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/mount.h>
79 #include <sys/param.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(__OpenBSD__) || \
112 defined(__minix) || defined(__FreeBSD_kernel__) || defined(__linux__) || \
113 defined(__CYGWIN__) || defined(__DragonFly__) || defined(_AIX)
115 test_dir(char ret[PATH_MAX], const char *dir, const char *bin)
118 char fullpath[PATH_MAX];
120 snprintf(fullpath, PATH_MAX, "%s/%s", dir, bin);
121 if (!realpath(fullpath, ret))
123 if (stat(fullpath, &sb) != 0)
130 getprogpath(char ret[PATH_MAX], const char *bin)
134 /* First approach: absolute path. */
136 if (test_dir(ret, "/", bin) == 0)
141 /* Second approach: relative path. */
142 if (strchr(bin, '/')) {
144 if (!getcwd(cwd, PATH_MAX))
146 if (test_dir(ret, cwd, bin) == 0)
151 /* Third approach: $PATH */
152 if ((pv = getenv("PATH")) == nullptr)
157 while ((t = strsep(&s, ":")) != nullptr) {
158 if (test_dir(ret, t, bin) == 0) {
166 #endif // __FreeBSD__ || __NetBSD__ || __FreeBSD_kernel__
168 /// GetMainExecutable - Return the path to the main executable, given the
169 /// value of argv[0] from program startup.
170 std::string getMainExecutable(const char *argv0, void *MainAddr) {
171 #if defined(__APPLE__)
172 // On OS X the executable path is saved to the stack by dyld. Reading it
173 // from there is much faster than calling dladdr, especially for large
174 // binaries with symbols.
175 char exe_path[MAXPATHLEN];
176 uint32_t size = sizeof(exe_path);
177 if (_NSGetExecutablePath(exe_path, &size) == 0) {
178 char link_path[MAXPATHLEN];
179 if (realpath(exe_path, link_path))
182 #elif defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || \
183 defined(__minix) || defined(__DragonFly__) || \
184 defined(__FreeBSD_kernel__) || defined(_AIX)
185 char exe_path[PATH_MAX];
187 if (getprogpath(exe_path, argv0) != NULL)
189 #elif defined(__linux__) || defined(__CYGWIN__)
190 char exe_path[MAXPATHLEN];
191 StringRef aPath("/proc/self/exe");
192 if (sys::fs::exists(aPath)) {
193 // /proc is not always mounted under Linux (chroot for example).
194 ssize_t len = readlink(aPath.str().c_str(), exe_path, sizeof(exe_path));
196 return std::string(exe_path, len);
198 // Fall back to the classical detection.
199 if (getprogpath(exe_path, argv0))
202 #elif defined(HAVE_DLFCN_H) && defined(HAVE_DLADDR)
203 // Use dladdr to get executable path if available.
205 int err = dladdr(MainAddr, &DLInfo);
209 // If the filename is a symlink, we need to resolve and return the location of
210 // the actual executable.
211 char link_path[MAXPATHLEN];
212 if (realpath(DLInfo.dli_fname, link_path))
215 #error GetMainExecutable is not implemented on this host yet.
220 TimePoint<> basic_file_status::getLastAccessedTime() const {
221 return toTimePoint(fs_st_atime);
224 TimePoint<> basic_file_status::getLastModificationTime() const {
225 return toTimePoint(fs_st_mtime);
228 UniqueID file_status::getUniqueID() const {
229 return UniqueID(fs_st_dev, fs_st_ino);
232 uint32_t file_status::getLinkCount() const {
236 ErrorOr<space_info> disk_space(const Twine &Path) {
238 if (::STATVFS(Path.str().c_str(), &Vfs))
239 return std::error_code(errno, std::generic_category());
240 auto FrSize = STATVFS_F_FRSIZE(Vfs);
241 space_info SpaceInfo;
242 SpaceInfo.capacity = static_cast<uint64_t>(Vfs.f_blocks) * FrSize;
243 SpaceInfo.free = static_cast<uint64_t>(Vfs.f_bfree) * FrSize;
244 SpaceInfo.available = static_cast<uint64_t>(Vfs.f_bavail) * FrSize;
248 std::error_code current_path(SmallVectorImpl<char> &result) {
251 const char *pwd = ::getenv("PWD");
252 llvm::sys::fs::file_status PWDStatus, DotStatus;
253 if (pwd && llvm::sys::path::is_absolute(pwd) &&
254 !llvm::sys::fs::status(pwd, PWDStatus) &&
255 !llvm::sys::fs::status(".", DotStatus) &&
256 PWDStatus.getUniqueID() == DotStatus.getUniqueID()) {
257 result.append(pwd, pwd + strlen(pwd));
258 return std::error_code();
262 result.reserve(MAXPATHLEN);
265 result.reserve(1024);
269 if (::getcwd(result.data(), result.capacity()) == nullptr) {
270 // See if there was a real error.
272 return std::error_code(errno, std::generic_category());
273 // Otherwise there just wasn't enough space.
274 result.reserve(result.capacity() * 2);
279 result.set_size(strlen(result.data()));
280 return std::error_code();
283 std::error_code set_current_path(const Twine &path) {
284 SmallString<128> path_storage;
285 StringRef p = path.toNullTerminatedStringRef(path_storage);
287 if (::chdir(p.begin()) == -1)
288 return std::error_code(errno, std::generic_category());
290 return std::error_code();
293 std::error_code create_directory(const Twine &path, bool IgnoreExisting,
295 SmallString<128> path_storage;
296 StringRef p = path.toNullTerminatedStringRef(path_storage);
298 if (::mkdir(p.begin(), Perms) == -1) {
299 if (errno != EEXIST || !IgnoreExisting)
300 return std::error_code(errno, std::generic_category());
303 return std::error_code();
306 // Note that we are using symbolic link because hard links are not supported by
307 // all filesystems (SMB doesn't).
308 std::error_code create_link(const Twine &to, const Twine &from) {
310 SmallString<128> from_storage;
311 SmallString<128> to_storage;
312 StringRef f = from.toNullTerminatedStringRef(from_storage);
313 StringRef t = to.toNullTerminatedStringRef(to_storage);
315 if (::symlink(t.begin(), f.begin()) == -1)
316 return std::error_code(errno, std::generic_category());
318 return std::error_code();
321 std::error_code create_hard_link(const Twine &to, const Twine &from) {
323 SmallString<128> from_storage;
324 SmallString<128> to_storage;
325 StringRef f = from.toNullTerminatedStringRef(from_storage);
326 StringRef t = to.toNullTerminatedStringRef(to_storage);
328 if (::link(t.begin(), f.begin()) == -1)
329 return std::error_code(errno, std::generic_category());
331 return std::error_code();
334 std::error_code remove(const Twine &path, bool IgnoreNonExisting) {
335 SmallString<128> path_storage;
336 StringRef p = path.toNullTerminatedStringRef(path_storage);
339 if (lstat(p.begin(), &buf) != 0) {
340 if (errno != ENOENT || !IgnoreNonExisting)
341 return std::error_code(errno, std::generic_category());
342 return std::error_code();
345 // Note: this check catches strange situations. In all cases, LLVM should
346 // only be involved in the creation and deletion of regular files. This
347 // check ensures that what we're trying to erase is a regular file. It
348 // effectively prevents LLVM from erasing things like /dev/null, any block
349 // special file, or other things that aren't "regular" files.
350 if (!S_ISREG(buf.st_mode) && !S_ISDIR(buf.st_mode) && !S_ISLNK(buf.st_mode))
351 return make_error_code(errc::operation_not_permitted);
353 if (::remove(p.begin()) == -1) {
354 if (errno != ENOENT || !IgnoreNonExisting)
355 return std::error_code(errno, std::generic_category());
358 return std::error_code();
361 static bool is_local_impl(struct STATVFS &Vfs) {
362 #if defined(__linux__)
363 #ifndef NFS_SUPER_MAGIC
364 #define NFS_SUPER_MAGIC 0x6969
366 #ifndef SMB_SUPER_MAGIC
367 #define SMB_SUPER_MAGIC 0x517B
369 #ifndef CIFS_MAGIC_NUMBER
370 #define CIFS_MAGIC_NUMBER 0xFF534D42
372 switch ((uint32_t)Vfs.f_type) {
373 case NFS_SUPER_MAGIC:
374 case SMB_SUPER_MAGIC:
375 case CIFS_MAGIC_NUMBER:
380 #elif defined(__CYGWIN__)
381 // Cygwin doesn't expose this information; would need to use Win32 API.
384 // statvfs::f_basetype contains a null-terminated FSType name of the mounted target
385 StringRef fstype(Vfs.f_basetype);
386 // NFS is the only non-local fstype??
387 return !fstype.equals("nfs");
389 return !!(STATVFS_F_FLAG(Vfs) & MNT_LOCAL);
393 std::error_code is_local(const Twine &Path, bool &Result) {
395 if (::STATVFS(Path.str().c_str(), &Vfs))
396 return std::error_code(errno, std::generic_category());
398 Result = is_local_impl(Vfs);
399 return std::error_code();
402 std::error_code is_local(int FD, bool &Result) {
404 if (::FSTATVFS(FD, &Vfs))
405 return std::error_code(errno, std::generic_category());
407 Result = is_local_impl(Vfs);
408 return std::error_code();
411 std::error_code rename(const Twine &from, const Twine &to) {
413 SmallString<128> from_storage;
414 SmallString<128> to_storage;
415 StringRef f = from.toNullTerminatedStringRef(from_storage);
416 StringRef t = to.toNullTerminatedStringRef(to_storage);
418 if (::rename(f.begin(), t.begin()) == -1)
419 return std::error_code(errno, std::generic_category());
421 return std::error_code();
424 std::error_code resize_file(int FD, uint64_t Size) {
425 #if defined(HAVE_POSIX_FALLOCATE)
426 // If we have posix_fallocate use it. Unlike ftruncate it always allocates
427 // space, so we get an error if the disk is full.
428 if (int Err = ::posix_fallocate(FD, 0, Size)) {
429 if (Err != EINVAL && Err != EOPNOTSUPP)
430 return std::error_code(Err, std::generic_category());
433 // Use ftruncate as a fallback. It may or may not allocate space. At least on
434 // OS X with HFS+ it does.
435 if (::ftruncate(FD, Size) == -1)
436 return std::error_code(errno, std::generic_category());
438 return std::error_code();
441 static int convertAccessMode(AccessMode Mode) {
443 case AccessMode::Exist:
445 case AccessMode::Write:
447 case AccessMode::Execute:
448 return R_OK | X_OK; // scripts also need R_OK.
450 llvm_unreachable("invalid enum");
453 std::error_code access(const Twine &Path, AccessMode Mode) {
454 SmallString<128> PathStorage;
455 StringRef P = Path.toNullTerminatedStringRef(PathStorage);
457 if (::access(P.begin(), convertAccessMode(Mode)) == -1)
458 return std::error_code(errno, std::generic_category());
460 if (Mode == AccessMode::Execute) {
461 // Don't say that directories are executable.
463 if (0 != stat(P.begin(), &buf))
464 return errc::permission_denied;
465 if (!S_ISREG(buf.st_mode))
466 return errc::permission_denied;
469 return std::error_code();
472 bool can_execute(const Twine &Path) {
473 return !access(Path, AccessMode::Execute);
476 bool equivalent(file_status A, file_status B) {
477 assert(status_known(A) && status_known(B));
478 return A.fs_st_dev == B.fs_st_dev &&
479 A.fs_st_ino == B.fs_st_ino;
482 std::error_code equivalent(const Twine &A, const Twine &B, bool &result) {
483 file_status fsA, fsB;
484 if (std::error_code ec = status(A, fsA))
486 if (std::error_code ec = status(B, fsB))
488 result = equivalent(fsA, fsB);
489 return std::error_code();
492 static void expandTildeExpr(SmallVectorImpl<char> &Path) {
493 StringRef PathStr(Path.begin(), Path.size());
494 if (PathStr.empty() || !PathStr.startswith("~"))
497 PathStr = PathStr.drop_front();
499 PathStr.take_until([](char c) { return path::is_separator(c); });
500 StringRef Remainder = PathStr.substr(Expr.size() + 1);
501 SmallString<128> Storage;
503 // This is just ~/..., resolve it to the current user's home dir.
504 if (!path::home_directory(Storage)) {
505 // For some reason we couldn't get the home directory. Just exit.
509 // Overwrite the first character and insert the rest.
510 Path[0] = Storage[0];
511 Path.insert(Path.begin() + 1, Storage.begin() + 1, Storage.end());
515 // This is a string of the form ~username/, look up this user's entry in the
516 // password database.
517 struct passwd *Entry = nullptr;
518 std::string User = Expr.str();
519 Entry = ::getpwnam(User.c_str());
522 // Unable to look up the entry, just return back the original path.
528 Path.append(Entry->pw_dir, Entry->pw_dir + strlen(Entry->pw_dir));
529 llvm::sys::path::append(Path, Storage);
532 static std::error_code fillStatus(int StatRet, const struct stat &Status,
533 file_status &Result) {
535 std::error_code ec(errno, std::generic_category());
536 if (ec == errc::no_such_file_or_directory)
537 Result = file_status(file_type::file_not_found);
539 Result = file_status(file_type::status_error);
543 file_type Type = file_type::type_unknown;
545 if (S_ISDIR(Status.st_mode))
546 Type = file_type::directory_file;
547 else if (S_ISREG(Status.st_mode))
548 Type = file_type::regular_file;
549 else if (S_ISBLK(Status.st_mode))
550 Type = file_type::block_file;
551 else if (S_ISCHR(Status.st_mode))
552 Type = file_type::character_file;
553 else if (S_ISFIFO(Status.st_mode))
554 Type = file_type::fifo_file;
555 else if (S_ISSOCK(Status.st_mode))
556 Type = file_type::socket_file;
557 else if (S_ISLNK(Status.st_mode))
558 Type = file_type::symlink_file;
560 perms Perms = static_cast<perms>(Status.st_mode) & all_perms;
561 Result = file_status(Type, Perms, Status.st_dev, Status.st_nlink,
562 Status.st_ino, Status.st_atime, Status.st_mtime,
563 Status.st_uid, Status.st_gid, Status.st_size);
565 return std::error_code();
568 std::error_code status(const Twine &Path, file_status &Result, bool Follow) {
569 SmallString<128> PathStorage;
570 StringRef P = Path.toNullTerminatedStringRef(PathStorage);
573 int StatRet = (Follow ? ::stat : ::lstat)(P.begin(), &Status);
574 return fillStatus(StatRet, Status, Result);
577 std::error_code status(int FD, file_status &Result) {
579 int StatRet = ::fstat(FD, &Status);
580 return fillStatus(StatRet, Status, Result);
583 std::error_code setPermissions(const Twine &Path, perms Permissions) {
584 SmallString<128> PathStorage;
585 StringRef P = Path.toNullTerminatedStringRef(PathStorage);
587 if (::chmod(P.begin(), Permissions))
588 return std::error_code(errno, std::generic_category());
589 return std::error_code();
592 std::error_code setLastModificationAndAccessTime(int FD, TimePoint<> Time) {
593 #if defined(HAVE_FUTIMENS)
595 Times[0] = Times[1] = sys::toTimeSpec(Time);
596 if (::futimens(FD, Times))
597 return std::error_code(errno, std::generic_category());
598 return std::error_code();
599 #elif defined(HAVE_FUTIMES)
601 Times[0] = Times[1] = sys::toTimeVal(
602 std::chrono::time_point_cast<std::chrono::microseconds>(Time));
603 if (::futimes(FD, Times))
604 return std::error_code(errno, std::generic_category());
605 return std::error_code();
607 #warning Missing futimes() and futimens()
608 return make_error_code(errc::function_not_supported);
612 std::error_code mapped_file_region::init(int FD, uint64_t Offset,
616 int flags = (Mode == readwrite) ? MAP_SHARED : MAP_PRIVATE;
617 int prot = (Mode == readonly) ? PROT_READ : (PROT_READ | PROT_WRITE);
618 #if defined(__APPLE__)
619 //----------------------------------------------------------------------
620 // Newer versions of MacOSX have a flag that will allow us to read from
621 // binaries whose code signature is invalid without crashing by using
622 // the MAP_RESILIENT_CODESIGN flag. Also if a file from removable media
623 // is mapped we can avoid crashing and return zeroes to any pages we try
624 // to read if the media becomes unavailable by using the
625 // MAP_RESILIENT_MEDIA flag. These flags are only usable when mapping
626 // with PROT_READ, so take care not to specify them otherwise.
627 //----------------------------------------------------------------------
628 if (Mode == readonly) {
629 #if defined(MAP_RESILIENT_CODESIGN)
630 flags |= MAP_RESILIENT_CODESIGN;
632 #if defined(MAP_RESILIENT_MEDIA)
633 flags |= MAP_RESILIENT_MEDIA;
636 #endif // #if defined (__APPLE__)
638 Mapping = ::mmap(nullptr, Size, prot, flags, FD, Offset);
639 if (Mapping == MAP_FAILED)
640 return std::error_code(errno, std::generic_category());
641 return std::error_code();
644 mapped_file_region::mapped_file_region(int fd, mapmode mode, size_t length,
645 uint64_t offset, std::error_code &ec)
646 : Size(length), Mapping() {
647 ec = init(fd, offset, mode);
652 mapped_file_region::~mapped_file_region() {
654 ::munmap(Mapping, Size);
657 size_t mapped_file_region::size() const {
658 assert(Mapping && "Mapping failed but used anyway!");
662 char *mapped_file_region::data() const {
663 assert(Mapping && "Mapping failed but used anyway!");
664 return reinterpret_cast<char*>(Mapping);
667 const char *mapped_file_region::const_data() const {
668 assert(Mapping && "Mapping failed but used anyway!");
669 return reinterpret_cast<const char*>(Mapping);
672 int mapped_file_region::alignment() {
673 return Process::getPageSize();
676 std::error_code detail::directory_iterator_construct(detail::DirIterState &it,
678 bool follow_symlinks) {
679 SmallString<128> path_null(path);
680 DIR *directory = ::opendir(path_null.c_str());
682 return std::error_code(errno, std::generic_category());
684 it.IterationHandle = reinterpret_cast<intptr_t>(directory);
685 // Add something for replace_filename to replace.
686 path::append(path_null, ".");
687 it.CurrentEntry = directory_entry(path_null.str(), follow_symlinks);
688 return directory_iterator_increment(it);
691 std::error_code detail::directory_iterator_destruct(detail::DirIterState &it) {
692 if (it.IterationHandle)
693 ::closedir(reinterpret_cast<DIR *>(it.IterationHandle));
694 it.IterationHandle = 0;
695 it.CurrentEntry = directory_entry();
696 return std::error_code();
699 std::error_code detail::directory_iterator_increment(detail::DirIterState &it) {
701 dirent *cur_dir = ::readdir(reinterpret_cast<DIR *>(it.IterationHandle));
702 if (cur_dir == nullptr && errno != 0) {
703 return std::error_code(errno, std::generic_category());
704 } else if (cur_dir != nullptr) {
705 StringRef name(cur_dir->d_name, NAMLEN(cur_dir));
706 if ((name.size() == 1 && name[0] == '.') ||
707 (name.size() == 2 && name[0] == '.' && name[1] == '.'))
708 return directory_iterator_increment(it);
709 it.CurrentEntry.replace_filename(name);
711 return directory_iterator_destruct(it);
713 return std::error_code();
716 ErrorOr<basic_file_status> directory_entry::status() const {
718 if (auto EC = fs::status(Path, s, FollowSymlinks))
723 #if !defined(F_GETPATH)
724 static bool hasProcSelfFD() {
725 // If we have a /proc filesystem mounted, we can quickly establish the
726 // real name of the file with readlink
727 static const bool Result = (::access("/proc/self/fd", R_OK) == 0);
732 std::error_code openFileForRead(const Twine &Name, int &ResultFD,
733 SmallVectorImpl<char> *RealPath) {
734 SmallString<128> Storage;
735 StringRef P = Name.toNullTerminatedStringRef(Storage);
736 int OpenFlags = O_RDONLY;
738 OpenFlags |= O_CLOEXEC;
740 if ((ResultFD = sys::RetryAfterSignal(-1, open, P.begin(), OpenFlags)) < 0)
741 return std::error_code(errno, std::generic_category());
743 int r = fcntl(ResultFD, F_SETFD, FD_CLOEXEC);
745 assert(r == 0 && "fcntl(F_SETFD, FD_CLOEXEC) failed");
747 // Attempt to get the real name of the file, if the user asked
749 return std::error_code();
751 #if defined(F_GETPATH)
752 // When F_GETPATH is availble, it is the quickest way to get
753 // the real path name.
754 char Buffer[MAXPATHLEN];
755 if (::fcntl(ResultFD, F_GETPATH, Buffer) != -1)
756 RealPath->append(Buffer, Buffer + strlen(Buffer));
758 char Buffer[PATH_MAX];
759 if (hasProcSelfFD()) {
761 snprintf(ProcPath, sizeof(ProcPath), "/proc/self/fd/%d", ResultFD);
762 ssize_t CharCount = ::readlink(ProcPath, Buffer, sizeof(Buffer));
764 RealPath->append(Buffer, Buffer + CharCount);
766 // Use ::realpath to get the real path name
767 if (::realpath(P.begin(), Buffer) != nullptr)
768 RealPath->append(Buffer, Buffer + strlen(Buffer));
771 return std::error_code();
774 std::error_code openFileForWrite(const Twine &Name, int &ResultFD,
775 sys::fs::OpenFlags Flags, unsigned Mode) {
776 // Verify that we don't have both "append" and "excl".
777 assert((!(Flags & sys::fs::F_Excl) || !(Flags & sys::fs::F_Append)) &&
778 "Cannot specify both 'excl' and 'append' file creation flags!");
780 int OpenFlags = O_CREAT;
783 OpenFlags |= O_CLOEXEC;
789 OpenFlags |= O_WRONLY;
791 if (Flags & F_Append)
792 OpenFlags |= O_APPEND;
794 OpenFlags |= O_TRUNC;
799 SmallString<128> Storage;
800 StringRef P = Name.toNullTerminatedStringRef(Storage);
801 if ((ResultFD = sys::RetryAfterSignal(-1, open, P.begin(), OpenFlags, Mode)) < 0)
802 return std::error_code(errno, std::generic_category());
804 int r = fcntl(ResultFD, F_SETFD, FD_CLOEXEC);
806 assert(r == 0 && "fcntl(F_SETFD, FD_CLOEXEC) failed");
808 return std::error_code();
811 template <typename T>
812 static std::error_code remove_directories_impl(const T &Entry,
815 directory_iterator Begin(Entry, EC, false);
816 directory_iterator End;
817 while (Begin != End) {
819 ErrorOr<basic_file_status> st = Item.status();
820 if (!st && !IgnoreErrors)
821 return st.getError();
823 if (is_directory(*st)) {
824 EC = remove_directories_impl(Item, IgnoreErrors);
825 if (EC && !IgnoreErrors)
829 EC = fs::remove(Item.path(), true);
830 if (EC && !IgnoreErrors)
834 if (EC && !IgnoreErrors)
837 return std::error_code();
840 std::error_code remove_directories(const Twine &path, bool IgnoreErrors) {
841 auto EC = remove_directories_impl(path, IgnoreErrors);
842 if (EC && !IgnoreErrors)
844 EC = fs::remove(path, true);
845 if (EC && !IgnoreErrors)
847 return std::error_code();
850 std::error_code real_path(const Twine &path, SmallVectorImpl<char> &dest,
853 if (path.isTriviallyEmpty())
854 return std::error_code();
857 SmallString<128> Storage;
858 path.toVector(Storage);
859 expandTildeExpr(Storage);
860 return real_path(Storage, dest, false);
863 SmallString<128> Storage;
864 StringRef P = path.toNullTerminatedStringRef(Storage);
865 char Buffer[PATH_MAX];
866 if (::realpath(P.begin(), Buffer) == nullptr)
867 return std::error_code(errno, std::generic_category());
868 dest.append(Buffer, Buffer + strlen(Buffer));
869 return std::error_code();
872 } // end namespace fs
876 bool home_directory(SmallVectorImpl<char> &result) {
877 char *RequestedDir = getenv("HOME");
879 struct passwd *pw = getpwuid(getuid());
880 if (pw && pw->pw_dir)
881 RequestedDir = pw->pw_dir;
887 result.append(RequestedDir, RequestedDir + strlen(RequestedDir));
891 static bool getDarwinConfDir(bool TempDir, SmallVectorImpl<char> &Result) {
892 #if defined(_CS_DARWIN_USER_TEMP_DIR) && defined(_CS_DARWIN_USER_CACHE_DIR)
893 // On Darwin, use DARWIN_USER_TEMP_DIR or DARWIN_USER_CACHE_DIR.
894 // macros defined in <unistd.h> on darwin >= 9
895 int ConfName = TempDir ? _CS_DARWIN_USER_TEMP_DIR
896 : _CS_DARWIN_USER_CACHE_DIR;
897 size_t ConfLen = confstr(ConfName, nullptr, 0);
900 Result.resize(ConfLen);
901 ConfLen = confstr(ConfName, Result.data(), Result.size());
902 } while (ConfLen > 0 && ConfLen != Result.size());
905 assert(Result.back() == 0);
916 static bool getUserCacheDir(SmallVectorImpl<char> &Result) {
917 // First try using XDG_CACHE_HOME env variable,
918 // as specified in XDG Base Directory Specification at
919 // http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html
920 if (const char *XdgCacheDir = std::getenv("XDG_CACHE_HOME")) {
922 Result.append(XdgCacheDir, XdgCacheDir + strlen(XdgCacheDir));
926 // Try Darwin configuration query
927 if (getDarwinConfDir(false, Result))
930 // Use "$HOME/.cache" if $HOME is available
931 if (home_directory(Result)) {
932 append(Result, ".cache");
939 static const char *getEnvTempDir() {
940 // Check whether the temporary directory is specified by an environment
942 const char *EnvironmentVariables[] = {"TMPDIR", "TMP", "TEMP", "TEMPDIR"};
943 for (const char *Env : EnvironmentVariables) {
944 if (const char *Dir = std::getenv(Env))
951 static const char *getDefaultTempDir(bool ErasedOnReboot) {
962 void system_temp_directory(bool ErasedOnReboot, SmallVectorImpl<char> &Result) {
965 if (ErasedOnReboot) {
966 // There is no env variable for the cache directory.
967 if (const char *RequestedDir = getEnvTempDir()) {
968 Result.append(RequestedDir, RequestedDir + strlen(RequestedDir));
973 if (getDarwinConfDir(ErasedOnReboot, Result))
976 const char *RequestedDir = getDefaultTempDir(ErasedOnReboot);
977 Result.append(RequestedDir, RequestedDir + strlen(RequestedDir));
980 } // end namespace path
982 } // end namespace sys
983 } // end namespace llvm