llvm.org GIT mirror llvm / 1b27914 lib / Support / Unix / Path.inc
1b27914

Tree @1b27914 (Download .tar.gz)

Path.inc @1b27914raw · history · blame

  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
//===- llvm/Support/Unix/Path.inc - Unix Path Implementation ----*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the Unix specific implementation of the Path API.
//
//===----------------------------------------------------------------------===//

//===----------------------------------------------------------------------===//
//=== WARNING: Implementation here must contain only generic UNIX code that
//===          is guaranteed to work on *all* UNIX variants.
//===----------------------------------------------------------------------===//

#include "Unix.h"
#include <limits.h>
#include <stdio.h>
#if HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#if HAVE_FCNTL_H
#include <fcntl.h>
#endif
#ifdef HAVE_SYS_MMAN_H
#include <sys/mman.h>
#endif
#if HAVE_DIRENT_H
# include <dirent.h>
# define NAMLEN(dirent) strlen((dirent)->d_name)
#else
# define dirent direct
# define NAMLEN(dirent) (dirent)->d_namlen
# if HAVE_SYS_NDIR_H
#  include <sys/ndir.h>
# endif
# if HAVE_SYS_DIR_H
#  include <sys/dir.h>
# endif
# if HAVE_NDIR_H
#  include <ndir.h>
# endif
#endif

#ifdef __APPLE__
#include <mach-o/dyld.h>
#endif

// Both stdio.h and cstdio are included via different pathes and
// stdcxx's cstdio doesn't include stdio.h, so it doesn't #undef the macros
// either.
#undef ferror
#undef feof

// For GNU Hurd
#if defined(__GNU__) && !defined(PATH_MAX)
# define PATH_MAX 4096
#endif

using namespace llvm;

namespace llvm {
namespace sys  {
namespace fs {
#if defined(__FreeBSD__) || defined (__NetBSD__) || defined(__Bitrig__) || \
    defined(__OpenBSD__) || defined(__minix) || defined(__FreeBSD_kernel__) || \
    defined(__linux__) || defined(__CYGWIN__) || defined(__DragonFly__)
static int
test_dir(char ret[PATH_MAX], const char *dir, const char *bin)
{  
  struct stat sb;
  char fullpath[PATH_MAX];

  snprintf(fullpath, PATH_MAX, "%s/%s", dir, bin);
  if (realpath(fullpath, ret) == NULL)
    return (1);
  if (stat(fullpath, &sb) != 0)
    return (1);

  return (0);
}

static char *
getprogpath(char ret[PATH_MAX], const char *bin)
{
  char *pv, *s, *t;

  /* First approach: absolute path. */
  if (bin[0] == '/') {
    if (test_dir(ret, "/", bin) == 0)
      return (ret);
    return (NULL);
  }

  /* Second approach: relative path. */
  if (strchr(bin, '/') != NULL) {
    char cwd[PATH_MAX];
    if (getcwd(cwd, PATH_MAX) == NULL)
      return (NULL);
    if (test_dir(ret, cwd, bin) == 0)
      return (ret);
    return (NULL);
  }

  /* Third approach: $PATH */
  if ((pv = getenv("PATH")) == NULL)
    return (NULL);
  s = pv = strdup(pv);
  if (pv == NULL)
    return (NULL);
  while ((t = strsep(&s, ":")) != NULL) {
    if (test_dir(ret, t, bin) == 0) {
      free(pv);
      return (ret);
    }
  }
  free(pv);
  return (NULL);
}
#endif // __FreeBSD__ || __NetBSD__ || __FreeBSD_kernel__

/// GetMainExecutable - Return the path to the main executable, given the
/// value of argv[0] from program startup.
std::string getMainExecutable(const char *argv0, void *MainAddr) {
#if defined(__APPLE__)
  // On OS X the executable path is saved to the stack by dyld. Reading it
  // from there is much faster than calling dladdr, especially for large
  // binaries with symbols.
  char exe_path[MAXPATHLEN];
  uint32_t size = sizeof(exe_path);
  if (_NSGetExecutablePath(exe_path, &size) == 0) {
    char link_path[MAXPATHLEN];
    if (realpath(exe_path, link_path))
      return link_path;
  }
#elif defined(__FreeBSD__) || defined (__NetBSD__) || defined(__Bitrig__) || \
      defined(__OpenBSD__) || defined(__minix) || defined(__DragonFly__) || \
      defined(__FreeBSD_kernel__)
  char exe_path[PATH_MAX];

  if (getprogpath(exe_path, argv0) != NULL)
    return exe_path;
#elif defined(__linux__) || defined(__CYGWIN__)
  char exe_path[MAXPATHLEN];
  StringRef aPath("/proc/self/exe");
  if (sys::fs::exists(aPath)) {
      // /proc is not always mounted under Linux (chroot for example).
      ssize_t len = readlink(aPath.str().c_str(), exe_path, sizeof(exe_path));
      if (len >= 0)
          return std::string(exe_path, len);
  } else {
      // Fall back to the classical detection.
      if (getprogpath(exe_path, argv0) != NULL)
          return exe_path;
  }
#elif defined(HAVE_DLFCN_H)
  // Use dladdr to get executable path if available.
  Dl_info DLInfo;
  int err = dladdr(MainAddr, &DLInfo);
  if (err == 0)
    return "";

  // If the filename is a symlink, we need to resolve and return the location of
  // the actual executable.
  char link_path[MAXPATHLEN];
  if (realpath(DLInfo.dli_fname, link_path))
    return link_path;
#else
#error GetMainExecutable is not implemented on this host yet.
#endif
  return "";
}

TimeValue file_status::getLastModificationTime() const {
  TimeValue Ret;
  Ret.fromEpochTime(fs_st_mtime);
  return Ret;
}

UniqueID file_status::getUniqueID() const {
  return UniqueID(fs_st_dev, fs_st_ino);
}

std::error_code current_path(SmallVectorImpl<char> &result) {
  result.clear();

  const char *pwd = ::getenv("PWD");
  llvm::sys::fs::file_status PWDStatus, DotStatus;
  if (pwd && llvm::sys::path::is_absolute(pwd) &&
      !llvm::sys::fs::status(pwd, PWDStatus) &&
      !llvm::sys::fs::status(".", DotStatus) &&
      PWDStatus.getUniqueID() == DotStatus.getUniqueID()) {
    result.append(pwd, pwd + strlen(pwd));
    return std::error_code();
  }

#ifdef MAXPATHLEN
  result.reserve(MAXPATHLEN);
#else
// For GNU Hurd
  result.reserve(1024);
#endif

  while (true) {
    if (::getcwd(result.data(), result.capacity()) == nullptr) {
      // See if there was a real error.
      if (errno != ENOMEM)
        return std::error_code(errno, std::generic_category());
      // Otherwise there just wasn't enough space.
      result.reserve(result.capacity() * 2);
    } else
      break;
  }

  result.set_size(strlen(result.data()));
  return std::error_code();
}

std::error_code create_directory(const Twine &path, bool IgnoreExisting) {
  SmallString<128> path_storage;
  StringRef p = path.toNullTerminatedStringRef(path_storage);

  if (::mkdir(p.begin(), S_IRWXU | S_IRWXG) == -1) {
    if (errno != EEXIST || !IgnoreExisting)
      return std::error_code(errno, std::generic_category());
  }

  return std::error_code();
}

// Note that we are using symbolic link because hard links are not supported by
// all filesystems (SMB doesn't).
std::error_code create_link(const Twine &to, const Twine &from) {
  // Get arguments.
  SmallString<128> from_storage;
  SmallString<128> to_storage;
  StringRef f = from.toNullTerminatedStringRef(from_storage);
  StringRef t = to.toNullTerminatedStringRef(to_storage);

  if (::symlink(t.begin(), f.begin()) == -1)
    return std::error_code(errno, std::generic_category());

  return std::error_code();
}

std::error_code remove(const Twine &path, bool IgnoreNonExisting) {
  SmallString<128> path_storage;
  StringRef p = path.toNullTerminatedStringRef(path_storage);

  struct stat buf;
  if (lstat(p.begin(), &buf) != 0) {
    if (errno != ENOENT || !IgnoreNonExisting)
      return std::error_code(errno, std::generic_category());
    return std::error_code();
  }

  // Note: this check catches strange situations. In all cases, LLVM should
  // only be involved in the creation and deletion of regular files.  This
  // check ensures that what we're trying to erase is a regular file. It
  // effectively prevents LLVM from erasing things like /dev/null, any block
  // special file, or other things that aren't "regular" files.
  if (!S_ISREG(buf.st_mode) && !S_ISDIR(buf.st_mode) && !S_ISLNK(buf.st_mode))
    return make_error_code(errc::operation_not_permitted);

  if (::remove(p.begin()) == -1) {
    if (errno != ENOENT || !IgnoreNonExisting)
      return std::error_code(errno, std::generic_category());
  }

  return std::error_code();
}

std::error_code rename(const Twine &from, const Twine &to) {
  // Get arguments.
  SmallString<128> from_storage;
  SmallString<128> to_storage;
  StringRef f = from.toNullTerminatedStringRef(from_storage);
  StringRef t = to.toNullTerminatedStringRef(to_storage);

  if (::rename(f.begin(), t.begin()) == -1)
    return std::error_code(errno, std::generic_category());

  return std::error_code();
}

std::error_code resize_file(int FD, uint64_t Size) {
  if (::ftruncate(FD, Size) == -1)
    return std::error_code(errno, std::generic_category());

  return std::error_code();
}

static int convertAccessMode(AccessMode Mode) {
  switch (Mode) {
  case AccessMode::Exist:
    return F_OK;
  case AccessMode::Write:
    return W_OK;
  case AccessMode::Execute:
    return R_OK | X_OK; // scripts also need R_OK.
  }
  llvm_unreachable("invalid enum");
}

std::error_code access(const Twine &Path, AccessMode Mode) {
  SmallString<128> PathStorage;
  StringRef P = Path.toNullTerminatedStringRef(PathStorage);

  if (::access(P.begin(), convertAccessMode(Mode)) == -1)
    return std::error_code(errno, std::generic_category());

  if (Mode == AccessMode::Execute) {
    // Don't say that directories are executable.
    struct stat buf;
    if (0 != stat(P.begin(), &buf))
      return errc::permission_denied;
    if (!S_ISREG(buf.st_mode))
      return errc::permission_denied;
  }

  return std::error_code();
}

bool equivalent(file_status A, file_status B) {
  assert(status_known(A) && status_known(B));
  return A.fs_st_dev == B.fs_st_dev &&
         A.fs_st_ino == B.fs_st_ino;
}

std::error_code equivalent(const Twine &A, const Twine &B, bool &result) {
  file_status fsA, fsB;
  if (std::error_code ec = status(A, fsA))
    return ec;
  if (std::error_code ec = status(B, fsB))
    return ec;
  result = equivalent(fsA, fsB);
  return std::error_code();
}

static std::error_code fillStatus(int StatRet, const struct stat &Status,
                             file_status &Result) {
  if (StatRet != 0) {
    std::error_code ec(errno, std::generic_category());
    if (ec == errc::no_such_file_or_directory)
      Result = file_status(file_type::file_not_found);
    else
      Result = file_status(file_type::status_error);
    return ec;
  }

  file_type Type = file_type::type_unknown;

  if (S_ISDIR(Status.st_mode))
    Type = file_type::directory_file;
  else if (S_ISREG(Status.st_mode))
    Type = file_type::regular_file;
  else if (S_ISBLK(Status.st_mode))
    Type = file_type::block_file;
  else if (S_ISCHR(Status.st_mode))
    Type = file_type::character_file;
  else if (S_ISFIFO(Status.st_mode))
    Type = file_type::fifo_file;
  else if (S_ISSOCK(Status.st_mode))
    Type = file_type::socket_file;

  perms Perms = static_cast<perms>(Status.st_mode);
  Result =
      file_status(Type, Perms, Status.st_dev, Status.st_ino, Status.st_mtime,
                  Status.st_uid, Status.st_gid, Status.st_size);

  return std::error_code();
}

std::error_code status(const Twine &Path, file_status &Result) {
  SmallString<128> PathStorage;
  StringRef P = Path.toNullTerminatedStringRef(PathStorage);

  struct stat Status;
  int StatRet = ::stat(P.begin(), &Status);
  return fillStatus(StatRet, Status, Result);
}

std::error_code status(int FD, file_status &Result) {
  struct stat Status;
  int StatRet = ::fstat(FD, &Status);
  return fillStatus(StatRet, Status, Result);
}

std::error_code setLastModificationAndAccessTime(int FD, TimeValue Time) {
#if defined(HAVE_FUTIMENS)
  timespec Times[2];
  Times[0].tv_sec = Time.toEpochTime();
  Times[0].tv_nsec = 0;
  Times[1] = Times[0];
  if (::futimens(FD, Times))
    return std::error_code(errno, std::generic_category());
  return std::error_code();
#elif defined(HAVE_FUTIMES)
  timeval Times[2];
  Times[0].tv_sec = Time.toEpochTime();
  Times[0].tv_usec = 0;
  Times[1] = Times[0];
  if (::futimes(FD, Times))
    return std::error_code(errno, std::generic_category());
  return std::error_code();
#else
#warning Missing futimes() and futimens()
  return make_error_code(errc::function_not_supported);
#endif
}

std::error_code mapped_file_region::init(int FD, uint64_t Offset,
                                         mapmode Mode) {
  assert(Size != 0);

  int flags = (Mode == readwrite) ? MAP_SHARED : MAP_PRIVATE;
  int prot = (Mode == readonly) ? PROT_READ : (PROT_READ | PROT_WRITE);
  Mapping = ::mmap(nullptr, Size, prot, flags, FD, Offset);
  if (Mapping == MAP_FAILED)
    return std::error_code(errno, std::generic_category());
  return std::error_code();
}

mapped_file_region::mapped_file_region(int fd, mapmode mode, uint64_t length,
                                       uint64_t offset, std::error_code &ec)
    : Size(length), Mapping() {
  // Make sure that the requested size fits within SIZE_T.
  if (length > std::numeric_limits<size_t>::max()) {
    ec = make_error_code(errc::invalid_argument);
    return;
  }

  ec = init(fd, offset, mode);
  if (ec)
    Mapping = nullptr;
}

mapped_file_region::~mapped_file_region() {
  if (Mapping)
    ::munmap(Mapping, Size);
}

uint64_t mapped_file_region::size() const {
  assert(Mapping && "Mapping failed but used anyway!");
  return Size;
}

char *mapped_file_region::data() const {
  assert(Mapping && "Mapping failed but used anyway!");
  return reinterpret_cast<char*>(Mapping);
}

const char *mapped_file_region::const_data() const {
  assert(Mapping && "Mapping failed but used anyway!");
  return reinterpret_cast<const char*>(Mapping);
}

int mapped_file_region::alignment() {
  return Process::getPageSize();
}

std::error_code detail::directory_iterator_construct(detail::DirIterState &it,
                                                StringRef path){
  SmallString<128> path_null(path);
  DIR *directory = ::opendir(path_null.c_str());
  if (!directory)
    return std::error_code(errno, std::generic_category());

  it.IterationHandle = reinterpret_cast<intptr_t>(directory);
  // Add something for replace_filename to replace.
  path::append(path_null, ".");
  it.CurrentEntry = directory_entry(path_null.str());
  return directory_iterator_increment(it);
}

std::error_code detail::directory_iterator_destruct(detail::DirIterState &it) {
  if (it.IterationHandle)
    ::closedir(reinterpret_cast<DIR *>(it.IterationHandle));
  it.IterationHandle = 0;
  it.CurrentEntry = directory_entry();
  return std::error_code();
}

std::error_code detail::directory_iterator_increment(detail::DirIterState &it) {
  errno = 0;
  dirent *cur_dir = ::readdir(reinterpret_cast<DIR *>(it.IterationHandle));
  if (cur_dir == nullptr && errno != 0) {
    return std::error_code(errno, std::generic_category());
  } else if (cur_dir != nullptr) {
    StringRef name(cur_dir->d_name, NAMLEN(cur_dir));
    if ((name.size() == 1 && name[0] == '.') ||
        (name.size() == 2 && name[0] == '.' && name[1] == '.'))
      return directory_iterator_increment(it);
    it.CurrentEntry.replace_filename(name);
  } else
    return directory_iterator_destruct(it);

  return std::error_code();
}

std::error_code openFileForRead(const Twine &Name, int &ResultFD) {
  SmallString<128> Storage;
  StringRef P = Name.toNullTerminatedStringRef(Storage);
  while ((ResultFD = open(P.begin(), O_RDONLY)) < 0) {
    if (errno != EINTR)
      return std::error_code(errno, std::generic_category());
  }
  return std::error_code();
}

std::error_code openFileForWrite(const Twine &Name, int &ResultFD,
                            sys::fs::OpenFlags Flags, unsigned Mode) {
  // Verify that we don't have both "append" and "excl".
  assert((!(Flags & sys::fs::F_Excl) || !(Flags & sys::fs::F_Append)) &&
         "Cannot specify both 'excl' and 'append' file creation flags!");

  int OpenFlags = O_CREAT;

  if (Flags & F_RW)
    OpenFlags |= O_RDWR;
  else
    OpenFlags |= O_WRONLY;

  if (Flags & F_Append)
    OpenFlags |= O_APPEND;
  else
    OpenFlags |= O_TRUNC;

  if (Flags & F_Excl)
    OpenFlags |= O_EXCL;

  SmallString<128> Storage;
  StringRef P = Name.toNullTerminatedStringRef(Storage);
  while ((ResultFD = open(P.begin(), OpenFlags, Mode)) < 0) {
    if (errno != EINTR)
      return std::error_code(errno, std::generic_category());
  }
  return std::error_code();
}

} // end namespace fs

namespace path {

bool home_directory(SmallVectorImpl<char> &result) {
  if (char *RequestedDir = getenv("HOME")) {
    result.clear();
    result.append(RequestedDir, RequestedDir + strlen(RequestedDir));
    return true;
  }

  return false;
}

static const char *getEnvTempDir() {
  // Check whether the temporary directory is specified by an environment
  // variable.
  const char *EnvironmentVariables[] = {"TMPDIR", "TMP", "TEMP", "TEMPDIR"};
  for (const char *Env : EnvironmentVariables) {
    if (const char *Dir = std::getenv(Env))
      return Dir;
  }

  return nullptr;
}

static const char *getDefaultTempDir(bool ErasedOnReboot) {
#ifdef P_tmpdir
  if ((bool)P_tmpdir)
    return P_tmpdir;
#endif

  if (ErasedOnReboot)
    return "/tmp";
  return "/var/tmp";
}

void system_temp_directory(bool ErasedOnReboot, SmallVectorImpl<char> &Result) {
  Result.clear();

  if (ErasedOnReboot) {
    // There is no env variable for the cache directory.
    if (const char *RequestedDir = getEnvTempDir()) {
      Result.append(RequestedDir, RequestedDir + strlen(RequestedDir));
      return;
    }
  }

#if defined(_CS_DARWIN_USER_TEMP_DIR) && defined(_CS_DARWIN_USER_CACHE_DIR)
  // On Darwin, use DARWIN_USER_TEMP_DIR or DARWIN_USER_CACHE_DIR.
  // macros defined in <unistd.h> on darwin >= 9
  int ConfName = ErasedOnReboot? _CS_DARWIN_USER_TEMP_DIR
                               : _CS_DARWIN_USER_CACHE_DIR;
  size_t ConfLen = confstr(ConfName, nullptr, 0);
  if (ConfLen > 0) {
    do {
      Result.resize(ConfLen);
      ConfLen = confstr(ConfName, Result.data(), Result.size());
    } while (ConfLen > 0 && ConfLen != Result.size());

    if (ConfLen > 0) {
      assert(Result.back() == 0);
      Result.pop_back();
      return;
    }

    Result.clear();
  }
#endif

  const char *RequestedDir = getDefaultTempDir(ErasedOnReboot);
  Result.append(RequestedDir, RequestedDir + strlen(RequestedDir));
}

} // end namespace path

} // end namespace sys
} // end namespace llvm