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 uint32_t file_status::getLinkCount() const {
237 ErrorOr<space_info> disk_space(const Twine &Path) {
239 if (::STATVFS(Path.str().c_str(), &Vfs))
240 return std::error_code(errno, std::generic_category());
241 auto FrSize = STATVFS_F_FRSIZE(Vfs);
242 space_info SpaceInfo;
243 SpaceInfo.capacity = static_cast<uint64_t>(Vfs.f_blocks) * FrSize;
244 SpaceInfo.free = static_cast<uint64_t>(Vfs.f_bfree) * FrSize;
245 SpaceInfo.available = static_cast<uint64_t>(Vfs.f_bavail) * FrSize;
249 std::error_code current_path(SmallVectorImpl<char> &result) {
252 const char *pwd = ::getenv("PWD");
253 llvm::sys::fs::file_status PWDStatus, DotStatus;
254 if (pwd && llvm::sys::path::is_absolute(pwd) &&
255 !llvm::sys::fs::status(pwd, PWDStatus) &&
256 !llvm::sys::fs::status(".", DotStatus) &&
257 PWDStatus.getUniqueID() == DotStatus.getUniqueID()) {
258 result.append(pwd, pwd + strlen(pwd));
259 return std::error_code();
263 result.reserve(MAXPATHLEN);
266 result.reserve(1024);
270 if (::getcwd(result.data(), result.capacity()) == nullptr) {
271 // See if there was a real error.
273 return std::error_code(errno, std::generic_category());
274 // Otherwise there just wasn't enough space.
275 result.reserve(result.capacity() * 2);
280 result.set_size(strlen(result.data()));
281 return std::error_code();
284 std::error_code set_current_path(const Twine &path) {
285 SmallString<128> path_storage;
286 StringRef p = path.toNullTerminatedStringRef(path_storage);
288 if (::chdir(p.begin()) == -1)
289 return std::error_code(errno, std::generic_category());
291 return std::error_code();
294 std::error_code create_directory(const Twine &path, bool IgnoreExisting,
296 SmallString<128> path_storage;
297 StringRef p = path.toNullTerminatedStringRef(path_storage);
299 if (::mkdir(p.begin(), Perms) == -1) {
300 if (errno != EEXIST || !IgnoreExisting)
301 return std::error_code(errno, std::generic_category());
304 return std::error_code();
307 // Note that we are using symbolic link because hard links are not supported by
308 // all filesystems (SMB doesn't).
309 std::error_code create_link(const Twine &to, const Twine &from) {
311 SmallString<128> from_storage;
312 SmallString<128> to_storage;
313 StringRef f = from.toNullTerminatedStringRef(from_storage);
314 StringRef t = to.toNullTerminatedStringRef(to_storage);
316 if (::symlink(t.begin(), f.begin()) == -1)
317 return std::error_code(errno, std::generic_category());
319 return std::error_code();
322 std::error_code create_hard_link(const Twine &to, const Twine &from) {
324 SmallString<128> from_storage;
325 SmallString<128> to_storage;
326 StringRef f = from.toNullTerminatedStringRef(from_storage);
327 StringRef t = to.toNullTerminatedStringRef(to_storage);
329 if (::link(t.begin(), f.begin()) == -1)
330 return std::error_code(errno, std::generic_category());
332 return std::error_code();
335 std::error_code remove(const Twine &path, bool IgnoreNonExisting) {
336 SmallString<128> path_storage;
337 StringRef p = path.toNullTerminatedStringRef(path_storage);
340 if (lstat(p.begin(), &buf) != 0) {
341 if (errno != ENOENT || !IgnoreNonExisting)
342 return std::error_code(errno, std::generic_category());
343 return std::error_code();
346 // Note: this check catches strange situations. In all cases, LLVM should
347 // only be involved in the creation and deletion of regular files. This
348 // check ensures that what we're trying to erase is a regular file. It
349 // effectively prevents LLVM from erasing things like /dev/null, any block
350 // special file, or other things that aren't "regular" files.
351 if (!S_ISREG(buf.st_mode) && !S_ISDIR(buf.st_mode) && !S_ISLNK(buf.st_mode))
352 return make_error_code(errc::operation_not_permitted);
354 if (::remove(p.begin()) == -1) {
355 if (errno != ENOENT || !IgnoreNonExisting)
356 return std::error_code(errno, std::generic_category());
359 return std::error_code();
362 static bool is_local_impl(struct STATVFS &Vfs) {
363 #if defined(__linux__)
364 #ifndef NFS_SUPER_MAGIC
365 #define NFS_SUPER_MAGIC 0x6969
367 #ifndef SMB_SUPER_MAGIC
368 #define SMB_SUPER_MAGIC 0x517B
370 #ifndef CIFS_MAGIC_NUMBER
371 #define CIFS_MAGIC_NUMBER 0xFF534D42
373 switch ((uint32_t)Vfs.f_type) {
374 case NFS_SUPER_MAGIC:
375 case SMB_SUPER_MAGIC:
376 case CIFS_MAGIC_NUMBER:
381 #elif defined(__CYGWIN__)
382 // Cygwin doesn't expose this information; would need to use Win32 API.
385 return !!(STATVFS_F_FLAG(Vfs) & MNT_LOCAL);
389 std::error_code is_local(const Twine &Path, bool &Result) {
391 if (::STATVFS(Path.str().c_str(), &Vfs))
392 return std::error_code(errno, std::generic_category());
394 Result = is_local_impl(Vfs);
395 return std::error_code();
398 std::error_code is_local(int FD, bool &Result) {
400 if (::FSTATVFS(FD, &Vfs))
401 return std::error_code(errno, std::generic_category());
403 Result = is_local_impl(Vfs);
404 return std::error_code();
407 std::error_code rename(const Twine &from, const Twine &to) {
409 SmallString<128> from_storage;
410 SmallString<128> to_storage;
411 StringRef f = from.toNullTerminatedStringRef(from_storage);
412 StringRef t = to.toNullTerminatedStringRef(to_storage);
414 if (::rename(f.begin(), t.begin()) == -1)
415 return std::error_code(errno, std::generic_category());
417 return std::error_code();
420 std::error_code resize_file(int FD, uint64_t Size) {
421 #if defined(HAVE_POSIX_FALLOCATE)
422 // If we have posix_fallocate use it. Unlike ftruncate it always allocates
423 // space, so we get an error if the disk is full.
424 if (int Err = ::posix_fallocate(FD, 0, Size))
425 return std::error_code(Err, std::generic_category());
427 // Use ftruncate as a fallback. It may or may not allocate space. At least on
428 // OS X with HFS+ it does.
429 if (::ftruncate(FD, Size) == -1)
430 return std::error_code(errno, std::generic_category());
433 return std::error_code();
436 static int convertAccessMode(AccessMode Mode) {
438 case AccessMode::Exist:
440 case AccessMode::Write:
442 case AccessMode::Execute:
443 return R_OK | X_OK; // scripts also need R_OK.
445 llvm_unreachable("invalid enum");
448 std::error_code access(const Twine &Path, AccessMode Mode) {
449 SmallString<128> PathStorage;
450 StringRef P = Path.toNullTerminatedStringRef(PathStorage);
452 if (::access(P.begin(), convertAccessMode(Mode)) == -1)
453 return std::error_code(errno, std::generic_category());
455 if (Mode == AccessMode::Execute) {
456 // Don't say that directories are executable.
458 if (0 != stat(P.begin(), &buf))
459 return errc::permission_denied;
460 if (!S_ISREG(buf.st_mode))
461 return errc::permission_denied;
464 return std::error_code();
467 bool can_execute(const Twine &Path) {
468 return !access(Path, AccessMode::Execute);
471 bool equivalent(file_status A, file_status B) {
472 assert(status_known(A) && status_known(B));
473 return A.fs_st_dev == B.fs_st_dev &&
474 A.fs_st_ino == B.fs_st_ino;
477 std::error_code equivalent(const Twine &A, const Twine &B, bool &result) {
478 file_status fsA, fsB;
479 if (std::error_code ec = status(A, fsA))
481 if (std::error_code ec = status(B, fsB))
483 result = equivalent(fsA, fsB);
484 return std::error_code();
487 static void expandTildeExpr(SmallVectorImpl<char> &Path) {
488 StringRef PathStr(Path.begin(), Path.size());
489 if (PathStr.empty() || !PathStr.startswith("~"))
492 PathStr = PathStr.drop_front();
494 PathStr.take_until([](char c) { return path::is_separator(c); });
495 StringRef Remainder = PathStr.substr(Expr.size() + 1);
496 SmallString<128> Storage;
498 // This is just ~/..., resolve it to the current user's home dir.
499 if (!path::home_directory(Storage)) {
500 // For some reason we couldn't get the home directory. Just exit.
504 // Overwrite the first character and insert the rest.
505 Path[0] = Storage[0];
506 Path.insert(Path.begin() + 1, Storage.begin() + 1, Storage.end());
510 // This is a string of the form ~username/, look up this user's entry in the
511 // password database.
512 struct passwd *Entry = nullptr;
513 std::string User = Expr.str();
514 Entry = ::getpwnam(User.c_str());
517 // Unable to look up the entry, just return back the original path.
523 Path.append(Entry->pw_dir, Entry->pw_dir + strlen(Entry->pw_dir));
524 llvm::sys::path::append(Path, Storage);
527 static std::error_code fillStatus(int StatRet, const struct stat &Status,
528 file_status &Result) {
530 std::error_code ec(errno, std::generic_category());
531 if (ec == errc::no_such_file_or_directory)
532 Result = file_status(file_type::file_not_found);
534 Result = file_status(file_type::status_error);
538 file_type Type = file_type::type_unknown;
540 if (S_ISDIR(Status.st_mode))
541 Type = file_type::directory_file;
542 else if (S_ISREG(Status.st_mode))
543 Type = file_type::regular_file;
544 else if (S_ISBLK(Status.st_mode))
545 Type = file_type::block_file;
546 else if (S_ISCHR(Status.st_mode))
547 Type = file_type::character_file;
548 else if (S_ISFIFO(Status.st_mode))
549 Type = file_type::fifo_file;
550 else if (S_ISSOCK(Status.st_mode))
551 Type = file_type::socket_file;
552 else if (S_ISLNK(Status.st_mode))
553 Type = file_type::symlink_file;
555 perms Perms = static_cast<perms>(Status.st_mode) & all_perms;
556 Result = file_status(Type, Perms, Status.st_dev, Status.st_nlink,
557 Status.st_ino, Status.st_atime, Status.st_mtime,
558 Status.st_uid, Status.st_gid, Status.st_size);
560 return std::error_code();
563 std::error_code status(const Twine &Path, file_status &Result, bool Follow) {
564 SmallString<128> PathStorage;
565 StringRef P = Path.toNullTerminatedStringRef(PathStorage);
568 int StatRet = (Follow ? ::stat : ::lstat)(P.begin(), &Status);
569 return fillStatus(StatRet, Status, Result);
572 std::error_code status(int FD, file_status &Result) {
574 int StatRet = ::fstat(FD, &Status);
575 return fillStatus(StatRet, Status, Result);
578 std::error_code setPermissions(const Twine &Path, perms Permissions) {
579 SmallString<128> PathStorage;
580 StringRef P = Path.toNullTerminatedStringRef(PathStorage);
582 if (::chmod(P.begin(), Permissions))
583 return std::error_code(errno, std::generic_category());
584 return std::error_code();
587 std::error_code setLastModificationAndAccessTime(int FD, TimePoint<> Time) {
588 #if defined(HAVE_FUTIMENS)
590 Times[0] = Times[1] = sys::toTimeSpec(Time);
591 if (::futimens(FD, Times))
592 return std::error_code(errno, std::generic_category());
593 return std::error_code();
594 #elif defined(HAVE_FUTIMES)
596 Times[0] = Times[1] = sys::toTimeVal(
597 std::chrono::time_point_cast<std::chrono::microseconds>(Time));
598 if (::futimes(FD, Times))
599 return std::error_code(errno, std::generic_category());
600 return std::error_code();
602 #warning Missing futimes() and futimens()
603 return make_error_code(errc::function_not_supported);
607 std::error_code mapped_file_region::init(int FD, uint64_t Offset,
611 int flags = (Mode == readwrite) ? MAP_SHARED : MAP_PRIVATE;
612 int prot = (Mode == readonly) ? PROT_READ : (PROT_READ | PROT_WRITE);
613 #if defined(__APPLE__)
614 //----------------------------------------------------------------------
615 // Newer versions of MacOSX have a flag that will allow us to read from
616 // binaries whose code signature is invalid without crashing by using
617 // the MAP_RESILIENT_CODESIGN flag. Also if a file from removable media
618 // is mapped we can avoid crashing and return zeroes to any pages we try
619 // to read if the media becomes unavailable by using the
620 // MAP_RESILIENT_MEDIA flag. These flags are only usable when mapping
621 // with PROT_READ, so take care not to specify them otherwise.
622 //----------------------------------------------------------------------
623 if (Mode == readonly) {
624 #if defined(MAP_RESILIENT_CODESIGN)
625 flags |= MAP_RESILIENT_CODESIGN;
627 #if defined(MAP_RESILIENT_MEDIA)
628 flags |= MAP_RESILIENT_MEDIA;
631 #endif // #if defined (__APPLE__)
633 Mapping = ::mmap(nullptr, Size, prot, flags, FD, Offset);
634 if (Mapping == MAP_FAILED)
635 return std::error_code(errno, std::generic_category());
636 return std::error_code();
639 mapped_file_region::mapped_file_region(int fd, mapmode mode, uint64_t length,
640 uint64_t offset, std::error_code &ec)
641 : Size(length), Mapping() {
642 // Make sure that the requested size fits within SIZE_T.
643 if (length > std::numeric_limits<size_t>::max()) {
644 ec = make_error_code(errc::invalid_argument);
648 ec = init(fd, offset, mode);
653 mapped_file_region::~mapped_file_region() {
655 ::munmap(Mapping, Size);
658 uint64_t mapped_file_region::size() const {
659 assert(Mapping && "Mapping failed but used anyway!");
663 char *mapped_file_region::data() const {
664 assert(Mapping && "Mapping failed but used anyway!");
665 return reinterpret_cast<char*>(Mapping);
668 const char *mapped_file_region::const_data() const {
669 assert(Mapping && "Mapping failed but used anyway!");
670 return reinterpret_cast<const char*>(Mapping);
673 int mapped_file_region::alignment() {
674 return Process::getPageSize();
677 std::error_code detail::directory_iterator_construct(detail::DirIterState &it,
679 bool follow_symlinks) {
680 SmallString<128> path_null(path);
681 DIR *directory = ::opendir(path_null.c_str());
683 return std::error_code(errno, std::generic_category());
685 it.IterationHandle = reinterpret_cast<intptr_t>(directory);
686 // Add something for replace_filename to replace.
687 path::append(path_null, ".");
688 it.CurrentEntry = directory_entry(path_null.str(), follow_symlinks);
689 return directory_iterator_increment(it);
692 std::error_code detail::directory_iterator_destruct(detail::DirIterState &it) {
693 if (it.IterationHandle)
694 ::closedir(reinterpret_cast<DIR *>(it.IterationHandle));
695 it.IterationHandle = 0;
696 it.CurrentEntry = directory_entry();
697 return std::error_code();
700 std::error_code detail::directory_iterator_increment(detail::DirIterState &it) {
702 dirent *cur_dir = ::readdir(reinterpret_cast<DIR *>(it.IterationHandle));
703 if (cur_dir == nullptr && errno != 0) {
704 return std::error_code(errno, std::generic_category());
705 } else if (cur_dir != nullptr) {
706 StringRef name(cur_dir->d_name, NAMLEN(cur_dir));
707 if ((name.size() == 1 && name[0] == '.') ||
708 (name.size() == 2 && name[0] == '.' && name[1] == '.'))
709 return directory_iterator_increment(it);
710 it.CurrentEntry.replace_filename(name);
712 return directory_iterator_destruct(it);
714 return std::error_code();
717 #if !defined(F_GETPATH)
718 static bool hasProcSelfFD() {
719 // If we have a /proc filesystem mounted, we can quickly establish the
720 // real name of the file with readlink
721 static const bool Result = (::access("/proc/self/fd", R_OK) == 0);
726 std::error_code openFileForRead(const Twine &Name, int &ResultFD,
727 SmallVectorImpl<char> *RealPath) {
728 SmallString<128> Storage;
729 StringRef P = Name.toNullTerminatedStringRef(Storage);
730 int OpenFlags = O_RDONLY;
732 OpenFlags |= O_CLOEXEC;
734 while ((ResultFD = open(P.begin(), OpenFlags)) < 0) {
736 return std::error_code(errno, std::generic_category());
739 int r = fcntl(ResultFD, F_SETFD, FD_CLOEXEC);
741 assert(r == 0 && "fcntl(F_SETFD, FD_CLOEXEC) failed");
743 // Attempt to get the real name of the file, if the user asked
745 return std::error_code();
747 #if defined(F_GETPATH)
748 // When F_GETPATH is availble, it is the quickest way to get
749 // the real path name.
750 char Buffer[MAXPATHLEN];
751 if (::fcntl(ResultFD, F_GETPATH, Buffer) != -1)
752 RealPath->append(Buffer, Buffer + strlen(Buffer));
754 char Buffer[PATH_MAX];
755 if (hasProcSelfFD()) {
757 snprintf(ProcPath, sizeof(ProcPath), "/proc/self/fd/%d", ResultFD);
758 ssize_t CharCount = ::readlink(ProcPath, Buffer, sizeof(Buffer));
760 RealPath->append(Buffer, Buffer + CharCount);
762 // Use ::realpath to get the real path name
763 if (::realpath(P.begin(), Buffer) != nullptr)
764 RealPath->append(Buffer, Buffer + strlen(Buffer));
767 return std::error_code();
770 std::error_code openFileForWrite(const Twine &Name, int &ResultFD,
771 sys::fs::OpenFlags Flags, unsigned Mode) {
772 // Verify that we don't have both "append" and "excl".
773 assert((!(Flags & sys::fs::F_Excl) || !(Flags & sys::fs::F_Append)) &&
774 "Cannot specify both 'excl' and 'append' file creation flags!");
776 int OpenFlags = O_CREAT;
779 OpenFlags |= O_CLOEXEC;
785 OpenFlags |= O_WRONLY;
787 if (Flags & F_Append)
788 OpenFlags |= O_APPEND;
790 OpenFlags |= O_TRUNC;
795 SmallString<128> Storage;
796 StringRef P = Name.toNullTerminatedStringRef(Storage);
797 while ((ResultFD = open(P.begin(), OpenFlags, Mode)) < 0) {
799 return std::error_code(errno, std::generic_category());
802 int r = fcntl(ResultFD, F_SETFD, FD_CLOEXEC);
804 assert(r == 0 && "fcntl(F_SETFD, FD_CLOEXEC) failed");
806 return std::error_code();
809 std::error_code getPathFromOpenFD(int FD, SmallVectorImpl<char> &ResultPath) {
811 return make_error_code(errc::bad_file_descriptor);
813 #if defined(F_GETPATH)
814 // When F_GETPATH is availble, it is the quickest way to get
815 // the path from a file descriptor.
816 ResultPath.reserve(MAXPATHLEN);
817 if (::fcntl(FD, F_GETPATH, ResultPath.begin()) == -1)
818 return std::error_code(errno, std::generic_category());
820 ResultPath.set_size(strlen(ResultPath.begin()));
822 // If we have a /proc filesystem mounted, we can quickly establish the
823 // real name of the file with readlink. Otherwise, we don't know how to
824 // get the filename from a file descriptor. Give up.
825 if (!fs::hasProcSelfFD())
826 return make_error_code(errc::function_not_supported);
828 ResultPath.reserve(PATH_MAX);
830 snprintf(ProcPath, sizeof(ProcPath), "/proc/self/fd/%d", FD);
831 ssize_t CharCount = ::readlink(ProcPath, ResultPath.begin(), ResultPath.capacity());
833 return std::error_code(errno, std::generic_category());
835 // Was the filename truncated?
836 if (static_cast<size_t>(CharCount) == ResultPath.capacity()) {
837 // Use lstat to get the size of the filename
839 if (::lstat(ProcPath, &sb) < 0)
840 return std::error_code(errno, std::generic_category());
842 ResultPath.reserve(sb.st_size + 1);
843 CharCount = ::readlink(ProcPath, ResultPath.begin(), ResultPath.capacity());
845 return std::error_code(errno, std::generic_category());
847 // Test for race condition: did the link size change?
848 if (CharCount > sb.st_size)
849 return std::error_code(ENAMETOOLONG, std::generic_category());
851 ResultPath.set_size(static_cast<size_t>(CharCount));
853 return std::error_code();
856 template <typename T>
857 static std::error_code remove_directories_impl(const T &Entry,
860 directory_iterator Begin(Entry, EC, false);
861 directory_iterator End;
862 while (Begin != End) {
865 EC = Item.status(st);
866 if (EC && !IgnoreErrors)
869 if (is_directory(st)) {
870 EC = remove_directories_impl(Item, IgnoreErrors);
871 if (EC && !IgnoreErrors)
875 EC = fs::remove(Item.path(), true);
876 if (EC && !IgnoreErrors)
880 if (EC && !IgnoreErrors)
883 return std::error_code();
886 std::error_code remove_directories(const Twine &path, bool IgnoreErrors) {
887 auto EC = remove_directories_impl(path, IgnoreErrors);
888 if (EC && !IgnoreErrors)
890 EC = fs::remove(path, true);
891 if (EC && !IgnoreErrors)
893 return std::error_code();
896 std::error_code real_path(const Twine &path, SmallVectorImpl<char> &dest,
899 if (path.isTriviallyEmpty())
900 return std::error_code();
903 SmallString<128> Storage;
904 path.toVector(Storage);
905 expandTildeExpr(Storage);
906 return real_path(Storage, dest, false);
910 std::error_code EC = openFileForRead(path, fd, &dest);
915 return std::error_code();
918 } // end namespace fs
922 bool home_directory(SmallVectorImpl<char> &result) {
923 char *RequestedDir = getenv("HOME");
925 struct passwd *pw = getpwuid(getuid());
926 if (pw && pw->pw_dir)
927 RequestedDir = pw->pw_dir;
933 result.append(RequestedDir, RequestedDir + strlen(RequestedDir));
937 static bool getDarwinConfDir(bool TempDir, SmallVectorImpl<char> &Result) {
938 #if defined(_CS_DARWIN_USER_TEMP_DIR) && defined(_CS_DARWIN_USER_CACHE_DIR)
939 // On Darwin, use DARWIN_USER_TEMP_DIR or DARWIN_USER_CACHE_DIR.
940 // macros defined in <unistd.h> on darwin >= 9
941 int ConfName = TempDir ? _CS_DARWIN_USER_TEMP_DIR
942 : _CS_DARWIN_USER_CACHE_DIR;
943 size_t ConfLen = confstr(ConfName, nullptr, 0);
946 Result.resize(ConfLen);
947 ConfLen = confstr(ConfName, Result.data(), Result.size());
948 } while (ConfLen > 0 && ConfLen != Result.size());
951 assert(Result.back() == 0);
962 static bool getUserCacheDir(SmallVectorImpl<char> &Result) {
963 // First try using XDG_CACHE_HOME env variable,
964 // as specified in XDG Base Directory Specification at
965 // http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html
966 if (const char *XdgCacheDir = std::getenv("XDG_CACHE_HOME")) {
968 Result.append(XdgCacheDir, XdgCacheDir + strlen(XdgCacheDir));
972 // Try Darwin configuration query
973 if (getDarwinConfDir(false, Result))
976 // Use "$HOME/.cache" if $HOME is available
977 if (home_directory(Result)) {
978 append(Result, ".cache");
985 static const char *getEnvTempDir() {
986 // Check whether the temporary directory is specified by an environment
988 const char *EnvironmentVariables[] = {"TMPDIR", "TMP", "TEMP", "TEMPDIR"};
989 for (const char *Env : EnvironmentVariables) {
990 if (const char *Dir = std::getenv(Env))
997 static const char *getDefaultTempDir(bool ErasedOnReboot) {
1008 void system_temp_directory(bool ErasedOnReboot, SmallVectorImpl<char> &Result) {
1011 if (ErasedOnReboot) {
1012 // There is no env variable for the cache directory.
1013 if (const char *RequestedDir = getEnvTempDir()) {
1014 Result.append(RequestedDir, RequestedDir + strlen(RequestedDir));
1019 if (getDarwinConfDir(ErasedOnReboot, Result))
1022 const char *RequestedDir = getDefaultTempDir(ErasedOnReboot);
1023 Result.append(RequestedDir, RequestedDir + strlen(RequestedDir));
1026 } // end namespace path
1028 } // end namespace sys
1029 } // end namespace llvm