1 //===- llvm/Support/Unix/Path.inc - Unix Path Implementation ----*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the Unix specific implementation of the Path API.
12 //===----------------------------------------------------------------------===//
14 //===----------------------------------------------------------------------===//
15 //=== WARNING: Implementation here must contain only generic UNIX code that
16 //=== is guaranteed to work on *all* UNIX variants.
17 //===----------------------------------------------------------------------===//
31 #ifdef HAVE_SYS_MMAN_H
36 # define NAMLEN(dirent) strlen((dirent)->d_name)
38 # define dirent direct
39 # define NAMLEN(dirent) (dirent)->d_namlen
41 # include <sys/ndir.h>
54 #include <mach-o/dyld.h>
58 // Both stdio.h and cstdio are included via different paths and
59 // stdcxx's cstdio doesn't include stdio.h, so it doesn't #undef the macros
65 #if defined(__GNU__) && !defined(PATH_MAX)
66 # define PATH_MAX 4096
69 #include <sys/types.h>
70 #if !defined(__APPLE__) && !defined(__OpenBSD__) && !defined(__FreeBSD__) && \
72 #include <sys/statvfs.h>
73 #define STATVFS statvfs
74 #define FSTATVFS fstatvfs
75 #define STATVFS_F_FRSIZE(vfs) vfs.f_frsize
77 #if defined(__OpenBSD__) || defined(__FreeBSD__)
78 #include <sys/param.h>
79 #include <sys/mount.h>
80 #elif defined(__linux__)
81 #if defined(HAVE_LINUX_MAGIC_H)
82 #include <linux/magic.h>
84 #if defined(HAVE_LINUX_NFS_FS_H)
85 #include <linux/nfs_fs.h>
87 #if defined(HAVE_LINUX_SMB_H)
88 #include <linux/smb.h>
93 #include <sys/mount.h>
95 #define STATVFS statfs
96 #define FSTATVFS fstatfs
97 #define STATVFS_F_FRSIZE(vfs) static_cast<uint64_t>(vfs.f_bsize)
100 #if defined(__NetBSD__)
101 #define STATVFS_F_FLAG(vfs) (vfs).f_flag
103 #define STATVFS_F_FLAG(vfs) (vfs).f_flags
106 using namespace llvm;
111 #if defined(__FreeBSD__) || defined (__NetBSD__) || defined(__Bitrig__) || \
112 defined(__OpenBSD__) || defined(__minix) || defined(__FreeBSD_kernel__) || \
113 defined(__linux__) || defined(__CYGWIN__) || defined(__DragonFly__) || \
116 test_dir(char ret[PATH_MAX], const char *dir, const char *bin)
119 char fullpath[PATH_MAX];
121 snprintf(fullpath, PATH_MAX, "%s/%s", dir, bin);
122 if (!realpath(fullpath, ret))
124 if (stat(fullpath, &sb) != 0)
131 getprogpath(char ret[PATH_MAX], const char *bin)
135 /* First approach: absolute path. */
137 if (test_dir(ret, "/", bin) == 0)
142 /* Second approach: relative path. */
143 if (strchr(bin, '/')) {
145 if (!getcwd(cwd, PATH_MAX))
147 if (test_dir(ret, cwd, bin) == 0)
152 /* Third approach: $PATH */
153 if ((pv = getenv("PATH")) == nullptr)
158 while ((t = strsep(&s, ":")) != nullptr) {
159 if (test_dir(ret, t, bin) == 0) {
167 #endif // __FreeBSD__ || __NetBSD__ || __FreeBSD_kernel__
169 /// GetMainExecutable - Return the path to the main executable, given the
170 /// value of argv[0] from program startup.
171 std::string getMainExecutable(const char *argv0, void *MainAddr) {
172 #if defined(__APPLE__)
173 // On OS X the executable path is saved to the stack by dyld. Reading it
174 // from there is much faster than calling dladdr, especially for large
175 // binaries with symbols.
176 char exe_path[MAXPATHLEN];
177 uint32_t size = sizeof(exe_path);
178 if (_NSGetExecutablePath(exe_path, &size) == 0) {
179 char link_path[MAXPATHLEN];
180 if (realpath(exe_path, link_path))
183 #elif defined(__FreeBSD__) || defined (__NetBSD__) || defined(__Bitrig__) || \
184 defined(__OpenBSD__) || defined(__minix) || defined(__DragonFly__) || \
185 defined(__FreeBSD_kernel__) || defined(_AIX)
186 char exe_path[PATH_MAX];
188 if (getprogpath(exe_path, argv0) != NULL)
190 #elif defined(__linux__) || defined(__CYGWIN__)
191 char exe_path[MAXPATHLEN];
192 StringRef aPath("/proc/self/exe");
193 if (sys::fs::exists(aPath)) {
194 // /proc is not always mounted under Linux (chroot for example).
195 ssize_t len = readlink(aPath.str().c_str(), exe_path, sizeof(exe_path));
197 return std::string(exe_path, len);
199 // Fall back to the classical detection.
200 if (getprogpath(exe_path, argv0))
203 #elif defined(HAVE_DLFCN_H) && defined(HAVE_DLADDR)
204 // Use dladdr to get executable path if available.
206 int err = dladdr(MainAddr, &DLInfo);
210 // If the filename is a symlink, we need to resolve and return the location of
211 // the actual executable.
212 char link_path[MAXPATHLEN];
213 if (realpath(DLInfo.dli_fname, link_path))
216 #error GetMainExecutable is not implemented on this host yet.
221 TimePoint<> file_status::getLastAccessedTime() const {
222 return toTimePoint(fs_st_atime);
225 TimePoint<> file_status::getLastModificationTime() const {
226 return toTimePoint(fs_st_mtime);
229 UniqueID file_status::getUniqueID() const {
230 return UniqueID(fs_st_dev, fs_st_ino);
233 ErrorOr<space_info> disk_space(const Twine &Path) {
235 if (::STATVFS(Path.str().c_str(), &Vfs))
236 return std::error_code(errno, std::generic_category());
237 auto FrSize = STATVFS_F_FRSIZE(Vfs);
238 space_info SpaceInfo;
239 SpaceInfo.capacity = static_cast<uint64_t>(Vfs.f_blocks) * FrSize;
240 SpaceInfo.free = static_cast<uint64_t>(Vfs.f_bfree) * FrSize;
241 SpaceInfo.available = static_cast<uint64_t>(Vfs.f_bavail) * FrSize;
245 std::error_code current_path(SmallVectorImpl<char> &result) {
248 const char *pwd = ::getenv("PWD");
249 llvm::sys::fs::file_status PWDStatus, DotStatus;
250 if (pwd && llvm::sys::path::is_absolute(pwd) &&
251 !llvm::sys::fs::status(pwd, PWDStatus) &&
252 !llvm::sys::fs::status(".", DotStatus) &&
253 PWDStatus.getUniqueID() == DotStatus.getUniqueID()) {
254 result.append(pwd, pwd + strlen(pwd));
255 return std::error_code();
259 result.reserve(MAXPATHLEN);
262 result.reserve(1024);
266 if (::getcwd(result.data(), result.capacity()) == nullptr) {
267 // See if there was a real error.
269 return std::error_code(errno, std::generic_category());
270 // Otherwise there just wasn't enough space.
271 result.reserve(result.capacity() * 2);
276 result.set_size(strlen(result.data()));
277 return std::error_code();
280 std::error_code set_current_path(const Twine &path) {
281 SmallString<128> path_storage;
282 StringRef p = path.toNullTerminatedStringRef(path_storage);
284 if (::chdir(p.begin()) == -1)
285 return std::error_code(errno, std::generic_category());
287 return std::error_code();
290 std::error_code create_directory(const Twine &path, bool IgnoreExisting,
292 SmallString<128> path_storage;
293 StringRef p = path.toNullTerminatedStringRef(path_storage);
295 if (::mkdir(p.begin(), Perms) == -1) {
296 if (errno != EEXIST || !IgnoreExisting)
297 return std::error_code(errno, std::generic_category());
300 return std::error_code();
303 // Note that we are using symbolic link because hard links are not supported by
304 // all filesystems (SMB doesn't).
305 std::error_code create_link(const Twine &to, const Twine &from) {
307 SmallString<128> from_storage;
308 SmallString<128> to_storage;
309 StringRef f = from.toNullTerminatedStringRef(from_storage);
310 StringRef t = to.toNullTerminatedStringRef(to_storage);
312 if (::symlink(t.begin(), f.begin()) == -1)
313 return std::error_code(errno, std::generic_category());
315 return std::error_code();
318 std::error_code create_hard_link(const Twine &to, const Twine &from) {
320 SmallString<128> from_storage;
321 SmallString<128> to_storage;
322 StringRef f = from.toNullTerminatedStringRef(from_storage);
323 StringRef t = to.toNullTerminatedStringRef(to_storage);
325 if (::link(t.begin(), f.begin()) == -1)
326 return std::error_code(errno, std::generic_category());
328 return std::error_code();
331 std::error_code remove(const Twine &path, bool IgnoreNonExisting) {
332 SmallString<128> path_storage;
333 StringRef p = path.toNullTerminatedStringRef(path_storage);
336 if (lstat(p.begin(), &buf) != 0) {
337 if (errno != ENOENT || !IgnoreNonExisting)
338 return std::error_code(errno, std::generic_category());
339 return std::error_code();
342 // Note: this check catches strange situations. In all cases, LLVM should
343 // only be involved in the creation and deletion of regular files. This
344 // check ensures that what we're trying to erase is a regular file. It
345 // effectively prevents LLVM from erasing things like /dev/null, any block
346 // special file, or other things that aren't "regular" files.
347 if (!S_ISREG(buf.st_mode) && !S_ISDIR(buf.st_mode) && !S_ISLNK(buf.st_mode))
348 return make_error_code(errc::operation_not_permitted);
350 if (::remove(p.begin()) == -1) {
351 if (errno != ENOENT || !IgnoreNonExisting)
352 return std::error_code(errno, std::generic_category());
355 return std::error_code();
358 static bool is_local_impl(struct STATVFS &Vfs) {
359 #if defined(__linux__)
360 #ifndef NFS_SUPER_MAGIC
361 #define NFS_SUPER_MAGIC 0x6969
363 #ifndef SMB_SUPER_MAGIC
364 #define SMB_SUPER_MAGIC 0x517B
366 #ifndef CIFS_MAGIC_NUMBER
367 #define CIFS_MAGIC_NUMBER 0xFF534D42
369 switch ((uint32_t)Vfs.f_type) {
370 case NFS_SUPER_MAGIC:
371 case SMB_SUPER_MAGIC:
372 case CIFS_MAGIC_NUMBER:
377 #elif defined(__CYGWIN__)
378 // Cygwin doesn't expose this information; would need to use Win32 API.
381 return !!(STATVFS_F_FLAG(Vfs) & MNT_LOCAL);
385 std::error_code is_local(const Twine &Path, bool &Result) {
387 if (::STATVFS(Path.str().c_str(), &Vfs))
388 return std::error_code(errno, std::generic_category());
390 Result = is_local_impl(Vfs);
391 return std::error_code();
394 std::error_code is_local(int FD, bool &Result) {
396 if (::FSTATVFS(FD, &Vfs))
397 return std::error_code(errno, std::generic_category());
399 Result = is_local_impl(Vfs);
400 return std::error_code();
403 std::error_code rename(const Twine &from, const Twine &to) {
405 SmallString<128> from_storage;
406 SmallString<128> to_storage;
407 StringRef f = from.toNullTerminatedStringRef(from_storage);
408 StringRef t = to.toNullTerminatedStringRef(to_storage);
410 if (::rename(f.begin(), t.begin()) == -1)
411 return std::error_code(errno, std::generic_category());
413 return std::error_code();
416 std::error_code resize_file(int FD, uint64_t Size) {
417 #if defined(HAVE_POSIX_FALLOCATE)
418 // If we have posix_fallocate use it. Unlike ftruncate it always allocates
419 // space, so we get an error if the disk is full.
420 if (int Err = ::posix_fallocate(FD, 0, Size))
421 return std::error_code(Err, std::generic_category());
423 // Use ftruncate as a fallback. It may or may not allocate space. At least on
424 // OS X with HFS+ it does.
425 if (::ftruncate(FD, Size) == -1)
426 return std::error_code(errno, std::generic_category());
429 return std::error_code();
432 static int convertAccessMode(AccessMode Mode) {
434 case AccessMode::Exist:
436 case AccessMode::Write:
438 case AccessMode::Execute:
439 return R_OK | X_OK; // scripts also need R_OK.
441 llvm_unreachable("invalid enum");
444 std::error_code access(const Twine &Path, AccessMode Mode) {
445 SmallString<128> PathStorage;
446 StringRef P = Path.toNullTerminatedStringRef(PathStorage);
448 if (::access(P.begin(), convertAccessMode(Mode)) == -1)
449 return std::error_code(errno, std::generic_category());
451 if (Mode == AccessMode::Execute) {
452 // Don't say that directories are executable.
454 if (0 != stat(P.begin(), &buf))
455 return errc::permission_denied;
456 if (!S_ISREG(buf.st_mode))
457 return errc::permission_denied;
460 return std::error_code();
463 bool can_execute(const Twine &Path) {
464 return !access(Path, AccessMode::Execute);
467 bool equivalent(file_status A, file_status B) {
468 assert(status_known(A) && status_known(B));
469 return A.fs_st_dev == B.fs_st_dev &&
470 A.fs_st_ino == B.fs_st_ino;
473 std::error_code equivalent(const Twine &A, const Twine &B, bool &result) {
474 file_status fsA, fsB;
475 if (std::error_code ec = status(A, fsA))
477 if (std::error_code ec = status(B, fsB))
479 result = equivalent(fsA, fsB);
480 return std::error_code();
483 static void expandTildeExpr(SmallVectorImpl<char> &Path) {
484 StringRef PathStr(Path.begin(), Path.size());
485 if (PathStr.empty() || !PathStr.startswith("~"))
488 PathStr = PathStr.drop_front();
489 StringRef Expr = PathStr.take_until(path::is_separator);
490 StringRef Remainder = PathStr.substr(Expr.size() + 1);
491 SmallString<128> Storage;
493 // This is just ~/..., resolve it to the current user's home dir.
494 if (!path::home_directory(Storage)) {
495 // For some reason we couldn't get the home directory. Just exit.
499 // Overwrite the first character and insert the rest.
500 Path[0] = Storage[0];
501 Path.insert(Path.begin() + 1, Storage.begin() + 1, Storage.end());
505 // This is a string of the form ~username/, look up this user's entry in the
506 // password database.
507 struct passwd *Entry = nullptr;
508 std::string User = Expr.str();
509 Entry = ::getpwnam(User.c_str());
512 // Unable to look up the entry, just return back the original path.
518 Path.append(Entry->pw_dir, Entry->pw_dir + strlen(Entry->pw_dir));
519 llvm::sys::path::append(Path, Storage);
522 static std::error_code fillStatus(int StatRet, const struct stat &Status,
523 file_status &Result) {
525 std::error_code ec(errno, std::generic_category());
526 if (ec == errc::no_such_file_or_directory)
527 Result = file_status(file_type::file_not_found);
529 Result = file_status(file_type::status_error);
533 file_type Type = file_type::type_unknown;
535 if (S_ISDIR(Status.st_mode))
536 Type = file_type::directory_file;
537 else if (S_ISREG(Status.st_mode))
538 Type = file_type::regular_file;
539 else if (S_ISBLK(Status.st_mode))
540 Type = file_type::block_file;
541 else if (S_ISCHR(Status.st_mode))
542 Type = file_type::character_file;
543 else if (S_ISFIFO(Status.st_mode))
544 Type = file_type::fifo_file;
545 else if (S_ISSOCK(Status.st_mode))
546 Type = file_type::socket_file;
547 else if (S_ISLNK(Status.st_mode))
548 Type = file_type::symlink_file;
550 perms Perms = static_cast<perms>(Status.st_mode);
552 file_status(Type, Perms, Status.st_dev, Status.st_ino, Status.st_atime,
553 Status.st_mtime, Status.st_uid, Status.st_gid,
556 return std::error_code();
559 std::error_code status(const Twine &Path, file_status &Result, bool Follow) {
560 SmallString<128> PathStorage;
561 StringRef P = Path.toNullTerminatedStringRef(PathStorage);
564 int StatRet = (Follow ? ::stat : ::lstat)(P.begin(), &Status);
565 return fillStatus(StatRet, Status, Result);
568 std::error_code status(int FD, file_status &Result) {
570 int StatRet = ::fstat(FD, &Status);
571 return fillStatus(StatRet, Status, Result);
574 std::error_code setLastModificationAndAccessTime(int FD, TimePoint<> Time) {
575 #if defined(HAVE_FUTIMENS)
577 Times[0] = Times[1] = sys::toTimeSpec(Time);
578 if (::futimens(FD, Times))
579 return std::error_code(errno, std::generic_category());
580 return std::error_code();
581 #elif defined(HAVE_FUTIMES)
583 Times[0] = Times[1] = sys::toTimeVal(
584 std::chrono::time_point_cast<std::chrono::microseconds>(Time));
585 if (::futimes(FD, Times))
586 return std::error_code(errno, std::generic_category());
587 return std::error_code();
589 #warning Missing futimes() and futimens()
590 return make_error_code(errc::function_not_supported);
594 std::error_code mapped_file_region::init(int FD, uint64_t Offset,
598 int flags = (Mode == readwrite) ? MAP_SHARED : MAP_PRIVATE;
599 int prot = (Mode == readonly) ? PROT_READ : (PROT_READ | PROT_WRITE);
600 #if defined(__APPLE__)
601 //----------------------------------------------------------------------
602 // Newer versions of MacOSX have a flag that will allow us to read from
603 // binaries whose code signature is invalid without crashing by using
604 // the MAP_RESILIENT_CODESIGN flag. Also if a file from removable media
605 // is mapped we can avoid crashing and return zeroes to any pages we try
606 // to read if the media becomes unavailable by using the
607 // MAP_RESILIENT_MEDIA flag. These flags are only usable when mapping
608 // with PROT_READ, so take care not to specify them otherwise.
609 //----------------------------------------------------------------------
610 if (Mode == readonly) {
611 #if defined(MAP_RESILIENT_CODESIGN)
612 flags |= MAP_RESILIENT_CODESIGN;
614 #if defined(MAP_RESILIENT_MEDIA)
615 flags |= MAP_RESILIENT_MEDIA;
618 #endif // #if defined (__APPLE__)
620 Mapping = ::mmap(nullptr, Size, prot, flags, FD, Offset);
621 if (Mapping == MAP_FAILED)
622 return std::error_code(errno, std::generic_category());
623 return std::error_code();
626 mapped_file_region::mapped_file_region(int fd, mapmode mode, uint64_t length,
627 uint64_t offset, std::error_code &ec)
628 : Size(length), Mapping() {
629 // Make sure that the requested size fits within SIZE_T.
630 if (length > std::numeric_limits<size_t>::max()) {
631 ec = make_error_code(errc::invalid_argument);
635 ec = init(fd, offset, mode);
640 mapped_file_region::~mapped_file_region() {
642 ::munmap(Mapping, Size);
645 uint64_t mapped_file_region::size() const {
646 assert(Mapping && "Mapping failed but used anyway!");
650 char *mapped_file_region::data() const {
651 assert(Mapping && "Mapping failed but used anyway!");
652 return reinterpret_cast<char*>(Mapping);
655 const char *mapped_file_region::const_data() const {
656 assert(Mapping && "Mapping failed but used anyway!");
657 return reinterpret_cast<const char*>(Mapping);
660 int mapped_file_region::alignment() {
661 return Process::getPageSize();
664 std::error_code detail::directory_iterator_construct(detail::DirIterState &it,
666 bool follow_symlinks) {
667 SmallString<128> path_null(path);
668 DIR *directory = ::opendir(path_null.c_str());
670 return std::error_code(errno, std::generic_category());
672 it.IterationHandle = reinterpret_cast<intptr_t>(directory);
673 // Add something for replace_filename to replace.
674 path::append(path_null, ".");
675 it.CurrentEntry = directory_entry(path_null.str(), follow_symlinks);
676 return directory_iterator_increment(it);
679 std::error_code detail::directory_iterator_destruct(detail::DirIterState &it) {
680 if (it.IterationHandle)
681 ::closedir(reinterpret_cast<DIR *>(it.IterationHandle));
682 it.IterationHandle = 0;
683 it.CurrentEntry = directory_entry();
684 return std::error_code();
687 std::error_code detail::directory_iterator_increment(detail::DirIterState &it) {
689 dirent *cur_dir = ::readdir(reinterpret_cast<DIR *>(it.IterationHandle));
690 if (cur_dir == nullptr && errno != 0) {
691 return std::error_code(errno, std::generic_category());
692 } else if (cur_dir != nullptr) {
693 StringRef name(cur_dir->d_name, NAMLEN(cur_dir));
694 if ((name.size() == 1 && name[0] == '.') ||
695 (name.size() == 2 && name[0] == '.' && name[1] == '.'))
696 return directory_iterator_increment(it);
697 it.CurrentEntry.replace_filename(name);
699 return directory_iterator_destruct(it);
701 return std::error_code();
704 #if !defined(F_GETPATH)
705 static bool hasProcSelfFD() {
706 // If we have a /proc filesystem mounted, we can quickly establish the
707 // real name of the file with readlink
708 static const bool Result = (::access("/proc/self/fd", R_OK) == 0);
713 std::error_code openFileForRead(const Twine &Name, int &ResultFD,
714 SmallVectorImpl<char> *RealPath) {
715 SmallString<128> Storage;
716 StringRef P = Name.toNullTerminatedStringRef(Storage);
717 int OpenFlags = O_RDONLY;
719 OpenFlags |= O_CLOEXEC;
721 while ((ResultFD = open(P.begin(), OpenFlags)) < 0) {
723 return std::error_code(errno, std::generic_category());
726 int r = fcntl(ResultFD, F_SETFD, FD_CLOEXEC);
728 assert(r == 0 && "fcntl(F_SETFD, FD_CLOEXEC) failed");
730 // Attempt to get the real name of the file, if the user asked
732 return std::error_code();
734 #if defined(F_GETPATH)
735 // When F_GETPATH is availble, it is the quickest way to get
736 // the real path name.
737 char Buffer[MAXPATHLEN];
738 if (::fcntl(ResultFD, F_GETPATH, Buffer) != -1)
739 RealPath->append(Buffer, Buffer + strlen(Buffer));
741 char Buffer[PATH_MAX];
742 if (hasProcSelfFD()) {
744 snprintf(ProcPath, sizeof(ProcPath), "/proc/self/fd/%d", ResultFD);
745 ssize_t CharCount = ::readlink(ProcPath, Buffer, sizeof(Buffer));
747 RealPath->append(Buffer, Buffer + CharCount);
749 // Use ::realpath to get the real path name
750 if (::realpath(P.begin(), Buffer) != nullptr)
751 RealPath->append(Buffer, Buffer + strlen(Buffer));
754 return std::error_code();
757 std::error_code openFileForWrite(const Twine &Name, int &ResultFD,
758 sys::fs::OpenFlags Flags, unsigned Mode) {
759 // Verify that we don't have both "append" and "excl".
760 assert((!(Flags & sys::fs::F_Excl) || !(Flags & sys::fs::F_Append)) &&
761 "Cannot specify both 'excl' and 'append' file creation flags!");
763 int OpenFlags = O_CREAT;
766 OpenFlags |= O_CLOEXEC;
772 OpenFlags |= O_WRONLY;
774 if (Flags & F_Append)
775 OpenFlags |= O_APPEND;
777 OpenFlags |= O_TRUNC;
782 SmallString<128> Storage;
783 StringRef P = Name.toNullTerminatedStringRef(Storage);
784 while ((ResultFD = open(P.begin(), OpenFlags, Mode)) < 0) {
786 return std::error_code(errno, std::generic_category());
789 int r = fcntl(ResultFD, F_SETFD, FD_CLOEXEC);
791 assert(r == 0 && "fcntl(F_SETFD, FD_CLOEXEC) failed");
793 return std::error_code();
796 std::error_code getPathFromOpenFD(int FD, SmallVectorImpl<char> &ResultPath) {
798 return make_error_code(errc::bad_file_descriptor);
800 #if defined(F_GETPATH)
801 // When F_GETPATH is availble, it is the quickest way to get
802 // the path from a file descriptor.
803 ResultPath.reserve(MAXPATHLEN);
804 if (::fcntl(FD, F_GETPATH, ResultPath.begin()) == -1)
805 return std::error_code(errno, std::generic_category());
807 ResultPath.set_size(strlen(ResultPath.begin()));
809 // If we have a /proc filesystem mounted, we can quickly establish the
810 // real name of the file with readlink. Otherwise, we don't know how to
811 // get the filename from a file descriptor. Give up.
812 if (!fs::hasProcSelfFD())
813 return make_error_code(errc::function_not_supported);
815 ResultPath.reserve(PATH_MAX);
817 snprintf(ProcPath, sizeof(ProcPath), "/proc/self/fd/%d", FD);
818 ssize_t CharCount = ::readlink(ProcPath, ResultPath.begin(), ResultPath.capacity());
820 return std::error_code(errno, std::generic_category());
822 // Was the filename truncated?
823 if (static_cast<size_t>(CharCount) == ResultPath.capacity()) {
824 // Use lstat to get the size of the filename
826 if (::lstat(ProcPath, &sb) < 0)
827 return std::error_code(errno, std::generic_category());
829 ResultPath.reserve(sb.st_size + 1);
830 CharCount = ::readlink(ProcPath, ResultPath.begin(), ResultPath.capacity());
832 return std::error_code(errno, std::generic_category());
834 // Test for race condition: did the link size change?
835 if (CharCount > sb.st_size)
836 return std::error_code(ENAMETOOLONG, std::generic_category());
838 ResultPath.set_size(static_cast<size_t>(CharCount));
840 return std::error_code();
843 template <typename T>
844 static std::error_code remove_directories_impl(const T &Entry,
847 directory_iterator Begin(Entry, EC, false);
848 directory_iterator End;
849 while (Begin != End) {
852 EC = Item.status(st);
853 if (EC && !IgnoreErrors)
856 if (is_directory(st)) {
857 EC = remove_directories_impl(Item, IgnoreErrors);
858 if (EC && !IgnoreErrors)
862 EC = fs::remove(Item.path(), true);
863 if (EC && !IgnoreErrors)
867 if (EC && !IgnoreErrors)
870 return std::error_code();
873 std::error_code remove_directories(const Twine &path, bool IgnoreErrors) {
874 auto EC = remove_directories_impl(path, IgnoreErrors);
875 if (EC && !IgnoreErrors)
877 EC = fs::remove(path, true);
878 if (EC && !IgnoreErrors)
880 return std::error_code();
883 std::error_code real_path(const Twine &path, SmallVectorImpl<char> &dest,
886 if (path.isTriviallyEmpty())
887 return std::error_code();
890 SmallString<128> Storage;
891 path.toVector(Storage);
892 expandTildeExpr(Storage);
893 return real_path(Storage, dest, false);
897 std::error_code EC = openFileForRead(path, fd, &dest);
902 return std::error_code();
905 } // end namespace fs
909 bool home_directory(SmallVectorImpl<char> &result) {
910 if (char *RequestedDir = getenv("HOME")) {
912 result.append(RequestedDir, RequestedDir + strlen(RequestedDir));
918 static bool getDarwinConfDir(bool TempDir, SmallVectorImpl<char> &Result) {
919 #if defined(_CS_DARWIN_USER_TEMP_DIR) && defined(_CS_DARWIN_USER_CACHE_DIR)
920 // On Darwin, use DARWIN_USER_TEMP_DIR or DARWIN_USER_CACHE_DIR.
921 // macros defined in <unistd.h> on darwin >= 9
922 int ConfName = TempDir ? _CS_DARWIN_USER_TEMP_DIR
923 : _CS_DARWIN_USER_CACHE_DIR;
924 size_t ConfLen = confstr(ConfName, nullptr, 0);
927 Result.resize(ConfLen);
928 ConfLen = confstr(ConfName, Result.data(), Result.size());
929 } while (ConfLen > 0 && ConfLen != Result.size());
932 assert(Result.back() == 0);
943 static bool getUserCacheDir(SmallVectorImpl<char> &Result) {
944 // First try using XDG_CACHE_HOME env variable,
945 // as specified in XDG Base Directory Specification at
946 // http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html
947 if (const char *XdgCacheDir = std::getenv("XDG_CACHE_HOME")) {
949 Result.append(XdgCacheDir, XdgCacheDir + strlen(XdgCacheDir));
953 // Try Darwin configuration query
954 if (getDarwinConfDir(false, Result))
957 // Use "$HOME/.cache" if $HOME is available
958 if (home_directory(Result)) {
959 append(Result, ".cache");
966 static const char *getEnvTempDir() {
967 // Check whether the temporary directory is specified by an environment
969 const char *EnvironmentVariables[] = {"TMPDIR", "TMP", "TEMP", "TEMPDIR"};
970 for (const char *Env : EnvironmentVariables) {
971 if (const char *Dir = std::getenv(Env))
978 static const char *getDefaultTempDir(bool ErasedOnReboot) {
989 void system_temp_directory(bool ErasedOnReboot, SmallVectorImpl<char> &Result) {
992 if (ErasedOnReboot) {
993 // There is no env variable for the cache directory.
994 if (const char *RequestedDir = getEnvTempDir()) {
995 Result.append(RequestedDir, RequestedDir + strlen(RequestedDir));
1000 if (getDarwinConfDir(ErasedOnReboot, Result))
1003 const char *RequestedDir = getDefaultTempDir(ErasedOnReboot);
1004 Result.append(RequestedDir, RequestedDir + strlen(RequestedDir));
1007 } // end namespace path
1009 } // end namespace sys
1010 } // end namespace llvm