Remove DWORD

15 files changed, 90 insertions, 105 deletions

diff --git a/library/std/src/process/tests.rs b/library/std/src/process/tests.rs
index b4f6bb71c79..055601d0307 100644
--- a/library/std/src/process/tests.rs
+++ b/library/std/src/process/tests.rs
@@ -385,29 +385,25 @@ fn test_interior_nul_in_env_value_is_error() {
 #[cfg(windows)]
 fn test_creation_flags() {
     use crate::os::windows::process::CommandExt;
-    use crate::sys::c::{BOOL, DWORD, INFINITE};
+    use crate::sys::c::{BOOL, INFINITE};
     #[repr(C)]
     struct DEBUG_EVENT {
-        pub event_code: DWORD,
-        pub process_id: DWORD,
-        pub thread_id: DWORD,
+        pub event_code: u32,
+        pub process_id: u32,
+        pub thread_id: u32,
         // This is a union in the real struct, but we don't
         // need this data for the purposes of this test.
         pub _junk: [u8; 164],
     }
 
     extern "system" {
-        fn WaitForDebugEvent(lpDebugEvent: *mut DEBUG_EVENT, dwMilliseconds: DWORD) -> BOOL;
-        fn ContinueDebugEvent(
-            dwProcessId: DWORD,
-            dwThreadId: DWORD,
-            dwContinueStatus: DWORD,
-        ) -> BOOL;
+        fn WaitForDebugEvent(lpDebugEvent: *mut DEBUG_EVENT, dwMilliseconds: u32) -> BOOL;
+        fn ContinueDebugEvent(dwProcessId: u32, dwThreadId: u32, dwContinueStatus: u32) -> BOOL;
     }
 
-    const DEBUG_PROCESS: DWORD = 1;
-    const EXIT_PROCESS_DEBUG_EVENT: DWORD = 5;
-    const DBG_EXCEPTION_NOT_HANDLED: DWORD = 0x80010001;
+    const DEBUG_PROCESS: u32 = 1;
+    const EXIT_PROCESS_DEBUG_EVENT: u32 = 5;
+    const DBG_EXCEPTION_NOT_HANDLED: u32 = 0x80010001;
 
     let mut child =
         Command::new("cmd").creation_flags(DEBUG_PROCESS).stdin(Stdio::piped()).spawn().unwrap();
diff --git a/library/std/src/sys/pal/windows/alloc.rs b/library/std/src/sys/pal/windows/alloc.rs
index f85d29c00a9..9f0194492b0 100644
--- a/library/std/src/sys/pal/windows/alloc.rs
+++ b/library/std/src/sys/pal/windows/alloc.rs
@@ -15,7 +15,7 @@ mod tests;
 // See https://docs.microsoft.com/windows/win32/api/heapapi/
 
 // Flag to indicate that the memory returned by `HeapAlloc` should be zeroed.
-const HEAP_ZERO_MEMORY: c::DWORD = 0x00000008;
+const HEAP_ZERO_MEMORY: u32 = 0x00000008;
 
 // Get a handle to the default heap of the current process, or null if the operation fails.
 //
@@ -113,7 +113,7 @@ fn init_or_get_process_heap() -> c::HANDLE {
 #[cold]
 extern "C" fn process_heap_init_and_alloc(
     _heap: MaybeUninit<c::HANDLE>, // We pass this argument to match the ABI of `HeapAlloc`
-    flags: c::DWORD,
+    flags: u32,
     dwBytes: usize,
 ) -> *mut c_void {
     let heap = init_or_get_process_heap();
@@ -127,7 +127,7 @@ extern "C" fn process_heap_init_and_alloc(
 #[inline(never)]
 fn process_heap_alloc(
     _heap: MaybeUninit<c::HANDLE>, // We pass this argument to match the ABI of `HeapAlloc`,
-    flags: c::DWORD,
+    flags: u32,
     dwBytes: usize,
 ) -> *mut c_void {
     let heap = HEAP.load(Ordering::Relaxed);
diff --git a/library/std/src/sys/pal/windows/c.rs b/library/std/src/sys/pal/windows/c.rs
index 9f189452ecc..0197be5be3a 100644
--- a/library/std/src/sys/pal/windows/c.rs
+++ b/library/std/src/sys/pal/windows/c.rs
@@ -17,7 +17,6 @@ pub(super) mod windows_targets;
 mod windows_sys;
 pub use windows_sys::*;
 
-pub type DWORD = c_ulong;
 pub type WCHAR = u16;
 
 pub type socklen_t = c_int;
@@ -316,13 +315,13 @@ compat_fn_with_fallback! {
     // >= Win10 1607
     // https://docs.microsoft.com/en-us/windows/win32/api/processthreadsapi/nf-processthreadsapi-setthreaddescription
     pub fn SetThreadDescription(hthread: HANDLE, lpthreaddescription: PCWSTR) -> HRESULT {
-        SetLastError(ERROR_CALL_NOT_IMPLEMENTED as DWORD); E_NOTIMPL
+        SetLastError(ERROR_CALL_NOT_IMPLEMENTED as u32); E_NOTIMPL
     }
 
     // >= Win10 1607
     // https://docs.microsoft.com/en-us/windows/win32/api/processthreadsapi/nf-processthreadsapi-getthreaddescription
     pub fn GetThreadDescription(hthread: HANDLE, lpthreaddescription: *mut PWSTR) -> HRESULT {
-        SetLastError(ERROR_CALL_NOT_IMPLEMENTED as DWORD); E_NOTIMPL
+        SetLastError(ERROR_CALL_NOT_IMPLEMENTED as u32); E_NOTIMPL
     }
 
     // >= Win8 / Server 2012
@@ -383,9 +382,9 @@ compat_fn_with_fallback! {
     #[cfg(target_vendor = "win7")]
     pub fn NtCreateKeyedEvent(
         KeyedEventHandle: *mut HANDLE,
-        DesiredAccess: DWORD,
+        DesiredAccess: u32,
         ObjectAttributes: *mut c_void,
-        Flags: ULONG
+        Flags: u32
     ) -> NTSTATUS {
         panic!("keyed events not available")
     }
@@ -433,9 +432,9 @@ compat_fn_with_fallback! {
         apccontext: *mut c_void,
         iostatusblock: &mut IO_STATUS_BLOCK,
         buffer: *mut crate::mem::MaybeUninit<u8>,
-        length: ULONG,
+        length: u32,
         byteoffset: Option<&i64>,
-        key: Option<&ULONG>
+        key: Option<&u32>
     ) -> NTSTATUS {
         STATUS_NOT_IMPLEMENTED
     }
@@ -447,9 +446,9 @@ compat_fn_with_fallback! {
         apccontext: *mut c_void,
         iostatusblock: &mut IO_STATUS_BLOCK,
         buffer: *const u8,
-        length: ULONG,
+        length: u32,
         byteoffset: Option<&i64>,
-        key: Option<&ULONG>
+        key: Option<&u32>
     ) -> NTSTATUS {
         STATUS_NOT_IMPLEMENTED
     }
diff --git a/library/std/src/sys/pal/windows/fs.rs b/library/std/src/sys/pal/windows/fs.rs
index 2c4380e1446..f47e0a17334 100644
--- a/library/std/src/sys/pal/windows/fs.rs
+++ b/library/std/src/sys/pal/windows/fs.rs
@@ -28,12 +28,12 @@ pub struct File {
 
 #[derive(Clone)]
 pub struct FileAttr {
-    attributes: c::DWORD,
+    attributes: u32,
     creation_time: c::FILETIME,
     last_access_time: c::FILETIME,
     last_write_time: c::FILETIME,
     file_size: u64,
-    reparse_tag: c::DWORD,
+    reparse_tag: u32,
     volume_serial_number: Option<u32>,
     number_of_links: Option<u32>,
     file_index: Option<u64>,
@@ -41,8 +41,8 @@ pub struct FileAttr {
 
 #[derive(Copy, Clone, PartialEq, Eq, Hash, Debug)]
 pub struct FileType {
-    attributes: c::DWORD,
-    reparse_tag: c::DWORD,
+    attributes: u32,
+    reparse_tag: u32,
 }
 
 pub struct ReadDir {
@@ -75,16 +75,16 @@ pub struct OpenOptions {
     create_new: bool,
     // system-specific
     custom_flags: u32,
-    access_mode: Option<c::DWORD>,
-    attributes: c::DWORD,
-    share_mode: c::DWORD,
-    security_qos_flags: c::DWORD,
+    access_mode: Option<u32>,
+    attributes: u32,
+    share_mode: u32,
+    security_qos_flags: u32,
     security_attributes: *mut c::SECURITY_ATTRIBUTES,
 }
 
 #[derive(Clone, PartialEq, Eq, Debug)]
 pub struct FilePermissions {
-    attrs: c::DWORD,
+    attrs: u32,
 }
 
 #[derive(Copy, Clone, Debug, Default)]
@@ -245,7 +245,7 @@ impl OpenOptions {
         self.security_attributes = attrs;
     }
 
-    fn get_access_mode(&self) -> io::Result<c::DWORD> {
+    fn get_access_mode(&self) -> io::Result<u32> {
         match (self.read, self.write, self.append, self.access_mode) {
             (.., Some(mode)) => Ok(mode),
             (true, false, false, None) => Ok(c::GENERIC_READ),
@@ -261,7 +261,7 @@ impl OpenOptions {
         }
     }
 
-    fn get_creation_mode(&self) -> io::Result<c::DWORD> {
+    fn get_creation_mode(&self) -> io::Result<u32> {
         match (self.write, self.append) {
             (true, false) => {}
             (false, false) => {
@@ -287,7 +287,7 @@ impl OpenOptions {
         })
     }
 
-    fn get_flags_and_attributes(&self) -> c::DWORD {
+    fn get_flags_and_attributes(&self) -> u32 {
         self.custom_flags
             | self.attributes
             | self.security_qos_flags
@@ -397,21 +397,21 @@ impl File {
                 self.handle.as_raw_handle(),
                 c::FileBasicInfo,
                 core::ptr::addr_of_mut!(info) as *mut c_void,
-                size as c::DWORD,
+                size as u32,
             ))?;
             let mut attr = FileAttr {
                 attributes: info.FileAttributes,
                 creation_time: c::FILETIME {
-                    dwLowDateTime: info.CreationTime as c::DWORD,
-                    dwHighDateTime: (info.CreationTime >> 32) as c::DWORD,
+                    dwLowDateTime: info.CreationTime as u32,
+                    dwHighDateTime: (info.CreationTime >> 32) as u32,
                 },
                 last_access_time: c::FILETIME {
-                    dwLowDateTime: info.LastAccessTime as c::DWORD,
-                    dwHighDateTime: (info.LastAccessTime >> 32) as c::DWORD,
+                    dwLowDateTime: info.LastAccessTime as u32,
+                    dwHighDateTime: (info.LastAccessTime >> 32) as u32,
                 },
                 last_write_time: c::FILETIME {
-                    dwLowDateTime: info.LastWriteTime as c::DWORD,
-                    dwHighDateTime: (info.LastWriteTime >> 32) as c::DWORD,
+                    dwLowDateTime: info.LastWriteTime as u32,
+                    dwHighDateTime: (info.LastWriteTime >> 32) as u32,
                 },
                 file_size: 0,
                 reparse_tag: 0,
@@ -425,7 +425,7 @@ impl File {
                 self.handle.as_raw_handle(),
                 c::FileStandardInfo,
                 core::ptr::addr_of_mut!(info) as *mut c_void,
-                size as c::DWORD,
+                size as u32,
             ))?;
             attr.file_size = info.AllocationSize as u64;
             attr.number_of_links = Some(info.NumberOfLinks);
@@ -511,7 +511,7 @@ impl File {
     fn reparse_point(
         &self,
         space: &mut Align8<[MaybeUninit<u8>]>,
-    ) -> io::Result<(c::DWORD, *mut c::REPARSE_DATA_BUFFER)> {
+    ) -> io::Result<(u32, *mut c::REPARSE_DATA_BUFFER)> {
         unsafe {
             let mut bytes = 0;
             cvt({
@@ -524,7 +524,7 @@ impl File {
                     ptr::null_mut(),
                     0,
                     space.0.as_mut_ptr().cast(),
-                    len as c::DWORD,
+                    len as u32,
                     &mut bytes,
                     ptr::null_mut(),
                 )
@@ -609,8 +609,7 @@ impl File {
                 "Cannot set file timestamp to 0",
             ));
         }
-        let is_max =
-            |t: c::FILETIME| t.dwLowDateTime == c::DWORD::MAX && t.dwHighDateTime == c::DWORD::MAX;
+        let is_max = |t: c::FILETIME| t.dwLowDateTime == u32::MAX && t.dwHighDateTime == u32::MAX;
         if times.accessed.map_or(false, is_max)
             || times.modified.map_or(false, is_max)
             || times.created.map_or(false, is_max)
@@ -641,7 +640,7 @@ impl File {
                 self.handle.as_raw_handle(),
                 c::FileBasicInfo,
                 core::ptr::addr_of_mut!(info) as *mut c_void,
-                size as c::DWORD,
+                size as u32,
             ))?;
             Ok(info)
         }
@@ -1020,7 +1019,7 @@ impl FileTimes {
 }
 
 impl FileType {
-    fn new(attrs: c::DWORD, reparse_tag: c::DWORD) -> FileType {
+    fn new(attrs: u32, reparse_tag: u32) -> FileType {
         FileType { attributes: attrs, reparse_tag }
     }
     pub fn is_dir(&self) -> bool {
@@ -1421,12 +1420,12 @@ pub fn copy(from: &Path, to: &Path) -> io::Result<u64> {
         _TotalBytesTransferred: i64,
         _StreamSize: i64,
         StreamBytesTransferred: i64,
-        dwStreamNumber: c::DWORD,
-        _dwCallbackReason: c::DWORD,
+        dwStreamNumber: u32,
+        _dwCallbackReason: u32,
         _hSourceFile: c::HANDLE,
         _hDestinationFile: c::HANDLE,
         lpData: *const c_void,
-    ) -> c::DWORD {
+    ) -> u32 {
         if dwStreamNumber == 1 {
             *(lpData as *mut i64) = StreamBytesTransferred;
         }
diff --git a/library/std/src/sys/pal/windows/handle.rs b/library/std/src/sys/pal/windows/handle.rs
index 3f85bb0a099..575178c3826 100644
--- a/library/std/src/sys/pal/windows/handle.rs
+++ b/library/std/src/sys/pal/windows/handle.rs
@@ -141,7 +141,7 @@ impl Handle {
         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 len = cmp::min(buf.len(), u32::MAX as usize) as u32;
         let mut amt = 0;
         let res =
             cvt(c::ReadFile(self.as_raw_handle(), buf.as_mut_ptr(), len, &mut amt, overlapped));
@@ -209,12 +209,7 @@ impl Handle {
         Ok(Self(self.0.try_clone()?))
     }
 
-    pub fn duplicate(
-        &self,
-        access: c::DWORD,
-        inherit: bool,
-        options: c::DWORD,
-    ) -> io::Result<Self> {
+    pub fn duplicate(&self, access: u32, inherit: bool, options: u32) -> io::Result<Self> {
         Ok(Self(self.0.as_handle().duplicate(access, inherit, options)?))
     }
 
@@ -233,7 +228,7 @@ impl Handle {
         let mut io_status = c::IO_STATUS_BLOCK::PENDING;
 
         // The length is clamped at u32::MAX.
-        let len = cmp::min(len, c::DWORD::MAX as usize) as c::DWORD;
+        let len = cmp::min(len, u32::MAX as usize) as u32;
         let status = c::NtReadFile(
             self.as_handle(),
             ptr::null_mut(),
@@ -281,7 +276,7 @@ impl Handle {
         let mut io_status = c::IO_STATUS_BLOCK::PENDING;
 
         // The length is clamped at u32::MAX.
-        let len = cmp::min(buf.len(), c::DWORD::MAX as usize) as c::DWORD;
+        let len = cmp::min(buf.len(), u32::MAX as usize) as u32;
         let status = unsafe {
             c::NtWriteFile(
                 self.as_handle(),
diff --git a/library/std/src/sys/pal/windows/mod.rs b/library/std/src/sys/pal/windows/mod.rs
index 6406cec9c27..59dcbbc752f 100644
--- a/library/std/src/sys/pal/windows/mod.rs
+++ b/library/std/src/sys/pal/windows/mod.rs
@@ -75,7 +75,7 @@ pub fn is_interrupted(_errno: i32) -> bool {
 pub fn decode_error_kind(errno: i32) -> ErrorKind {
     use ErrorKind::*;
 
-    match errno as c::DWORD {
+    match errno as u32 {
         c::ERROR_ACCESS_DENIED => return PermissionDenied,
         c::ERROR_ALREADY_EXISTS => return AlreadyExists,
         c::ERROR_FILE_EXISTS => return AlreadyExists,
@@ -216,7 +216,7 @@ pub fn to_u16s<S: AsRef<OsStr>>(s: S) -> crate::io::Result<Vec<u16>> {
 // from this closure is then the return value of the function.
 pub fn fill_utf16_buf<F1, F2, T>(mut f1: F1, f2: F2) -> crate::io::Result<T>
 where
-    F1: FnMut(*mut u16, c::DWORD) -> c::DWORD,
+    F1: FnMut(*mut u16, u32) -> u32,
     F2: FnOnce(&[u16]) -> T,
 {
     // Start off with a stack buf but then spill over to the heap if we end up
@@ -238,7 +238,7 @@ where
                 // We used `reserve` and not `reserve_exact`, so in theory we
                 // may have gotten more than requested. If so, we'd like to use
                 // it... so long as we won't cause overflow.
-                n = heap_buf.capacity().min(c::DWORD::MAX as usize);
+                n = heap_buf.capacity().min(u32::MAX as usize);
                 // Safety: MaybeUninit<u16> does not need initialization
                 heap_buf.set_len(n);
                 &mut heap_buf[..]
@@ -254,13 +254,13 @@ where
             // error" is still 0 then we interpret it as a 0 length buffer and
             // not an actual error.
             c::SetLastError(0);
-            let k = match f1(buf.as_mut_ptr().cast::<u16>(), n as c::DWORD) {
+            let k = match f1(buf.as_mut_ptr().cast::<u16>(), n as u32) {
                 0 if api::get_last_error().code == 0 => 0,
                 0 => return Err(crate::io::Error::last_os_error()),
                 n => n,
             } as usize;
             if k == n && api::get_last_error().code == c::ERROR_INSUFFICIENT_BUFFER {
-                n = n.saturating_mul(2).min(c::DWORD::MAX as usize);
+                n = n.saturating_mul(2).min(u32::MAX as usize);
             } else if k > n {
                 n = k;
             } else if k == n {
@@ -308,7 +308,7 @@ pub fn cvt<I: IsZero>(i: I) -> crate::io::Result<I> {
     if i.is_zero() { Err(crate::io::Error::last_os_error()) } else { Ok(i) }
 }
 
-pub fn dur2timeout(dur: Duration) -> c::DWORD {
+pub fn dur2timeout(dur: Duration) -> u32 {
     // Note that a duration is a (u64, u32) (seconds, nanoseconds) pair, and the
     // timeouts in windows APIs are typically u32 milliseconds. To translate, we
     // have two pieces to take care of:
@@ -320,7 +320,7 @@ pub fn dur2timeout(dur: Duration) -> c::DWORD {
         .checked_mul(1000)
         .and_then(|ms| ms.checked_add((dur.subsec_nanos() as u64) / 1_000_000))
         .and_then(|ms| ms.checked_add(if dur.subsec_nanos() % 1_000_000 > 0 { 1 } else { 0 }))
-        .map(|ms| if ms > <c::DWORD>::MAX as u64 { c::INFINITE } else { ms as c::DWORD })
+        .map(|ms| if ms > <u32>::MAX as u64 { c::INFINITE } else { ms as u32 })
         .unwrap_or(c::INFINITE)
 }
 
diff --git a/library/std/src/sys/pal/windows/net.rs b/library/std/src/sys/pal/windows/net.rs
index 9e15b15a351..bff789a8030 100644
--- a/library/std/src/sys/pal/windows/net.rs
+++ b/library/std/src/sys/pal/windows/net.rs
@@ -250,7 +250,7 @@ impl Socket {
     pub fn read_vectored(&self, bufs: &mut [IoSliceMut<'_>]) -> io::Result<usize> {
         // On unix when a socket is shut down all further reads return 0, so we
         // do the same on windows to map a shut down socket to returning EOF.
-        let length = cmp::min(bufs.len(), c::DWORD::MAX as usize) as c::DWORD;
+        let length = cmp::min(bufs.len(), u32::MAX as usize) as u32;
         let mut nread = 0;
         let mut flags = 0;
         let result = unsafe {
@@ -335,7 +335,7 @@ impl Socket {
     }
 
     pub fn write_vectored(&self, bufs: &[IoSlice<'_>]) -> io::Result<usize> {
-        let length = cmp::min(bufs.len(), c::DWORD::MAX as usize) as c::DWORD;
+        let length = cmp::min(bufs.len(), u32::MAX as usize) as u32;
         let mut nwritten = 0;
         let result = unsafe {
             c::WSASend(
@@ -371,7 +371,7 @@ impl Socket {
     }
 
     pub fn timeout(&self, kind: c_int) -> io::Result<Option<Duration>> {
-        let raw: c::DWORD = net::getsockopt(self, c::SOL_SOCKET, kind)?;
+        let raw: u32 = net::getsockopt(self, c::SOL_SOCKET, kind)?;
         if raw == 0 {
             Ok(None)
         } else {
diff --git a/library/std/src/sys/pal/windows/os.rs b/library/std/src/sys/pal/windows/os.rs
index ed7911b99cb..88a4a46726c 100644
--- a/library/std/src/sys/pal/windows/os.rs
+++ b/library/std/src/sys/pal/windows/os.rs
@@ -52,10 +52,10 @@ pub fn error_string(mut errnum: i32) -> String {
         let res = c::FormatMessageW(
             flags | c::FORMAT_MESSAGE_FROM_SYSTEM | c::FORMAT_MESSAGE_IGNORE_INSERTS,
             module,
-            errnum as c::DWORD,
+            errnum as u32,
             0,
             buf.as_mut_ptr(),
-            buf.len() as c::DWORD,
+            buf.len() as u32,
             ptr::null(),
         ) as usize;
         if res == 0 {
diff --git a/library/std/src/sys/pal/windows/pipe.rs b/library/std/src/sys/pal/windows/pipe.rs
index 03166033548..da76e0c5275 100644
--- a/library/std/src/sys/pal/windows/pipe.rs
+++ b/library/std/src/sys/pal/windows/pipe.rs
@@ -156,7 +156,7 @@ pub fn anon_pipe(ours_readable: bool, their_handle_inheritable: bool) -> io::Res
         opts.share_mode(0);
         let size = mem::size_of::<c::SECURITY_ATTRIBUTES>();
         let mut sa = c::SECURITY_ATTRIBUTES {
-            nLength: size as c::DWORD,
+            nLength: size as u32,
             lpSecurityDescriptor: ptr::null_mut(),
             bInheritHandle: their_handle_inheritable as i32,
         };
@@ -226,7 +226,7 @@ fn random_number() -> usize {
 type AlertableIoFn = unsafe extern "system" fn(
     BorrowedHandle<'_>,
     *mut core::ffi::c_void,
-    c::DWORD,
+    u32,
     *mut c::OVERLAPPED,
     c::LPOVERLAPPED_COMPLETION_ROUTINE,
 ) -> c::BOOL;
@@ -244,7 +244,7 @@ impl AnonPipe {
 
     pub fn read(&self, buf: &mut [u8]) -> io::Result<usize> {
         let result = unsafe {
-            let len = crate::cmp::min(buf.len(), c::DWORD::MAX as usize) as c::DWORD;
+            let len = crate::cmp::min(buf.len(), u32::MAX as usize) as u32;
             self.alertable_io_internal(c::ReadFileEx, buf.as_mut_ptr() as _, len)
         };
 
@@ -260,7 +260,7 @@ impl AnonPipe {
 
     pub fn read_buf(&self, mut buf: BorrowedCursor<'_>) -> io::Result<()> {
         let result = unsafe {
-            let len = crate::cmp::min(buf.capacity(), c::DWORD::MAX as usize) as c::DWORD;
+            let len = crate::cmp::min(buf.capacity(), u32::MAX as usize) as u32;
             self.alertable_io_internal(c::ReadFileEx, buf.as_mut().as_mut_ptr() as _, len)
         };
 
@@ -295,7 +295,7 @@ impl AnonPipe {
 
     pub fn write(&self, buf: &[u8]) -> io::Result<usize> {
         unsafe {
-            let len = crate::cmp::min(buf.len(), c::DWORD::MAX as usize) as c::DWORD;
+            let len = crate::cmp::min(buf.len(), u32::MAX as usize) as u32;
             self.alertable_io_internal(c::WriteFileEx, buf.as_ptr() as _, len)
         }
     }
@@ -328,7 +328,7 @@ impl AnonPipe {
         &self,
         io: AlertableIoFn,
         buf: *mut core::ffi::c_void,
-        len: c::DWORD,
+        len: u32,
     ) -> io::Result<usize> {
         // Use "alertable I/O" to synchronize the pipe I/O.
         // This has four steps.
diff --git a/library/std/src/sys/pal/windows/process.rs b/library/std/src/sys/pal/windows/process.rs
index 4b4856d870d..76d2cb77d47 100644
--- a/library/std/src/sys/pal/windows/process.rs
+++ b/library/std/src/sys/pal/windows/process.rs
@@ -174,7 +174,7 @@ pub struct Command {
 
 pub enum Stdio {
     Inherit,
-    InheritSpecific { from_stdio_id: c::DWORD },
+    InheritSpecific { from_stdio_id: u32 },
     Null,
     MakePipe,
     Pipe(AnonPipe),
@@ -364,7 +364,7 @@ impl Command {
             };
             si_ptr = core::ptr::addr_of_mut!(si_ex) as _;
         } else {
-            si.cb = mem::size_of::<c::STARTUPINFOW>() as c::DWORD;
+            si.cb = mem::size_of::<c::STARTUPINFOW>() as u32;
             si_ptr = core::ptr::addr_of_mut!(si) as _;
         }
 
@@ -566,7 +566,7 @@ fn program_exists(path: &Path) -> Option<Vec<u16>> {
 }
 
 impl Stdio {
-    fn to_handle(&self, stdio_id: c::DWORD, pipe: &mut Option<AnonPipe>) -> io::Result<Handle> {
+    fn to_handle(&self, stdio_id: u32, pipe: &mut Option<AnonPipe>) -> io::Result<Handle> {
         let use_stdio_id = |stdio_id| match stdio::get_handle(stdio_id) {
             Ok(io) => unsafe {
                 let io = Handle::from_raw_handle(io);
@@ -601,7 +601,7 @@ impl Stdio {
             Stdio::Null => {
                 let size = mem::size_of::<c::SECURITY_ATTRIBUTES>();
                 let mut sa = c::SECURITY_ATTRIBUTES {
-                    nLength: size as c::DWORD,
+                    nLength: size as u32,
                     lpSecurityDescriptor: ptr::null_mut(),
                     bInheritHandle: 1,
                 };
@@ -713,7 +713,7 @@ impl Process {
 }
 
 #[derive(PartialEq, Eq, Clone, Copy, Debug, Default)]
-pub struct ExitStatus(c::DWORD);
+pub struct ExitStatus(u32);
 
 impl ExitStatus {
     pub fn exit_ok(&self) -> Result<(), ExitStatusError> {
@@ -727,9 +727,9 @@ impl ExitStatus {
     }
 }
 
-/// Converts a raw `c::DWORD` to a type-safe `ExitStatus` by wrapping it without copying.
-impl From<c::DWORD> for ExitStatus {
-    fn from(u: c::DWORD) -> ExitStatus {
+/// Converts a raw `u32` to a type-safe `ExitStatus` by wrapping it without copying.
+impl From<u32> for ExitStatus {
+    fn from(u: u32) -> ExitStatus {
         ExitStatus(u)
     }
 }
@@ -765,7 +765,7 @@ impl ExitStatusError {
 }
 
 #[derive(PartialEq, Eq, Clone, Copy, Debug)]
-pub struct ExitCode(c::DWORD);
+pub struct ExitCode(u32);
 
 impl ExitCode {
     pub const SUCCESS: ExitCode = ExitCode(EXIT_SUCCESS as _);
@@ -779,13 +779,13 @@ impl ExitCode {
 
 impl From<u8> for ExitCode {
     fn from(code: u8) -> Self {
-        ExitCode(c::DWORD::from(code))
+        ExitCode(u32::from(code))
     }
 }
 
 impl From<u32> for ExitCode {
     fn from(code: u32) -> Self {
-        ExitCode(c::DWORD::from(code))
+        ExitCode(u32::from(code))
     }
 }
 
diff --git a/library/std/src/sys/pal/windows/stdio.rs b/library/std/src/sys/pal/windows/stdio.rs
index 831efb252c4..44385fecf6e 100644
--- a/library/std/src/sys/pal/windows/stdio.rs
+++ b/library/std/src/sys/pal/windows/stdio.rs
@@ -68,7 +68,7 @@ const MAX_BUFFER_SIZE: usize = 8192;
 // UTF-16 to UTF-8.
 pub const STDIN_BUF_SIZE: usize = MAX_BUFFER_SIZE / 2 * 3;
 
-pub fn get_handle(handle_id: c::DWORD) -> io::Result<c::HANDLE> {
+pub fn get_handle(handle_id: u32) -> io::Result<c::HANDLE> {
     let handle = unsafe { c::GetStdHandle(handle_id) };
     if handle == c::INVALID_HANDLE_VALUE {
         Err(io::Error::last_os_error())
@@ -87,11 +87,7 @@ fn is_console(handle: c::HANDLE) -> bool {
     unsafe { c::GetConsoleMode(handle, &mut mode) != 0 }
 }
 
-fn write(
-    handle_id: c::DWORD,
-    data: &[u8],
-    incomplete_utf8: &mut IncompleteUtf8,
-) -> io::Result<usize> {
+fn write(handle_id: u32, data: &[u8], incomplete_utf8: &mut IncompleteUtf8) -> io::Result<usize> {
     if data.is_empty() {
         return Ok(0);
     }
diff --git a/library/std/src/sys/pal/windows/thread.rs b/library/std/src/sys/pal/windows/thread.rs
index 70099e0a3b5..84f6f28dbe2 100644
--- a/library/std/src/sys/pal/windows/thread.rs
+++ b/library/std/src/sys/pal/windows/thread.rs
@@ -45,7 +45,7 @@ impl Thread {
             Err(io::Error::last_os_error())
         };
 
-        unsafe extern "system" fn thread_start(main: *mut c_void) -> c::DWORD {
+        unsafe extern "system" fn thread_start(main: *mut c_void) -> u32 {
             // Next, reserve some stack space for if we otherwise run out of stack.
             stack_overflow::reserve_stack();
             // Finally, let's run some code.
diff --git a/library/std/src/sys/pal/windows/time.rs b/library/std/src/sys/pal/windows/time.rs
index bf299a9b7d2..b853daeffeb 100644
--- a/library/std/src/sys/pal/windows/time.rs
+++ b/library/std/src/sys/pal/windows/time.rs
@@ -76,8 +76,8 @@ impl SystemTime {
     fn from_intervals(intervals: i64) -> SystemTime {
         SystemTime {
             t: c::FILETIME {
-                dwLowDateTime: intervals as c::DWORD,
-                dwHighDateTime: (intervals >> 32) as c::DWORD,
+                dwLowDateTime: intervals as u32,
+                dwHighDateTime: (intervals >> 32) as u32,
             },
         }
     }
diff --git a/library/std/src/sys/thread_local/guard/windows.rs b/library/std/src/sys/thread_local/guard/windows.rs
index c35b717fe75..f6cd457046f 100644
--- a/library/std/src/sys/thread_local/guard/windows.rs
+++ b/library/std/src/sys/thread_local/guard/windows.rs
@@ -75,9 +75,9 @@ pub fn enable() {
 
 #[link_section = ".CRT$XLB"]
 #[cfg_attr(miri, used)] // Miri only considers explicitly `#[used]` statics for `lookup_link_section`
-pub static CALLBACK: unsafe extern "system" fn(*mut c_void, c::DWORD, *mut c_void) = tls_callback;
+pub static CALLBACK: unsafe extern "system" fn(*mut c_void, u32, *mut c_void) = tls_callback;
 
-unsafe extern "system" fn tls_callback(_h: *mut c_void, dw_reason: c::DWORD, _pv: *mut c_void) {
+unsafe extern "system" fn tls_callback(_h: *mut c_void, dw_reason: u32, _pv: *mut c_void) {
     // See comments above for what this is doing. Note that we don't need this
     // trickery on GNU windows, just on MSVC.
     #[cfg(all(target_env = "msvc", not(target_thread_local)))]
diff --git a/library/std/src/sys/thread_local/key/windows.rs b/library/std/src/sys/thread_local/key/windows.rs
index baf23979c7c..8b43e558d5d 100644
--- a/library/std/src/sys/thread_local/key/windows.rs
+++ b/library/std/src/sys/thread_local/key/windows.rs
@@ -33,11 +33,11 @@ use crate::sync::atomic::{
 use crate::sys::c;
 use crate::sys::thread_local::guard;
 
-pub type Key = c::DWORD;
+pub type Key = u32;
 type Dtor = unsafe extern "C" fn(*mut u8);
 
 pub struct LazyKey {
-    /// The key value shifted up by one. Since TLS_OUT_OF_INDEXES == DWORD::MAX
+    /// The key value shifted up by one. Since TLS_OUT_OF_INDEXES == u32::MAX
     /// is not a valid key value, this allows us to use zero as sentinel value
     /// without risking overflow.
     key: AtomicU32,