1 // Copyright 2014 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
12 use os::windows::prelude::*;
16 use io::{self, Error, SeekFrom};
18 use path::{Path, PathBuf};
22 use sys::handle::Handle;
24 use sys_common::FromInner;
28 pub struct File { handle: Handle }
32 data: c::WIN32_FILE_ATTRIBUTE_DATA,
33 reparse_tag: c::DWORD,
36 #[derive(Copy, Clone, PartialEq, Eq, Hash)]
38 Dir, File, Symlink, ReparsePoint, MountPoint,
42 handle: FindNextFileHandle,
44 first: Option<c::WIN32_FIND_DATAW>,
47 struct FindNextFileHandle(c::HANDLE);
49 unsafe impl Send for FindNextFileHandle {}
50 unsafe impl Sync for FindNextFileHandle {}
54 data: c::WIN32_FIND_DATAW,
58 pub struct OpenOptions {
68 access_mode: Option<c::DWORD>,
71 security_qos_flags: c::DWORD,
72 security_attributes: usize, // FIXME: should be a reference
75 #[derive(Clone, PartialEq, Eq, Debug)]
76 pub struct FilePermissions { attrs: c::DWORD }
78 pub struct DirBuilder;
80 impl Iterator for ReadDir {
81 type Item = io::Result<DirEntry>;
82 fn next(&mut self) -> Option<io::Result<DirEntry>> {
83 if let Some(first) = self.first.take() {
84 if let Some(e) = DirEntry::new(&self.root, &first) {
89 let mut wfd = mem::zeroed();
91 if c::FindNextFileW(self.handle.0, &mut wfd) == 0 {
92 if c::GetLastError() == c::ERROR_NO_MORE_FILES {
95 return Some(Err(Error::last_os_error()))
98 if let Some(e) = DirEntry::new(&self.root, &wfd) {
106 impl Drop for FindNextFileHandle {
108 let r = unsafe { c::FindClose(self.0) };
109 debug_assert!(r != 0);
114 fn new(root: &Arc<PathBuf>, wfd: &c::WIN32_FIND_DATAW) -> Option<DirEntry> {
115 match &wfd.cFileName[0..3] {
116 // check for '.' and '..'
118 [46, 46, 0, ..] => return None,
128 pub fn path(&self) -> PathBuf {
129 self.root.join(&self.file_name())
132 pub fn file_name(&self) -> OsString {
133 let filename = super::truncate_utf16_at_nul(&self.data.cFileName);
134 OsString::from_wide(filename)
137 pub fn file_type(&self) -> io::Result<FileType> {
138 Ok(FileType::new(self.data.dwFileAttributes,
139 /* reparse_tag = */ self.data.dwReserved0))
142 pub fn metadata(&self) -> io::Result<FileAttr> {
144 data: c::WIN32_FILE_ATTRIBUTE_DATA {
145 dwFileAttributes: self.data.dwFileAttributes,
146 ftCreationTime: self.data.ftCreationTime,
147 ftLastAccessTime: self.data.ftLastAccessTime,
148 ftLastWriteTime: self.data.ftLastWriteTime,
149 nFileSizeHigh: self.data.nFileSizeHigh,
150 nFileSizeLow: self.data.nFileSizeLow,
152 reparse_tag: self.data.dwReserved0,
158 pub fn new() -> OpenOptions {
170 share_mode: c::FILE_SHARE_READ | c::FILE_SHARE_WRITE | c::FILE_SHARE_DELETE,
172 security_qos_flags: 0,
173 security_attributes: 0,
177 pub fn read(&mut self, read: bool) { self.read = read; }
178 pub fn write(&mut self, write: bool) { self.write = write; }
179 pub fn append(&mut self, append: bool) { self.append = append; }
180 pub fn truncate(&mut self, truncate: bool) { self.truncate = truncate; }
181 pub fn create(&mut self, create: bool) { self.create = create; }
182 pub fn create_new(&mut self, create_new: bool) { self.create_new = create_new; }
184 pub fn custom_flags(&mut self, flags: u32) { self.custom_flags = flags; }
185 pub fn access_mode(&mut self, access_mode: u32) { self.access_mode = Some(access_mode); }
186 pub fn share_mode(&mut self, share_mode: u32) { self.share_mode = share_mode; }
187 pub fn attributes(&mut self, attrs: u32) { self.attributes = attrs; }
188 pub fn security_qos_flags(&mut self, flags: u32) { self.security_qos_flags = flags; }
189 pub fn security_attributes(&mut self, attrs: c::LPSECURITY_ATTRIBUTES) {
190 self.security_attributes = attrs as usize;
193 fn get_access_mode(&self) -> io::Result<c::DWORD> {
194 const ERROR_INVALID_PARAMETER: i32 = 87;
196 match (self.read, self.write, self.append, self.access_mode) {
197 (_, _, _, Some(mode)) => Ok(mode),
198 (true, false, false, None) => Ok(c::GENERIC_READ),
199 (false, true, false, None) => Ok(c::GENERIC_WRITE),
200 (true, true, false, None) => Ok(c::GENERIC_READ | c::GENERIC_WRITE),
201 (false, _, true, None) => Ok(c::FILE_GENERIC_WRITE & !c::FILE_WRITE_DATA),
202 (true, _, true, None) => Ok(c::GENERIC_READ |
203 (c::FILE_GENERIC_WRITE & !c::FILE_WRITE_DATA)),
204 (false, false, false, None) => Err(Error::from_raw_os_error(ERROR_INVALID_PARAMETER)),
208 fn get_creation_mode(&self) -> io::Result<c::DWORD> {
209 const ERROR_INVALID_PARAMETER: i32 = 87;
211 match (self.write, self.append) {
214 if self.truncate || self.create || self.create_new {
215 return Err(Error::from_raw_os_error(ERROR_INVALID_PARAMETER));
218 if self.truncate && !self.create_new {
219 return Err(Error::from_raw_os_error(ERROR_INVALID_PARAMETER));
223 Ok(match (self.create, self.truncate, self.create_new) {
224 (false, false, false) => c::OPEN_EXISTING,
225 (true, false, false) => c::OPEN_ALWAYS,
226 (false, true, false) => c::TRUNCATE_EXISTING,
227 (true, true, false) => c::CREATE_ALWAYS,
228 (_, _, true) => c::CREATE_NEW,
232 fn get_flags_and_attributes(&self) -> c::DWORD {
235 self.security_qos_flags |
236 if self.security_qos_flags != 0 { c::SECURITY_SQOS_PRESENT } else { 0 } |
237 if self.create_new { c::FILE_FLAG_OPEN_REPARSE_POINT } else { 0 }
242 fn open_reparse_point(path: &Path, write: bool) -> io::Result<File> {
243 let mut opts = OpenOptions::new();
246 opts.custom_flags(c::FILE_FLAG_OPEN_REPARSE_POINT |
247 c::FILE_FLAG_BACKUP_SEMANTICS);
248 File::open(path, &opts)
251 pub fn open(path: &Path, opts: &OpenOptions) -> io::Result<File> {
252 let path = try!(to_u16s(path));
253 let handle = unsafe {
254 c::CreateFileW(path.as_ptr(),
255 try!(opts.get_access_mode()),
257 opts.security_attributes as *mut _,
258 try!(opts.get_creation_mode()),
259 opts.get_flags_and_attributes(),
262 if handle == c::INVALID_HANDLE_VALUE {
263 Err(Error::last_os_error())
265 Ok(File { handle: Handle::new(handle) })
269 pub fn fsync(&self) -> io::Result<()> {
270 try!(cvt(unsafe { c::FlushFileBuffers(self.handle.raw()) }));
274 pub fn datasync(&self) -> io::Result<()> { self.fsync() }
276 pub fn truncate(&self, size: u64) -> io::Result<()> {
277 let mut info = c::FILE_END_OF_FILE_INFO {
278 EndOfFile: size as c::LARGE_INTEGER,
280 let size = mem::size_of_val(&info);
282 c::SetFileInformationByHandle(self.handle.raw(),
283 c::FileEndOfFileInfo,
284 &mut info as *mut _ as *mut _,
290 pub fn file_attr(&self) -> io::Result<FileAttr> {
292 let mut info: c::BY_HANDLE_FILE_INFORMATION = mem::zeroed();
293 try!(cvt(c::GetFileInformationByHandle(self.handle.raw(),
295 let mut attr = FileAttr {
296 data: c::WIN32_FILE_ATTRIBUTE_DATA {
297 dwFileAttributes: info.dwFileAttributes,
298 ftCreationTime: info.ftCreationTime,
299 ftLastAccessTime: info.ftLastAccessTime,
300 ftLastWriteTime: info.ftLastWriteTime,
301 nFileSizeHigh: info.nFileSizeHigh,
302 nFileSizeLow: info.nFileSizeLow,
306 if attr.is_reparse_point() {
307 let mut b = [0; c::MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
308 if let Ok((_, buf)) = self.reparse_point(&mut b) {
309 attr.reparse_tag = buf.ReparseTag;
316 pub fn read(&self, buf: &mut [u8]) -> io::Result<usize> {
317 self.handle.read(buf)
320 pub fn write(&self, buf: &[u8]) -> io::Result<usize> {
321 self.handle.write(buf)
324 pub fn flush(&self) -> io::Result<()> { Ok(()) }
326 pub fn seek(&self, pos: SeekFrom) -> io::Result<u64> {
327 let (whence, pos) = match pos {
328 SeekFrom::Start(n) => (c::FILE_BEGIN, n as i64),
329 SeekFrom::End(n) => (c::FILE_END, n),
330 SeekFrom::Current(n) => (c::FILE_CURRENT, n),
332 let pos = pos as c::LARGE_INTEGER;
335 c::SetFilePointerEx(self.handle.raw(), pos,
341 pub fn duplicate(&self) -> io::Result<File> {
343 handle: try!(self.handle.duplicate(0, true, c::DUPLICATE_SAME_ACCESS)),
347 pub fn handle(&self) -> &Handle { &self.handle }
349 pub fn into_handle(self) -> Handle { self.handle }
351 fn reparse_point<'a>(&self,
352 space: &'a mut [u8; c::MAXIMUM_REPARSE_DATA_BUFFER_SIZE])
353 -> io::Result<(c::DWORD, &'a c::REPARSE_DATA_BUFFER)> {
357 c::DeviceIoControl(self.handle.raw(),
358 c::FSCTL_GET_REPARSE_POINT,
361 space.as_mut_ptr() as *mut _,
362 space.len() as c::DWORD,
366 Ok((bytes, &*(space.as_ptr() as *const c::REPARSE_DATA_BUFFER)))
370 fn readlink(&self) -> io::Result<PathBuf> {
371 let mut space = [0u8; c::MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
372 let (_bytes, buf) = try!(self.reparse_point(&mut space));
373 if buf.ReparseTag != c::IO_REPARSE_TAG_SYMLINK {
374 return Err(io::Error::new(io::ErrorKind::Other, "not a symlink"))
378 let info: *const c::SYMBOLIC_LINK_REPARSE_BUFFER =
379 &buf.rest as *const _ as *const _;
380 let path_buffer = &(*info).PathBuffer as *const _ as *const u16;
381 let subst_off = (*info).SubstituteNameOffset / 2;
382 let subst_ptr = path_buffer.offset(subst_off as isize);
383 let subst_len = (*info).SubstituteNameLength / 2;
384 let subst = slice::from_raw_parts(subst_ptr, subst_len as usize);
386 Ok(PathBuf::from(OsString::from_wide(subst)))
391 impl FromInner<c::HANDLE> for File {
392 fn from_inner(handle: c::HANDLE) -> File {
393 File { handle: Handle::new(handle) }
397 impl fmt::Debug for File {
398 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
399 // FIXME(#24570): add more info here (e.g. mode)
400 let mut b = f.debug_struct("File");
401 b.field("handle", &self.handle.raw());
402 if let Ok(path) = get_path(&self) {
403 b.field("path", &path);
410 pub fn size(&self) -> u64 {
411 ((self.data.nFileSizeHigh as u64) << 32) | (self.data.nFileSizeLow as u64)
414 pub fn perm(&self) -> FilePermissions {
415 FilePermissions { attrs: self.data.dwFileAttributes }
418 pub fn attrs(&self) -> u32 { self.data.dwFileAttributes as u32 }
420 pub fn file_type(&self) -> FileType {
421 FileType::new(self.data.dwFileAttributes, self.reparse_tag)
424 pub fn created(&self) -> u64 { self.to_u64(&self.data.ftCreationTime) }
425 pub fn accessed(&self) -> u64 { self.to_u64(&self.data.ftLastAccessTime) }
426 pub fn modified(&self) -> u64 { self.to_u64(&self.data.ftLastWriteTime) }
428 fn to_u64(&self, ft: &c::FILETIME) -> u64 {
429 (ft.dwLowDateTime as u64) | ((ft.dwHighDateTime as u64) << 32)
432 fn is_reparse_point(&self) -> bool {
433 self.data.dwFileAttributes & c::FILE_ATTRIBUTE_REPARSE_POINT != 0
437 impl FilePermissions {
438 pub fn readonly(&self) -> bool {
439 self.attrs & c::FILE_ATTRIBUTE_READONLY != 0
442 pub fn set_readonly(&mut self, readonly: bool) {
444 self.attrs |= c::FILE_ATTRIBUTE_READONLY;
446 self.attrs &= !c::FILE_ATTRIBUTE_READONLY;
452 fn new(attrs: c::DWORD, reparse_tag: c::DWORD) -> FileType {
453 if attrs & c::FILE_ATTRIBUTE_REPARSE_POINT != 0 {
455 c::IO_REPARSE_TAG_SYMLINK => FileType::Symlink,
456 c::IO_REPARSE_TAG_MOUNT_POINT => FileType::MountPoint,
457 _ => FileType::ReparsePoint,
459 } else if attrs & c::FILE_ATTRIBUTE_DIRECTORY != 0 {
466 pub fn is_dir(&self) -> bool { *self == FileType::Dir }
467 pub fn is_file(&self) -> bool { *self == FileType::File }
468 pub fn is_symlink(&self) -> bool {
469 *self == FileType::Symlink || *self == FileType::MountPoint
474 pub fn new() -> DirBuilder { DirBuilder }
476 pub fn mkdir(&self, p: &Path) -> io::Result<()> {
477 let p = try!(to_u16s(p));
479 c::CreateDirectoryW(p.as_ptr(), ptr::null_mut())
485 pub fn readdir(p: &Path) -> io::Result<ReadDir> {
486 let root = p.to_path_buf();
487 let star = p.join("*");
488 let path = try!(to_u16s(&star));
491 let mut wfd = mem::zeroed();
492 let find_handle = c::FindFirstFileW(path.as_ptr(), &mut wfd);
493 if find_handle != c::INVALID_HANDLE_VALUE {
495 handle: FindNextFileHandle(find_handle),
496 root: Arc::new(root),
500 Err(Error::last_os_error())
505 pub fn unlink(p: &Path) -> io::Result<()> {
506 let p_u16s = try!(to_u16s(p));
507 try!(cvt(unsafe { c::DeleteFileW(p_u16s.as_ptr()) }));
511 pub fn rename(old: &Path, new: &Path) -> io::Result<()> {
512 let old = try!(to_u16s(old));
513 let new = try!(to_u16s(new));
515 c::MoveFileExW(old.as_ptr(), new.as_ptr(), c::MOVEFILE_REPLACE_EXISTING)
520 pub fn rmdir(p: &Path) -> io::Result<()> {
521 let p = try!(to_u16s(p));
522 try!(cvt(unsafe { c::RemoveDirectoryW(p.as_ptr()) }));
526 pub fn readlink(p: &Path) -> io::Result<PathBuf> {
527 let file = try!(File::open_reparse_point(p, false));
531 pub fn symlink(src: &Path, dst: &Path) -> io::Result<()> {
532 symlink_inner(src, dst, false)
535 pub fn symlink_inner(src: &Path, dst: &Path, dir: bool) -> io::Result<()> {
536 let src = try!(to_u16s(src));
537 let dst = try!(to_u16s(dst));
538 let flags = if dir { c::SYMBOLIC_LINK_FLAG_DIRECTORY } else { 0 };
540 c::CreateSymbolicLinkW(dst.as_ptr(), src.as_ptr(), flags) as c::BOOL
545 pub fn link(src: &Path, dst: &Path) -> io::Result<()> {
546 let src = try!(to_u16s(src));
547 let dst = try!(to_u16s(dst));
549 c::CreateHardLinkW(dst.as_ptr(), src.as_ptr(), ptr::null_mut())
554 pub fn stat(p: &Path) -> io::Result<FileAttr> {
555 let attr = try!(lstat(p));
557 // If this is a reparse point, then we need to reopen the file to get the
558 // actual destination. We also pass the FILE_FLAG_BACKUP_SEMANTICS flag to
559 // ensure that we can open directories (this path may be a directory
560 // junction). Once the file is opened we ask the opened handle what its
561 // metadata information is.
562 if attr.is_reparse_point() {
563 let mut opts = OpenOptions::new();
564 // No read or write permissions are necessary
566 // This flag is so we can open directories too
567 opts.custom_flags(c::FILE_FLAG_BACKUP_SEMANTICS);
568 let file = try!(File::open(p, &opts));
575 pub fn lstat(p: &Path) -> io::Result<FileAttr> {
576 let u16s = try!(to_u16s(p));
578 let mut attr: FileAttr = mem::zeroed();
579 try!(cvt(c::GetFileAttributesExW(u16s.as_ptr(),
580 c::GetFileExInfoStandard,
581 &mut attr.data as *mut _ as *mut _)));
582 if attr.is_reparse_point() {
583 attr.reparse_tag = File::open_reparse_point(p, false).and_then(|f| {
584 let mut b = [0; c::MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
585 f.reparse_point(&mut b).map(|(_, b)| b.ReparseTag)
592 pub fn set_perm(p: &Path, perm: FilePermissions) -> io::Result<()> {
593 let p = try!(to_u16s(p));
595 try!(cvt(c::SetFileAttributesW(p.as_ptr(), perm.attrs)));
600 fn get_path(f: &File) -> io::Result<PathBuf> {
601 super::fill_utf16_buf(|buf, sz| unsafe {
602 c::GetFinalPathNameByHandleW(f.handle.raw(), buf, sz,
605 PathBuf::from(OsString::from_wide(buf))
609 pub fn canonicalize(p: &Path) -> io::Result<PathBuf> {
610 let mut opts = OpenOptions::new();
611 // No read or write permissions are necessary
613 // This flag is so we can open directories too
614 opts.custom_flags(c::FILE_FLAG_BACKUP_SEMANTICS);
615 let f = try!(File::open(p, &opts));
619 pub fn copy(from: &Path, to: &Path) -> io::Result<u64> {
620 unsafe extern "system" fn callback(
621 _TotalFileSize: c::LARGE_INTEGER,
622 TotalBytesTransferred: c::LARGE_INTEGER,
623 _StreamSize: c::LARGE_INTEGER,
624 _StreamBytesTransferred: c::LARGE_INTEGER,
625 _dwStreamNumber: c::DWORD,
626 _dwCallbackReason: c::DWORD,
627 _hSourceFile: c::HANDLE,
628 _hDestinationFile: c::HANDLE,
631 *(lpData as *mut i64) = TotalBytesTransferred;
634 let pfrom = try!(to_u16s(from));
635 let pto = try!(to_u16s(to));
638 c::CopyFileExW(pfrom.as_ptr(), pto.as_ptr(), Some(callback),
639 &mut size as *mut _ as *mut _, ptr::null_mut(), 0)
645 fn directory_junctions_are_directories() {
648 use rand::{self, StdRng, Rng};
652 ($e:expr) => (match $e {
654 Err(e) => panic!("{} failed with: {}", stringify!($e), e),
658 let d = DirBuilder::new();
659 let p = env::temp_dir();
660 let mut r = rand::thread_rng();
661 let ret = p.join(&format!("rust-{}", r.next_u32()));
662 let foo = ret.join("foo");
663 let bar = ret.join("bar");
668 t!(create_junction(&bar, &foo));
669 let metadata = stat(&bar);
670 t!(delete_junction(&bar));
676 let metadata = t!(metadata);
677 assert!(metadata.file_type().is_dir());
679 // Creating a directory junction on windows involves dealing with reparse
680 // points and the DeviceIoControl function, and this code is a skeleton of
681 // what can be found here:
683 // http://www.flexhex.com/docs/articles/hard-links.phtml
684 fn create_junction(src: &Path, dst: &Path) -> io::Result<()> {
685 let f = try!(opendir(src, true));
686 let h = f.handle().raw();
689 let mut data = [0u8; c::MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
690 let mut db = data.as_mut_ptr()
691 as *mut c::REPARSE_MOUNTPOINT_DATA_BUFFER;
692 let mut buf = &mut (*db).ReparseTarget as *mut _;
695 let v = v.iter().map(|x| *x as u16);
696 for c in v.chain(dst.as_os_str().encode_wide()) {
702 (*db).ReparseTag = c::IO_REPARSE_TAG_MOUNT_POINT;
703 (*db).ReparseTargetMaximumLength = (i * 2) as c::WORD;
704 (*db).ReparseTargetLength = ((i - 1) * 2) as c::WORD;
705 (*db).ReparseDataLength =
706 (*db).ReparseTargetLength as c::DWORD + 12;
709 cvt(c::DeviceIoControl(h as *mut _,
710 c::FSCTL_SET_REPARSE_POINT,
711 data.as_ptr() as *mut _,
712 (*db).ReparseDataLength + 8,
715 ptr::null_mut())).map(|_| ())
719 fn opendir(p: &Path, write: bool) -> io::Result<File> {
721 let mut token = ptr::null_mut();
722 let mut tp: c::TOKEN_PRIVILEGES = mem::zeroed();
723 try!(cvt(c::OpenProcessToken(c::GetCurrentProcess(),
724 c::TOKEN_ADJUST_PRIVILEGES,
726 let name: &OsStr = if write {
727 "SeRestorePrivilege".as_ref()
729 "SeBackupPrivilege".as_ref()
731 let name = name.encode_wide().chain(Some(0)).collect::<Vec<_>>();
732 try!(cvt(c::LookupPrivilegeValueW(ptr::null(),
734 &mut tp.Privileges[0].Luid)));
735 tp.PrivilegeCount = 1;
736 tp.Privileges[0].Attributes = c::SE_PRIVILEGE_ENABLED;
737 let size = mem::size_of::<c::TOKEN_PRIVILEGES>() as c::DWORD;
738 try!(cvt(c::AdjustTokenPrivileges(token, c::FALSE, &mut tp, size,
739 ptr::null_mut(), ptr::null_mut())));
740 try!(cvt(c::CloseHandle(token)));
742 File::open_reparse_point(p, write)
746 fn delete_junction(p: &Path) -> io::Result<()> {
748 let f = try!(opendir(p, true));
749 let h = f.handle().raw();
750 let mut data = [0u8; c::MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
751 let mut db = data.as_mut_ptr()
752 as *mut c::REPARSE_MOUNTPOINT_DATA_BUFFER;
753 (*db).ReparseTag = c::IO_REPARSE_TAG_MOUNT_POINT;
755 cvt(c::DeviceIoControl(h as *mut _,
756 c::FSCTL_DELETE_REPARSE_POINT,
757 data.as_ptr() as *mut _,
758 (*db).ReparseDataLength + 8,
761 ptr::null_mut())).map(|_| ())