-
Notifications
You must be signed in to change notification settings - Fork 12.5k
/
os.rs
2194 lines (1944 loc) · 68 KB
/
os.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
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
// Copyright 2012-2014 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.
/*!
* Higher-level interfaces to libc::* functions and operating system services.
*
* In general these take and return rust types, use rust idioms (enums,
* closures, vectors) rather than C idioms, and do more extensive safety
* checks.
*
* This module is not meant to only contain 1:1 mappings to libc entries; any
* os-interface code that is reasonably useful and broadly applicable can go
* here. Including utility routines that merely build on other os code.
*
* We assume the general case is that users do not care, and do not want to
* be made to care, which operating system they are on. While they may want
* to special case various special cases -- and so we will not _hide_ the
* facts of which OS the user is on -- they should be given the opportunity
* to write OS-ignorant code by default.
*/
#![experimental]
#![allow(missing_doc)]
#![allow(non_snake_case_functions)]
use clone::Clone;
use collections::Collection;
use fmt;
use io::{IoResult, IoError};
use iter::Iterator;
use libc::{c_void, c_int};
use libc;
use ops::Drop;
use option::{Some, None, Option};
use os;
use path::{Path, GenericPath, BytesContainer};
use ptr::RawPtr;
use ptr;
use result::{Err, Ok, Result};
use slice::{Vector, ImmutableVector, MutableVector, ImmutableEqVector};
use str::{Str, StrSlice, StrAllocating};
use str;
use string::String;
use sync::atomics::{AtomicInt, INIT_ATOMIC_INT, SeqCst};
use vec::Vec;
#[cfg(unix)]
use c_str::ToCStr;
#[cfg(unix)]
use libc::c_char;
#[cfg(windows)]
use str::OwnedStr;
/// Get the number of cores available
pub fn num_cpus() -> uint {
unsafe {
return rust_get_num_cpus();
}
extern {
fn rust_get_num_cpus() -> libc::uintptr_t;
}
}
pub static TMPBUF_SZ : uint = 1000u;
static BUF_BYTES : uint = 2048u;
/// Returns the current working directory as a Path.
///
/// # Failure
///
/// Fails if the current working directory value is invalid:
/// Possibles cases:
///
/// * Current directory does not exist.
/// * There are insufficient permissions to access the current directory.
///
/// # Example
///
/// ```rust
/// use std::os;
///
/// // We assume that we are in a valid directory like "/home".
/// let current_working_directory = os::getcwd();
/// println!("The current directory is {}", current_working_directory.display());
/// // /home
/// ```
#[cfg(unix)]
pub fn getcwd() -> Path {
use c_str::CString;
let mut buf = [0 as c_char, ..BUF_BYTES];
unsafe {
if libc::getcwd(buf.as_mut_ptr(), buf.len() as libc::size_t).is_null() {
fail!()
}
Path::new(CString::new(buf.as_ptr(), false))
}
}
/// Returns the current working directory as a Path.
///
/// # Failure
///
/// Fails if the current working directory value is invalid.
/// Possibles cases:
///
/// * Current directory does not exist.
/// * There are insufficient permissions to access the current directory.
///
/// # Example
///
/// ```rust
/// use std::os;
///
/// // We assume that we are in a valid directory like "C:\\Windows".
/// let current_working_directory = os::getcwd();
/// println!("The current directory is {}", current_working_directory.display());
/// // C:\\Windows
/// ```
#[cfg(windows)]
pub fn getcwd() -> Path {
use libc::DWORD;
use libc::GetCurrentDirectoryW;
let mut buf = [0 as u16, ..BUF_BYTES];
unsafe {
if libc::GetCurrentDirectoryW(buf.len() as DWORD, buf.as_mut_ptr()) == 0 as DWORD {
fail!();
}
}
Path::new(String::from_utf16(str::truncate_utf16_at_nul(buf))
.expect("GetCurrentDirectoryW returned invalid UTF-16"))
}
#[cfg(windows)]
pub mod win32 {
use libc::types::os::arch::extra::DWORD;
use libc;
use option::{None, Option};
use option;
use os::TMPBUF_SZ;
use slice::{MutableVector, ImmutableVector};
use string::String;
use str::StrSlice;
use str;
use vec::Vec;
pub fn fill_utf16_buf_and_decode(f: |*mut u16, DWORD| -> DWORD)
-> Option<String> {
unsafe {
let mut n = TMPBUF_SZ as DWORD;
let mut res = None;
let mut done = false;
while !done {
let mut buf = Vec::from_elem(n as uint, 0u16);
let k = f(buf.as_mut_ptr(), n);
if k == (0 as DWORD) {
done = true;
} else if k == n &&
libc::GetLastError() ==
libc::ERROR_INSUFFICIENT_BUFFER as DWORD {
n *= 2 as DWORD;
} else if k >= n {
n = k;
} else {
done = true;
}
if k != 0 && done {
let sub = buf.slice(0, k as uint);
// We want to explicitly catch the case when the
// closure returned invalid UTF-16, rather than
// set `res` to None and continue.
let s = String::from_utf16(sub)
.expect("fill_utf16_buf_and_decode: closure created invalid UTF-16");
res = option::Some(s)
}
}
return res;
}
}
}
/*
Accessing environment variables is not generally threadsafe.
Serialize access through a global lock.
*/
fn with_env_lock<T>(f: || -> T) -> T {
use rt::mutex::{StaticNativeMutex, NATIVE_MUTEX_INIT};
static mut lock: StaticNativeMutex = NATIVE_MUTEX_INIT;
unsafe {
let _guard = lock.lock();
f()
}
}
/// Returns a vector of (variable, value) pairs, for all the environment
/// variables of the current process.
///
/// Invalid UTF-8 bytes are replaced with \uFFFD. See `str::from_utf8_lossy()`
/// for details.
///
/// # Example
///
/// ```rust
/// use std::os;
///
/// // We will iterate through the references to the element returned by os::env();
/// for &(ref key, ref value) in os::env().iter() {
/// println!("'{}': '{}'", key, value );
/// }
/// ```
pub fn env() -> Vec<(String,String)> {
env_as_bytes().move_iter().map(|(k,v)| {
let k = String::from_str(str::from_utf8_lossy(k.as_slice()).as_slice());
let v = String::from_str(str::from_utf8_lossy(v.as_slice()).as_slice());
(k,v)
}).collect()
}
/// Returns a vector of (variable, value) byte-vector pairs for all the
/// environment variables of the current process.
pub fn env_as_bytes() -> Vec<(Vec<u8>,Vec<u8>)> {
unsafe {
#[cfg(windows)]
unsafe fn get_env_pairs() -> Vec<Vec<u8>> {
use slice::raw;
use libc::funcs::extra::kernel32::{
GetEnvironmentStringsW,
FreeEnvironmentStringsW
};
let ch = GetEnvironmentStringsW();
if ch as uint == 0 {
fail!("os::env() failure getting env string from OS: {}",
os::last_os_error());
}
// Here, we lossily decode the string as UTF16.
//
// The docs suggest that the result should be in Unicode, but
// Windows doesn't guarantee it's actually UTF16 -- it doesn't
// validate the environment string passed to CreateProcess nor
// SetEnvironmentVariable. Yet, it's unlikely that returning a
// raw u16 buffer would be of practical use since the result would
// be inherently platform-dependent and introduce additional
// complexity to this code.
//
// Using the non-Unicode version of GetEnvironmentStrings is even
// worse since the result is in an OEM code page. Characters that
// can't be encoded in the code page would be turned into question
// marks.
let mut result = Vec::new();
let mut i = 0;
while *ch.offset(i) != 0 {
let p = &*ch.offset(i);
let len = ptr::position(p, |c| *c == 0);
raw::buf_as_slice(p, len, |s| {
result.push(str::from_utf16_lossy(s).into_bytes());
});
i += len as int + 1;
}
FreeEnvironmentStringsW(ch);
result
}
#[cfg(unix)]
unsafe fn get_env_pairs() -> Vec<Vec<u8>> {
use c_str::CString;
extern {
fn rust_env_pairs() -> *const *const c_char;
}
let environ = rust_env_pairs();
if environ as uint == 0 {
fail!("os::env() failure getting env string from OS: {}",
os::last_os_error());
}
let mut result = Vec::new();
ptr::array_each(environ, |e| {
let env_pair =
Vec::from_slice(CString::new(e, false).as_bytes_no_nul());
result.push(env_pair);
});
result
}
fn env_convert(input: Vec<Vec<u8>>) -> Vec<(Vec<u8>, Vec<u8>)> {
let mut pairs = Vec::new();
for p in input.iter() {
let mut it = p.as_slice().splitn(1, |b| *b == '=' as u8);
let key = Vec::from_slice(it.next().unwrap());
let val = Vec::from_slice(it.next().unwrap_or(&[]));
pairs.push((key, val));
}
pairs
}
with_env_lock(|| {
let unparsed_environ = get_env_pairs();
env_convert(unparsed_environ)
})
}
}
#[cfg(unix)]
/// Fetches the environment variable `n` from the current process, returning
/// None if the variable isn't set.
///
/// Any invalid UTF-8 bytes in the value are replaced by \uFFFD. See
/// `str::from_utf8_lossy()` for details.
///
/// # Failure
///
/// Fails if `n` has any interior NULs.
///
/// # Example
///
/// ```rust
/// use std::os;
///
/// let key = "HOME";
/// match os::getenv(key) {
/// Some(val) => println!("{}: {}", key, val),
/// None => println!("{} is not defined in the environment.", key)
/// }
/// ```
pub fn getenv(n: &str) -> Option<String> {
getenv_as_bytes(n).map(|v| String::from_str(str::from_utf8_lossy(v.as_slice()).as_slice()))
}
#[cfg(unix)]
/// Fetches the environment variable `n` byte vector from the current process,
/// returning None if the variable isn't set.
///
/// # Failure
///
/// Fails if `n` has any interior NULs.
pub fn getenv_as_bytes(n: &str) -> Option<Vec<u8>> {
use c_str::CString;
unsafe {
with_env_lock(|| {
let s = n.with_c_str(|buf| libc::getenv(buf));
if s.is_null() {
None
} else {
Some(Vec::from_slice(CString::new(s as *const i8,
false).as_bytes_no_nul()))
}
})
}
}
#[cfg(windows)]
/// Fetches the environment variable `n` from the current process, returning
/// None if the variable isn't set.
pub fn getenv(n: &str) -> Option<String> {
unsafe {
with_env_lock(|| {
use os::win32::{fill_utf16_buf_and_decode};
let n: Vec<u16> = n.utf16_units().collect();
let n = n.append_one(0);
fill_utf16_buf_and_decode(|buf, sz| {
libc::GetEnvironmentVariableW(n.as_ptr(), buf, sz)
})
})
}
}
#[cfg(windows)]
/// Fetches the environment variable `n` byte vector from the current process,
/// returning None if the variable isn't set.
pub fn getenv_as_bytes(n: &str) -> Option<Vec<u8>> {
getenv(n).map(|s| s.into_bytes())
}
/// Sets the environment variable `n` to the value `v` for the currently running
/// process.
///
/// # Example
///
/// ```rust
/// use std::os;
///
/// let key = "KEY";
/// os::setenv(key, "VALUE");
/// match os::getenv(key) {
/// Some(ref val) => println!("{}: {}", key, val),
/// None => println!("{} is not defined in the environment.", key)
/// }
/// ```
pub fn setenv<T: BytesContainer>(n: &str, v: T) {
#[cfg(unix)]
fn _setenv(n: &str, v: &[u8]) {
unsafe {
with_env_lock(|| {
n.with_c_str(|nbuf| {
v.with_c_str(|vbuf| {
libc::funcs::posix01::unistd::setenv(nbuf, vbuf, 1);
})
})
})
}
}
#[cfg(windows)]
fn _setenv(n: &str, v: &[u8]) {
let n: Vec<u16> = n.utf16_units().collect();
let n = n.append_one(0);
let v: Vec<u16> = str::from_utf8(v).unwrap().utf16_units().collect();
let v = v.append_one(0);
unsafe {
with_env_lock(|| {
libc::SetEnvironmentVariableW(n.as_ptr(), v.as_ptr());
})
}
}
_setenv(n, v.container_as_bytes())
}
/// Remove a variable from the environment entirely.
pub fn unsetenv(n: &str) {
#[cfg(unix)]
fn _unsetenv(n: &str) {
unsafe {
with_env_lock(|| {
n.with_c_str(|nbuf| {
libc::funcs::posix01::unistd::unsetenv(nbuf);
})
})
}
}
#[cfg(windows)]
fn _unsetenv(n: &str) {
let n: Vec<u16> = n.utf16_units().collect();
let n = n.append_one(0);
unsafe {
with_env_lock(|| {
libc::SetEnvironmentVariableW(n.as_ptr(), ptr::null());
})
}
}
_unsetenv(n);
}
/// Parses input according to platform conventions for the `PATH`
/// environment variable.
///
/// # Example
/// ```rust
/// use std::os;
///
/// let key = "PATH";
/// match os::getenv_as_bytes(key) {
/// Some(paths) => {
/// for path in os::split_paths(paths).iter() {
/// println!("'{}'", path.display());
/// }
/// }
/// None => println!("{} is not defined in the environment.", key)
/// }
/// ```
pub fn split_paths<T: BytesContainer>(unparsed: T) -> Vec<Path> {
#[cfg(unix)]
fn _split_paths<T: BytesContainer>(unparsed: T) -> Vec<Path> {
unparsed.container_as_bytes()
.split(|b| *b == b':')
.map(Path::new)
.collect()
}
#[cfg(windows)]
fn _split_paths<T: BytesContainer>(unparsed: T) -> Vec<Path> {
// On Windows, the PATH environment variable is semicolon separated. Double
// quotes are used as a way of introducing literal semicolons (since
// c:\some;dir is a valid Windows path). Double quotes are not themselves
// permitted in path names, so there is no way to escape a double quote.
// Quoted regions can appear in arbitrary locations, so
//
// c:\foo;c:\som"e;di"r;c:\bar
//
// Should parse as [c:\foo, c:\some;dir, c:\bar].
//
// (The above is based on testing; there is no clear reference available
// for the grammar.)
let mut parsed = Vec::new();
let mut in_progress = Vec::new();
let mut in_quote = false;
for b in unparsed.container_as_bytes().iter() {
match *b {
b';' if !in_quote => {
parsed.push(Path::new(in_progress.as_slice()));
in_progress.truncate(0)
}
b'"' => {
in_quote = !in_quote;
}
_ => {
in_progress.push(*b);
}
}
}
parsed.push(Path::new(in_progress));
parsed
}
_split_paths(unparsed)
}
/// Joins a collection of `Path`s appropriately for the `PATH`
/// environment variable.
///
/// Returns a `Vec<u8>` on success, since `Path`s are not utf-8
/// encoded on all platforms.
///
/// Returns an `Err` (containing an error message) if one of the input
/// `Path`s contains an invalid character for constructing the `PATH`
/// variable (a double quote on Windows or a colon on Unix).
///
/// # Example
///
/// ```rust
/// use std::os;
/// use std::path::Path;
///
/// let key = "PATH";
/// let mut paths = os::getenv_as_bytes(key).map_or(Vec::new(), os::split_paths);
/// paths.push(Path::new("/home/xyz/bin"));
/// os::setenv(key, os::join_paths(paths.as_slice()).unwrap());
/// ```
pub fn join_paths<T: BytesContainer>(paths: &[T]) -> Result<Vec<u8>, &'static str> {
#[cfg(windows)]
fn _join_paths<T: BytesContainer>(paths: &[T]) -> Result<Vec<u8>, &'static str> {
let mut joined = Vec::new();
let sep = b';';
for (i, path) in paths.iter().map(|p| p.container_as_bytes()).enumerate() {
if i > 0 { joined.push(sep) }
if path.contains(&b'"') {
return Err("path segment contains `\"`");
} else if path.contains(&sep) {
joined.push(b'"');
joined.push_all(path);
joined.push(b'"');
} else {
joined.push_all(path);
}
}
Ok(joined)
}
#[cfg(unix)]
fn _join_paths<T: BytesContainer>(paths: &[T]) -> Result<Vec<u8>, &'static str> {
let mut joined = Vec::new();
let sep = b':';
for (i, path) in paths.iter().map(|p| p.container_as_bytes()).enumerate() {
if i > 0 { joined.push(sep) }
if path.contains(&sep) { return Err("path segment contains separator `:`") }
joined.push_all(path);
}
Ok(joined)
}
_join_paths(paths)
}
/// A low-level OS in-memory pipe.
pub struct Pipe {
/// A file descriptor representing the reading end of the pipe. Data written
/// on the `out` file descriptor can be read from this file descriptor.
pub reader: c_int,
/// A file descriptor representing the write end of the pipe. Data written
/// to this file descriptor can be read from the `input` file descriptor.
pub writer: c_int,
}
/// Creates a new low-level OS in-memory pipe.
///
/// This function can fail to succeed if there are no more resources available
/// to allocate a pipe.
///
/// This function is also unsafe as there is no destructor associated with the
/// `Pipe` structure will return. If it is not arranged for the returned file
/// descriptors to be closed, the file descriptors will leak. For safe handling
/// of this scenario, use `std::io::PipeStream` instead.
pub unsafe fn pipe() -> IoResult<Pipe> {
return _pipe();
#[cfg(unix)]
unsafe fn _pipe() -> IoResult<Pipe> {
let mut fds = [0, ..2];
match libc::pipe(fds.as_mut_ptr()) {
0 => Ok(Pipe { reader: fds[0], writer: fds[1] }),
_ => Err(IoError::last_error()),
}
}
#[cfg(windows)]
unsafe fn _pipe() -> IoResult<Pipe> {
// Windows pipes work subtly differently than unix pipes, and their
// inheritance has to be handled in a different way that I do not
// fully understand. Here we explicitly make the pipe non-inheritable,
// which means to pass it to a subprocess they need to be duplicated
// first, as in std::run.
let mut fds = [0, ..2];
match libc::pipe(fds.as_mut_ptr(), 1024 as ::libc::c_uint,
(libc::O_BINARY | libc::O_NOINHERIT) as c_int) {
0 => {
assert!(fds[0] != -1 && fds[0] != 0);
assert!(fds[1] != -1 && fds[1] != 0);
Ok(Pipe { reader: fds[0], writer: fds[1] })
}
_ => Err(IoError::last_error()),
}
}
}
/// Returns the proper dll filename for the given basename of a file
/// as a String.
#[cfg(not(target_os="ios"))]
pub fn dll_filename(base: &str) -> String {
format!("{}{}{}", consts::DLL_PREFIX, base, consts::DLL_SUFFIX)
}
/// Optionally returns the filesystem path to the current executable which is
/// running but with the executable name.
///
/// # Examples
///
/// ```rust
/// use std::os;
///
/// match os::self_exe_name() {
/// Some(exe_path) => println!("Path of this executable is: {}", exe_path.display()),
/// None => println!("Unable to get the path of this executable!")
/// };
/// ```
pub fn self_exe_name() -> Option<Path> {
#[cfg(target_os = "freebsd")]
fn load_self() -> Option<Vec<u8>> {
unsafe {
use libc::funcs::bsd44::*;
use libc::consts::os::extra::*;
let mut mib = vec![CTL_KERN as c_int,
KERN_PROC as c_int,
KERN_PROC_PATHNAME as c_int,
-1 as c_int];
let mut sz: libc::size_t = 0;
let err = sysctl(mib.as_mut_ptr(), mib.len() as ::libc::c_uint,
ptr::mut_null(), &mut sz, ptr::mut_null(),
0u as libc::size_t);
if err != 0 { return None; }
if sz == 0 { return None; }
let mut v: Vec<u8> = Vec::with_capacity(sz as uint);
let err = sysctl(mib.as_mut_ptr(), mib.len() as ::libc::c_uint,
v.as_mut_ptr() as *mut c_void, &mut sz,
ptr::mut_null(), 0u as libc::size_t);
if err != 0 { return None; }
if sz == 0 { return None; }
v.set_len(sz as uint - 1); // chop off trailing NUL
Some(v)
}
}
#[cfg(target_os = "linux")]
#[cfg(target_os = "android")]
fn load_self() -> Option<Vec<u8>> {
use std::io;
match io::fs::readlink(&Path::new("/proc/self/exe")) {
Ok(path) => Some(path.into_vec()),
Err(..) => None
}
}
#[cfg(target_os = "macos")]
#[cfg(target_os = "ios")]
fn load_self() -> Option<Vec<u8>> {
unsafe {
use libc::funcs::extra::_NSGetExecutablePath;
let mut sz: u32 = 0;
_NSGetExecutablePath(ptr::mut_null(), &mut sz);
if sz == 0 { return None; }
let mut v: Vec<u8> = Vec::with_capacity(sz as uint);
let err = _NSGetExecutablePath(v.as_mut_ptr() as *mut i8, &mut sz);
if err != 0 { return None; }
v.set_len(sz as uint - 1); // chop off trailing NUL
Some(v)
}
}
#[cfg(windows)]
fn load_self() -> Option<Vec<u8>> {
use str::OwnedStr;
unsafe {
use os::win32::fill_utf16_buf_and_decode;
fill_utf16_buf_and_decode(|buf, sz| {
libc::GetModuleFileNameW(0u as libc::DWORD, buf, sz)
}).map(|s| s.into_string().into_bytes())
}
}
load_self().and_then(Path::new_opt)
}
/// Optionally returns the filesystem path to the current executable which is
/// running.
///
/// Like self_exe_name() but without the binary's name.
///
/// # Example
///
/// ```rust
/// use std::os;
///
/// match os::self_exe_path() {
/// Some(exe_path) => println!("Executable's Path is: {}", exe_path.display()),
/// None => println!("Impossible to fetch the path of this executable.")
/// };
/// ```
pub fn self_exe_path() -> Option<Path> {
self_exe_name().map(|mut p| { p.pop(); p })
}
/// Optionally returns the path to the current user's home directory if known.
///
/// # Unix
///
/// Returns the value of the 'HOME' environment variable if it is set
/// and not equal to the empty string.
///
/// # Windows
///
/// Returns the value of the 'HOME' environment variable if it is
/// set and not equal to the empty string. Otherwise, returns the value of the
/// 'USERPROFILE' environment variable if it is set and not equal to the empty
/// string.
///
/// # Example
///
/// ```rust
/// use std::os;
///
/// match os::homedir() {
/// Some(ref p) => println!("{}", p.display()),
/// None => println!("Impossible to get your home dir!")
/// }
/// ```
pub fn homedir() -> Option<Path> {
#[inline]
#[cfg(unix)]
fn _homedir() -> Option<Path> {
aux_homedir("HOME")
}
#[inline]
#[cfg(windows)]
fn _homedir() -> Option<Path> {
aux_homedir("HOME").or(aux_homedir("USERPROFILE"))
}
#[inline]
fn aux_homedir(home_name: &str) -> Option<Path> {
match getenv_as_bytes(home_name) {
Some(p) => {
if p.is_empty() { None } else { Path::new_opt(p) }
},
_ => None
}
}
_homedir()
}
/**
* Returns the path to a temporary directory.
*
* On Unix, returns the value of the 'TMPDIR' environment variable if it is
* set, otherwise for non-Android it returns '/tmp'. If Android, since there
* is no global temporary folder (it is usually allocated per-app), we return
* '/data/local/tmp'.
*
* On Windows, returns the value of, in order, the 'TMP', 'TEMP',
* 'USERPROFILE' environment variable if any are set and not the empty
* string. Otherwise, tmpdir returns the path to the Windows directory.
*/
pub fn tmpdir() -> Path {
return lookup();
fn getenv_nonempty(v: &str) -> Option<Path> {
match getenv(v) {
Some(x) =>
if x.is_empty() {
None
} else {
Path::new_opt(x)
},
_ => None
}
}
#[cfg(unix)]
fn lookup() -> Path {
let default = if cfg!(target_os = "android") {
Path::new("/data/local/tmp")
} else {
Path::new("/tmp")
};
getenv_nonempty("TMPDIR").unwrap_or(default)
}
#[cfg(windows)]
fn lookup() -> Path {
getenv_nonempty("TMP").or(
getenv_nonempty("TEMP").or(
getenv_nonempty("USERPROFILE").or(
getenv_nonempty("WINDIR")))).unwrap_or(Path::new("C:\\Windows"))
}
}
///
/// Convert a relative path to an absolute path
///
/// If the given path is relative, return it prepended with the current working
/// directory. If the given path is already an absolute path, return it
/// as is.
///
/// # Example
/// ```rust
/// use std::os;
/// use std::path::Path;
///
/// // Assume we're in a path like /home/someuser
/// let rel_path = Path::new("..");
/// let abs_path = os::make_absolute(&rel_path);
/// println!("The absolute path is {}", abs_path.display());
/// // Prints "The absolute path is /home"
/// ```
// NB: this is here rather than in path because it is a form of environment
// querying; what it does depends on the process working directory, not just
// the input paths.
pub fn make_absolute(p: &Path) -> Path {
if p.is_absolute() {
p.clone()
} else {
let mut ret = getcwd();
ret.push(p);
ret
}
}
/// Changes the current working directory to the specified path, returning
/// whether the change was completed successfully or not.
///
/// # Example
/// ```rust
/// use std::os;
/// use std::path::Path;
///
/// let root = Path::new("/");
/// assert!(os::change_dir(&root));
/// println!("Succesfully changed working directory to {}!", root.display());
/// ```
pub fn change_dir(p: &Path) -> bool {
return chdir(p);
#[cfg(windows)]
fn chdir(p: &Path) -> bool {
let p = match p.as_str() {
Some(s) => s.utf16_units().collect::<Vec<u16>>().append_one(0),
None => return false,
};
unsafe {
libc::SetCurrentDirectoryW(p.as_ptr()) != (0 as libc::BOOL)
}
}
#[cfg(unix)]
fn chdir(p: &Path) -> bool {
p.with_c_str(|buf| {
unsafe {
libc::chdir(buf) == (0 as c_int)
}
})
}
}
#[cfg(unix)]
/// Returns the platform-specific value of errno
pub fn errno() -> int {
#[cfg(target_os = "macos")]
#[cfg(target_os = "ios")]
#[cfg(target_os = "freebsd")]
fn errno_location() -> *const c_int {
extern {
fn __error() -> *const c_int;
}
unsafe {
__error()
}
}
#[cfg(target_os = "linux")]
#[cfg(target_os = "android")]
fn errno_location() -> *const c_int {
extern {
fn __errno_location() -> *const c_int;
}
unsafe {
__errno_location()
}
}
unsafe {
(*errno_location()) as int
}
}
#[cfg(windows)]
/// Returns the platform-specific value of errno
pub fn errno() -> uint {
use libc::types::os::arch::extra::DWORD;
#[link_name = "kernel32"]
extern "system" {
fn GetLastError() -> DWORD;
}
unsafe {
GetLastError() as uint
}
}
/// Return the string corresponding to an `errno()` value of `errnum`.
/// # Example
/// ```rust
/// use std::os;
///
/// // Same as println!("{}", last_os_error());
/// println!("{}", os::error_string(os::errno() as uint));
/// ```
pub fn error_string(errnum: uint) -> String {
return strerror(errnum);
#[cfg(unix)]
fn strerror(errnum: uint) -> String {
#[cfg(target_os = "macos")]
#[cfg(target_os = "ios")]
#[cfg(target_os = "android")]
#[cfg(target_os = "freebsd")]
fn strerror_r(errnum: c_int, buf: *mut c_char, buflen: libc::size_t)
-> c_int {
extern {
fn strerror_r(errnum: c_int, buf: *mut c_char,
buflen: libc::size_t) -> c_int;
}
unsafe {
strerror_r(errnum, buf, buflen)
}
}
// GNU libc provides a non-compliant version of strerror_r by default
// and requires macros to instead use the POSIX compliant variant.
// So we just use __xpg_strerror_r which is always POSIX compliant
#[cfg(target_os = "linux")]
fn strerror_r(errnum: c_int, buf: *mut c_char,
buflen: libc::size_t) -> c_int {
extern {
fn __xpg_strerror_r(errnum: c_int,
buf: *mut c_char,
buflen: libc::size_t)
-> c_int;
}
unsafe {
__xpg_strerror_r(errnum, buf, buflen)
}
}
let mut buf = [0 as c_char, ..TMPBUF_SZ];
let p = buf.as_mut_ptr();