-
Notifications
You must be signed in to change notification settings - Fork 12.6k
/
fs.rs
460 lines (413 loc) · 15.1 KB
/
fs.rs
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
//! Blocking Windows-based file I/O
use alloc::arc::Arc;
use libc::{mod, c_int};
use c_str::CString;
use mem;
use os::windows::fill_utf16_buf_and_decode;
use path;
use ptr;
use str;
use io;
use prelude::*;
use sys;
use sys_common::{keep_going, eof, mkerr_libc};
use io::{FilePermission, Write, UnstableFileStat, Open, FileAccess, FileMode};
use io::{IoResult, IoError, FileStat, SeekStyle, Seek, Writer, Reader};
use io::{Read, Truncate, SeekCur, SeekSet, ReadWrite, SeekEnd, Append};
pub use path::WindowsPath as Path;
pub type fd_t = libc::c_int;
pub struct FileDesc {
/// The underlying C file descriptor.
pub fd: fd_t,
/// Whether to close the file descriptor on drop.
close_on_drop: bool,
}
impl FileDesc {
pub fn new(fd: fd_t, close_on_drop: bool) -> FileDesc {
FileDesc { fd: fd, close_on_drop: close_on_drop }
}
pub fn read(&self, buf: &mut [u8]) -> IoResult<uint> {
let mut read = 0;
let ret = unsafe {
libc::ReadFile(self.handle(), buf.as_ptr() as libc::LPVOID,
buf.len() as libc::DWORD, &mut read,
ptr::null_mut())
};
if ret != 0 {
Ok(read as uint)
} else {
Err(super::last_error())
}
}
pub fn write(&self, buf: &[u8]) -> IoResult<()> {
let mut cur = buf.as_ptr();
let mut remaining = buf.len();
while remaining > 0 {
let mut amt = 0;
let ret = unsafe {
libc::WriteFile(self.handle(), cur as libc::LPVOID,
remaining as libc::DWORD, &mut amt,
ptr::null_mut())
};
if ret != 0 {
remaining -= amt as uint;
cur = unsafe { cur.offset(amt as int) };
} else {
return Err(super::last_error())
}
}
Ok(())
}
pub fn fd(&self) -> fd_t { self.fd }
pub fn handle(&self) -> libc::HANDLE {
unsafe { libc::get_osfhandle(self.fd()) as libc::HANDLE }
}
// A version of seek that takes &self so that tell can call it
// - the private seek should of course take &mut self.
fn seek_common(&self, pos: i64, style: SeekStyle) -> IoResult<u64> {
let whence = match style {
SeekSet => libc::FILE_BEGIN,
SeekEnd => libc::FILE_END,
SeekCur => libc::FILE_CURRENT,
};
unsafe {
let mut newpos = 0;
match libc::SetFilePointerEx(self.handle(), pos, &mut newpos, whence) {
0 => Err(super::last_error()),
_ => Ok(newpos as u64),
}
}
}
pub fn seek(&mut self, pos: i64, style: SeekStyle) -> IoResult<u64> {
self.seek_common(pos, style)
}
pub fn tell(&self) -> IoResult<u64> {
self.seek_common(0, SeekCur)
}
pub fn fsync(&mut self) -> IoResult<()> {
super::mkerr_winbool(unsafe {
libc::FlushFileBuffers(self.handle())
})
}
pub fn datasync(&mut self) -> IoResult<()> { return self.fsync(); }
pub fn truncate(&mut self, offset: i64) -> IoResult<()> {
let orig_pos = try!(self.tell());
let _ = try!(self.seek(offset, SeekSet));
let ret = unsafe {
match libc::SetEndOfFile(self.handle()) {
0 => Err(super::last_error()),
_ => Ok(())
}
};
let _ = self.seek(orig_pos as i64, SeekSet);
return ret;
}
pub fn fstat(&mut self) -> IoResult<io::FileStat> {
let mut stat: libc::stat = unsafe { mem::zeroed() };
match unsafe { libc::fstat(self.fd(), &mut stat) } {
0 => Ok(mkstat(&stat)),
_ => Err(super::last_error()),
}
}
/// Extract the actual filedescriptor without closing it.
pub fn unwrap(self) -> fd_t {
let fd = self.fd;
unsafe { mem::forget(self) };
fd
}
}
impl Drop for FileDesc {
fn drop(&mut self) {
// closing stdio file handles makes no sense, so never do it. Also, note
// that errors are ignored when closing a file descriptor. The reason
// for this is that if an error occurs we don't actually know if the
// file descriptor was closed or not, and if we retried (for something
// like EINTR), we might close another valid file descriptor (opened
// after we closed ours.
if self.close_on_drop && self.fd > libc::STDERR_FILENO {
let n = unsafe { libc::close(self.fd) };
if n != 0 {
println!("error {} when closing file descriptor {}", n, self.fd);
}
}
}
}
pub fn to_utf16(s: &Path) -> IoResult<Vec<u16>> {
sys::to_utf16(s.as_str())
}
pub fn open(path: &Path, fm: FileMode, fa: FileAccess) -> IoResult<FileDesc> {
// Flags passed to open_osfhandle
let flags = match fm {
Open => 0,
Append => libc::O_APPEND,
Truncate => libc::O_TRUNC,
};
let flags = match fa {
Read => flags | libc::O_RDONLY,
Write => flags | libc::O_WRONLY | libc::O_CREAT,
ReadWrite => flags | libc::O_RDWR | libc::O_CREAT,
};
let mut dwDesiredAccess = match fa {
Read => libc::FILE_GENERIC_READ,
Write => libc::FILE_GENERIC_WRITE,
ReadWrite => libc::FILE_GENERIC_READ | libc::FILE_GENERIC_WRITE
};
// libuv has a good comment about this, but the basic idea is what we try to
// emulate unix semantics by enabling all sharing by allowing things such as
// deleting a file while it's still open.
let dwShareMode = libc::FILE_SHARE_READ | libc::FILE_SHARE_WRITE |
libc::FILE_SHARE_DELETE;
let dwCreationDisposition = match (fm, fa) {
(Truncate, Read) => libc::TRUNCATE_EXISTING,
(Truncate, _) => libc::CREATE_ALWAYS,
(Open, Read) => libc::OPEN_EXISTING,
(Open, _) => libc::OPEN_ALWAYS,
(Append, Read) => {
dwDesiredAccess |= libc::FILE_APPEND_DATA;
libc::OPEN_EXISTING
}
(Append, _) => {
dwDesiredAccess &= !libc::FILE_WRITE_DATA;
dwDesiredAccess |= libc::FILE_APPEND_DATA;
libc::OPEN_ALWAYS
}
};
let mut dwFlagsAndAttributes = libc::FILE_ATTRIBUTE_NORMAL;
// Compat with unix, this allows opening directories (see libuv)
dwFlagsAndAttributes |= libc::FILE_FLAG_BACKUP_SEMANTICS;
let path = try!(to_utf16(path));
let handle = unsafe {
libc::CreateFileW(path.as_ptr(),
dwDesiredAccess,
dwShareMode,
ptr::null_mut(),
dwCreationDisposition,
dwFlagsAndAttributes,
ptr::null_mut())
};
if handle == libc::INVALID_HANDLE_VALUE {
Err(super::last_error())
} else {
let fd = unsafe {
libc::open_osfhandle(handle as libc::intptr_t, flags)
};
if fd < 0 {
let _ = unsafe { libc::CloseHandle(handle) };
Err(super::last_error())
} else {
Ok(FileDesc::new(fd, true))
}
}
}
pub fn mkdir(p: &Path, _mode: uint) -> IoResult<()> {
let p = try!(to_utf16(p));
super::mkerr_winbool(unsafe {
// FIXME: turn mode into something useful? #2623
libc::CreateDirectoryW(p.as_ptr(), ptr::null_mut())
})
}
pub fn readdir(p: &Path) -> IoResult<Vec<Path>> {
fn prune(root: &Path, dirs: Vec<Path>) -> Vec<Path> {
dirs.into_iter().filter(|path| {
path.as_vec() != b"." && path.as_vec() != b".."
}).map(|path| root.join(path)).collect()
}
let star = p.join("*");
let path = try!(to_utf16(&star));
unsafe {
let mut wfd = mem::zeroed();
let find_handle = libc::FindFirstFileW(path.as_ptr(), &mut wfd);
if find_handle != libc::INVALID_HANDLE_VALUE {
let mut paths = vec![];
let mut more_files = 1 as libc::BOOL;
while more_files != 0 {
{
let filename = str::truncate_utf16_at_nul(&wfd.cFileName);
match String::from_utf16(filename) {
Some(filename) => paths.push(Path::new(filename)),
None => {
assert!(libc::FindClose(find_handle) != 0);
return Err(IoError {
kind: io::InvalidInput,
desc: "path was not valid UTF-16",
detail: Some(format!("path was not valid UTF-16: {}", filename)),
})
}, // FIXME #12056: Convert the UCS-2 to invalid utf-8 instead of erroring
}
}
more_files = libc::FindNextFileW(find_handle, &mut wfd);
}
assert!(libc::FindClose(find_handle) != 0);
Ok(prune(p, paths))
} else {
Err(super::last_error())
}
}
}
pub fn unlink(p: &Path) -> IoResult<()> {
fn do_unlink(p_utf16: &Vec<u16>) -> IoResult<()> {
super::mkerr_winbool(unsafe { libc::DeleteFileW(p_utf16.as_ptr()) })
}
let p_utf16 = try!(to_utf16(p));
let res = do_unlink(&p_utf16);
match res {
Ok(()) => Ok(()),
Err(e) => {
// FIXME: change the code below to use more direct calls
// than `stat` and `chmod`, to avoid re-conversion to
// utf16 etc.
// On unix, a readonly file can be successfully removed. On windows,
// however, it cannot. To keep the two platforms in line with
// respect to their behavior, catch this case on windows, attempt to
// change it to read-write, and then remove the file.
if e.kind == io::PermissionDenied {
let stat = match stat(p) {
Ok(stat) => stat,
Err(..) => return Err(e),
};
if stat.perm.intersects(io::USER_WRITE) { return Err(e) }
match chmod(p, (stat.perm | io::USER_WRITE).bits() as uint) {
Ok(()) => do_unlink(&p_utf16),
Err(..) => {
// Try to put it back as we found it
let _ = chmod(p, stat.perm.bits() as uint);
Err(e)
}
}
} else {
Err(e)
}
}
}
}
pub fn rename(old: &Path, new: &Path) -> IoResult<()> {
let old = try!(to_utf16(old));
let new = try!(to_utf16(new));
super::mkerr_winbool(unsafe {
libc::MoveFileExW(old.as_ptr(), new.as_ptr(), libc::MOVEFILE_REPLACE_EXISTING)
})
}
pub fn chmod(p: &Path, mode: uint) -> IoResult<()> {
let p = try!(to_utf16(p));
mkerr_libc(unsafe {
libc::wchmod(p.as_ptr(), mode as libc::c_int)
})
}
pub fn rmdir(p: &Path) -> IoResult<()> {
let p = try!(to_utf16(p));
mkerr_libc(unsafe { libc::wrmdir(p.as_ptr()) })
}
pub fn chown(_p: &Path, _uid: int, _gid: int) -> IoResult<()> {
// libuv has this as a no-op, so seems like this should as well?
Ok(())
}
pub fn readlink(p: &Path) -> IoResult<Path> {
// FIXME: I have a feeling that this reads intermediate symlinks as well.
use sys::c::compat::kernel32::GetFinalPathNameByHandleW;
let p = try!(to_utf16(p));
let handle = unsafe {
libc::CreateFileW(p.as_ptr(),
libc::GENERIC_READ,
libc::FILE_SHARE_READ,
ptr::null_mut(),
libc::OPEN_EXISTING,
libc::FILE_ATTRIBUTE_NORMAL,
ptr::null_mut())
};
if handle == libc::INVALID_HANDLE_VALUE {
return Err(super::last_error())
}
// Specify (sz - 1) because the documentation states that it's the size
// without the null pointer
let ret = fill_utf16_buf_and_decode(|buf, sz| unsafe {
GetFinalPathNameByHandleW(handle,
buf as *const u16,
sz - 1,
libc::VOLUME_NAME_DOS)
});
let ret = match ret {
Some(ref s) if s.as_slice().starts_with(r"\\?\") => { // "
Ok(Path::new(s.as_slice().slice_from(4)))
}
Some(s) => Ok(Path::new(s)),
None => Err(super::last_error()),
};
assert!(unsafe { libc::CloseHandle(handle) } != 0);
return ret;
}
pub fn symlink(src: &Path, dst: &Path) -> IoResult<()> {
use sys::c::compat::kernel32::CreateSymbolicLinkW;
let src = try!(to_utf16(src));
let dst = try!(to_utf16(dst));
super::mkerr_winbool(unsafe {
CreateSymbolicLinkW(dst.as_ptr(), src.as_ptr(), 0) as libc::BOOL
})
}
pub fn link(src: &Path, dst: &Path) -> IoResult<()> {
let src = try!(to_utf16(src));
let dst = try!(to_utf16(dst));
super::mkerr_winbool(unsafe {
libc::CreateHardLinkW(dst.as_ptr(), src.as_ptr(), ptr::null_mut())
})
}
fn mkstat(stat: &libc::stat) -> FileStat {
FileStat {
size: stat.st_size as u64,
kind: match (stat.st_mode as libc::c_int) & libc::S_IFMT {
libc::S_IFREG => io::TypeFile,
libc::S_IFDIR => io::TypeDirectory,
libc::S_IFIFO => io::TypeNamedPipe,
libc::S_IFBLK => io::TypeBlockSpecial,
libc::S_IFLNK => io::TypeSymlink,
_ => io::TypeUnknown,
},
perm: FilePermission::from_bits_truncate(stat.st_mode as u32),
created: stat.st_ctime as u64,
modified: stat.st_mtime as u64,
accessed: stat.st_atime as u64,
unstable: UnstableFileStat {
device: stat.st_dev as u64,
inode: stat.st_ino as u64,
rdev: stat.st_rdev as u64,
nlink: stat.st_nlink as u64,
uid: stat.st_uid as u64,
gid: stat.st_gid as u64,
blksize:0,
blocks: 0,
flags: 0,
gen: 0,
},
}
}
pub fn stat(p: &Path) -> IoResult<FileStat> {
let mut stat: libc::stat = unsafe { mem::zeroed() };
let p = try!(to_utf16(p));
match unsafe { libc::wstat(p.as_ptr(), &mut stat) } {
0 => Ok(mkstat(&stat)),
_ => Err(super::last_error()),
}
}
// FIXME: move this to platform-specific modules (for now)?
pub fn lstat(_p: &Path) -> IoResult<FileStat> {
// FIXME: implementation is missing
Err(super::unimpl())
}
pub fn utime(p: &Path, atime: u64, mtime: u64) -> IoResult<()> {
let mut buf = libc::utimbuf {
actime: atime as libc::time64_t,
modtime: mtime as libc::time64_t,
};
let p = try!(to_utf16(p));
mkerr_libc(unsafe {
libc::wutime(p.as_ptr(), &mut buf)
})
}