diff options
Diffstat (limited to 'contrib/llvm/lib/Support/Unix/PathV2.inc')
| -rw-r--r-- | contrib/llvm/lib/Support/Unix/PathV2.inc | 693 |
1 files changed, 0 insertions, 693 deletions
diff --git a/contrib/llvm/lib/Support/Unix/PathV2.inc b/contrib/llvm/lib/Support/Unix/PathV2.inc deleted file mode 100644 index 7e0aead..0000000 --- a/contrib/llvm/lib/Support/Unix/PathV2.inc +++ /dev/null @@ -1,693 +0,0 @@ -//===- llvm/Support/Unix/PathV2.cpp - Unix Path Implementation --*- C++ -*-===// -// -// The LLVM Compiler Infrastructure -// -// This file is distributed under the University of Illinois Open Source -// License. See LICENSE.TXT for details. -// -//===----------------------------------------------------------------------===// -// -// This file implements the Unix specific implementation of the PathV2 API. -// -//===----------------------------------------------------------------------===// - -//===----------------------------------------------------------------------===// -//=== WARNING: Implementation here must contain only generic UNIX code that -//=== is guaranteed to work on *all* UNIX variants. -//===----------------------------------------------------------------------===// - -#include "Unix.h" -#include "llvm/Support/Process.h" -#if HAVE_SYS_STAT_H -#include <sys/stat.h> -#endif -#if HAVE_FCNTL_H -#include <fcntl.h> -#endif -#ifdef HAVE_SYS_MMAN_H -#include <sys/mman.h> -#endif -#if HAVE_DIRENT_H -# include <dirent.h> -# define NAMLEN(dirent) strlen((dirent)->d_name) -#else -# define dirent direct -# define NAMLEN(dirent) (dirent)->d_namlen -# if HAVE_SYS_NDIR_H -# include <sys/ndir.h> -# endif -# if HAVE_SYS_DIR_H -# include <sys/dir.h> -# endif -# if HAVE_NDIR_H -# include <ndir.h> -# endif -#endif -#if HAVE_STDIO_H -#include <stdio.h> -#endif -#if HAVE_LIMITS_H -#include <limits.h> -#endif - -// Both stdio.h and cstdio are included via different pathes and -// stdcxx's cstdio doesn't include stdio.h, so it doesn't #undef the macros -// either. -#undef ferror -#undef feof - -// For GNU Hurd -#if defined(__GNU__) && !defined(PATH_MAX) -# define PATH_MAX 4096 -#endif - -using namespace llvm; - -namespace { - /// This class automatically closes the given file descriptor when it goes out - /// of scope. You can take back explicit ownership of the file descriptor by - /// calling take(). The destructor does not verify that close was successful. - /// Therefore, never allow this class to call close on a file descriptor that - /// has been read from or written to. - struct AutoFD { - int FileDescriptor; - - AutoFD(int fd) : FileDescriptor(fd) {} - ~AutoFD() { - if (FileDescriptor >= 0) - ::close(FileDescriptor); - } - - int take() { - int ret = FileDescriptor; - FileDescriptor = -1; - return ret; - } - - operator int() const {return FileDescriptor;} - }; - - error_code TempDir(SmallVectorImpl<char> &result) { - // FIXME: Don't use TMPDIR if program is SUID or SGID enabled. - const char *dir = 0; - (dir = std::getenv("TMPDIR" )) || - (dir = std::getenv("TMP" )) || - (dir = std::getenv("TEMP" )) || - (dir = std::getenv("TEMPDIR")) || -#ifdef P_tmpdir - (dir = P_tmpdir) || -#endif - (dir = "/tmp"); - - result.clear(); - StringRef d(dir); - result.append(d.begin(), d.end()); - return error_code::success(); - } -} - -namespace llvm { -namespace sys { -namespace fs { - -error_code current_path(SmallVectorImpl<char> &result) { -#ifdef MAXPATHLEN - result.reserve(MAXPATHLEN); -#else -// For GNU Hurd - result.reserve(1024); -#endif - - while (true) { - if (::getcwd(result.data(), result.capacity()) == 0) { - // See if there was a real error. - if (errno != errc::not_enough_memory) - return error_code(errno, system_category()); - // Otherwise there just wasn't enough space. - result.reserve(result.capacity() * 2); - } else - break; - } - - result.set_size(strlen(result.data())); - return error_code::success(); -} - -error_code copy_file(const Twine &from, const Twine &to, copy_option copt) { - // Get arguments. - SmallString<128> from_storage; - SmallString<128> to_storage; - StringRef f = from.toNullTerminatedStringRef(from_storage); - StringRef t = to.toNullTerminatedStringRef(to_storage); - - const size_t buf_sz = 32768; - char buffer[buf_sz]; - int from_file = -1, to_file = -1; - - // Open from. - if ((from_file = ::open(f.begin(), O_RDONLY)) < 0) - return error_code(errno, system_category()); - AutoFD from_fd(from_file); - - // Stat from. - struct stat from_stat; - if (::stat(f.begin(), &from_stat) != 0) - return error_code(errno, system_category()); - - // Setup to flags. - int to_flags = O_CREAT | O_WRONLY; - if (copt == copy_option::fail_if_exists) - to_flags |= O_EXCL; - - // Open to. - if ((to_file = ::open(t.begin(), to_flags, from_stat.st_mode)) < 0) - return error_code(errno, system_category()); - AutoFD to_fd(to_file); - - // Copy! - ssize_t sz, sz_read = 1, sz_write; - while (sz_read > 0 && - (sz_read = ::read(from_fd, buffer, buf_sz)) > 0) { - // Allow for partial writes - see Advanced Unix Programming (2nd Ed.), - // Marc Rochkind, Addison-Wesley, 2004, page 94 - sz_write = 0; - do { - if ((sz = ::write(to_fd, buffer + sz_write, sz_read - sz_write)) < 0) { - sz_read = sz; // cause read loop termination. - break; // error. - } - sz_write += sz; - } while (sz_write < sz_read); - } - - // After all the file operations above the return value of close actually - // matters. - if (::close(from_fd.take()) < 0) sz_read = -1; - if (::close(to_fd.take()) < 0) sz_read = -1; - - // Check for errors. - if (sz_read < 0) - return error_code(errno, system_category()); - - return error_code::success(); -} - -error_code create_directory(const Twine &path, bool &existed) { - SmallString<128> path_storage; - StringRef p = path.toNullTerminatedStringRef(path_storage); - - if (::mkdir(p.begin(), S_IRWXU | S_IRWXG) == -1) { - if (errno != errc::file_exists) - return error_code(errno, system_category()); - existed = true; - } else - existed = false; - - return error_code::success(); -} - -error_code create_hard_link(const Twine &to, const Twine &from) { - // Get arguments. - SmallString<128> from_storage; - SmallString<128> to_storage; - StringRef f = from.toNullTerminatedStringRef(from_storage); - StringRef t = to.toNullTerminatedStringRef(to_storage); - - if (::link(t.begin(), f.begin()) == -1) - return error_code(errno, system_category()); - - return error_code::success(); -} - -error_code create_symlink(const Twine &to, const Twine &from) { - // Get arguments. - SmallString<128> from_storage; - SmallString<128> to_storage; - StringRef f = from.toNullTerminatedStringRef(from_storage); - StringRef t = to.toNullTerminatedStringRef(to_storage); - - if (::symlink(t.begin(), f.begin()) == -1) - return error_code(errno, system_category()); - - return error_code::success(); -} - -error_code remove(const Twine &path, bool &existed) { - SmallString<128> path_storage; - StringRef p = path.toNullTerminatedStringRef(path_storage); - - if (::remove(p.begin()) == -1) { - if (errno != errc::no_such_file_or_directory) - return error_code(errno, system_category()); - existed = false; - } else - existed = true; - - return error_code::success(); -} - -error_code rename(const Twine &from, const Twine &to) { - // Get arguments. - SmallString<128> from_storage; - SmallString<128> to_storage; - StringRef f = from.toNullTerminatedStringRef(from_storage); - StringRef t = to.toNullTerminatedStringRef(to_storage); - - if (::rename(f.begin(), t.begin()) == -1) { - // If it's a cross device link, copy then delete, otherwise return the error - if (errno == EXDEV) { - if (error_code ec = copy_file(from, to, copy_option::overwrite_if_exists)) - return ec; - bool Existed; - if (error_code ec = remove(from, Existed)) - return ec; - } else - return error_code(errno, system_category()); - } - - return error_code::success(); -} - -error_code resize_file(const Twine &path, uint64_t size) { - SmallString<128> path_storage; - StringRef p = path.toNullTerminatedStringRef(path_storage); - - if (::truncate(p.begin(), size) == -1) - return error_code(errno, system_category()); - - return error_code::success(); -} - -error_code exists(const Twine &path, bool &result) { - SmallString<128> path_storage; - StringRef p = path.toNullTerminatedStringRef(path_storage); - - if (::access(p.begin(), F_OK) == -1) { - if (errno != errc::no_such_file_or_directory) - return error_code(errno, system_category()); - result = false; - } else - result = true; - - return error_code::success(); -} - -bool equivalent(file_status A, file_status B) { - assert(status_known(A) && status_known(B)); - return A.fs_st_dev == B.fs_st_dev && - A.fs_st_ino == B.fs_st_ino; -} - -error_code equivalent(const Twine &A, const Twine &B, bool &result) { - file_status fsA, fsB; - if (error_code ec = status(A, fsA)) return ec; - if (error_code ec = status(B, fsB)) return ec; - result = equivalent(fsA, fsB); - return error_code::success(); -} - -error_code file_size(const Twine &path, uint64_t &result) { - SmallString<128> path_storage; - StringRef p = path.toNullTerminatedStringRef(path_storage); - - struct stat status; - if (::stat(p.begin(), &status) == -1) - return error_code(errno, system_category()); - if (!S_ISREG(status.st_mode)) - return make_error_code(errc::operation_not_permitted); - - result = status.st_size; - return error_code::success(); -} - -error_code status(const Twine &path, file_status &result) { - SmallString<128> path_storage; - StringRef p = path.toNullTerminatedStringRef(path_storage); - - struct stat status; - if (::stat(p.begin(), &status) != 0) { - error_code ec(errno, system_category()); - if (ec == errc::no_such_file_or_directory) - result = file_status(file_type::file_not_found); - else - result = file_status(file_type::status_error); - return ec; - } - - perms prms = static_cast<perms>(status.st_mode & perms_mask); - - if (S_ISDIR(status.st_mode)) - result = file_status(file_type::directory_file, prms); - else if (S_ISREG(status.st_mode)) - result = file_status(file_type::regular_file, prms); - else if (S_ISBLK(status.st_mode)) - result = file_status(file_type::block_file, prms); - else if (S_ISCHR(status.st_mode)) - result = file_status(file_type::character_file, prms); - else if (S_ISFIFO(status.st_mode)) - result = file_status(file_type::fifo_file, prms); - else if (S_ISSOCK(status.st_mode)) - result = file_status(file_type::socket_file, prms); - else - result = file_status(file_type::type_unknown, prms); - - result.fs_st_dev = status.st_dev; - result.fs_st_ino = status.st_ino; - - return error_code::success(); -} - -// Modifies permissions on a file. -error_code permissions(const Twine &path, perms prms) { - if ((prms & add_perms) && (prms & remove_perms)) - llvm_unreachable("add_perms and remove_perms are mutually exclusive"); - - // Get current permissions - file_status info; - if (error_code ec = status(path, info)) { - return ec; - } - - // Set updated permissions. - SmallString<128> path_storage; - StringRef p = path.toNullTerminatedStringRef(path_storage); - perms permsToSet; - if (prms & add_perms) { - permsToSet = (info.permissions() | prms) & perms_mask; - } else if (prms & remove_perms) { - permsToSet = (info.permissions() & ~prms) & perms_mask; - } else { - permsToSet = prms & perms_mask; - } - if (::chmod(p.begin(), static_cast<mode_t>(permsToSet))) { - return error_code(errno, system_category()); - } - - return error_code::success(); -} - -// Since this is most often used for temporary files, mode defaults to 0600. -error_code unique_file(const Twine &model, int &result_fd, - SmallVectorImpl<char> &result_path, - bool makeAbsolute, unsigned mode) { - SmallString<128> Model; - model.toVector(Model); - // Null terminate. - Model.c_str(); - - if (makeAbsolute) { - // Make model absolute by prepending a temp directory if it's not already. - bool absolute = path::is_absolute(Twine(Model)); - if (!absolute) { - SmallString<128> TDir; - if (error_code ec = TempDir(TDir)) return ec; - path::append(TDir, Twine(Model)); - Model.swap(TDir); - } - } - - // From here on, DO NOT modify model. It may be needed if the randomly chosen - // path already exists. - SmallString<128> RandomPath = Model; - -retry_random_path: - // Replace '%' with random chars. - for (unsigned i = 0, e = Model.size(); i != e; ++i) { - if (Model[i] == '%') - RandomPath[i] = "0123456789abcdef"[sys::Process::GetRandomNumber() & 15]; - } - - // Make sure we don't fall into an infinite loop by constantly trying - // to create the parent path. - bool TriedToCreateParent = false; - - // Try to open + create the file. -rety_open_create: - int RandomFD = ::open(RandomPath.c_str(), O_RDWR | O_CREAT | O_EXCL, mode); - if (RandomFD == -1) { - int SavedErrno = errno; - // If the file existed, try again, otherwise, error. - if (SavedErrno == errc::file_exists) - goto retry_random_path; - // If path prefix doesn't exist, try to create it. - if (SavedErrno == errc::no_such_file_or_directory && !TriedToCreateParent) { - TriedToCreateParent = true; - StringRef p(RandomPath); - SmallString<64> dir_to_create; - for (path::const_iterator i = path::begin(p), - e = --path::end(p); i != e; ++i) { - path::append(dir_to_create, *i); - bool Exists; - if (error_code ec = exists(Twine(dir_to_create), Exists)) return ec; - if (!Exists) { - // Don't try to create network paths. - if (i->size() > 2 && (*i)[0] == '/' && - (*i)[1] == '/' && - (*i)[2] != '/') - return make_error_code(errc::no_such_file_or_directory); - if (::mkdir(dir_to_create.c_str(), 0700) == -1 && - errno != errc::file_exists) - return error_code(errno, system_category()); - } - } - goto rety_open_create; - } - - return error_code(SavedErrno, system_category()); - } - - // Make the path absolute. - char real_path_buff[PATH_MAX + 1]; - if (realpath(RandomPath.c_str(), real_path_buff) == NULL) { - int error = errno; - ::close(RandomFD); - ::unlink(RandomPath.c_str()); - return error_code(error, system_category()); - } - - result_path.clear(); - StringRef d(real_path_buff); - result_path.append(d.begin(), d.end()); - - result_fd = RandomFD; - return error_code::success(); -} - -error_code mapped_file_region::init(int FD, bool CloseFD, uint64_t Offset) { - AutoFD ScopedFD(FD); - if (!CloseFD) - ScopedFD.take(); - - // Figure out how large the file is. - struct stat FileInfo; - if (fstat(FD, &FileInfo) == -1) - return error_code(errno, system_category()); - uint64_t FileSize = FileInfo.st_size; - - if (Size == 0) - Size = FileSize; - else if (FileSize < Size) { - // We need to grow the file. - if (ftruncate(FD, Size) == -1) - return error_code(errno, system_category()); - } - - int flags = (Mode == readwrite) ? MAP_SHARED : MAP_PRIVATE; - int prot = (Mode == readonly) ? PROT_READ : (PROT_READ | PROT_WRITE); -#ifdef MAP_FILE - flags |= MAP_FILE; -#endif - Mapping = ::mmap(0, Size, prot, flags, FD, Offset); - if (Mapping == MAP_FAILED) - return error_code(errno, system_category()); - return error_code::success(); -} - -mapped_file_region::mapped_file_region(const Twine &path, - mapmode mode, - uint64_t length, - uint64_t offset, - error_code &ec) - : Mode(mode) - , Size(length) - , Mapping() { - // Make sure that the requested size fits within SIZE_T. - if (length > std::numeric_limits<size_t>::max()) { - ec = make_error_code(errc::invalid_argument); - return; - } - - SmallString<128> path_storage; - StringRef name = path.toNullTerminatedStringRef(path_storage); - int oflags = (mode == readonly) ? O_RDONLY : O_RDWR; - int ofd = ::open(name.begin(), oflags); - if (ofd == -1) { - ec = error_code(errno, system_category()); - return; - } - - ec = init(ofd, true, offset); - if (ec) - Mapping = 0; -} - -mapped_file_region::mapped_file_region(int fd, - bool closefd, - mapmode mode, - uint64_t length, - uint64_t offset, - error_code &ec) - : Mode(mode) - , Size(length) - , Mapping() { - // Make sure that the requested size fits within SIZE_T. - if (length > std::numeric_limits<size_t>::max()) { - ec = make_error_code(errc::invalid_argument); - return; - } - - ec = init(fd, closefd, offset); - if (ec) - Mapping = 0; -} - -mapped_file_region::~mapped_file_region() { - if (Mapping) - ::munmap(Mapping, Size); -} - -#if LLVM_HAS_RVALUE_REFERENCES -mapped_file_region::mapped_file_region(mapped_file_region &&other) - : Mode(other.Mode), Size(other.Size), Mapping(other.Mapping) { - other.Mapping = 0; -} -#endif - -mapped_file_region::mapmode mapped_file_region::flags() const { - assert(Mapping && "Mapping failed but used anyway!"); - return Mode; -} - -uint64_t mapped_file_region::size() const { - assert(Mapping && "Mapping failed but used anyway!"); - return Size; -} - -char *mapped_file_region::data() const { - assert(Mapping && "Mapping failed but used anyway!"); - assert(Mode != readonly && "Cannot get non const data for readonly mapping!"); - return reinterpret_cast<char*>(Mapping); -} - -const char *mapped_file_region::const_data() const { - assert(Mapping && "Mapping failed but used anyway!"); - return reinterpret_cast<const char*>(Mapping); -} - -int mapped_file_region::alignment() { - return process::get_self()->page_size(); -} - -error_code detail::directory_iterator_construct(detail::DirIterState &it, - StringRef path){ - SmallString<128> path_null(path); - DIR *directory = ::opendir(path_null.c_str()); - if (directory == 0) - return error_code(errno, system_category()); - - it.IterationHandle = reinterpret_cast<intptr_t>(directory); - // Add something for replace_filename to replace. - path::append(path_null, "."); - it.CurrentEntry = directory_entry(path_null.str()); - return directory_iterator_increment(it); -} - -error_code detail::directory_iterator_destruct(detail::DirIterState &it) { - if (it.IterationHandle) - ::closedir(reinterpret_cast<DIR *>(it.IterationHandle)); - it.IterationHandle = 0; - it.CurrentEntry = directory_entry(); - return error_code::success(); -} - -error_code detail::directory_iterator_increment(detail::DirIterState &it) { - errno = 0; - dirent *cur_dir = ::readdir(reinterpret_cast<DIR *>(it.IterationHandle)); - if (cur_dir == 0 && errno != 0) { - return error_code(errno, system_category()); - } else if (cur_dir != 0) { - StringRef name(cur_dir->d_name, NAMLEN(cur_dir)); - if ((name.size() == 1 && name[0] == '.') || - (name.size() == 2 && name[0] == '.' && name[1] == '.')) - return directory_iterator_increment(it); - it.CurrentEntry.replace_filename(name); - } else - return directory_iterator_destruct(it); - - return error_code::success(); -} - -error_code get_magic(const Twine &path, uint32_t len, - SmallVectorImpl<char> &result) { - SmallString<128> PathStorage; - StringRef Path = path.toNullTerminatedStringRef(PathStorage); - result.set_size(0); - - // Open path. - std::FILE *file = std::fopen(Path.data(), "rb"); - if (file == 0) - return error_code(errno, system_category()); - - // Reserve storage. - result.reserve(len); - - // Read magic! - size_t size = std::fread(result.data(), 1, len, file); - if (std::ferror(file) != 0) { - std::fclose(file); - return error_code(errno, system_category()); - } else if (size != result.size()) { - if (std::feof(file) != 0) { - std::fclose(file); - result.set_size(size); - return make_error_code(errc::value_too_large); - } - } - std::fclose(file); - result.set_size(len); - return error_code::success(); -} - -error_code map_file_pages(const Twine &path, off_t file_offset, size_t size, - bool map_writable, void *&result) { - SmallString<128> path_storage; - StringRef name = path.toNullTerminatedStringRef(path_storage); - int oflags = map_writable ? O_RDWR : O_RDONLY; - int ofd = ::open(name.begin(), oflags); - if ( ofd == -1 ) - return error_code(errno, system_category()); - AutoFD fd(ofd); - int flags = map_writable ? MAP_SHARED : MAP_PRIVATE; - int prot = map_writable ? (PROT_READ|PROT_WRITE) : PROT_READ; -#ifdef MAP_FILE - flags |= MAP_FILE; -#endif - result = ::mmap(0, size, prot, flags, fd, file_offset); - if (result == MAP_FAILED) { - return error_code(errno, system_category()); - } - - return error_code::success(); -} - -error_code unmap_file_pages(void *base, size_t size) { - if ( ::munmap(base, size) == -1 ) - return error_code(errno, system_category()); - - return error_code::success(); -} - - -} // end namespace fs -} // end namespace sys -} // end namespace llvm |
