/**
* g_cancellable_make_pollfd:
* @cancellable: (allow-none): a #GCancellable or %NULL
* @pollfd: a pointer to a #GPollFD
*
* Creates a #GPollFD corresponding to @cancellable; this can be passed
* to g_poll() and used to poll for cancellation. This is useful both
* for unix systems without a native poll and for portability to
* windows.
*
* When this function returns %TRUE, you should use
* g_cancellable_release_fd() to free up resources allocated for the
* @pollfd. After a %FALSE return, do not call g_cancellable_release_fd().
*
* If this function returns %FALSE, either no @cancellable was given or
* resource limits prevent this function from allocating the necessary
* structures for polling. (On Linux, you will likely have reached
* the maximum number of file descriptors.) The suggested way to handle
* these cases is to ignore the @cancellable.
*
* You are not supposed to read from the fd yourself, just check for
* readable status. Reading to unset the readable status is done
* with g_cancellable_reset().
*
* Returns: %TRUE if @pollfd was successfully initialized, %FALSE on
* failure to prepare the cancellable.
*
* Since: 2.22
**/
gboolean
g_cancellable_make_pollfd (GCancellable *cancellable, GPollFD *pollfd)
{
g_return_val_if_fail (pollfd != NULL, FALSE);
if (cancellable == NULL)
return FALSE;
g_return_val_if_fail (G_IS_CANCELLABLE (cancellable), FALSE);
g_mutex_lock (&cancellable_mutex);
cancellable->priv->fd_refcount++;
if (cancellable->priv->wakeup == NULL)
{
cancellable->priv->wakeup = GLIB_PRIVATE_CALL (g_wakeup_new) ();
if (cancellable->priv->cancelled)
GLIB_PRIVATE_CALL (g_wakeup_signal) (cancellable->priv->wakeup);
}
GLIB_PRIVATE_CALL (g_wakeup_get_pollfd) (cancellable->priv->wakeup, pollfd);
g_mutex_unlock (&cancellable_mutex);
return TRUE;
}
/**
* g_cancellable_reset:
* @cancellable: a #GCancellable object.
*
* Resets @cancellable to its uncancelled state.
*
* If cancellable is currently in use by any cancellable operation
* then the behavior of this function is undefined.
**/
void
g_cancellable_reset (GCancellable *cancellable)
{
GCancellablePrivate *priv;
g_return_if_fail (G_IS_CANCELLABLE (cancellable));
g_mutex_lock (&cancellable_mutex);
priv = cancellable->priv;
while (priv->cancelled_running)
{
priv->cancelled_running_waiting = TRUE;
g_cond_wait (&cancellable_cond, &cancellable_mutex);
}
if (priv->cancelled)
{
if (priv->wakeup)
GLIB_PRIVATE_CALL (g_wakeup_acknowledge) (priv->wakeup);
priv->cancelled = FALSE;
}
g_mutex_unlock (&cancellable_mutex);
}
static gboolean
g_fam_file_monitor_is_supported (void)
{
g_mutex_lock (&fam_lock);
if (!fam_initialised)
{
fam_initialised = FAMOpen2 (&fam_connection, "GLib GIO") == 0;
if (fam_initialised)
{
#ifdef HAVE_FAM_NO_EXISTS
/* This is a gamin extension that avoids sending all the
* Exists event for dir monitors
*/
FAMNoExists (&fam_connection);
#endif
fam_source = g_unix_fd_source_new (FAMCONNECTION_GETFD (&fam_connection), G_IO_IN);
g_source_set_callback (fam_source, (GSourceFunc) g_fam_file_monitor_callback, NULL, NULL);
g_source_attach (fam_source, GLIB_PRIVATE_CALL(g_get_worker_context) ());
}
}
g_mutex_unlock (&fam_lock);
g_print ("II %d\n", fam_initialised);
return fam_initialised;
}
static void
g_cancellable_finalize (GObject *object)
{
GCancellable *cancellable = G_CANCELLABLE (object);
if (cancellable->priv->wakeup)
GLIB_PRIVATE_CALL (g_wakeup_free) (cancellable->priv->wakeup);
G_OBJECT_CLASS (g_cancellable_parent_class)->finalize (object);
}
/**
* g_cancellable_cancel:
* @cancellable: a #GCancellable object.
*
* Will set @cancellable to cancelled, and will emit the
* #GCancellable::cancelled signal. (However, see the warning about
* race conditions in the documentation for that signal if you are
* planning to connect to it.)
*
* This function is thread-safe. In other words, you can safely call
* it from a thread other than the one running the operation that was
* passed the @cancellable.
*
* The convention within gio is that cancelling an asynchronous
* operation causes it to complete asynchronously. That is, if you
* cancel the operation from the same thread in which it is running,
* then the operation's #GAsyncReadyCallback will not be invoked until
* the application returns to the main loop.
**/
void
g_cancellable_cancel (GCancellable *cancellable)
{
GCancellablePrivate *priv;
if (cancellable == NULL ||
cancellable->priv->cancelled)
return;
priv = cancellable->priv;
g_mutex_lock (&cancellable_mutex);
if (priv->cancelled)
{
g_mutex_unlock (&cancellable_mutex);
return;
}
priv->cancelled = TRUE;
priv->cancelled_running = TRUE;
if (priv->wakeup)
GLIB_PRIVATE_CALL (g_wakeup_signal) (priv->wakeup);
g_mutex_unlock (&cancellable_mutex);
g_object_ref (cancellable);
g_signal_emit (cancellable, signals[CANCELLED], 0);
g_mutex_lock (&cancellable_mutex);
priv->cancelled_running = FALSE;
if (priv->cancelled_running_waiting)
g_cond_broadcast (&cancellable_cond);
priv->cancelled_running_waiting = FALSE;
g_mutex_unlock (&cancellable_mutex);
g_object_unref (cancellable);
}
/**
* g_cancellable_release_fd:
* @cancellable: a #GCancellable
*
* Releases a resources previously allocated by g_cancellable_get_fd()
* or g_cancellable_make_pollfd().
*
* For compatibility reasons with older releases, calling this function
* is not strictly required, the resources will be automatically freed
* when the @cancellable is finalized. However, the @cancellable will
* block scarce file descriptors until it is finalized if this function
* is not called. This can cause the application to run out of file
* descriptors when many #GCancellables are used at the same time.
*
* Since: 2.22
**/
void
g_cancellable_release_fd (GCancellable *cancellable)
{
GCancellablePrivate *priv;
if (cancellable == NULL)
return;
g_return_if_fail (G_IS_CANCELLABLE (cancellable));
g_return_if_fail (cancellable->priv->fd_refcount > 0);
priv = cancellable->priv;
g_mutex_lock (&cancellable_mutex);
priv->fd_refcount--;
if (priv->fd_refcount == 0)
{
GLIB_PRIVATE_CALL (g_wakeup_free) (priv->wakeup);
priv->wakeup = NULL;
}
g_mutex_unlock (&cancellable_mutex);
}
/* inotify_lock must be held before calling */
void
_im_add (inotify_sub *sub)
{
if (g_list_find (missing_sub_list, sub))
{
IM_W ("asked to add %s to missing list but it's already on the list!\n", sub->dirname);
return;
}
IM_W ("adding %s to missing list\n", sub->dirname);
missing_sub_list = g_list_prepend (missing_sub_list, sub);
/* If the timeout is turned off, we turn it back on */
if (!scan_missing_running)
{
GSource *source;
scan_missing_running = TRUE;
source = g_timeout_source_new_seconds (SCAN_MISSING_TIME);
g_source_set_callback (source, im_scan_missing, NULL, NULL);
g_source_attach (source, GLIB_PRIVATE_CALL (g_get_worker_context) ());
g_source_unref (source);
}
}
static gchar *
get_session_address_dbus_launch (GError **error)
{
gchar *ret;
gchar *machine_id;
gchar *command_line;
gchar *launch_stdout;
gchar *launch_stderr;
gint exit_status;
gchar *old_dbus_verbose;
gboolean restore_dbus_verbose;
ret = NULL;
machine_id = NULL;
command_line = NULL;
launch_stdout = NULL;
launch_stderr = NULL;
restore_dbus_verbose = FALSE;
old_dbus_verbose = NULL;
/* Don't run binaries as root if we're setuid. */
if (GLIB_PRIVATE_CALL (g_check_setuid) ())
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
_("Cannot spawn a message bus when setuid"));
goto out;
}
machine_id = _g_dbus_get_machine_id (error);
if (machine_id == NULL)
{
g_prefix_error (error, _("Cannot spawn a message bus without a machine-id: "));
goto out;
}
/* We're using private libdbus facilities here. When everything
* (X11, Mac OS X, Windows) is spec'ed out correctly (not even the
* X11 property is correctly documented right now) we should
* consider using the spec instead of dbus-launch.
*
* --autolaunch=MACHINEID
* This option implies that dbus-launch should scan for a previ‐
* ously-started session and reuse the values found there. If no
* session is found, it will start a new session. The --exit-with-
* session option is implied if --autolaunch is given. This option
* is for the exclusive use of libdbus, you do not want to use it
* manually. It may change in the future.
*/
/* TODO: maybe provide a variable for where to look for the dbus-launch binary? */
command_line = g_strdup_printf ("dbus-launch --autolaunch=%s --binary-syntax --close-stderr", machine_id);
if (G_UNLIKELY (_g_dbus_debug_address ()))
{
_g_dbus_debug_print_lock ();
g_print ("GDBus-debug:Address: Running '%s' to get bus address (possibly autolaunching)\n", command_line);
old_dbus_verbose = g_strdup (g_getenv ("DBUS_VERBOSE"));
restore_dbus_verbose = TRUE;
g_setenv ("DBUS_VERBOSE", "1", TRUE);
_g_dbus_debug_print_unlock ();
}
if (!g_spawn_command_line_sync (command_line,
&launch_stdout,
&launch_stderr,
&exit_status,
error))
{
goto out;
}
if (!g_spawn_check_exit_status (exit_status, error))
{
g_prefix_error (error, _("Error spawning command line '%s': "), command_line);
goto out;
}
/* From the dbus-launch(1) man page:
*
* --binary-syntax Write to stdout a nul-terminated bus address,
* then the bus PID as a binary integer of size sizeof(pid_t),
* then the bus X window ID as a binary integer of size
* sizeof(long). Integers are in the machine's byte order, not
* network byte order or any other canonical byte order.
*/
ret = g_strdup (launch_stdout);
out:
if (G_UNLIKELY (_g_dbus_debug_address ()))
{
gchar *s;
_g_dbus_debug_print_lock ();
g_print ("GDBus-debug:Address: dbus-launch output:");
if (launch_stdout != NULL)
{
s = _g_dbus_hexdump (launch_stdout, strlen (launch_stdout) + 1 + sizeof (pid_t) + sizeof (long), 2);
g_print ("\n%s", s);
g_free (s);
}
else
{
g_print (" (none)\n");
}
g_print ("GDBus-debug:Address: dbus-launch stderr output:");
if (launch_stderr != NULL)
g_print ("\n%s", launch_stderr);
else
g_print (" (none)\n");
_g_dbus_debug_print_unlock ();
}
g_free (machine_id);
g_free (command_line);
g_free (launch_stdout);
g_free (launch_stderr);
if (G_UNLIKELY (restore_dbus_verbose))
{
if (old_dbus_verbose != NULL)
g_setenv ("DBUS_VERBOSE", old_dbus_verbose, TRUE);
else
g_unsetenv ("DBUS_VERBOSE");
}
g_free (old_dbus_verbose);
return ret;
}
