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