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(__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 // statvfs::f_basetype contains a null-terminated FSType name of the mounted target
386 StringRef fstype(Vfs.f_basetype);
387 // NFS is the only non-local fstype??
388 return !fstype.equals("nfs");
390 return !!(STATVFS_F_FLAG(Vfs) & MNT_LOCAL);
394 std::error_code is_local(const Twine &Path, bool &Result) {
396 if (::STATVFS(Path.str().c_str(), &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 is_local(int FD, bool &Result) {
405 if (::FSTATVFS(FD, &Vfs))
406 return std::error_code(errno, std::generic_category());
408 Result = is_local_impl(Vfs);
409 return std::error_code();
412 std::error_code rename(const Twine &from, const Twine &to) {
414 SmallString<128> from_storage;
415 SmallString<128> to_storage;
416 StringRef f = from.toNullTerminatedStringRef(from_storage);
417 StringRef t = to.toNullTerminatedStringRef(to_storage);
419 if (::rename(f.begin(), t.begin()) == -1)
420 return std::error_code(errno, std::generic_category());
422 return std::error_code();
425 std::error_code resize_file(int FD, uint64_t Size) {
426 #if defined(HAVE_POSIX_FALLOCATE)
427 // If we have posix_fallocate use it. Unlike ftruncate it always allocates
428 // space, so we get an error if the disk is full.
429 if (int Err = ::posix_fallocate(FD, 0, Size)) {
430 if (Err != EOPNOTSUPP)
431 return std::error_code(Err, std::generic_category());
434 // Use ftruncate as a fallback. It may or may not allocate space. At least on
435 // OS X with HFS+ it does.
436 if (::ftruncate(FD, Size) == -1)
437 return std::error_code(errno, std::generic_category());
439 return std::error_code();
442 static int convertAccessMode(AccessMode Mode) {
444 case AccessMode::Exist:
446 case AccessMode::Write:
448 case AccessMode::Execute:
449 return R_OK | X_OK; // scripts also need R_OK.
451 llvm_unreachable("invalid enum");
454 std::error_code access(const Twine &Path, AccessMode Mode) {
455 SmallString<128> PathStorage;
456 StringRef P = Path.toNullTerminatedStringRef(PathStorage);
458 if (::access(P.begin(), convertAccessMode(Mode)) == -1)
459 return std::error_code(errno, std::generic_category());
461 if (Mode == AccessMode::Execute) {
462 // Don't say that directories are executable.
464 if (0 != stat(P.begin(), &buf))
465 return errc::permission_denied;
466 if (!S_ISREG(buf.st_mode))
467 return errc::permission_denied;
470 return std::error_code();
473 bool can_execute(const Twine &Path) {
474 return !access(Path, AccessMode::Execute);
477 bool equivalent(file_status A, file_status B) {
478 assert(status_known(A) && status_known(B));
479 return A.fs_st_dev == B.fs_st_dev &&
480 A.fs_st_ino == B.fs_st_ino;
483 std::error_code equivalent(const Twine &A, const Twine &B, bool &result) {
484 file_status fsA, fsB;
485 if (std::error_code ec = status(A, fsA))
487 if (std::error_code ec = status(B, fsB))
489 result = equivalent(fsA, fsB);
490 return std::error_code();
493 static void expandTildeExpr(SmallVectorImpl<char> &Path) {
494 StringRef PathStr(Path.begin(), Path.size());
495 if (PathStr.empty() || !PathStr.startswith("~"))
498 PathStr = PathStr.drop_front();
500 PathStr.take_until([](char c) { return path::is_separator(c); });
501 StringRef Remainder = PathStr.substr(Expr.size() + 1);
502 SmallString<128> Storage;
504 // This is just ~/..., resolve it to the current user's home dir.
505 if (!path::home_directory(Storage)) {
506 // For some reason we couldn't get the home directory. Just exit.
510 // Overwrite the first character and insert the rest.
511 Path[0] = Storage[0];
512 Path.insert(Path.begin() + 1, Storage.begin() + 1, Storage.end());
516 // This is a string of the form ~username/, look up this user's entry in the
517 // password database.
518 struct passwd *Entry = nullptr;
519 std::string User = Expr.str();
520 Entry = ::getpwnam(User.c_str());
523 // Unable to look up the entry, just return back the original path.
529 Path.append(Entry->pw_dir, Entry->pw_dir + strlen(Entry->pw_dir));
530 llvm::sys::path::append(Path, Storage);
533 static std::error_code fillStatus(int StatRet, const struct stat &Status,
534 file_status &Result) {
536 std::error_code ec(errno, std::generic_category());
537 if (ec == errc::no_such_file_or_directory)
538 Result = file_status(file_type::file_not_found);
540 Result = file_status(file_type::status_error);
544 file_type Type = file_type::type_unknown;
546 if (S_ISDIR(Status.st_mode))
547 Type = file_type::directory_file;
548 else if (S_ISREG(Status.st_mode))
549 Type = file_type::regular_file;
550 else if (S_ISBLK(Status.st_mode))
551 Type = file_type::block_file;
552 else if (S_ISCHR(Status.st_mode))
553 Type = file_type::character_file;
554 else if (S_ISFIFO(Status.st_mode))
555 Type = file_type::fifo_file;
556 else if (S_ISSOCK(Status.st_mode))
557 Type = file_type::socket_file;
558 else if (S_ISLNK(Status.st_mode))
559 Type = file_type::symlink_file;
561 perms Perms = static_cast<perms>(Status.st_mode) & all_perms;
562 Result = file_status(Type, Perms, Status.st_dev, Status.st_nlink,
563 Status.st_ino, Status.st_atime, Status.st_mtime,
564 Status.st_uid, Status.st_gid, Status.st_size);
566 return std::error_code();
569 std::error_code status(const Twine &Path, file_status &Result, bool Follow) {
570 SmallString<128> PathStorage;
571 StringRef P = Path.toNullTerminatedStringRef(PathStorage);
574 int StatRet = (Follow ? ::stat : ::lstat)(P.begin(), &Status);
575 return fillStatus(StatRet, Status, Result);
578 std::error_code status(int FD, file_status &Result) {
580 int StatRet = ::fstat(FD, &Status);
581 return fillStatus(StatRet, Status, Result);
584 std::error_code setPermissions(const Twine &Path, perms Permissions) {
585 SmallString<128> PathStorage;
586 StringRef P = Path.toNullTerminatedStringRef(PathStorage);
588 if (::chmod(P.begin(), Permissions))
589 return std::error_code(errno, std::generic_category());
590 return std::error_code();
593 std::error_code setLastModificationAndAccessTime(int FD, TimePoint<> Time) {
594 #if defined(HAVE_FUTIMENS)
596 Times[0] = Times[1] = sys::toTimeSpec(Time);
597 if (::futimens(FD, Times))
598 return std::error_code(errno, std::generic_category());
599 return std::error_code();
600 #elif defined(HAVE_FUTIMES)
602 Times[0] = Times[1] = sys::toTimeVal(
603 std::chrono::time_point_cast<std::chrono::microseconds>(Time));
604 if (::futimes(FD, Times))
605 return std::error_code(errno, std::generic_category());
606 return std::error_code();
608 #warning Missing futimes() and futimens()
609 return make_error_code(errc::function_not_supported);
613 std::error_code mapped_file_region::init(int FD, uint64_t Offset,
617 int flags = (Mode == readwrite) ? MAP_SHARED : MAP_PRIVATE;
618 int prot = (Mode == readonly) ? PROT_READ : (PROT_READ | PROT_WRITE);
619 #if defined(__APPLE__)
620 //----------------------------------------------------------------------
621 // Newer versions of MacOSX have a flag that will allow us to read from
622 // binaries whose code signature is invalid without crashing by using
623 // the MAP_RESILIENT_CODESIGN flag. Also if a file from removable media
624 // is mapped we can avoid crashing and return zeroes to any pages we try
625 // to read if the media becomes unavailable by using the
626 // MAP_RESILIENT_MEDIA flag. These flags are only usable when mapping
627 // with PROT_READ, so take care not to specify them otherwise.
628 //----------------------------------------------------------------------
629 if (Mode == readonly) {
630 #if defined(MAP_RESILIENT_CODESIGN)
631 flags |= MAP_RESILIENT_CODESIGN;
633 #if defined(MAP_RESILIENT_MEDIA)
634 flags |= MAP_RESILIENT_MEDIA;
637 #endif // #if defined (__APPLE__)
639 Mapping = ::mmap(nullptr, Size, prot, flags, FD, Offset);
640 if (Mapping == MAP_FAILED)
641 return std::error_code(errno, std::generic_category());
642 return std::error_code();
645 mapped_file_region::mapped_file_region(int fd, mapmode mode, uint64_t length,
646 uint64_t offset, std::error_code &ec)
647 : Size(length), Mapping() {
648 // Make sure that the requested size fits within SIZE_T.
649 if (length > std::numeric_limits<size_t>::max()) {
650 ec = make_error_code(errc::invalid_argument);
654 ec = init(fd, offset, mode);
659 mapped_file_region::~mapped_file_region() {
661 ::munmap(Mapping, Size);
664 uint64_t mapped_file_region::size() const {
665 assert(Mapping && "Mapping failed but used anyway!");
669 char *mapped_file_region::data() const {
670 assert(Mapping && "Mapping failed but used anyway!");
671 return reinterpret_cast<char*>(Mapping);
674 const char *mapped_file_region::const_data() const {
675 assert(Mapping && "Mapping failed but used anyway!");
676 return reinterpret_cast<const char*>(Mapping);
679 int mapped_file_region::alignment() {
680 return Process::getPageSize();
683 std::error_code detail::directory_iterator_construct(detail::DirIterState &it,
685 bool follow_symlinks) {
686 SmallString<128> path_null(path);
687 DIR *directory = ::opendir(path_null.c_str());
689 return std::error_code(errno, std::generic_category());
691 it.IterationHandle = reinterpret_cast<intptr_t>(directory);
692 // Add something for replace_filename to replace.
693 path::append(path_null, ".");
694 it.CurrentEntry = directory_entry(path_null.str(), follow_symlinks);
695 return directory_iterator_increment(it);
698 std::error_code detail::directory_iterator_destruct(detail::DirIterState &it) {
699 if (it.IterationHandle)
700 ::closedir(reinterpret_cast<DIR *>(it.IterationHandle));
701 it.IterationHandle = 0;
702 it.CurrentEntry = directory_entry();
703 return std::error_code();
706 std::error_code detail::directory_iterator_increment(detail::DirIterState &it) {
708 dirent *cur_dir = ::readdir(reinterpret_cast<DIR *>(it.IterationHandle));
709 if (cur_dir == nullptr && errno != 0) {
710 return std::error_code(errno, std::generic_category());
711 } else if (cur_dir != nullptr) {
712 StringRef name(cur_dir->d_name, NAMLEN(cur_dir));
713 if ((name.size() == 1 && name[0] == '.') ||
714 (name.size() == 2 && name[0] == '.' && name[1] == '.'))
715 return directory_iterator_increment(it);
716 it.CurrentEntry.replace_filename(name);
718 return directory_iterator_destruct(it);
720 return std::error_code();
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 std::error_code getPathFromOpenFD(int FD, SmallVectorImpl<char> &ResultPath) {
813 return make_error_code(errc::bad_file_descriptor);
815 #if defined(F_GETPATH)
816 // When F_GETPATH is availble, it is the quickest way to get
817 // the path from a file descriptor.
818 ResultPath.reserve(MAXPATHLEN);
819 if (::fcntl(FD, F_GETPATH, ResultPath.begin()) == -1)
820 return std::error_code(errno, std::generic_category());
822 ResultPath.set_size(strlen(ResultPath.begin()));
824 // If we have a /proc filesystem mounted, we can quickly establish the
825 // real name of the file with readlink. Otherwise, we don't know how to
826 // get the filename from a file descriptor. Give up.
827 if (!fs::hasProcSelfFD())
828 return make_error_code(errc::function_not_supported);
830 ResultPath.reserve(PATH_MAX);
832 snprintf(ProcPath, sizeof(ProcPath), "/proc/self/fd/%d", FD);
833 ssize_t CharCount = ::readlink(ProcPath, ResultPath.begin(), ResultPath.capacity());
835 return std::error_code(errno, std::generic_category());
837 // Was the filename truncated?
838 if (static_cast<size_t>(CharCount) == ResultPath.capacity()) {
839 // Use lstat to get the size of the filename
841 if (::lstat(ProcPath, &sb) < 0)
842 return std::error_code(errno, std::generic_category());
844 ResultPath.reserve(sb.st_size + 1);
845 CharCount = ::readlink(ProcPath, ResultPath.begin(), ResultPath.capacity());
847 return std::error_code(errno, std::generic_category());
849 // Test for race condition: did the link size change?
850 if (CharCount > sb.st_size)
851 return std::error_code(ENAMETOOLONG, std::generic_category());
853 ResultPath.set_size(static_cast<size_t>(CharCount));
855 return std::error_code();
858 template <typename T>
859 static std::error_code remove_directories_impl(const T &Entry,
862 directory_iterator Begin(Entry, EC, false);
863 directory_iterator End;
864 while (Begin != End) {
867 EC = Item.status(st);
868 if (EC && !IgnoreErrors)
871 if (is_directory(st)) {
872 EC = remove_directories_impl(Item, IgnoreErrors);
873 if (EC && !IgnoreErrors)
877 EC = fs::remove(Item.path(), true);
878 if (EC && !IgnoreErrors)
882 if (EC && !IgnoreErrors)
885 return std::error_code();
888 std::error_code remove_directories(const Twine &path, bool IgnoreErrors) {
889 auto EC = remove_directories_impl(path, IgnoreErrors);
890 if (EC && !IgnoreErrors)
892 EC = fs::remove(path, true);
893 if (EC && !IgnoreErrors)
895 return std::error_code();
898 std::error_code real_path(const Twine &path, SmallVectorImpl<char> &dest,
901 if (path.isTriviallyEmpty())
902 return std::error_code();
905 SmallString<128> Storage;
906 path.toVector(Storage);
907 expandTildeExpr(Storage);
908 return real_path(Storage, dest, false);
912 std::error_code EC = openFileForRead(path, fd, &dest);
917 return std::error_code();
920 } // end namespace fs
924 bool home_directory(SmallVectorImpl<char> &result) {
925 char *RequestedDir = getenv("HOME");
927 struct passwd *pw = getpwuid(getuid());
928 if (pw && pw->pw_dir)
929 RequestedDir = pw->pw_dir;
935 result.append(RequestedDir, RequestedDir + strlen(RequestedDir));
939 static bool getDarwinConfDir(bool TempDir, SmallVectorImpl<char> &Result) {
940 #if defined(_CS_DARWIN_USER_TEMP_DIR) && defined(_CS_DARWIN_USER_CACHE_DIR)
941 // On Darwin, use DARWIN_USER_TEMP_DIR or DARWIN_USER_CACHE_DIR.
942 // macros defined in <unistd.h> on darwin >= 9
943 int ConfName = TempDir ? _CS_DARWIN_USER_TEMP_DIR
944 : _CS_DARWIN_USER_CACHE_DIR;
945 size_t ConfLen = confstr(ConfName, nullptr, 0);
948 Result.resize(ConfLen);
949 ConfLen = confstr(ConfName, Result.data(), Result.size());
950 } while (ConfLen > 0 && ConfLen != Result.size());
953 assert(Result.back() == 0);
964 static bool getUserCacheDir(SmallVectorImpl<char> &Result) {
965 // First try using XDG_CACHE_HOME env variable,
966 // as specified in XDG Base Directory Specification at
967 // http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html
968 if (const char *XdgCacheDir = std::getenv("XDG_CACHE_HOME")) {
970 Result.append(XdgCacheDir, XdgCacheDir + strlen(XdgCacheDir));
974 // Try Darwin configuration query
975 if (getDarwinConfDir(false, Result))
978 // Use "$HOME/.cache" if $HOME is available
979 if (home_directory(Result)) {
980 append(Result, ".cache");
987 static const char *getEnvTempDir() {
988 // Check whether the temporary directory is specified by an environment
990 const char *EnvironmentVariables[] = {"TMPDIR", "TMP", "TEMP", "TEMPDIR"};
991 for (const char *Env : EnvironmentVariables) {
992 if (const char *Dir = std::getenv(Env))
999 static const char *getDefaultTempDir(bool ErasedOnReboot) {
1010 void system_temp_directory(bool ErasedOnReboot, SmallVectorImpl<char> &Result) {
1013 if (ErasedOnReboot) {
1014 // There is no env variable for the cache directory.
1015 if (const char *RequestedDir = getEnvTempDir()) {
1016 Result.append(RequestedDir, RequestedDir + strlen(RequestedDir));
1021 if (getDarwinConfDir(ErasedOnReboot, Result))
1024 const char *RequestedDir = getDefaultTempDir(ErasedOnReboot);
1025 Result.append(RequestedDir, RequestedDir + strlen(RequestedDir));
1028 } // end namespace path
1030 } // end namespace sys
1031 } // end namespace llvm