vectored(&mut self, bufs: &mut [IoSliceMut<'_>]) -> io::Result<usize> {
(**self).read_vectored(bufs)
}
}