LLVM  3.7.0
Unix/Path.inc
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1 //===- llvm/Support/Unix/Path.inc - Unix Path Implementation ----*- C++ -*-===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file implements the Unix specific implementation of the Path API.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 //===----------------------------------------------------------------------===//
15 //=== WARNING: Implementation here must contain only generic UNIX code that
16 //=== is guaranteed to work on *all* UNIX variants.
17 //===----------------------------------------------------------------------===//
18 
19 #include "Unix.h"
20 #include <limits.h>
21 #include <stdio.h>
22 #if HAVE_SYS_STAT_H
23 #include <sys/stat.h>
24 #endif
25 #if HAVE_FCNTL_H
26 #include <fcntl.h>
27 #endif
28 #ifdef HAVE_SYS_MMAN_H
29 #include <sys/mman.h>
30 #endif
31 #if HAVE_DIRENT_H
32 # include <dirent.h>
33 # define NAMLEN(dirent) strlen((dirent)->d_name)
34 #else
35 # define dirent direct
36 # define NAMLEN(dirent) (dirent)->d_namlen
37 # if HAVE_SYS_NDIR_H
38 # include <sys/ndir.h>
39 # endif
40 # if HAVE_SYS_DIR_H
41 # include <sys/dir.h>
42 # endif
43 # if HAVE_NDIR_H
44 # include <ndir.h>
45 # endif
46 #endif
47 
48 #ifdef __APPLE__
49 #include <mach-o/dyld.h>
50 #endif
51 
52 // Both stdio.h and cstdio are included via different pathes and
53 // stdcxx's cstdio doesn't include stdio.h, so it doesn't #undef the macros
54 // either.
55 #undef ferror
56 #undef feof
57 
58 // For GNU Hurd
59 #if defined(__GNU__) && !defined(PATH_MAX)
60 # define PATH_MAX 4096
61 #endif
62 
63 using namespace llvm;
64 
65 namespace llvm {
66 namespace sys {
67 namespace fs {
68 #if defined(__FreeBSD__) || defined (__NetBSD__) || defined(__Bitrig__) || \
69  defined(__OpenBSD__) || defined(__minix) || defined(__FreeBSD_kernel__) || \
70  defined(__linux__) || defined(__CYGWIN__) || defined(__DragonFly__)
71 static int
72 test_dir(char ret[PATH_MAX], const char *dir, const char *bin)
73 {
74  struct stat sb;
75  char fullpath[PATH_MAX];
76 
77  snprintf(fullpath, PATH_MAX, "%s/%s", dir, bin);
78  if (realpath(fullpath, ret) == NULL)
79  return (1);
80  if (stat(fullpath, &sb) != 0)
81  return (1);
82 
83  return (0);
84 }
85 
86 static char *
87 getprogpath(char ret[PATH_MAX], const char *bin)
88 {
89  char *pv, *s, *t;
90 
91  /* First approach: absolute path. */
92  if (bin[0] == '/') {
93  if (test_dir(ret, "/", bin) == 0)
94  return (ret);
95  return (NULL);
96  }
97 
98  /* Second approach: relative path. */
99  if (strchr(bin, '/') != NULL) {
100  char cwd[PATH_MAX];
101  if (getcwd(cwd, PATH_MAX) == NULL)
102  return (NULL);
103  if (test_dir(ret, cwd, bin) == 0)
104  return (ret);
105  return (NULL);
106  }
107 
108  /* Third approach: $PATH */
109  if ((pv = getenv("PATH")) == NULL)
110  return (NULL);
111  s = pv = strdup(pv);
112  if (pv == NULL)
113  return (NULL);
114  while ((t = strsep(&s, ":")) != NULL) {
115  if (test_dir(ret, t, bin) == 0) {
116  free(pv);
117  return (ret);
118  }
119  }
120  free(pv);
121  return (NULL);
122 }
123 #endif // __FreeBSD__ || __NetBSD__ || __FreeBSD_kernel__
124 
125 /// GetMainExecutable - Return the path to the main executable, given the
126 /// value of argv[0] from program startup.
127 std::string getMainExecutable(const char *argv0, void *MainAddr) {
128 #if defined(__APPLE__)
129  // On OS X the executable path is saved to the stack by dyld. Reading it
130  // from there is much faster than calling dladdr, especially for large
131  // binaries with symbols.
132  char exe_path[MAXPATHLEN];
133  uint32_t size = sizeof(exe_path);
134  if (_NSGetExecutablePath(exe_path, &size) == 0) {
135  char link_path[MAXPATHLEN];
136  if (realpath(exe_path, link_path))
137  return link_path;
138  }
139 #elif defined(__FreeBSD__) || defined (__NetBSD__) || defined(__Bitrig__) || \
140  defined(__OpenBSD__) || defined(__minix) || defined(__DragonFly__) || \
141  defined(__FreeBSD_kernel__)
142  char exe_path[PATH_MAX];
143 
144  if (getprogpath(exe_path, argv0) != NULL)
145  return exe_path;
146 #elif defined(__linux__) || defined(__CYGWIN__)
147  char exe_path[MAXPATHLEN];
148  StringRef aPath("/proc/self/exe");
149  if (sys::fs::exists(aPath)) {
150  // /proc is not always mounted under Linux (chroot for example).
151  ssize_t len = readlink(aPath.str().c_str(), exe_path, sizeof(exe_path));
152  if (len >= 0)
153  return std::string(exe_path, len);
154  } else {
155  // Fall back to the classical detection.
156  if (getprogpath(exe_path, argv0) != NULL)
157  return exe_path;
158  }
159 #elif defined(HAVE_DLFCN_H)
160  // Use dladdr to get executable path if available.
161  Dl_info DLInfo;
162  int err = dladdr(MainAddr, &DLInfo);
163  if (err == 0)
164  return "";
165 
166  // If the filename is a symlink, we need to resolve and return the location of
167  // the actual executable.
168  char link_path[MAXPATHLEN];
169  if (realpath(DLInfo.dli_fname, link_path))
170  return link_path;
171 #else
172 #error GetMainExecutable is not implemented on this host yet.
173 #endif
174  return "";
175 }
176 
177 TimeValue file_status::getLastModificationTime() const {
178  TimeValue Ret;
179  Ret.fromEpochTime(fs_st_mtime);
180  return Ret;
181 }
182 
183 UniqueID file_status::getUniqueID() const {
184  return UniqueID(fs_st_dev, fs_st_ino);
185 }
186 
187 std::error_code current_path(SmallVectorImpl<char> &result) {
188  result.clear();
189 
190  const char *pwd = ::getenv("PWD");
191  llvm::sys::fs::file_status PWDStatus, DotStatus;
192  if (pwd && llvm::sys::path::is_absolute(pwd) &&
193  !llvm::sys::fs::status(pwd, PWDStatus) &&
194  !llvm::sys::fs::status(".", DotStatus) &&
195  PWDStatus.getUniqueID() == DotStatus.getUniqueID()) {
196  result.append(pwd, pwd + strlen(pwd));
197  return std::error_code();
198  }
199 
200 #ifdef MAXPATHLEN
201  result.reserve(MAXPATHLEN);
202 #else
203 // For GNU Hurd
204  result.reserve(1024);
205 #endif
206 
207  while (true) {
208  if (::getcwd(result.data(), result.capacity()) == nullptr) {
209  // See if there was a real error.
210  if (errno != ENOMEM)
211  return std::error_code(errno, std::generic_category());
212  // Otherwise there just wasn't enough space.
213  result.reserve(result.capacity() * 2);
214  } else
215  break;
216  }
217 
218  result.set_size(strlen(result.data()));
219  return std::error_code();
220 }
221 
222 std::error_code create_directory(const Twine &path, bool IgnoreExisting) {
223  SmallString<128> path_storage;
224  StringRef p = path.toNullTerminatedStringRef(path_storage);
225 
226  if (::mkdir(p.begin(), S_IRWXU | S_IRWXG) == -1) {
227  if (errno != EEXIST || !IgnoreExisting)
228  return std::error_code(errno, std::generic_category());
229  }
230 
231  return std::error_code();
232 }
233 
234 // Note that we are using symbolic link because hard links are not supported by
235 // all filesystems (SMB doesn't).
236 std::error_code create_link(const Twine &to, const Twine &from) {
237  // Get arguments.
238  SmallString<128> from_storage;
239  SmallString<128> to_storage;
240  StringRef f = from.toNullTerminatedStringRef(from_storage);
241  StringRef t = to.toNullTerminatedStringRef(to_storage);
242 
243  if (::symlink(t.begin(), f.begin()) == -1)
244  return std::error_code(errno, std::generic_category());
245 
246  return std::error_code();
247 }
248 
249 std::error_code remove(const Twine &path, bool IgnoreNonExisting) {
250  SmallString<128> path_storage;
251  StringRef p = path.toNullTerminatedStringRef(path_storage);
252 
253  struct stat buf;
254  if (lstat(p.begin(), &buf) != 0) {
255  if (errno != ENOENT || !IgnoreNonExisting)
256  return std::error_code(errno, std::generic_category());
257  return std::error_code();
258  }
259 
260  // Note: this check catches strange situations. In all cases, LLVM should
261  // only be involved in the creation and deletion of regular files. This
262  // check ensures that what we're trying to erase is a regular file. It
263  // effectively prevents LLVM from erasing things like /dev/null, any block
264  // special file, or other things that aren't "regular" files.
265  if (!S_ISREG(buf.st_mode) && !S_ISDIR(buf.st_mode) && !S_ISLNK(buf.st_mode))
267 
268  if (::remove(p.begin()) == -1) {
269  if (errno != ENOENT || !IgnoreNonExisting)
270  return std::error_code(errno, std::generic_category());
271  }
272 
273  return std::error_code();
274 }
275 
276 std::error_code rename(const Twine &from, const Twine &to) {
277  // Get arguments.
278  SmallString<128> from_storage;
279  SmallString<128> to_storage;
280  StringRef f = from.toNullTerminatedStringRef(from_storage);
281  StringRef t = to.toNullTerminatedStringRef(to_storage);
282 
283  if (::rename(f.begin(), t.begin()) == -1)
284  return std::error_code(errno, std::generic_category());
285 
286  return std::error_code();
287 }
288 
289 std::error_code resize_file(int FD, uint64_t Size) {
290  if (::ftruncate(FD, Size) == -1)
291  return std::error_code(errno, std::generic_category());
292 
293  return std::error_code();
294 }
295 
296 static int convertAccessMode(AccessMode Mode) {
297  switch (Mode) {
298  case AccessMode::Exist:
299  return F_OK;
300  case AccessMode::Write:
301  return W_OK;
302  case AccessMode::Execute:
303  return R_OK | X_OK; // scripts also need R_OK.
304  }
305  llvm_unreachable("invalid enum");
306 }
307 
308 std::error_code access(const Twine &Path, AccessMode Mode) {
309  SmallString<128> PathStorage;
310  StringRef P = Path.toNullTerminatedStringRef(PathStorage);
311 
312  if (::access(P.begin(), convertAccessMode(Mode)) == -1)
313  return std::error_code(errno, std::generic_category());
314 
315  if (Mode == AccessMode::Execute) {
316  // Don't say that directories are executable.
317  struct stat buf;
318  if (0 != stat(P.begin(), &buf))
320  if (!S_ISREG(buf.st_mode))
322  }
323 
324  return std::error_code();
325 }
326 
327 bool equivalent(file_status A, file_status B) {
328  assert(status_known(A) && status_known(B));
329  return A.fs_st_dev == B.fs_st_dev &&
330  A.fs_st_ino == B.fs_st_ino;
331 }
332 
333 std::error_code equivalent(const Twine &A, const Twine &B, bool &result) {
334  file_status fsA, fsB;
335  if (std::error_code ec = status(A, fsA))
336  return ec;
337  if (std::error_code ec = status(B, fsB))
338  return ec;
339  result = equivalent(fsA, fsB);
340  return std::error_code();
341 }
342 
343 static std::error_code fillStatus(int StatRet, const struct stat &Status,
344  file_status &Result) {
345  if (StatRet != 0) {
346  std::error_code ec(errno, std::generic_category());
348  Result = file_status(file_type::file_not_found);
349  else
350  Result = file_status(file_type::status_error);
351  return ec;
352  }
353 
355 
356  if (S_ISDIR(Status.st_mode))
358  else if (S_ISREG(Status.st_mode))
360  else if (S_ISBLK(Status.st_mode))
361  Type = file_type::block_file;
362  else if (S_ISCHR(Status.st_mode))
364  else if (S_ISFIFO(Status.st_mode))
365  Type = file_type::fifo_file;
366  else if (S_ISSOCK(Status.st_mode))
367  Type = file_type::socket_file;
368 
369  perms Perms = static_cast<perms>(Status.st_mode);
370  Result =
371  file_status(Type, Perms, Status.st_dev, Status.st_ino, Status.st_mtime,
372  Status.st_uid, Status.st_gid, Status.st_size);
373 
374  return std::error_code();
375 }
376 
377 std::error_code status(const Twine &Path, file_status &Result) {
378  SmallString<128> PathStorage;
379  StringRef P = Path.toNullTerminatedStringRef(PathStorage);
380 
381  struct stat Status;
382  int StatRet = ::stat(P.begin(), &Status);
383  return fillStatus(StatRet, Status, Result);
384 }
385 
386 std::error_code status(int FD, file_status &Result) {
387  struct stat Status;
388  int StatRet = ::fstat(FD, &Status);
389  return fillStatus(StatRet, Status, Result);
390 }
391 
392 std::error_code setLastModificationAndAccessTime(int FD, TimeValue Time) {
393 #if defined(HAVE_FUTIMENS)
394  timespec Times[2];
395  Times[0].tv_sec = Time.toEpochTime();
396  Times[0].tv_nsec = 0;
397  Times[1] = Times[0];
398  if (::futimens(FD, Times))
399  return std::error_code(errno, std::generic_category());
400  return std::error_code();
401 #elif defined(HAVE_FUTIMES)
402  timeval Times[2];
403  Times[0].tv_sec = Time.toEpochTime();
404  Times[0].tv_usec = 0;
405  Times[1] = Times[0];
406  if (::futimes(FD, Times))
407  return std::error_code(errno, std::generic_category());
408  return std::error_code();
409 #else
410 #warning Missing futimes() and futimens()
412 #endif
413 }
414 
415 std::error_code mapped_file_region::init(int FD, uint64_t Offset,
416  mapmode Mode) {
417  assert(Size != 0);
418 
419  int flags = (Mode == readwrite) ? MAP_SHARED : MAP_PRIVATE;
420  int prot = (Mode == readonly) ? PROT_READ : (PROT_READ | PROT_WRITE);
421  Mapping = ::mmap(nullptr, Size, prot, flags, FD, Offset);
422  if (Mapping == MAP_FAILED)
423  return std::error_code(errno, std::generic_category());
424  return std::error_code();
425 }
426 
427 mapped_file_region::mapped_file_region(int fd, mapmode mode, uint64_t length,
428  uint64_t offset, std::error_code &ec)
429  : Size(length), Mapping() {
430  // Make sure that the requested size fits within SIZE_T.
431  if (length > std::numeric_limits<size_t>::max()) {
433  return;
434  }
435 
436  ec = init(fd, offset, mode);
437  if (ec)
438  Mapping = nullptr;
439 }
440 
441 mapped_file_region::~mapped_file_region() {
442  if (Mapping)
443  ::munmap(Mapping, Size);
444 }
445 
446 uint64_t mapped_file_region::size() const {
447  assert(Mapping && "Mapping failed but used anyway!");
448  return Size;
449 }
450 
451 char *mapped_file_region::data() const {
452  assert(Mapping && "Mapping failed but used anyway!");
453  return reinterpret_cast<char*>(Mapping);
454 }
455 
456 const char *mapped_file_region::const_data() const {
457  assert(Mapping && "Mapping failed but used anyway!");
458  return reinterpret_cast<const char*>(Mapping);
459 }
460 
461 int mapped_file_region::alignment() {
462  return Process::getPageSize();
463 }
464 
465 std::error_code detail::directory_iterator_construct(detail::DirIterState &it,
466  StringRef path){
467  SmallString<128> path_null(path);
468  DIR *directory = ::opendir(path_null.c_str());
469  if (!directory)
470  return std::error_code(errno, std::generic_category());
471 
472  it.IterationHandle = reinterpret_cast<intptr_t>(directory);
473  // Add something for replace_filename to replace.
474  path::append(path_null, ".");
475  it.CurrentEntry = directory_entry(path_null.str());
476  return directory_iterator_increment(it);
477 }
478 
479 std::error_code detail::directory_iterator_destruct(detail::DirIterState &it) {
480  if (it.IterationHandle)
481  ::closedir(reinterpret_cast<DIR *>(it.IterationHandle));
482  it.IterationHandle = 0;
483  it.CurrentEntry = directory_entry();
484  return std::error_code();
485 }
486 
487 std::error_code detail::directory_iterator_increment(detail::DirIterState &it) {
488  errno = 0;
489  dirent *cur_dir = ::readdir(reinterpret_cast<DIR *>(it.IterationHandle));
490  if (cur_dir == nullptr && errno != 0) {
491  return std::error_code(errno, std::generic_category());
492  } else if (cur_dir != nullptr) {
493  StringRef name(cur_dir->d_name, NAMLEN(cur_dir));
494  if ((name.size() == 1 && name[0] == '.') ||
495  (name.size() == 2 && name[0] == '.' && name[1] == '.'))
496  return directory_iterator_increment(it);
497  it.CurrentEntry.replace_filename(name);
498  } else
499  return directory_iterator_destruct(it);
500 
501  return std::error_code();
502 }
503 
504 std::error_code openFileForRead(const Twine &Name, int &ResultFD) {
505  SmallString<128> Storage;
506  StringRef P = Name.toNullTerminatedStringRef(Storage);
507  while ((ResultFD = open(P.begin(), O_RDONLY)) < 0) {
508  if (errno != EINTR)
509  return std::error_code(errno, std::generic_category());
510  }
511  return std::error_code();
512 }
513 
514 std::error_code openFileForWrite(const Twine &Name, int &ResultFD,
515  sys::fs::OpenFlags Flags, unsigned Mode) {
516  // Verify that we don't have both "append" and "excl".
517  assert((!(Flags & sys::fs::F_Excl) || !(Flags & sys::fs::F_Append)) &&
518  "Cannot specify both 'excl' and 'append' file creation flags!");
519 
520  int OpenFlags = O_CREAT;
521 
522  if (Flags & F_RW)
523  OpenFlags |= O_RDWR;
524  else
525  OpenFlags |= O_WRONLY;
526 
527  if (Flags & F_Append)
528  OpenFlags |= O_APPEND;
529  else
530  OpenFlags |= O_TRUNC;
531 
532  if (Flags & F_Excl)
533  OpenFlags |= O_EXCL;
534 
535  SmallString<128> Storage;
536  StringRef P = Name.toNullTerminatedStringRef(Storage);
537  while ((ResultFD = open(P.begin(), OpenFlags, Mode)) < 0) {
538  if (errno != EINTR)
539  return std::error_code(errno, std::generic_category());
540  }
541  return std::error_code();
542 }
543 
544 } // end namespace fs
545 
546 namespace path {
547 
549  if (char *RequestedDir = getenv("HOME")) {
550  result.clear();
551  result.append(RequestedDir, RequestedDir + strlen(RequestedDir));
552  return true;
553  }
554 
555  return false;
556 }
557 
558 static const char *getEnvTempDir() {
559  // Check whether the temporary directory is specified by an environment
560  // variable.
561  const char *EnvironmentVariables[] = {"TMPDIR", "TMP", "TEMP", "TEMPDIR"};
562  for (const char *Env : EnvironmentVariables) {
563  if (const char *Dir = std::getenv(Env))
564  return Dir;
565  }
566 
567  return nullptr;
568 }
569 
570 static const char *getDefaultTempDir(bool ErasedOnReboot) {
571 #ifdef P_tmpdir
572  if ((bool)P_tmpdir)
573  return P_tmpdir;
574 #endif
575 
576  if (ErasedOnReboot)
577  return "/tmp";
578  return "/var/tmp";
579 }
580 
581 void system_temp_directory(bool ErasedOnReboot, SmallVectorImpl<char> &Result) {
582  Result.clear();
583 
584  if (ErasedOnReboot) {
585  // There is no env variable for the cache directory.
586  if (const char *RequestedDir = getEnvTempDir()) {
587  Result.append(RequestedDir, RequestedDir + strlen(RequestedDir));
588  return;
589  }
590  }
591 
592 #if defined(_CS_DARWIN_USER_TEMP_DIR) && defined(_CS_DARWIN_USER_CACHE_DIR)
593  // On Darwin, use DARWIN_USER_TEMP_DIR or DARWIN_USER_CACHE_DIR.
594  // macros defined in <unistd.h> on darwin >= 9
595  int ConfName = ErasedOnReboot? _CS_DARWIN_USER_TEMP_DIR
596  : _CS_DARWIN_USER_CACHE_DIR;
597  size_t ConfLen = confstr(ConfName, nullptr, 0);
598  if (ConfLen > 0) {
599  do {
600  Result.resize(ConfLen);
601  ConfLen = confstr(ConfName, Result.data(), Result.size());
602  } while (ConfLen > 0 && ConfLen != Result.size());
603 
604  if (ConfLen > 0) {
605  assert(Result.back() == 0);
606  Result.pop_back();
607  return;
608  }
609 
610  Result.clear();
611  }
612 #endif
613 
614  const char *RequestedDir = getDefaultTempDir(ErasedOnReboot);
615  Result.append(RequestedDir, RequestedDir + strlen(RequestedDir));
616 }
617 
618 } // end namespace path
619 
620 } // end namespace sys
621 } // end namespace llvm
F_Append - When opening a file, if it already exists append to the existing file instead of returning...
Definition: FileSystem.h:588
size_t capacity() const
Return the total number of elements in the currently allocated buffer.
Definition: SmallVector.h:131
F_Excl - When opening a file, this flag makes raw_fd_ostream report an error if the file already exis...
Definition: FileSystem.h:583
UniqueID getUniqueID() const
std::error_code current_path(SmallVectorImpl< char > &result)
Get the current path.
void reserve(size_type N)
Definition: SmallVector.h:401
file_status - Represents the result of a call to stat and friends.
Definition: FileSystem.h:138
bool status_known(file_status s)
Is status available?
Definition: Path.cpp:849
std::error_code directory_iterator_increment(DirIterState &)
void append(SmallVectorImpl< char > &path, const Twine &a, const Twine &b="", const Twine &c="", const Twine &d="")
Append to path.
Definition: Path.cpp:443
Twine - A lightweight data structure for efficiently representing the concatenation of temporary valu...
Definition: Twine.h:79
#define llvm_unreachable(msg)
Marks that the current location is not supposed to be reachable.
Definition: ErrorHandling.h:98
std::error_code make_error_code(BitcodeError E)
Definition: ReaderWriter.h:150
bool is_absolute(const Twine &path)
Is path absolute?
Definition: Path.cpp:650
May access map via data and modify it. Written to path.
Definition: FileSystem.h:635
May only access map via const_data as read only.
Definition: FileSystem.h:634
std::error_code create_directory(const Twine &path, bool IgnoreExisting=true)
Create the directory in path.
std::error_code create_link(const Twine &to, const Twine &from)
Create a link from from to to.
Open the file for read and write.
Definition: FileSystem.h:595
iterator begin() const
Definition: StringRef.h:90
std::string getMainExecutable(const char *argv0, void *MainExecAddr)
Return the path to the main executable, given the value of argv[0] from program startup and the addre...
#define P(N)
initializer< Ty > init(const Ty &Val)
Definition: CommandLine.h:325
The instances of the Type class are immutable: once they are created, they are never changed...
Definition: Type.h:45
std::error_code directory_iterator_construct(DirIterState &, StringRef)
std::error_code resize_file(int FD, uint64_t Size)
Resize path to size.
void append(in_iter in_start, in_iter in_end)
Add the specified range to the end of the SmallVector.
Definition: SmallVector.h:416
std::error_code setLastModificationAndAccessTime(int FD, TimeValue Time)
Set the file modification and access time.
static unsigned getPageSize()
std::error_code rename(const Twine &from, const Twine &to)
Rename from to to.
void set_size(size_type N)
Set the array size to N, which the current array must have enough capacity for.
Definition: SmallVector.h:685
std::error_code directory_iterator_destruct(DirIterState &)
pointer data()
Return a pointer to the vector's buffer, even if empty().
Definition: SmallVector.h:134
file_type
An enumeration for the file system's view of the type.
Definition: FileSystem.h:53
std::error_code openFileForRead(const Twine &Name, int &ResultFD)
void size_t size
void system_temp_directory(bool erasedOnReboot, SmallVectorImpl< char > &result)
Get the typical temporary directory for the system, e.g., "/var/tmp" or "C:/TEMP".
bool equivalent(file_status A, file_status B)
Do file_status's represent the same thing?
StringRef toNullTerminatedStringRef(SmallVectorImpl< char > &Out) const
This returns the twine as a single null terminated StringRef if it can be represented as such...
Definition: Twine.cpp:31
static const char * name
TimeValue getLastModificationTime() const
bool home_directory(SmallVectorImpl< char > &result)
Get the user's home directory.
std::error_code access(const Twine &Path, AccessMode Mode)
Can the file be accessed?
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:40
std::error_code status(const Twine &path, file_status &result)
Get file status as if by POSIX stat().
bool exists(file_status status)
Does file exist?
Definition: Path.cpp:845
void resize(size_type N)
Definition: SmallVector.h:376
std::error_code openFileForWrite(const Twine &Name, int &ResultFD, OpenFlags Flags, unsigned Mode=0666)