Add m-esr52 at 52.6.0

1 files changed, 1119 insertions, 0 deletions

diff --git a/dom/system/OSFileConstants.cpp b/dom/system/OSFileConstants.cpp
new file mode 100644
index 0000000000..945233f4c8
--- /dev/null
+++ b/dom/system/OSFileConstants.cpp
@@ -0,0 +1,1119 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/DebugOnly.h"
+
+#include "fcntl.h"
+#include "errno.h"
+
+#include "prsystem.h"
+
+#if defined(XP_UNIX)
+#include "unistd.h"
+#include "dirent.h"
+#include "poll.h"
+#include "sys/stat.h"
+#if defined(ANDROID)
+#include <sys/vfs.h>
+#define statvfs statfs
+#else
+#include "sys/statvfs.h"
+#include "sys/wait.h"
+#include <spawn.h>
+#endif // defined(ANDROID)
+#endif // defined(XP_UNIX)
+
+#if defined(XP_LINUX)
+#include <linux/fadvise.h>
+#endif // defined(XP_LINUX)
+
+#if defined(XP_MACOSX)
+#include "copyfile.h"
+#endif // defined(XP_MACOSX)
+
+#if defined(XP_WIN)
+#include <windows.h>
+#include <accctrl.h>
+
+#define PATH_MAX MAX_PATH
+
+#endif // defined(XP_WIN)
+
+#include "jsapi.h"
+#include "jsfriendapi.h"
+#include "BindingUtils.h"
+
+// Used to provide information on the OS
+
+#include "nsThreadUtils.h"
+#include "nsIObserverService.h"
+#include "nsIObserver.h"
+#include "nsDirectoryServiceUtils.h"
+#include "nsIXULRuntime.h"
+#include "nsIPropertyBag2.h"
+#include "nsXPCOMCIDInternal.h"
+#include "nsServiceManagerUtils.h"
+#include "nsString.h"
+#include "nsAutoPtr.h"
+#include "nsDirectoryServiceDefs.h"
+#include "nsXULAppAPI.h"
+#include "nsAppDirectoryServiceDefs.h"
+#include "mozJSComponentLoader.h"
+
+#include "OSFileConstants.h"
+#include "nsIOSFileConstantsService.h"
+#include "nsZipArchive.h"
+
+#if defined(__DragonFly__) || defined(__FreeBSD__) \
+  || defined(__NetBSD__) || defined(__OpenBSD__)
+#define __dd_fd dd_fd
+#endif
+
+/**
+ * This module defines the basic libc constants (error numbers, open modes,
+ * etc.) used by OS.File and possibly other OS-bound JavaScript libraries.
+ */
+
+
+namespace mozilla {
+
+// Use an anonymous namespace to hide the symbols and avoid any collision
+// with, for instance, |extern bool gInitialized;|
+namespace {
+/**
+ * |true| if this module has been initialized, |false| otherwise
+ */
+bool gInitialized = false;
+
+struct Paths {
+  /**
+   * The name of the directory holding all the libraries (libxpcom, libnss, etc.)
+   */
+  nsString libDir;
+  nsString tmpDir;
+  nsString profileDir;
+  nsString localProfileDir;
+  /**
+   * The user's home directory
+   */
+  nsString homeDir;
+  /**
+   * The user's desktop directory, if there is one. Otherwise this is
+   * the same as homeDir.
+   */
+  nsString desktopDir;
+  /**
+   * The user's 'application data' directory.
+   * Windows:
+   *   HOME = Documents and Settings\$USER\Application Data
+   *   UAppData = $HOME[\$vendor]\$name
+   *
+   * Unix:
+   *   HOME = ~
+   *   UAppData = $HOME/.[$vendor/]$name
+   *
+   * Mac:
+   *   HOME = ~
+   *   UAppData = $HOME/Library/Application Support/$name
+   */
+  nsString userApplicationDataDir;
+
+#if defined(XP_WIN)
+  /**
+   * The user's application data directory.
+   */
+  nsString winAppDataDir;
+  /**
+   * The programs subdirectory in the user's start menu directory.
+   */
+  nsString winStartMenuProgsDir;
+#endif // defined(XP_WIN)
+
+#if defined(XP_MACOSX)
+  /**
+   * The user's Library directory.
+   */
+  nsString macUserLibDir;
+  /**
+   * The Application directory, that stores applications installed in the
+   * system.
+   */
+  nsString macLocalApplicationsDir;
+  /**
+   * The user's trash directory.
+   */
+  nsString macTrashDir;
+#endif // defined(XP_MACOSX)
+
+  Paths()
+  {
+    libDir.SetIsVoid(true);
+    tmpDir.SetIsVoid(true);
+    profileDir.SetIsVoid(true);
+    localProfileDir.SetIsVoid(true);
+    homeDir.SetIsVoid(true);
+    desktopDir.SetIsVoid(true);
+    userApplicationDataDir.SetIsVoid(true);
+
+#if defined(XP_WIN)
+    winAppDataDir.SetIsVoid(true);
+    winStartMenuProgsDir.SetIsVoid(true);
+#endif // defined(XP_WIN)
+
+#if defined(XP_MACOSX)
+    macUserLibDir.SetIsVoid(true);
+    macLocalApplicationsDir.SetIsVoid(true);
+    macTrashDir.SetIsVoid(true);
+#endif // defined(XP_MACOSX)
+  }
+};
+
+/**
+ * System directories.
+ */
+Paths* gPaths = nullptr;
+
+/**
+ * (Unix) the umask, which goes in OS.Constants.Sys but
+ * can only be looked up (via the system-info service)
+ * on the main thread.
+ */
+uint32_t gUserUmask = 0;
+} // namespace
+
+/**
+ * Return the path to one of the special directories.
+ *
+ * @param aKey The key to the special directory (e.g. "TmpD", "ProfD", ...)
+ * @param aOutPath The path to the special directory. In case of error,
+ * the string is set to void.
+ */
+nsresult GetPathToSpecialDir(const char *aKey, nsString& aOutPath)
+{
+  nsCOMPtr<nsIFile> file;
+  nsresult rv = NS_GetSpecialDirectory(aKey, getter_AddRefs(file));
+  if (NS_FAILED(rv) || !file) {
+    return rv;
+  }
+
+  return file->GetPath(aOutPath);
+}
+
+/**
+ * In some cases, OSFileConstants may be instantiated before the
+ * profile is setup. In such cases, |OS.Constants.Path.profileDir| and
+ * |OS.Constants.Path.localProfileDir| are undefined. However, we want
+ * to ensure that this does not break existing code, so that future
+ * workers spawned after the profile is setup have these constants.
+ *
+ * For this purpose, we register an observer to set |gPaths->profileDir|
+ * and |gPaths->localProfileDir| once the profile is setup.
+ */
+class DelayedPathSetter final: public nsIObserver
+{
+  ~DelayedPathSetter() {}
+
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIOBSERVER
+
+  DelayedPathSetter() {}
+};
+
+NS_IMPL_ISUPPORTS(DelayedPathSetter, nsIObserver)
+
+NS_IMETHODIMP
+DelayedPathSetter::Observe(nsISupports*, const char * aTopic, const char16_t*)
+{
+  if (gPaths == nullptr) {
+    // Initialization of gPaths has not taken place, something is wrong,
+    // don't make things worse.
+    return NS_OK;
+  }
+  nsresult rv = GetPathToSpecialDir(NS_APP_USER_PROFILE_50_DIR, gPaths->profileDir);
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+  rv = GetPathToSpecialDir(NS_APP_USER_PROFILE_LOCAL_50_DIR, gPaths->localProfileDir);
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  return NS_OK;
+}
+
+/**
+ * Perform the part of initialization that can only be
+ * executed on the main thread.
+ */
+nsresult InitOSFileConstants()
+{
+  MOZ_ASSERT(NS_IsMainThread());
+  if (gInitialized) {
+    return NS_OK;
+  }
+
+  gInitialized = true;
+
+  nsAutoPtr<Paths> paths(new Paths);
+
+  // Initialize paths->libDir
+  nsCOMPtr<nsIFile> file;
+  nsresult rv = NS_GetSpecialDirectory(NS_XPCOM_LIBRARY_FILE, getter_AddRefs(file));
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  nsCOMPtr<nsIFile> libDir;
+  rv = file->GetParent(getter_AddRefs(libDir));
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  rv = libDir->GetPath(paths->libDir);
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  // Setup profileDir and localProfileDir immediately if possible (we
+  // assume that NS_APP_USER_PROFILE_50_DIR and
+  // NS_APP_USER_PROFILE_LOCAL_50_DIR are set simultaneously)
+  rv = GetPathToSpecialDir(NS_APP_USER_PROFILE_50_DIR, paths->profileDir);
+  if (NS_SUCCEEDED(rv)) {
+    rv = GetPathToSpecialDir(NS_APP_USER_PROFILE_LOCAL_50_DIR, paths->localProfileDir);
+  }
+
+  // Otherwise, delay setup of profileDir/localProfileDir until they
+  // become available.
+  if (NS_FAILED(rv)) {
+    nsCOMPtr<nsIObserverService> obsService = do_GetService(NS_OBSERVERSERVICE_CONTRACTID, &rv);
+    if (NS_FAILED(rv)) {
+      return rv;
+    }
+    RefPtr<DelayedPathSetter> pathSetter = new DelayedPathSetter();
+    rv = obsService->AddObserver(pathSetter, "profile-do-change", false);
+    if (NS_FAILED(rv)) {
+      return rv;
+    }
+  }
+
+  // For other directories, ignore errors (they may be undefined on
+  // some platforms or in non-Firefox embeddings of Gecko).
+
+  GetPathToSpecialDir(NS_OS_TEMP_DIR, paths->tmpDir);
+  GetPathToSpecialDir(NS_OS_HOME_DIR, paths->homeDir);
+  GetPathToSpecialDir(NS_OS_DESKTOP_DIR, paths->desktopDir);
+  GetPathToSpecialDir(XRE_USER_APP_DATA_DIR, paths->userApplicationDataDir);
+
+#if defined(XP_WIN)
+  GetPathToSpecialDir(NS_WIN_APPDATA_DIR, paths->winAppDataDir);
+  GetPathToSpecialDir(NS_WIN_PROGRAMS_DIR, paths->winStartMenuProgsDir);
+#endif // defined(XP_WIN)
+
+#if defined(XP_MACOSX)
+  GetPathToSpecialDir(NS_MAC_USER_LIB_DIR, paths->macUserLibDir);
+  GetPathToSpecialDir(NS_OSX_LOCAL_APPLICATIONS_DIR, paths->macLocalApplicationsDir);
+  GetPathToSpecialDir(NS_MAC_TRASH_DIR, paths->macTrashDir);
+#endif // defined(XP_MACOSX)
+
+  gPaths = paths.forget();
+
+  // Get the umask from the system-info service.
+  // The property will always be present, but it will be zero on
+  // non-Unix systems.
+  nsCOMPtr<nsIPropertyBag2> infoService =
+    do_GetService("@mozilla.org/system-info;1");
+  MOZ_ASSERT(infoService, "Could not access the system information service");
+  rv = infoService->GetPropertyAsUint32(NS_LITERAL_STRING("umask"),
+                                        &gUserUmask);
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  return NS_OK;
+}
+
+/**
+ * Perform the cleaning up that can only be executed on the main thread.
+ */
+void CleanupOSFileConstants()
+{
+  MOZ_ASSERT(NS_IsMainThread());
+  if (!gInitialized) {
+    return;
+  }
+
+  gInitialized = false;
+  delete gPaths;
+  gPaths = nullptr;
+}
+
+
+/**
+ * Define a simple read-only property holding an integer.
+ *
+ * @param name The name of the constant. Used both as the JS name for the
+ * constant and to access its value. Must be defined.
+ *
+ * Produces a |ConstantSpec|.
+ */
+#define INT_CONSTANT(name)      \
+  { #name, JS::Int32Value(name) }
+
+/**
+ * Define a simple read-only property holding an unsigned integer.
+ *
+ * @param name The name of the constant. Used both as the JS name for the
+ * constant and to access its value. Must be defined.
+ *
+ * Produces a |ConstantSpec|.
+ */
+#define UINT_CONSTANT(name)      \
+  { #name, JS::NumberValue(name) }
+
+/**
+ * End marker for ConstantSpec
+ */
+#define PROP_END { nullptr, JS::UndefinedValue() }
+
+
+// Define missing constants for Android
+#if !defined(S_IRGRP)
+#define S_IXOTH 0001
+#define S_IWOTH 0002
+#define S_IROTH 0004
+#define S_IRWXO 0007
+#define S_IXGRP 0010
+#define S_IWGRP 0020
+#define S_IRGRP 0040
+#define S_IRWXG 0070
+#define S_IXUSR 0100
+#define S_IWUSR 0200
+#define S_IRUSR 0400
+#define S_IRWXU 0700
+#endif // !defined(S_IRGRP)
+
+/**
+ * The properties defined in libc.
+ *
+ * If you extend this list of properties, please
+ * separate categories ("errors", "open", etc.),
+ * keep properties organized by alphabetical order
+ * and #ifdef-away properties that are not portable.
+ */
+static const dom::ConstantSpec gLibcProperties[] =
+{
+  // Arguments for open
+  INT_CONSTANT(O_APPEND),
+#if defined(O_CLOEXEC)
+  INT_CONSTANT(O_CLOEXEC),
+#endif // defined(O_CLOEXEC)
+  INT_CONSTANT(O_CREAT),
+#if defined(O_DIRECTORY)
+  INT_CONSTANT(O_DIRECTORY),
+#endif // defined(O_DIRECTORY)
+#if defined(O_EVTONLY)
+  INT_CONSTANT(O_EVTONLY),
+#endif // defined(O_EVTONLY)
+  INT_CONSTANT(O_EXCL),
+#if defined(O_EXLOCK)
+  INT_CONSTANT(O_EXLOCK),
+#endif // defined(O_EXLOCK)
+#if defined(O_LARGEFILE)
+  INT_CONSTANT(O_LARGEFILE),
+#endif // defined(O_LARGEFILE)
+#if defined(O_NOFOLLOW)
+  INT_CONSTANT(O_NOFOLLOW),
+#endif // defined(O_NOFOLLOW)
+#if defined(O_NONBLOCK)
+  INT_CONSTANT(O_NONBLOCK),
+#endif // defined(O_NONBLOCK)
+  INT_CONSTANT(O_RDONLY),
+  INT_CONSTANT(O_RDWR),
+#if defined(O_RSYNC)
+  INT_CONSTANT(O_RSYNC),
+#endif // defined(O_RSYNC)
+#if defined(O_SHLOCK)
+  INT_CONSTANT(O_SHLOCK),
+#endif // defined(O_SHLOCK)
+#if defined(O_SYMLINK)
+  INT_CONSTANT(O_SYMLINK),
+#endif // defined(O_SYMLINK)
+#if defined(O_SYNC)
+  INT_CONSTANT(O_SYNC),
+#endif // defined(O_SYNC)
+  INT_CONSTANT(O_TRUNC),
+  INT_CONSTANT(O_WRONLY),
+
+#if defined(FD_CLOEXEC)
+  INT_CONSTANT(FD_CLOEXEC),
+#endif // defined(FD_CLOEXEC)
+
+#if defined(AT_EACCESS)
+  INT_CONSTANT(AT_EACCESS),
+#endif //defined(AT_EACCESS)
+#if defined(AT_FDCWD)
+  INT_CONSTANT(AT_FDCWD),
+#endif //defined(AT_FDCWD)
+#if defined(AT_SYMLINK_NOFOLLOW)
+  INT_CONSTANT(AT_SYMLINK_NOFOLLOW),
+#endif //defined(AT_SYMLINK_NOFOLLOW)
+
+#if defined(POSIX_FADV_SEQUENTIAL)
+  INT_CONSTANT(POSIX_FADV_SEQUENTIAL),
+#endif //defined(POSIX_FADV_SEQUENTIAL)
+
+  // access
+#if defined(F_OK)
+  INT_CONSTANT(F_OK),
+  INT_CONSTANT(R_OK),
+  INT_CONSTANT(W_OK),
+  INT_CONSTANT(X_OK),
+#endif // defined(F_OK)
+
+  // modes
+  INT_CONSTANT(S_IRGRP),
+  INT_CONSTANT(S_IROTH),
+  INT_CONSTANT(S_IRUSR),
+  INT_CONSTANT(S_IRWXG),
+  INT_CONSTANT(S_IRWXO),
+  INT_CONSTANT(S_IRWXU),
+  INT_CONSTANT(S_IWGRP),
+  INT_CONSTANT(S_IWOTH),
+  INT_CONSTANT(S_IWUSR),
+  INT_CONSTANT(S_IXOTH),
+  INT_CONSTANT(S_IXGRP),
+  INT_CONSTANT(S_IXUSR),
+
+  // seek
+  INT_CONSTANT(SEEK_CUR),
+  INT_CONSTANT(SEEK_END),
+  INT_CONSTANT(SEEK_SET),
+
+#if defined(XP_UNIX)
+  // poll
+  INT_CONSTANT(POLLERR),
+  INT_CONSTANT(POLLHUP),
+  INT_CONSTANT(POLLIN),
+  INT_CONSTANT(POLLNVAL),
+  INT_CONSTANT(POLLOUT),
+
+  // wait
+#if defined(WNOHANG)
+  INT_CONSTANT(WNOHANG),
+#endif // defined(WNOHANG)
+
+  // fcntl command values
+  INT_CONSTANT(F_GETLK),
+  INT_CONSTANT(F_SETFD),
+  INT_CONSTANT(F_SETFL),
+  INT_CONSTANT(F_SETLK),
+  INT_CONSTANT(F_SETLKW),
+
+  // flock type values
+  INT_CONSTANT(F_RDLCK),
+  INT_CONSTANT(F_WRLCK),
+  INT_CONSTANT(F_UNLCK),
+
+  // splice
+#if defined(SPLICE_F_MOVE)
+  INT_CONSTANT(SPLICE_F_MOVE),
+#endif // defined(SPLICE_F_MOVE)
+#if defined(SPLICE_F_NONBLOCK)
+  INT_CONSTANT(SPLICE_F_NONBLOCK),
+#endif // defined(SPLICE_F_NONBLOCK)
+#if defined(SPLICE_F_MORE)
+  INT_CONSTANT(SPLICE_F_MORE),
+#endif // defined(SPLICE_F_MORE)
+#if defined(SPLICE_F_GIFT)
+  INT_CONSTANT(SPLICE_F_GIFT),
+#endif // defined(SPLICE_F_GIFT)
+#endif // defined(XP_UNIX)
+  // copyfile
+#if defined(COPYFILE_DATA)
+  INT_CONSTANT(COPYFILE_DATA),
+  INT_CONSTANT(COPYFILE_EXCL),
+  INT_CONSTANT(COPYFILE_XATTR),
+  INT_CONSTANT(COPYFILE_STAT),
+  INT_CONSTANT(COPYFILE_ACL),
+  INT_CONSTANT(COPYFILE_MOVE),
+#endif // defined(COPYFILE_DATA)
+
+  // error values
+  INT_CONSTANT(EACCES),
+  INT_CONSTANT(EAGAIN),
+  INT_CONSTANT(EBADF),
+  INT_CONSTANT(EEXIST),
+  INT_CONSTANT(EFAULT),
+  INT_CONSTANT(EFBIG),
+  INT_CONSTANT(EINVAL),
+  INT_CONSTANT(EIO),
+  INT_CONSTANT(EISDIR),
+#if defined(ELOOP) // not defined with VC9
+  INT_CONSTANT(ELOOP),
+#endif // defined(ELOOP)
+  INT_CONSTANT(EMFILE),
+  INT_CONSTANT(ENAMETOOLONG),
+  INT_CONSTANT(ENFILE),
+  INT_CONSTANT(ENOENT),
+  INT_CONSTANT(ENOMEM),
+  INT_CONSTANT(ENOSPC),
+  INT_CONSTANT(ENOTDIR),
+  INT_CONSTANT(ENXIO),
+#if defined(EOPNOTSUPP) // not defined with VC 9
+  INT_CONSTANT(EOPNOTSUPP),
+#endif // defined(EOPNOTSUPP)
+#if defined(EOVERFLOW) // not defined with VC 9
+  INT_CONSTANT(EOVERFLOW),
+#endif // defined(EOVERFLOW)
+  INT_CONSTANT(EPERM),
+  INT_CONSTANT(ERANGE),
+#if defined(ETIMEDOUT) // not defined with VC 9
+  INT_CONSTANT(ETIMEDOUT),
+#endif // defined(ETIMEDOUT)
+#if defined(EWOULDBLOCK) // not defined with VC 9
+  INT_CONSTANT(EWOULDBLOCK),
+#endif // defined(EWOULDBLOCK)
+  INT_CONSTANT(EXDEV),
+
+#if defined(DT_UNKNOWN)
+  // Constants for |readdir|
+  INT_CONSTANT(DT_UNKNOWN),
+  INT_CONSTANT(DT_FIFO),
+  INT_CONSTANT(DT_CHR),
+  INT_CONSTANT(DT_DIR),
+  INT_CONSTANT(DT_BLK),
+  INT_CONSTANT(DT_REG),
+  INT_CONSTANT(DT_LNK),
+  INT_CONSTANT(DT_SOCK),
+#endif // defined(DT_UNKNOWN)
+
+#if defined(S_IFIFO)
+  // Constants for |stat|
+  INT_CONSTANT(S_IFMT),
+  INT_CONSTANT(S_IFIFO),
+  INT_CONSTANT(S_IFCHR),
+  INT_CONSTANT(S_IFDIR),
+  INT_CONSTANT(S_IFBLK),
+  INT_CONSTANT(S_IFREG),
+  INT_CONSTANT(S_IFLNK),
+  INT_CONSTANT(S_IFSOCK),
+#endif // defined(S_IFIFO)
+
+  INT_CONSTANT(PATH_MAX),
+
+  // Constants used to define data structures
+  //
+  // Many data structures have different fields/sizes/etc. on
+  // various OSes / versions of the same OS / platforms. For these
+  // data structures, we need to compute and export from C the size
+  // and, if necessary, the offset of fields, so as to be able to
+  // define the structure in JS.
+
+#if defined(XP_UNIX)
+  // The size of |mode_t|.
+  { "OSFILE_SIZEOF_MODE_T", JS::Int32Value(sizeof (mode_t)) },
+
+  // The size of |gid_t|.
+  { "OSFILE_SIZEOF_GID_T", JS::Int32Value(sizeof (gid_t)) },
+
+  // The size of |uid_t|.
+  { "OSFILE_SIZEOF_UID_T", JS::Int32Value(sizeof (uid_t)) },
+
+  // The size of |time_t|.
+  { "OSFILE_SIZEOF_TIME_T", JS::Int32Value(sizeof (time_t)) },
+
+  // The size of |fsblkcnt_t|.
+  { "OSFILE_SIZEOF_FSBLKCNT_T", JS::Int32Value(sizeof (fsblkcnt_t)) },
+
+#if !defined(ANDROID)
+  // The size of |posix_spawn_file_actions_t|.
+  { "OSFILE_SIZEOF_POSIX_SPAWN_FILE_ACTIONS_T", JS::Int32Value(sizeof (posix_spawn_file_actions_t)) },
+#endif // !defined(ANDROID)
+
+  // Defining |dirent|.
+  // Size
+  { "OSFILE_SIZEOF_DIRENT", JS::Int32Value(sizeof (dirent)) },
+
+  // Defining |flock|.
+#if defined(XP_UNIX)
+  { "OSFILE_SIZEOF_FLOCK", JS::Int32Value(sizeof (struct flock)) },
+  { "OSFILE_OFFSETOF_FLOCK_L_START", JS::Int32Value(offsetof (struct flock, l_start)) },
+  { "OSFILE_OFFSETOF_FLOCK_L_LEN", JS::Int32Value(offsetof (struct flock, l_len)) },
+  { "OSFILE_OFFSETOF_FLOCK_L_PID", JS::Int32Value(offsetof (struct flock, l_pid)) },
+  { "OSFILE_OFFSETOF_FLOCK_L_TYPE", JS::Int32Value(offsetof (struct flock, l_type)) },
+  { "OSFILE_OFFSETOF_FLOCK_L_WHENCE", JS::Int32Value(offsetof (struct flock, l_whence)) },
+#endif // defined(XP_UNIX)
+  // Offset of field |d_name|.
+  { "OSFILE_OFFSETOF_DIRENT_D_NAME", JS::Int32Value(offsetof (struct dirent, d_name)) },
+  // An upper bound to the length of field |d_name| of struct |dirent|.
+  // (may not be exact, depending on padding).
+  { "OSFILE_SIZEOF_DIRENT_D_NAME", JS::Int32Value(sizeof (struct dirent) - offsetof (struct dirent, d_name)) },
+
+  // Defining |timeval|.
+  { "OSFILE_SIZEOF_TIMEVAL", JS::Int32Value(sizeof (struct timeval)) },
+  { "OSFILE_OFFSETOF_TIMEVAL_TV_SEC", JS::Int32Value(offsetof (struct timeval, tv_sec)) },
+  { "OSFILE_OFFSETOF_TIMEVAL_TV_USEC", JS::Int32Value(offsetof (struct timeval, tv_usec)) },
+
+#if defined(DT_UNKNOWN)
+  // Position of field |d_type| in |dirent|
+  // Not strictly posix, but seems defined on all platforms
+  // except mingw32.
+  { "OSFILE_OFFSETOF_DIRENT_D_TYPE", JS::Int32Value(offsetof (struct dirent, d_type)) },
+#endif // defined(DT_UNKNOWN)
+
+  // Under MacOS X and BSDs, |dirfd| is a macro rather than a
+  // function, so we need a little help to get it to work
+#if defined(dirfd)
+  { "OSFILE_SIZEOF_DIR", JS::Int32Value(sizeof (DIR)) },
+
+  { "OSFILE_OFFSETOF_DIR_DD_FD", JS::Int32Value(offsetof (DIR, __dd_fd)) },
+#endif
+
+  // Defining |stat|
+
+  { "OSFILE_SIZEOF_STAT", JS::Int32Value(sizeof (struct stat)) },
+
+  { "OSFILE_OFFSETOF_STAT_ST_MODE", JS::Int32Value(offsetof (struct stat, st_mode)) },
+  { "OSFILE_OFFSETOF_STAT_ST_UID", JS::Int32Value(offsetof (struct stat, st_uid)) },
+  { "OSFILE_OFFSETOF_STAT_ST_GID", JS::Int32Value(offsetof (struct stat, st_gid)) },
+  { "OSFILE_OFFSETOF_STAT_ST_SIZE", JS::Int32Value(offsetof (struct stat, st_size)) },
+
+#if defined(HAVE_ST_ATIMESPEC)
+  { "OSFILE_OFFSETOF_STAT_ST_ATIME", JS::Int32Value(offsetof (struct stat, st_atimespec)) },
+  { "OSFILE_OFFSETOF_STAT_ST_MTIME", JS::Int32Value(offsetof (struct stat, st_mtimespec)) },
+  { "OSFILE_OFFSETOF_STAT_ST_CTIME", JS::Int32Value(offsetof (struct stat, st_ctimespec)) },
+#else
+  { "OSFILE_OFFSETOF_STAT_ST_ATIME", JS::Int32Value(offsetof (struct stat, st_atime)) },
+  { "OSFILE_OFFSETOF_STAT_ST_MTIME", JS::Int32Value(offsetof (struct stat, st_mtime)) },
+  { "OSFILE_OFFSETOF_STAT_ST_CTIME", JS::Int32Value(offsetof (struct stat, st_ctime)) },
+#endif // defined(HAVE_ST_ATIME)
+
+  // Several OSes have a birthtime field. For the moment, supporting only Darwin.
+#if defined(_DARWIN_FEATURE_64_BIT_INODE)
+  { "OSFILE_OFFSETOF_STAT_ST_BIRTHTIME", JS::Int32Value(offsetof (struct stat, st_birthtime)) },
+#endif // defined(_DARWIN_FEATURE_64_BIT_INODE)
+
+  // Defining |statvfs|
+
+  { "OSFILE_SIZEOF_STATVFS", JS::Int32Value(sizeof (struct statvfs)) },
+
+  { "OSFILE_OFFSETOF_STATVFS_F_BSIZE", JS::Int32Value(offsetof (struct statvfs, f_bsize)) },
+  { "OSFILE_OFFSETOF_STATVFS_F_BAVAIL", JS::Int32Value(offsetof (struct statvfs, f_bavail)) },
+
+#endif // defined(XP_UNIX)
+
+
+
+  // System configuration
+
+  // Under MacOSX, to avoid using deprecated functions that do not
+  // match the constants we define in this object (including
+  // |sizeof|/|offsetof| stuff, but not only), for a number of
+  // functions, we need to adapt the name of the symbols we are using,
+  // whenever macro _DARWIN_FEATURE_64_BIT_INODE is set. We export
+  // this value to be able to do so from JavaScript.
+#if defined(_DARWIN_FEATURE_64_BIT_INODE)
+   { "_DARWIN_FEATURE_64_BIT_INODE", JS::Int32Value(1) },
+#endif // defined(_DARWIN_FEATURE_64_BIT_INODE)
+
+  // Similar feature for Linux
+#if defined(_STAT_VER)
+  INT_CONSTANT(_STAT_VER),
+#endif // defined(_STAT_VER)
+
+  PROP_END
+};
+
+
+#if defined(XP_WIN)
+/**
+ * The properties defined in windows.h.
+ *
+ * If you extend this list of properties, please
+ * separate categories ("errors", "open", etc.),
+ * keep properties organized by alphabetical order
+ * and #ifdef-away properties that are not portable.
+ */
+static const dom::ConstantSpec gWinProperties[] =
+{
+  // FormatMessage flags
+  INT_CONSTANT(FORMAT_MESSAGE_FROM_SYSTEM),
+  INT_CONSTANT(FORMAT_MESSAGE_IGNORE_INSERTS),
+
+  // The max length of paths
+  INT_CONSTANT(MAX_PATH),
+
+  // CreateFile desired access
+  INT_CONSTANT(GENERIC_ALL),
+  INT_CONSTANT(GENERIC_EXECUTE),
+  INT_CONSTANT(GENERIC_READ),
+  INT_CONSTANT(GENERIC_WRITE),
+
+  // CreateFile share mode
+  INT_CONSTANT(FILE_SHARE_DELETE),
+  INT_CONSTANT(FILE_SHARE_READ),
+  INT_CONSTANT(FILE_SHARE_WRITE),
+
+  // CreateFile creation disposition
+  INT_CONSTANT(CREATE_ALWAYS),
+  INT_CONSTANT(CREATE_NEW),
+  INT_CONSTANT(OPEN_ALWAYS),
+  INT_CONSTANT(OPEN_EXISTING),
+  INT_CONSTANT(TRUNCATE_EXISTING),
+
+  // CreateFile attributes
+  INT_CONSTANT(FILE_ATTRIBUTE_ARCHIVE),
+  INT_CONSTANT(FILE_ATTRIBUTE_DIRECTORY),
+  INT_CONSTANT(FILE_ATTRIBUTE_HIDDEN),
+  INT_CONSTANT(FILE_ATTRIBUTE_NORMAL),
+  INT_CONSTANT(FILE_ATTRIBUTE_READONLY),
+  INT_CONSTANT(FILE_ATTRIBUTE_REPARSE_POINT),
+  INT_CONSTANT(FILE_ATTRIBUTE_SYSTEM),
+  INT_CONSTANT(FILE_ATTRIBUTE_TEMPORARY),
+  INT_CONSTANT(FILE_FLAG_BACKUP_SEMANTICS),
+
+  // CreateFile error constant
+  { "INVALID_HANDLE_VALUE", JS::Int32Value(INT_PTR(INVALID_HANDLE_VALUE)) },
+
+
+  // CreateFile flags
+  INT_CONSTANT(FILE_FLAG_DELETE_ON_CLOSE),
+
+  // SetFilePointer methods
+  INT_CONSTANT(FILE_BEGIN),
+  INT_CONSTANT(FILE_CURRENT),
+  INT_CONSTANT(FILE_END),
+
+  // SetFilePointer error constant
+  UINT_CONSTANT(INVALID_SET_FILE_POINTER),
+
+  // File attributes
+  INT_CONSTANT(FILE_ATTRIBUTE_DIRECTORY),
+
+
+  // MoveFile flags
+  INT_CONSTANT(MOVEFILE_COPY_ALLOWED),
+  INT_CONSTANT(MOVEFILE_REPLACE_EXISTING),
+
+  // GetFileAttributes error constant
+  INT_CONSTANT(INVALID_FILE_ATTRIBUTES),
+
+  // GetNamedSecurityInfo and SetNamedSecurityInfo constants
+  INT_CONSTANT(UNPROTECTED_DACL_SECURITY_INFORMATION),
+  INT_CONSTANT(SE_FILE_OBJECT),
+  INT_CONSTANT(DACL_SECURITY_INFORMATION),
+
+  // Errors
+  INT_CONSTANT(ERROR_INVALID_HANDLE),
+  INT_CONSTANT(ERROR_ACCESS_DENIED),
+  INT_CONSTANT(ERROR_DIR_NOT_EMPTY),
+  INT_CONSTANT(ERROR_FILE_EXISTS),
+  INT_CONSTANT(ERROR_ALREADY_EXISTS),
+  INT_CONSTANT(ERROR_FILE_NOT_FOUND),
+  INT_CONSTANT(ERROR_NO_MORE_FILES),
+  INT_CONSTANT(ERROR_PATH_NOT_FOUND),
+  INT_CONSTANT(ERROR_BAD_ARGUMENTS),
+  INT_CONSTANT(ERROR_SHARING_VIOLATION),
+  INT_CONSTANT(ERROR_NOT_SUPPORTED),
+
+  PROP_END
+};
+#endif // defined(XP_WIN)
+
+
+/**
+ * Get a field of an object as an object.
+ *
+ * If the field does not exist, create it. If it exists but is not an
+ * object, throw a JS error.
+ */
+JSObject *GetOrCreateObjectProperty(JSContext *cx, JS::Handle<JSObject*> aObject,
+                                    const char *aProperty)
+{
+  JS::Rooted<JS::Value> val(cx);
+  if (!JS_GetProperty(cx, aObject, aProperty, &val)) {
+    return nullptr;
+  }
+  if (!val.isUndefined()) {
+    if (val.isObject()) {
+      return &val.toObject();
+    }
+
+    JS_ReportErrorNumberASCII(cx, js::GetErrorMessage, nullptr,
+                              JSMSG_UNEXPECTED_TYPE,
+                              aProperty, "not an object");
+    return nullptr;
+  }
+  return JS_DefineObject(cx, aObject, aProperty, nullptr, JSPROP_ENUMERATE);
+}
+
+/**
+ * Set a property of an object from a nsString.
+ *
+ * If the nsString is void (i.e. IsVoid is true), do nothing.
+ */
+bool SetStringProperty(JSContext *cx, JS::Handle<JSObject*> aObject, const char *aProperty,
+                       const nsString aValue)
+{
+  if (aValue.IsVoid()) {
+    return true;
+  }
+  JSString* strValue = JS_NewUCStringCopyZ(cx, aValue.get());
+  NS_ENSURE_TRUE(strValue, false);
+  JS::Rooted<JS::Value> valValue(cx, JS::StringValue(strValue));
+  return JS_SetProperty(cx, aObject, aProperty, valValue);
+}
+
+/**
+ * Define OS-specific constants.
+ *
+ * This function creates or uses JS object |OS.Constants| to store
+ * all its constants.
+ */
+bool DefineOSFileConstants(JSContext *cx, JS::Handle<JSObject*> global)
+{
+  if (!gInitialized || gPaths == nullptr) {
+    // If an initialization error was ignored, we may end up with
+    // |gInitialized == true| but |gPaths == nullptr|. We cannot
+    // |MOZ_ASSERT| this, as this would kill precompile_cache.js,
+    // so we simply return an error.
+    JS_ReportErrorNumberASCII(cx, js::GetErrorMessage, nullptr,
+                              JSMSG_CANT_OPEN,
+                              "OSFileConstants", "initialization has failed");
+    return false;
+  }
+
+  JS::Rooted<JSObject*> objOS(cx);
+  if (!(objOS = GetOrCreateObjectProperty(cx, global, "OS"))) {
+    return false;
+  }
+  JS::Rooted<JSObject*> objConstants(cx);
+  if (!(objConstants = GetOrCreateObjectProperty(cx, objOS, "Constants"))) {
+    return false;
+  }
+
+  // Build OS.Constants.libc
+
+  JS::Rooted<JSObject*> objLibc(cx);
+  if (!(objLibc = GetOrCreateObjectProperty(cx, objConstants, "libc"))) {
+    return false;
+  }
+  if (!dom::DefineConstants(cx, objLibc, gLibcProperties)) {
+    return false;
+  }
+
+#if defined(XP_WIN)
+  // Build OS.Constants.Win
+
+  JS::Rooted<JSObject*> objWin(cx);
+  if (!(objWin = GetOrCreateObjectProperty(cx, objConstants, "Win"))) {
+    return false;
+  }
+  if (!dom::DefineConstants(cx, objWin, gWinProperties)) {
+    return false;
+  }
+#endif // defined(XP_WIN)
+
+  // Build OS.Constants.Sys
+
+  JS::Rooted<JSObject*> objSys(cx);
+  if (!(objSys = GetOrCreateObjectProperty(cx, objConstants, "Sys"))) {
+    return false;
+  }
+
+#if defined(MOZ_WIDGET_GONK)
+    JSString* strVersion = JS_NewStringCopyZ(cx, "Gonk");
+    if (!strVersion){
+      return false;
+    }
+    JS::Rooted<JS::Value> valVersion(cx, JS::StringValue(strVersion));
+    if (!JS_SetProperty(cx, objSys, "Name", valVersion)) {
+      return false;
+  }
+#else
+  nsCOMPtr<nsIXULRuntime> runtime = do_GetService(XULRUNTIME_SERVICE_CONTRACTID);
+  if (runtime) {
+    nsAutoCString os;
+    DebugOnly<nsresult> rv = runtime->GetOS(os);
+    MOZ_ASSERT(NS_SUCCEEDED(rv));
+
+    JSString* strVersion = JS_NewStringCopyZ(cx, os.get());
+    if (!strVersion) {
+      return false;
+    }
+
+    JS::Rooted<JS::Value> valVersion(cx, JS::StringValue(strVersion));
+    if (!JS_SetProperty(cx, objSys, "Name", valVersion)) {
+      return false;
+    }
+  }
+#endif // defined(MOZ_WIDGET_GONK)
+
+#if defined(DEBUG)
+  JS::Rooted<JS::Value> valDebug(cx, JS::TrueValue());
+  if (!JS_SetProperty(cx, objSys, "DEBUG", valDebug)) {
+    return false;
+  }
+#endif
+
+#if defined(HAVE_64BIT_BUILD)
+  JS::Rooted<JS::Value> valBits(cx, JS::Int32Value(64));
+#else
+  JS::Rooted<JS::Value> valBits(cx, JS::Int32Value(32));
+#endif //defined (HAVE_64BIT_BUILD)
+  if (!JS_SetProperty(cx, objSys, "bits", valBits)) {
+    return false;
+  }
+
+  if (!JS_DefineProperty(cx, objSys, "umask", gUserUmask,
+                         JSPROP_ENUMERATE | JSPROP_READONLY | JSPROP_PERMANENT)) {
+      return false;
+  }
+
+  // Build OS.Constants.Path
+
+  JS::Rooted<JSObject*> objPath(cx);
+  if (!(objPath = GetOrCreateObjectProperty(cx, objConstants, "Path"))) {
+    return false;
+  }
+
+  // Locate libxul
+  // Note that we don't actually provide the full path, only the name of the
+  // library, which is sufficient to link to the library using js-ctypes.
+
+#if defined(XP_MACOSX)
+  // Under MacOS X, for some reason, libxul is called simply "XUL",
+  // and we need to provide the full path.
+  nsAutoString libxul;
+  libxul.Append(gPaths->libDir);
+  libxul.AppendLiteral("/XUL");
+#else
+  // On other platforms, libxul is a library "xul" with regular
+  // library prefix/suffix.
+  nsAutoString libxul;
+  libxul.AppendLiteral(DLL_PREFIX);
+  libxul.AppendLiteral("xul");
+  libxul.AppendLiteral(DLL_SUFFIX);
+#endif // defined(XP_MACOSX)
+
+  if (!SetStringProperty(cx, objPath, "libxul", libxul)) {
+    return false;
+  }
+
+  if (!SetStringProperty(cx, objPath, "libDir", gPaths->libDir)) {
+    return false;
+  }
+
+  if (!SetStringProperty(cx, objPath, "tmpDir", gPaths->tmpDir)) {
+    return false;
+  }
+
+  // Configure profileDir only if it is available at this stage
+  if (!gPaths->profileDir.IsVoid()
+    && !SetStringProperty(cx, objPath, "profileDir", gPaths->profileDir)) {
+    return false;
+  }
+
+  // Configure localProfileDir only if it is available at this stage
+  if (!gPaths->localProfileDir.IsVoid()
+    && !SetStringProperty(cx, objPath, "localProfileDir", gPaths->localProfileDir)) {
+    return false;
+  }
+
+  if (!SetStringProperty(cx, objPath, "homeDir", gPaths->homeDir)) {
+    return false;
+  }
+
+  if (!SetStringProperty(cx, objPath, "desktopDir", gPaths->desktopDir)) {
+    return false;
+  }
+
+  if (!SetStringProperty(cx, objPath, "userApplicationDataDir", gPaths->userApplicationDataDir)) {
+    return false;
+  }
+
+#if defined(XP_WIN)
+  if (!SetStringProperty(cx, objPath, "winAppDataDir", gPaths->winAppDataDir)) {
+    return false;
+  }
+
+  if (!SetStringProperty(cx, objPath, "winStartMenuProgsDir", gPaths->winStartMenuProgsDir)) {
+    return false;
+  }
+#endif // defined(XP_WIN)
+
+#if defined(XP_MACOSX)
+  if (!SetStringProperty(cx, objPath, "macUserLibDir", gPaths->macUserLibDir)) {
+    return false;
+  }
+
+  if (!SetStringProperty(cx, objPath, "macLocalApplicationsDir", gPaths->macLocalApplicationsDir)) {
+    return false;
+  }
+
+  if (!SetStringProperty(cx, objPath, "macTrashDir", gPaths->macTrashDir)) {
+    return false;
+  }
+#endif // defined(XP_MACOSX)
+
+  // sqlite3 is linked from different places depending on the platform
+  nsAutoString libsqlite3;
+#if defined(ANDROID)
+  // On Android, we use the system's libsqlite3
+  libsqlite3.AppendLiteral(DLL_PREFIX);
+  libsqlite3.AppendLiteral("sqlite3");
+  libsqlite3.AppendLiteral(DLL_SUFFIX);
+#elif defined(XP_WIN)
+  // On Windows, for some reason, this is part of nss3.dll
+  libsqlite3.AppendLiteral(DLL_PREFIX);
+  libsqlite3.AppendLiteral("nss3");
+  libsqlite3.AppendLiteral(DLL_SUFFIX);
+#else
+    // On other platforms, we link sqlite3 into libxul
+  libsqlite3 = libxul;
+#endif // defined(ANDROID) || defined(XP_WIN)
+
+  if (!SetStringProperty(cx, objPath, "libsqlite3", libsqlite3)) {
+    return false;
+  }
+
+  return true;
+}
+
+NS_IMPL_ISUPPORTS(OSFileConstantsService, nsIOSFileConstantsService)
+
+OSFileConstantsService::OSFileConstantsService()
+{
+  MOZ_ASSERT(NS_IsMainThread());
+}
+
+OSFileConstantsService::~OSFileConstantsService()
+{
+  mozilla::CleanupOSFileConstants();
+}
+
+
+NS_IMETHODIMP
+OSFileConstantsService::Init(JSContext *aCx)
+{
+  nsresult rv = mozilla::InitOSFileConstants();
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  mozJSComponentLoader* loader = mozJSComponentLoader::Get();
+  JS::Rooted<JSObject*> targetObj(aCx);
+  rv = loader->FindTargetObject(aCx, &targetObj);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  if (!mozilla::DefineOSFileConstants(aCx, targetObj)) {
+    return NS_ERROR_FAILURE;
+  }
+
+  return NS_OK;
+}
+
+} // namespace mozilla