Move file_util to base/files/ directory.

base/file_util_posix.cc

Index: base/file_util_posix.cc
diff --git a/base/file_util_posix.cc b/base/file_util_posix.cc
deleted file mode 100644
index 92e8cad16054330b0c6e321bcbd409e7e88be833..0000000000000000000000000000000000000000
--- a/base/file_util_posix.cc
+++ /dev/null
@@ -1,912 +0,0 @@
-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "base/file_util.h"
-
-#include <dirent.h>
-#include <errno.h>
-#include <fcntl.h>
-#include <libgen.h>
-#include <limits.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/errno.h>
-#include <sys/mman.h>
-#include <sys/param.h>
-#include <sys/stat.h>
-#include <sys/time.h>
-#include <sys/types.h>
-#include <time.h>
-#include <unistd.h>
-
-#if defined(OS_MACOSX)
-#include <AvailabilityMacros.h>
-#include "base/mac/foundation_util.h"
-#elif !defined(OS_CHROMEOS) && defined(USE_GLIB)
-#include <glib.h>  // for g_get_home_dir()
-#endif
-
-#include <fstream>
-
-#include "base/basictypes.h"
-#include "base/files/file_enumerator.h"
-#include "base/files/file_path.h"
-#include "base/files/scoped_file.h"
-#include "base/logging.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/memory/singleton.h"
-#include "base/path_service.h"
-#include "base/posix/eintr_wrapper.h"
-#include "base/stl_util.h"
-#include "base/strings/string_util.h"
-#include "base/strings/stringprintf.h"
-#include "base/strings/sys_string_conversions.h"
-#include "base/strings/utf_string_conversions.h"
-#include "base/sys_info.h"
-#include "base/threading/thread_restrictions.h"
-#include "base/time/time.h"
-
-#if defined(OS_ANDROID)
-#include "base/android/content_uri_utils.h"
-#include "base/os_compat_android.h"
-#endif
-
-#if !defined(OS_IOS)
-#include <grp.h>
-#endif
-
-namespace base {
-
-namespace {
-
-#if defined(OS_BSD) || defined(OS_MACOSX) || defined(OS_NACL)
-static int CallStat(const char *path, stat_wrapper_t *sb) {
-  ThreadRestrictions::AssertIOAllowed();
-  return stat(path, sb);
-}
-static int CallLstat(const char *path, stat_wrapper_t *sb) {
-  ThreadRestrictions::AssertIOAllowed();
-  return lstat(path, sb);
-}
-#else  //  defined(OS_BSD) || defined(OS_MACOSX) || defined(OS_NACL)
-static int CallStat(const char *path, stat_wrapper_t *sb) {
-  ThreadRestrictions::AssertIOAllowed();
-  return stat64(path, sb);
-}
-static int CallLstat(const char *path, stat_wrapper_t *sb) {
-  ThreadRestrictions::AssertIOAllowed();
-  return lstat64(path, sb);
-}
-#endif  // !(defined(OS_BSD) || defined(OS_MACOSX) || defined(OS_NACL))
-
-// Helper for NormalizeFilePath(), defined below.
-bool RealPath(const FilePath& path, FilePath* real_path) {
-  ThreadRestrictions::AssertIOAllowed();  // For realpath().
-  FilePath::CharType buf[PATH_MAX];
-  if (!realpath(path.value().c_str(), buf))
-    return false;
-
-  *real_path = FilePath(buf);
-  return true;
-}
-
-// Helper for VerifyPathControlledByUser.
-bool VerifySpecificPathControlledByUser(const FilePath& path,
-                                        uid_t owner_uid,
-                                        const std::set<gid_t>& group_gids) {
-  stat_wrapper_t stat_info;
-  if (CallLstat(path.value().c_str(), &stat_info) != 0) {
-    DPLOG(ERROR) << "Failed to get information on path "
-                 << path.value();
-    return false;
-  }
-
-  if (S_ISLNK(stat_info.st_mode)) {
-    DLOG(ERROR) << "Path " << path.value()
-               << " is a symbolic link.";
-    return false;
-  }
-
-  if (stat_info.st_uid != owner_uid) {
-    DLOG(ERROR) << "Path " << path.value()
-                << " is owned by the wrong user.";
-    return false;
-  }
-
-  if ((stat_info.st_mode & S_IWGRP) &&
-      !ContainsKey(group_gids, stat_info.st_gid)) {
-    DLOG(ERROR) << "Path " << path.value()
-                << " is writable by an unprivileged group.";
-    return false;
-  }
-
-  if (stat_info.st_mode & S_IWOTH) {
-    DLOG(ERROR) << "Path " << path.value()
-                << " is writable by any user.";
-    return false;
-  }
-
-  return true;
-}
-
-std::string TempFileName() {
-#if defined(OS_MACOSX)
-  return StringPrintf(".%s.XXXXXX", base::mac::BaseBundleID());
-#endif
-
-#if defined(GOOGLE_CHROME_BUILD)
-  return std::string(".com.google.Chrome.XXXXXX");
-#else
-  return std::string(".org.chromium.Chromium.XXXXXX");
-#endif
-}
-
-// Creates and opens a temporary file in |directory|, returning the
-// file descriptor. |path| is set to the temporary file path.
-// This function does NOT unlink() the file.
-int CreateAndOpenFdForTemporaryFile(FilePath directory, FilePath* path) {
-  ThreadRestrictions::AssertIOAllowed();  // For call to mkstemp().
-  *path = directory.Append(base::TempFileName());
-  const std::string& tmpdir_string = path->value();
-  // this should be OK since mkstemp just replaces characters in place
-  char* buffer = const_cast<char*>(tmpdir_string.c_str());
-
-  return HANDLE_EINTR(mkstemp(buffer));
-}
-
-#if defined(OS_LINUX)
-// Determine if /dev/shm files can be mapped and then mprotect'd PROT_EXEC.
-// This depends on the mount options used for /dev/shm, which vary among
-// different Linux distributions and possibly local configuration.  It also
-// depends on details of kernel--ChromeOS uses the noexec option for /dev/shm
-// but its kernel allows mprotect with PROT_EXEC anyway.
-bool DetermineDevShmExecutable() {
-  bool result = false;
-  FilePath path;
-
-  ScopedFD fd(CreateAndOpenFdForTemporaryFile(FilePath("/dev/shm"), &path));
-  if (fd.is_valid()) {
-    DeleteFile(path, false);
-    long sysconf_result = sysconf(_SC_PAGESIZE);
-    CHECK_GE(sysconf_result, 0);
-    size_t pagesize = static_cast<size_t>(sysconf_result);
-    CHECK_GE(sizeof(pagesize), sizeof(sysconf_result));
-    void* mapping = mmap(NULL, pagesize, PROT_READ, MAP_SHARED, fd.get(), 0);
-    if (mapping != MAP_FAILED) {
-      if (mprotect(mapping, pagesize, PROT_READ | PROT_EXEC) == 0)
-        result = true;
-      munmap(mapping, pagesize);
-    }
-  }
-  return result;
-}
-#endif  // defined(OS_LINUX)
-
-}  // namespace
-
-FilePath MakeAbsoluteFilePath(const FilePath& input) {
-  ThreadRestrictions::AssertIOAllowed();
-  char full_path[PATH_MAX];
-  if (realpath(input.value().c_str(), full_path) == NULL)
-    return FilePath();
-  return FilePath(full_path);
-}
-
-// TODO(erikkay): The Windows version of this accepts paths like "foo/bar/*"
-// which works both with and without the recursive flag.  I'm not sure we need
-// that functionality. If not, remove from file_util_win.cc, otherwise add it
-// here.
-bool DeleteFile(const FilePath& path, bool recursive) {
-  ThreadRestrictions::AssertIOAllowed();
-  const char* path_str = path.value().c_str();
-  stat_wrapper_t file_info;
-  int test = CallLstat(path_str, &file_info);
-  if (test != 0) {
-    // The Windows version defines this condition as success.
-    bool ret = (errno == ENOENT || errno == ENOTDIR);
-    return ret;
-  }
-  if (!S_ISDIR(file_info.st_mode))
-    return (unlink(path_str) == 0);
-  if (!recursive)
-    return (rmdir(path_str) == 0);
-
-  bool success = true;
-  std::stack<std::string> directories;
-  directories.push(path.value());
-  FileEnumerator traversal(path, true,
-      FileEnumerator::FILES | FileEnumerator::DIRECTORIES |
-      FileEnumerator::SHOW_SYM_LINKS);
-  for (FilePath current = traversal.Next(); success && !current.empty();
-       current = traversal.Next()) {
-    if (traversal.GetInfo().IsDirectory())
-      directories.push(current.value());
-    else
-      success = (unlink(current.value().c_str()) == 0);
-  }
-
-  while (success && !directories.empty()) {
-    FilePath dir = FilePath(directories.top());
-    directories.pop();
-    success = (rmdir(dir.value().c_str()) == 0);
-  }
-  return success;
-}
-
-bool ReplaceFile(const FilePath& from_path,
-                 const FilePath& to_path,
-                 File::Error* error) {
-  ThreadRestrictions::AssertIOAllowed();
-  if (rename(from_path.value().c_str(), to_path.value().c_str()) == 0)
-    return true;
-  if (error)
-    *error = File::OSErrorToFileError(errno);
-  return false;
-}
-
-bool CopyDirectory(const FilePath& from_path,
-                   const FilePath& to_path,
-                   bool recursive) {
-  ThreadRestrictions::AssertIOAllowed();
-  // Some old callers of CopyDirectory want it to support wildcards.
-  // After some discussion, we decided to fix those callers.
-  // Break loudly here if anyone tries to do this.
-  DCHECK(to_path.value().find('*') == std::string::npos);
-  DCHECK(from_path.value().find('*') == std::string::npos);
-
-  if (from_path.value().size() >= PATH_MAX) {
-    return false;
-  }
-
-  // This function does not properly handle destinations within the source
-  FilePath real_to_path = to_path;
-  if (PathExists(real_to_path)) {
-    real_to_path = MakeAbsoluteFilePath(real_to_path);
-    if (real_to_path.empty())
-      return false;
-  } else {
-    real_to_path = MakeAbsoluteFilePath(real_to_path.DirName());
-    if (real_to_path.empty())
-      return false;
-  }
-  FilePath real_from_path = MakeAbsoluteFilePath(from_path);
-  if (real_from_path.empty())
-    return false;
-  if (real_to_path.value().size() >= real_from_path.value().size() &&
-      real_to_path.value().compare(0, real_from_path.value().size(),
-                                   real_from_path.value()) == 0) {
-    return false;
-  }
-
-  int traverse_type = FileEnumerator::FILES | FileEnumerator::SHOW_SYM_LINKS;
-  if (recursive)
-    traverse_type |= FileEnumerator::DIRECTORIES;
-  FileEnumerator traversal(from_path, recursive, traverse_type);
-
-  // We have to mimic windows behavior here. |to_path| may not exist yet,
-  // start the loop with |to_path|.
-  struct stat from_stat;
-  FilePath current = from_path;
-  if (stat(from_path.value().c_str(), &from_stat) < 0) {
-    DLOG(ERROR) << "CopyDirectory() couldn't stat source directory: "
-                << from_path.value() << " errno = " << errno;
-    return false;
-  }
-  struct stat to_path_stat;
-  FilePath from_path_base = from_path;
-  if (recursive && stat(to_path.value().c_str(), &to_path_stat) == 0 &&
-      S_ISDIR(to_path_stat.st_mode)) {
-    // If the destination already exists and is a directory, then the
-    // top level of source needs to be copied.
-    from_path_base = from_path.DirName();
-  }
-
-  // The Windows version of this function assumes that non-recursive calls
-  // will always have a directory for from_path.
-  // TODO(maruel): This is not necessary anymore.
-  DCHECK(recursive || S_ISDIR(from_stat.st_mode));
-
-  bool success = true;
-  while (success && !current.empty()) {
-    // current is the source path, including from_path, so append
-    // the suffix after from_path to to_path to create the target_path.
-    FilePath target_path(to_path);
-    if (from_path_base != current) {
-      if (!from_path_base.AppendRelativePath(current, &target_path)) {
-        success = false;
-        break;
-      }
-    }
-
-    if (S_ISDIR(from_stat.st_mode)) {
-      if (mkdir(target_path.value().c_str(), from_stat.st_mode & 01777) != 0 &&
-          errno != EEXIST) {
-        DLOG(ERROR) << "CopyDirectory() couldn't create directory: "
-                    << target_path.value() << " errno = " << errno;
-        success = false;
-      }
-    } else if (S_ISREG(from_stat.st_mode)) {
-      if (!CopyFile(current, target_path)) {
-        DLOG(ERROR) << "CopyDirectory() couldn't create file: "
-                    << target_path.value();
-        success = false;
-      }
-    } else {
-      DLOG(WARNING) << "CopyDirectory() skipping non-regular file: "
-                    << current.value();
-    }
-
-    current = traversal.Next();
-    if (!current.empty())
-      from_stat = traversal.GetInfo().stat();
-  }
-
-  return success;
-}
-
-bool PathExists(const FilePath& path) {
-  ThreadRestrictions::AssertIOAllowed();
-#if defined(OS_ANDROID)
-  if (path.IsContentUri()) {
-    return ContentUriExists(path);
-  }
-#endif
-  return access(path.value().c_str(), F_OK) == 0;
-}
-
-bool PathIsWritable(const FilePath& path) {
-  ThreadRestrictions::AssertIOAllowed();
-  return access(path.value().c_str(), W_OK) == 0;
-}
-
-bool DirectoryExists(const FilePath& path) {
-  ThreadRestrictions::AssertIOAllowed();
-  stat_wrapper_t file_info;
-  if (CallStat(path.value().c_str(), &file_info) == 0)
-    return S_ISDIR(file_info.st_mode);
-  return false;
-}
-
-bool ReadFromFD(int fd, char* buffer, size_t bytes) {
-  size_t total_read = 0;
-  while (total_read < bytes) {
-    ssize_t bytes_read =
-        HANDLE_EINTR(read(fd, buffer + total_read, bytes - total_read));
-    if (bytes_read <= 0)
-      break;
-    total_read += bytes_read;
-  }
-  return total_read == bytes;
-}
-
-bool CreateSymbolicLink(const FilePath& target_path,
-                        const FilePath& symlink_path) {
-  DCHECK(!symlink_path.empty());
-  DCHECK(!target_path.empty());
-  return ::symlink(target_path.value().c_str(),
-                   symlink_path.value().c_str()) != -1;
-}
-
-bool ReadSymbolicLink(const FilePath& symlink_path, FilePath* target_path) {
-  DCHECK(!symlink_path.empty());
-  DCHECK(target_path);
-  char buf[PATH_MAX];
-  ssize_t count = ::readlink(symlink_path.value().c_str(), buf, arraysize(buf));
-
-  if (count <= 0) {
-    target_path->clear();
-    return false;
-  }
-
-  *target_path = FilePath(FilePath::StringType(buf, count));
-  return true;
-}
-
-bool GetPosixFilePermissions(const FilePath& path, int* mode) {
-  ThreadRestrictions::AssertIOAllowed();
-  DCHECK(mode);
-
-  stat_wrapper_t file_info;
-  // Uses stat(), because on symbolic link, lstat() does not return valid
-  // permission bits in st_mode
-  if (CallStat(path.value().c_str(), &file_info) != 0)
-    return false;
-
-  *mode = file_info.st_mode & FILE_PERMISSION_MASK;
-  return true;
-}
-
-bool SetPosixFilePermissions(const FilePath& path,
-                             int mode) {
-  ThreadRestrictions::AssertIOAllowed();
-  DCHECK((mode & ~FILE_PERMISSION_MASK) == 0);
-
-  // Calls stat() so that we can preserve the higher bits like S_ISGID.
-  stat_wrapper_t stat_buf;
-  if (CallStat(path.value().c_str(), &stat_buf) != 0)
-    return false;
-
-  // Clears the existing permission bits, and adds the new ones.
-  mode_t updated_mode_bits = stat_buf.st_mode & ~FILE_PERMISSION_MASK;
-  updated_mode_bits |= mode & FILE_PERMISSION_MASK;
-
-  if (HANDLE_EINTR(chmod(path.value().c_str(), updated_mode_bits)) != 0)
-    return false;
-
-  return true;
-}
-
-#if !defined(OS_MACOSX)
-// This is implemented in file_util_mac.mm for Mac.
-bool GetTempDir(FilePath* path) {
-  const char* tmp = getenv("TMPDIR");
-  if (tmp) {
-    *path = FilePath(tmp);
-  } else {
-#if defined(OS_ANDROID)
-    return PathService::Get(base::DIR_CACHE, path);
-#else
-    *path = FilePath("/tmp");
-#endif
-  }
-  return true;
-}
-#endif  // !defined(OS_MACOSX)
-
-#if !defined(OS_MACOSX)  // Mac implementation is in file_util_mac.mm.
-FilePath GetHomeDir() {
-#if defined(OS_CHROMEOS)
-  if (SysInfo::IsRunningOnChromeOS()) {
-    // On Chrome OS chrome::DIR_USER_DATA is overridden with a primary user
-    // homedir once it becomes available. Return / as the safe option.
-    return FilePath("/");
-  }
-#endif
-
-  const char* home_dir = getenv("HOME");
-  if (home_dir && home_dir[0])
-    return FilePath(home_dir);
-
-#if defined(OS_ANDROID)
-  DLOG(WARNING) << "OS_ANDROID: Home directory lookup not yet implemented.";
-#elif defined(USE_GLIB) && !defined(OS_CHROMEOS)
-  // g_get_home_dir calls getpwent, which can fall through to LDAP calls so
-  // this may do I/O. However, it should be rare that $HOME is not defined and
-  // this is typically called from the path service which has no threading
-  // restrictions. The path service will cache the result which limits the
-  // badness of blocking on I/O. As a result, we don't have a thread
-  // restriction here.
-  home_dir = g_get_home_dir();
-  if (home_dir && home_dir[0])
-    return FilePath(home_dir);
-#endif
-
-  FilePath rv;
-  if (GetTempDir(&rv))
-    return rv;
-
-  // Last resort.
-  return FilePath("/tmp");
-}
-#endif  // !defined(OS_MACOSX)
-
-bool CreateTemporaryFile(FilePath* path) {
-  ThreadRestrictions::AssertIOAllowed();  // For call to close().
-  FilePath directory;
-  if (!GetTempDir(&directory))
-    return false;
-  int fd = CreateAndOpenFdForTemporaryFile(directory, path);
-  if (fd < 0)
-    return false;
-  close(fd);
-  return true;
-}
-
-FILE* CreateAndOpenTemporaryFileInDir(const FilePath& dir, FilePath* path) {
-  int fd = CreateAndOpenFdForTemporaryFile(dir, path);
-  if (fd < 0)
-    return NULL;
-
-  FILE* file = fdopen(fd, "a+");
-  if (!file)
-    close(fd);
-  return file;
-}
-
-bool CreateTemporaryFileInDir(const FilePath& dir, FilePath* temp_file) {
-  ThreadRestrictions::AssertIOAllowed();  // For call to close().
-  int fd = CreateAndOpenFdForTemporaryFile(dir, temp_file);
-  return ((fd >= 0) && !IGNORE_EINTR(close(fd)));
-}
-
-static bool CreateTemporaryDirInDirImpl(const FilePath& base_dir,
-                                        const FilePath::StringType& name_tmpl,
-                                        FilePath* new_dir) {
-  ThreadRestrictions::AssertIOAllowed();  // For call to mkdtemp().
-  DCHECK(name_tmpl.find("XXXXXX") != FilePath::StringType::npos)
-      << "Directory name template must contain \"XXXXXX\".";
-
-  FilePath sub_dir = base_dir.Append(name_tmpl);
-  std::string sub_dir_string = sub_dir.value();
-
-  // this should be OK since mkdtemp just replaces characters in place
-  char* buffer = const_cast<char*>(sub_dir_string.c_str());
-  char* dtemp = mkdtemp(buffer);
-  if (!dtemp) {
-    DPLOG(ERROR) << "mkdtemp";
-    return false;
-  }
-  *new_dir = FilePath(dtemp);
-  return true;
-}
-
-bool CreateTemporaryDirInDir(const FilePath& base_dir,
-                             const FilePath::StringType& prefix,
-                             FilePath* new_dir) {
-  FilePath::StringType mkdtemp_template = prefix;
-  mkdtemp_template.append(FILE_PATH_LITERAL("XXXXXX"));
-  return CreateTemporaryDirInDirImpl(base_dir, mkdtemp_template, new_dir);
-}
-
-bool CreateNewTempDirectory(const FilePath::StringType& prefix,
-                            FilePath* new_temp_path) {
-  FilePath tmpdir;
-  if (!GetTempDir(&tmpdir))
-    return false;
-
-  return CreateTemporaryDirInDirImpl(tmpdir, TempFileName(), new_temp_path);
-}
-
-bool CreateDirectoryAndGetError(const FilePath& full_path,
-                                File::Error* error) {
-  ThreadRestrictions::AssertIOAllowed();  // For call to mkdir().
-  std::vector<FilePath> subpaths;
-
-  // Collect a list of all parent directories.
-  FilePath last_path = full_path;
-  subpaths.push_back(full_path);
-  for (FilePath path = full_path.DirName();
-       path.value() != last_path.value(); path = path.DirName()) {
-    subpaths.push_back(path);
-    last_path = path;
-  }
-
-  // Iterate through the parents and create the missing ones.
-  for (std::vector<FilePath>::reverse_iterator i = subpaths.rbegin();
-       i != subpaths.rend(); ++i) {
-    if (DirectoryExists(*i))
-      continue;
-    if (mkdir(i->value().c_str(), 0700) == 0)
-      continue;
-    // Mkdir failed, but it might have failed with EEXIST, or some other error
-    // due to the the directory appearing out of thin air. This can occur if
-    // two processes are trying to create the same file system tree at the same
-    // time. Check to see if it exists and make sure it is a directory.
-    int saved_errno = errno;
-    if (!DirectoryExists(*i)) {
-      if (error)
-        *error = File::OSErrorToFileError(saved_errno);
-      return false;
-    }
-  }
-  return true;
-}
-
-bool NormalizeFilePath(const FilePath& path, FilePath* normalized_path) {
-  FilePath real_path_result;
-  if (!RealPath(path, &real_path_result))
-    return false;
-
-  // To be consistant with windows, fail if |real_path_result| is a
-  // directory.
-  stat_wrapper_t file_info;
-  if (CallStat(real_path_result.value().c_str(), &file_info) != 0 ||
-      S_ISDIR(file_info.st_mode))
-    return false;
-
-  *normalized_path = real_path_result;
-  return true;
-}
-
-// TODO(rkc): Refactor GetFileInfo and FileEnumerator to handle symlinks
-// correctly. http://code.google.com/p/chromium-os/issues/detail?id=15948
-bool IsLink(const FilePath& file_path) {
-  stat_wrapper_t st;
-  // If we can't lstat the file, it's safe to assume that the file won't at
-  // least be a 'followable' link.
-  if (CallLstat(file_path.value().c_str(), &st) != 0)
-    return false;
-
-  if (S_ISLNK(st.st_mode))
-    return true;
-  else
-    return false;
-}
-
-bool GetFileInfo(const FilePath& file_path, File::Info* results) {
-  stat_wrapper_t file_info;
-#if defined(OS_ANDROID)
-  if (file_path.IsContentUri()) {
-    File file = OpenContentUriForRead(file_path);
-    if (!file.IsValid())
-      return false;
-    return file.GetInfo(results);
-  } else {
-#endif  // defined(OS_ANDROID)
-    if (CallStat(file_path.value().c_str(), &file_info) != 0)
-      return false;
-#if defined(OS_ANDROID)
-  }
-#endif  // defined(OS_ANDROID)
-
-  results->FromStat(file_info);
-  return true;
-}
-
-FILE* OpenFile(const FilePath& filename, const char* mode) {
-  ThreadRestrictions::AssertIOAllowed();
-  FILE* result = NULL;
-  do {
-    result = fopen(filename.value().c_str(), mode);
-  } while (!result && errno == EINTR);
-  return result;
-}
-
-// NaCl doesn't implement system calls to open files directly.
-#if !defined(OS_NACL)
-FILE* FileToFILE(File file, const char* mode) {
-  FILE* stream = fdopen(file.GetPlatformFile(), mode);
-  if (stream)
-    file.TakePlatformFile();
-  return stream;
-}
-#endif  // !defined(OS_NACL)
-
-int ReadFile(const FilePath& filename, char* data, int max_size) {
-  ThreadRestrictions::AssertIOAllowed();
-  int fd = HANDLE_EINTR(open(filename.value().c_str(), O_RDONLY));
-  if (fd < 0)
-    return -1;
-
-  ssize_t bytes_read = HANDLE_EINTR(read(fd, data, max_size));
-  if (IGNORE_EINTR(close(fd)) < 0)
-    return -1;
-  return bytes_read;
-}
-
-int WriteFile(const FilePath& filename, const char* data, int size) {
-  ThreadRestrictions::AssertIOAllowed();
-  int fd = HANDLE_EINTR(creat(filename.value().c_str(), 0640));
-  if (fd < 0)
-    return -1;
-
-  int bytes_written = WriteFileDescriptor(fd, data, size);
-  if (IGNORE_EINTR(close(fd)) < 0)
-    return -1;
-  return bytes_written;
-}
-
-int WriteFileDescriptor(const int fd, const char* data, int size) {
-  // Allow for partial writes.
-  ssize_t bytes_written_total = 0;
-  for (ssize_t bytes_written_partial = 0; bytes_written_total < size;
-       bytes_written_total += bytes_written_partial) {
-    bytes_written_partial =
-        HANDLE_EINTR(write(fd, data + bytes_written_total,
-                           size - bytes_written_total));
-    if (bytes_written_partial < 0)
-      return -1;
-  }
-
-  return bytes_written_total;
-}
-
-int AppendToFile(const FilePath& filename, const char* data, int size) {
-  ThreadRestrictions::AssertIOAllowed();
-  int fd = HANDLE_EINTR(open(filename.value().c_str(), O_WRONLY | O_APPEND));
-  if (fd < 0)
-    return -1;
-
-  int bytes_written = WriteFileDescriptor(fd, data, size);
-  if (IGNORE_EINTR(close(fd)) < 0)
-    return -1;
-  return bytes_written;
-}
-
-// Gets the current working directory for the process.
-bool GetCurrentDirectory(FilePath* dir) {
-  // getcwd can return ENOENT, which implies it checks against the disk.
-  ThreadRestrictions::AssertIOAllowed();
-
-  char system_buffer[PATH_MAX] = "";
-  if (!getcwd(system_buffer, sizeof(system_buffer))) {
-    NOTREACHED();
-    return false;
-  }
-  *dir = FilePath(system_buffer);
-  return true;
-}
-
-// Sets the current working directory for the process.
-bool SetCurrentDirectory(const FilePath& path) {
-  ThreadRestrictions::AssertIOAllowed();
-  int ret = chdir(path.value().c_str());
-  return !ret;
-}
-
-bool VerifyPathControlledByUser(const FilePath& base,
-                                const FilePath& path,
-                                uid_t owner_uid,
-                                const std::set<gid_t>& group_gids) {
-  if (base != path && !base.IsParent(path)) {
-     DLOG(ERROR) << "|base| must be a subdirectory of |path|.  base = \""
-                 << base.value() << "\", path = \"" << path.value() << "\"";
-     return false;
-  }
-
-  std::vector<FilePath::StringType> base_components;
-  std::vector<FilePath::StringType> path_components;
-
-  base.GetComponents(&base_components);
-  path.GetComponents(&path_components);
-
-  std::vector<FilePath::StringType>::const_iterator ib, ip;
-  for (ib = base_components.begin(), ip = path_components.begin();
-       ib != base_components.end(); ++ib, ++ip) {
-    // |base| must be a subpath of |path|, so all components should match.
-    // If these CHECKs fail, look at the test that base is a parent of
-    // path at the top of this function.
-    DCHECK(ip != path_components.end());
-    DCHECK(*ip == *ib);
-  }
-
-  FilePath current_path = base;
-  if (!VerifySpecificPathControlledByUser(current_path, owner_uid, group_gids))
-    return false;
-
-  for (; ip != path_components.end(); ++ip) {
-    current_path = current_path.Append(*ip);
-    if (!VerifySpecificPathControlledByUser(
-            current_path, owner_uid, group_gids))
-      return false;
-  }
-  return true;
-}
-
-#if defined(OS_MACOSX) && !defined(OS_IOS)
-bool VerifyPathControlledByAdmin(const FilePath& path) {
-  const unsigned kRootUid = 0;
-  const FilePath kFileSystemRoot("/");
-
-  // The name of the administrator group on mac os.
-  const char* const kAdminGroupNames[] = {
-    "admin",
-    "wheel"
-  };
-
-  // Reading the groups database may touch the file system.
-  ThreadRestrictions::AssertIOAllowed();
-
-  std::set<gid_t> allowed_group_ids;
-  for (int i = 0, ie = arraysize(kAdminGroupNames); i < ie; ++i) {
-    struct group *group_record = getgrnam(kAdminGroupNames[i]);
-    if (!group_record) {
-      DPLOG(ERROR) << "Could not get the group ID of group \""
-                   << kAdminGroupNames[i] << "\".";
-      continue;
-    }
-
-    allowed_group_ids.insert(group_record->gr_gid);
-  }
-
-  return VerifyPathControlledByUser(
-      kFileSystemRoot, path, kRootUid, allowed_group_ids);
-}
-#endif  // defined(OS_MACOSX) && !defined(OS_IOS)
-
-int GetMaximumPathComponentLength(const FilePath& path) {
-  ThreadRestrictions::AssertIOAllowed();
-  return pathconf(path.value().c_str(), _PC_NAME_MAX);
-}
-
-#if !defined(OS_ANDROID)
-// This is implemented in file_util_android.cc for that platform.
-bool GetShmemTempDir(bool executable, FilePath* path) {
-#if defined(OS_LINUX)
-  bool use_dev_shm = true;
-  if (executable) {
-    static const bool s_dev_shm_executable = DetermineDevShmExecutable();
-    use_dev_shm = s_dev_shm_executable;
-  }
-  if (use_dev_shm) {
-    *path = FilePath("/dev/shm");
-    return true;
-  }
-#endif
-  return GetTempDir(path);
-}
-#endif  // !defined(OS_ANDROID)
-
-// -----------------------------------------------------------------------------
-
-namespace internal {
-
-bool MoveUnsafe(const FilePath& from_path, const FilePath& to_path) {
-  ThreadRestrictions::AssertIOAllowed();
-  // Windows compatibility: if to_path exists, from_path and to_path
-  // must be the same type, either both files, or both directories.
-  stat_wrapper_t to_file_info;
-  if (CallStat(to_path.value().c_str(), &to_file_info) == 0) {
-    stat_wrapper_t from_file_info;
-    if (CallStat(from_path.value().c_str(), &from_file_info) == 0) {
-      if (S_ISDIR(to_file_info.st_mode) != S_ISDIR(from_file_info.st_mode))
-        return false;
-    } else {
-      return false;
-    }
-  }
-
-  if (rename(from_path.value().c_str(), to_path.value().c_str()) == 0)
-    return true;
-
-  if (!CopyDirectory(from_path, to_path, true))
-    return false;
-
-  DeleteFile(from_path, true);
-  return true;
-}
-
-#if !defined(OS_MACOSX)
-// Mac has its own implementation, this is for all other Posix systems.
-bool CopyFileUnsafe(const FilePath& from_path, const FilePath& to_path) {
-  ThreadRestrictions::AssertIOAllowed();
-  int infile = HANDLE_EINTR(open(from_path.value().c_str(), O_RDONLY));
-  if (infile < 0)
-    return false;
-
-  int outfile = HANDLE_EINTR(creat(to_path.value().c_str(), 0666));
-  if (outfile < 0) {
-    close(infile);
-    return false;
-  }
-
-  const size_t kBufferSize = 32768;
-  std::vector<char> buffer(kBufferSize);
-  bool result = true;
-
-  while (result) {
-    ssize_t bytes_read = HANDLE_EINTR(read(infile, &buffer[0], buffer.size()));
-    if (bytes_read < 0) {
-      result = false;
-      break;
-    }
-    if (bytes_read == 0)
-      break;
-    // Allow for partial writes
-    ssize_t bytes_written_per_read = 0;
-    do {
-      ssize_t bytes_written_partial = HANDLE_EINTR(write(
-          outfile,
-          &buffer[bytes_written_per_read],
-          bytes_read - bytes_written_per_read));
-      if (bytes_written_partial < 0) {
-        result = false;
-        break;
-      }
-      bytes_written_per_read += bytes_written_partial;
-    } while (bytes_written_per_read < bytes_read);
-  }
-
-  if (IGNORE_EINTR(close(infile)) < 0)
-    result = false;
-  if (IGNORE_EINTR(close(outfile)) < 0)
-    result = false;
-
-  return result;
-}
-#endif  // !defined(OS_MACOSX)
-
-}  // namespace internal
-}  // namespace base