//===----------------------------------------------------------------------===//
#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
+#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
+
+// 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 path {
+namespace fs {
error_code current_path(SmallVectorImpl<char> &result) {
- long size = ::pathconf(".", _PC_PATH_MAX);
- result.reserve(size + 1);
- result.set_size(size + 1);
+#ifdef MAXPATHLEN
+ result.reserve(MAXPATHLEN);
+#else
+// For GNU Hurd
+ result.reserve(1024);
+#endif
- if (::getcwd(result.data(), result.size()) == 0)
- return error_code(errno, system_category());
+ 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 make_error_code(errc::success);
+ 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);
+
+ struct stat status;
+ if (::stat(p.begin(), &status) == -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;
+ }
+
+ if (S_ISDIR(status.st_mode))
+ result = file_status(file_type::directory_file);
+ else if (S_ISREG(status.st_mode))
+ result = file_status(file_type::regular_file);
+ else if (S_ISBLK(status.st_mode))
+ result = file_status(file_type::block_file);
+ else if (S_ISCHR(status.st_mode))
+ result = file_status(file_type::character_file);
+ else if (S_ISFIFO(status.st_mode))
+ result = file_status(file_type::fifo_file);
+ else if (S_ISSOCK(status.st_mode))
+ result = file_status(file_type::socket_file);
+ else
+ result = file_status(file_type::type_unknown);
+
+ result.fs_st_dev = status.st_dev;
+ result.fs_st_ino = status.st_ino;
+
+ return error_code::success();
+}
+
+error_code unique_file(const Twine &model, int &result_fd,
+ SmallVectorImpl<char> &result_path,
+ bool makeAbsolute) {
+ 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);
+ }
+ }
+
+ // Replace '%' with random chars. 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:
+ // This is opened here instead of above to make it easier to track when to
+ // close it. Collisions should be rare enough for the possible extra syscalls
+ // not to matter.
+ for (unsigned i = 0, e = Model.size(); i != e; ++i) {
+ if (Model[i] == '%')
+ RandomPath[i] = "0123456789abcdef"[sys::Process::GetRandomNumber() & 15];
+ }
+
+ // Try to open + create the file.
+rety_open_create:
+ int RandomFD = ::open(RandomPath.c_str(), O_RDWR | O_CREAT | O_EXCL, 0600);
+ if (RandomFD == -1) {
+ // If the file existed, try again, otherwise, error.
+ if (errno == errc::file_exists)
+ goto retry_random_path;
+ // The path prefix doesn't exist.
+ if (errno == errc::no_such_file_or_directory) {
+ StringRef p(RandomPath.begin(), RandomPath.size());
+ 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)
+ return error_code(errno, system_category());
+ }
+ }
+ goto rety_open_create;
+ }
+ return error_code(errno, 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 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();
}
-} // end namespace path
+} // end namespace fs
} // end namespace sys
} // end namespace llvm
projects / oota-llvm.git / blobdiff