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evdev: add a way for applications to tweak how devices are opened

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In some cases, applications (or actually, wayland compositors)
don't have the required permissions to access evdev directly, but
can do so with an external helper like weston-launch.

Allow them to do so with a custom callback that replaces the regular
open() path.

https://bugzilla.gnome.org/show_bug.cgi?id=704269
This commit is contained in:
Giovanni Campagna 2013-07-15 18:24:35 +02:00
parent 1afe757109
commit 26b2852601
2 changed files with 62 additions and 4 deletions
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49
clutter/evdev/clutter-device-manager-evdev.c
View File

@ -73,6 +73,9 @@ G_DEFINE_TYPE_WITH_PRIVATE (ClutterDeviceManagerEvdev,
clutter_device_manager_evdev,
CLUTTER_TYPE_DEVICE_MANAGER)
static ClutterOpenDeviceCallback open_callback;
static gpointer open_callback_data;
static const gchar *subsystems[] = { "input", NULL };
/*
@ -465,17 +468,33 @@ clutter_event_source_new (ClutterInputDeviceEvdev *input_device)
ClutterInputDeviceType type;
const gchar *node_path;
gint fd;
GError *error;
/* grab the udev input device node and open it */
node_path = _clutter_input_device_evdev_get_device_path (input_device);
CLUTTER_NOTE (EVENT, "Creating GSource for device %s", node_path);
fd = open (node_path, O_RDONLY | O_NONBLOCK);
if (fd < 0)
if (open_callback)
{
g_warning ("Could not open device %s: %s", node_path, strerror (errno));
return NULL;
error = NULL;
fd = open_callback (node_path, O_RDONLY | O_NONBLOCK, open_callback_data, &error);
if (fd < 0)
{
g_warning ("Could not open device %s: %s", node_path, error->message);
g_error_free (error);
return NULL;
}
}
else
{
fd = open (node_path, O_RDONLY | O_NONBLOCK);
if (fd < 0)
{
g_warning ("Could not open device %s: %s", node_path, strerror (errno));
return NULL;
}
}
/* setup the source */
@ -1119,3 +1138,25 @@ clutter_evdev_reclaim_devices (void)
priv->released = FALSE;
clutter_device_manager_evdev_probe_devices (evdev_manager);
}
/**
* clutter_evdev_set_open_callback: (skip)
* @callback: the user replacement for open()
* @user_data: user data for @callback
*
* Through this function, the application can set a custom callback
* to invoked when Clutter is about to open an evdev device. It can do
* so if special handling is needed, for example to circumvent permission
* problems.
*
* Setting @callback to %NULL will reset the default behavior.
*
* For reliable effects, this function must be called before clutter_init().
*/
void
clutter_evdev_set_open_callback (ClutterOpenDeviceCallback callback,
gpointer user_data)
{
open_callback = callback;
open_callback_data = user_data;
}

17
clutter/evdev/clutter-evdev.h
View File

@ -30,6 +30,23 @@
G_BEGIN_DECLS
/**
* ClutterOpenDeviceCallback:
* @path: the device path
* @flags: flags to be passed to open
*
* This callback will be called when Clutter needs to access an input
* device. It should return an open file descriptor for the file at @path,
* or -1 if opening failed.
*/
typedef int (*ClutterOpenDeviceCallback) (const char *path,
int flags,
gpointer user_data,
GError **error);
void clutter_evdev_set_open_callback (ClutterOpenDeviceCallback callback,
gpointer user_data);
void clutter_evdev_release_devices (void);
void clutter_evdev_reclaim_devices (void);