Hi,

On 06/13/2014 04:48 AM, Peter Hutterer wrote:
> Rather than a single global logging function, make the logging dependent on
> the individual context. This way we won't stomp on each other's feet in the
> (admittedly unusual) case of having multiple libinput contexts.
> 
> The log handler and the log priority is now a part of the libinput interface.
> We can drop the various setters and getters, the caller owns the struct anyway
> so we don't need functions to give it those values.
> 
> The userdata argument to the log handler was dropped. The caller has a ref to
> the libinput context now, any userdata can be attached to that context
> instead.
> 
> There is no need for a default log function anymore. Any serious caller should
> hook into it anyway, those that don't care can just use NULL.
> 
> There is no default log priority anymore, a caller must set the desired
> priority in the interface.
> 
> Signed-off-by: Peter Hutterer <[email protected]>
> ---
> There's a side-effect to this that I'm not sure is intended. We don't copy
> the interface into libinput, we merely keep a reference. The caller is
> already able to change open_restricted/close_restricted at runtime, though
> we can't do this ourselves (it's const).
> 
> Given that, I figured we can leave the log handler and priority up to the
> caller as well then, switching at runtime. That's the main reason for
> dropping the set/get priority calls. If that side effect wasn't intended,
> then we'll have rework a few things. Jonas?
> 
>  src/evdev-mt-touchpad-buttons.c |  15 +++--
>  src/evdev-mt-touchpad-tap.c     |  13 ++++-
>  src/evdev.c                     |  23 +++++---
>  src/libinput-private.h          |  20 ++++---
>  src/libinput.c                  |  73 ++++++-----------------
>  src/libinput.h                  |  99 +++++++++----------------------
>  src/path.c                      |  20 +++++--
>  src/timer.c                     |   4 +-
>  src/udev-seat.c                 |  17 +++---
>  test/litest.c                   |   9 +--
>  test/log.c                      | 126 
> ++++++++++++++--------------------------
>  test/misc.c                     |   2 +
>  test/path.c                     |   2 +
>  test/udev.c                     |   7 ++-
>  tools/event-debug.c             |  28 ++++-----
>  15 files changed, 194 insertions(+), 264 deletions(-)
> 
> diff --git a/src/evdev-mt-touchpad-buttons.c b/src/evdev-mt-touchpad-buttons.c
> index ce48ed0..b86f344 100644
> --- a/src/evdev-mt-touchpad-buttons.c
> +++ b/src/evdev-mt-touchpad-buttons.c
> @@ -452,6 +452,7 @@ tp_button_handle_event(struct tp_dispatch *tp,
>                      enum button_event event,
>                      uint64_t time)
>  {
> +     struct libinput *libinput = tp->device->base.seat->libinput;
>       enum button_state current = t->button.state;
>  
>       switch(t->button.state) {
> @@ -485,7 +486,8 @@ tp_button_handle_event(struct tp_dispatch *tp,
>       }
>  
>       if (current != t->button.state)
> -             log_debug("button state: from %s, event %s to %s\n",
> +             log_debug(libinput,
> +                       "button state: from %s, event %s to %s\n",
>                         button_state_to_str(current),
>                         button_event_to_str(event),
>                         button_state_to_str(t->button.state));
> @@ -538,11 +540,13 @@ tp_process_button(struct tp_dispatch *tp,
>                 const struct input_event *e,
>                 uint64_t time)
>  {
> +     struct libinput *libinput = tp->device->base.seat->libinput;
>       uint32_t mask = 1 << (e->code - BTN_LEFT);
>  
>       /* Ignore other buttons on clickpads */
>       if (tp->buttons.is_clickpad && e->code != BTN_LEFT) {
> -             log_bug_kernel("received %s button event on a clickpad\n",
> +             log_bug_kernel(libinput,
> +                            "received %s button event on a clickpad\n",
>                              libevdev_event_code_get_name(EV_KEY, e->code));
>               return 0;
>       }
> @@ -562,6 +566,7 @@ int
>  tp_init_buttons(struct tp_dispatch *tp,
>               struct evdev_device *device)
>  {
> +     struct libinput *libinput = tp->device->base.seat->libinput;
>       struct tp_touch *t;
>       int width, height;
>       double diagonal;
> @@ -574,10 +579,12 @@ tp_init_buttons(struct tp_dispatch *tp,
>       if (libevdev_has_event_code(device->evdev, EV_KEY, BTN_MIDDLE) ||
>           libevdev_has_event_code(device->evdev, EV_KEY, BTN_RIGHT)) {
>               if (tp->buttons.is_clickpad)
> -                     log_bug_kernel("clickpad advertising right button\n");
> +                     log_bug_kernel(libinput,
> +                                    "clickpad advertising right button\n");
>       } else {
>               if (!tp->buttons.is_clickpad)
> -                     log_bug_kernel("non clickpad without right button?\n");
> +                     log_bug_kernel(libinput,
> +                                    "non clickpad without right button?\n");
>       }
>  
>       width = abs(device->abs.max_x - device->abs.min_x);
> diff --git a/src/evdev-mt-touchpad-tap.c b/src/evdev-mt-touchpad-tap.c
> index 34bb0d0..2541218 100644
> --- a/src/evdev-mt-touchpad-tap.c
> +++ b/src/evdev-mt-touchpad-tap.c
> @@ -130,6 +130,7 @@ tp_tap_clear_timer(struct tp_dispatch *tp)
>  static void
>  tp_tap_idle_handle_event(struct tp_dispatch *tp, enum tap_event event, 
> uint64_t time)
>  {
> +     struct libinput *libinput = tp->device->base.seat->libinput;
>  
>       switch (event) {
>       case TAP_EVENT_TOUCH:
> @@ -138,7 +139,8 @@ tp_tap_idle_handle_event(struct tp_dispatch *tp, enum 
> tap_event event, uint64_t
>               break;
>       case TAP_EVENT_RELEASE:
>       case TAP_EVENT_MOTION:
> -             log_bug_libinput("invalid event, no fingers are down\n");
> +             log_bug_libinput(libinput,
> +                              "invalid event, no fingers are down\n");
>               break;
>       case TAP_EVENT_TIMEOUT:
>               break;
> @@ -197,11 +199,13 @@ tp_tap_hold_handle_event(struct tp_dispatch *tp, enum 
> tap_event event, uint64_t
>  static void
>  tp_tap_tapped_handle_event(struct tp_dispatch *tp, enum tap_event event, 
> uint64_t time)
>  {
> +     struct libinput *libinput = tp->device->base.seat->libinput;
>  
>       switch (event) {
>       case TAP_EVENT_MOTION:
>       case TAP_EVENT_RELEASE:
> -             log_bug_libinput("invalid event when fingers are up\n");
> +             log_bug_libinput(libinput,
> +                              "invalid event when fingers are up\n");
>               break;
>       case TAP_EVENT_TOUCH:
>               tp->tap.state = TAP_STATE_DRAGGING_OR_DOUBLETAP;
> @@ -426,7 +430,9 @@ tp_tap_dead_handle_event(struct tp_dispatch *tp, enum 
> tap_event event, uint64_t
>  static void
>  tp_tap_handle_event(struct tp_dispatch *tp, enum tap_event event, uint64_t 
> time)
>  {
> +     struct libinput *libinput = tp->device->base.seat->libinput;
>       enum tp_tap_state current;
> +
>       if (!tp->tap.enabled)
>               return;
>  
> @@ -477,7 +483,8 @@ tp_tap_handle_event(struct tp_dispatch *tp, enum 
> tap_event event, uint64_t time)
>       if (tp->tap.state == TAP_STATE_IDLE || tp->tap.state == TAP_STATE_DEAD)
>               tp_tap_clear_timer(tp);
>  
> -     log_debug("tap state: %s → %s → %s\n",
> +     log_debug(libinput,
> +               "tap state: %s → %s → %s\n",
>                 tap_state_to_str(current),
>                 tap_event_to_str(event),
>                 tap_state_to_str(tp->tap.state));
> diff --git a/src/evdev.c b/src/evdev.c
> index 51ad5e3..e099060 100644
> --- a/src/evdev.c
> +++ b/src/evdev.c
> @@ -110,6 +110,7 @@ evdev_device_transform_y(struct evdev_device *device,
>  static void
>  evdev_flush_pending_event(struct evdev_device *device, uint64_t time)
>  {
> +     struct libinput *libinput = device->base.seat->libinput;
>       struct motion_params motion;
>       int32_t cx, cy;
>       double x, y;
> @@ -142,7 +143,8 @@ evdev_flush_pending_event(struct evdev_device *device, 
> uint64_t time)
>                       break;
>  
>               if (device->mt.slots[slot].seat_slot != -1) {
> -                     log_bug_kernel("%s: Driver sent multiple touch down for 
> the "
> +                     log_bug_kernel(libinput,
> +                                    "%s: Driver sent multiple touch down for 
> the "
>                                      "same slot", device->devnode);
>                       break;
>               }
> @@ -191,7 +193,8 @@ evdev_flush_pending_event(struct evdev_device *device, 
> uint64_t time)
>                       break;
>  
>               if (device->abs.seat_slot != -1) {
> -                     log_bug_kernel("%s: Driver sent multiple touch down for 
> the "
> +                     log_bug_kernel(libinput,
> +                                    "%s: Driver sent multiple touch down for 
> the "
>                                      "same slot", device->devnode);
>                       break;
>               }
> @@ -586,6 +589,7 @@ configure_pointer_acceleration(struct evdev_device 
> *device)
>  static int
>  evdev_configure_device(struct evdev_device *device)
>  {
> +     struct libinput *libinput = device->base.seat->libinput;
>       struct libevdev *evdev = device->evdev;
>       const struct input_absinfo *absinfo;
>       int has_abs, has_rel, has_mt;
> @@ -670,7 +674,8 @@ evdev_configure_device(struct evdev_device *device)
>                   !libevdev_has_event_code(evdev, EV_KEY, BTN_TOOL_PEN) &&
>                   (has_abs || has_mt)) {
>                       device->dispatch = evdev_mt_touchpad_create(device);
> -                     log_info("input device '%s', %s is a touchpad\n",
> +                     log_info(libinput,
> +                              "input device '%s', %s is a touchpad\n",
>                                device->devname, device->devnode);
>               }
>               for (i = KEY_ESC; i < KEY_MAX; i++) {
> @@ -699,7 +704,8 @@ evdev_configure_device(struct evdev_device *device)
>  
>               device->seat_caps |= EVDEV_DEVICE_POINTER;
>  
> -             log_info("input device '%s', %s is a pointer caps =%s%s%s\n",
> +             log_info(libinput,
> +                      "input device '%s', %s is a pointer caps =%s%s%s\n",
>                        device->devname, device->devnode,
>                        has_abs ? " absolute-motion" : "",
>                        has_rel ? " relative-motion": "",
> @@ -707,12 +713,14 @@ evdev_configure_device(struct evdev_device *device)
>       }
>       if (has_keyboard) {
>               device->seat_caps |= EVDEV_DEVICE_KEYBOARD;
> -             log_info("input device '%s', %s is a keyboard\n",
> +             log_info(libinput,
> +                      "input device '%s', %s is a keyboard\n",
>                        device->devname, device->devnode);
>       }
>       if (has_touch && !has_button) {
>               device->seat_caps |= EVDEV_DEVICE_TOUCH;
> -             log_info("input device '%s', %s is a touch device\n",
> +             log_info(libinput,
> +                      "input device '%s', %s is a touch device\n",
>                        device->devname, device->devnode);
>       }
>  
> @@ -735,7 +743,8 @@ evdev_device_create(struct libinput_seat *seat,
>        * read.  mtdev_get() also expects this. */
>       fd = open_restricted(libinput, devnode, O_RDWR | O_NONBLOCK);
>       if (fd < 0) {
> -             log_info("opening input device '%s' failed (%s).\n",
> +             log_info(libinput,
> +                      "opening input device '%s' failed (%s).\n",
>                        devnode, strerror(-fd));
>               return NULL;
>       }
> diff --git a/src/libinput-private.h b/src/libinput-private.h
> index f0bda1f..43a4b88 100644
> --- a/src/libinput-private.h
> +++ b/src/libinput-private.h
> @@ -88,17 +88,21 @@ struct libinput_device {
>  typedef void (*libinput_source_dispatch_t)(void *data);
>  
>  
> -#define log_debug(...) log_msg(LIBINPUT_LOG_PRIORITY_DEBUG, __VA_ARGS__)
> -#define log_info(...) log_msg(LIBINPUT_LOG_PRIORITY_INFO, __VA_ARGS__)
> -#define log_error(...) log_msg(LIBINPUT_LOG_PRIORITY_ERROR, __VA_ARGS__)
> -#define log_bug_kernel(...) log_msg(LIBINPUT_LOG_PRIORITY_ERROR, "kernel 
> bug: " __VA_ARGS__)
> -#define log_bug_libinput(...) log_msg(LIBINPUT_LOG_PRIORITY_ERROR, "libinput 
> bug: " __VA_ARGS__);
> -#define log_bug_client(...) log_msg(LIBINPUT_LOG_PRIORITY_ERROR, "client 
> bug: " __VA_ARGS__);
> +#define log_debug(li_, ...) log_msg((li_), LIBINPUT_LOG_PRIORITY_DEBUG, 
> __VA_ARGS__)
> +#define log_info(li_, ...) log_msg((li_), LIBINPUT_LOG_PRIORITY_INFO, 
> __VA_ARGS__)
> +#define log_error(li_, ...) log_msg((li_), LIBINPUT_LOG_PRIORITY_ERROR, 
> __VA_ARGS__)
> +#define log_bug_kernel(li_, ...) log_msg((li_), LIBINPUT_LOG_PRIORITY_ERROR, 
> "kernel bug: " __VA_ARGS__)
> +#define log_bug_libinput(li_, ...) log_msg((li_), 
> LIBINPUT_LOG_PRIORITY_ERROR, "libinput bug: " __VA_ARGS__);
> +#define log_bug_client(li_, ...) log_msg((li_), LIBINPUT_LOG_PRIORITY_ERROR, 
> "client bug: " __VA_ARGS__);
>  
>  void
> -log_msg(enum libinput_log_priority priority, const char *format, ...);
> +log_msg(const struct libinput *libinput,
> +     enum libinput_log_priority priority,
> +     const char *format, ...);
> +
>  void
> -log_msg_va(enum libinput_log_priority priority,
> +log_msg_va(const struct libinput *libinput,
> +        enum libinput_log_priority priority,
>          const char *format,
>          va_list args);
>  
> diff --git a/src/libinput.c b/src/libinput.c
> index 5b10a10..5521375 100644
> --- a/src/libinput.c
> +++ b/src/libinput.c
> @@ -80,75 +80,29 @@ struct libinput_event_touch {
>       double y;
>  };
>  
> -static void
> -libinput_default_log_func(enum libinput_log_priority priority,
> -                       void *data,
> -                       const char *format, va_list args)
> -{
> -     const char *prefix;
> -
> -     switch(priority) {
> -     case LIBINPUT_LOG_PRIORITY_DEBUG: prefix = "debug"; break;
> -     case LIBINPUT_LOG_PRIORITY_INFO: prefix = "info"; break;
> -     case LIBINPUT_LOG_PRIORITY_ERROR: prefix = "error"; break;
> -     default: prefix="<invalid priority>"; break;
> -     }
> -
> -     fprintf(stderr, "libinput %s: ", prefix);
> -     vfprintf(stderr, format, args);
> -}
> -
> -struct log_data {
> -     enum libinput_log_priority priority;
> -     libinput_log_handler handler;
> -     void *user_data;
> -};
> -
> -static struct log_data log_data = {
> -     .priority = LIBINPUT_LOG_PRIORITY_ERROR,
> -     .handler = libinput_default_log_func,
> -     .user_data = NULL,
> -};
> -
>  void
> -log_msg_va(enum libinput_log_priority priority,
> +log_msg_va(const struct libinput *libinput,
> +        enum libinput_log_priority priority,
>          const char *format,
>          va_list args)
>  {
> -     if (log_data.handler && log_data.priority <= priority)
> -             log_data.handler(priority, log_data.user_data, format, args);
> +     if (libinput->interface->log_handler &&
> +         libinput->interface->log_priority <= priority)
> +             libinput->interface->log_handler(libinput, priority, format, 
> args);
>  }
>  
>  void
> -log_msg(enum libinput_log_priority priority, const char *format, ...)
> +log_msg(const struct libinput *libinput,
> +     enum libinput_log_priority priority,
> +     const char *format, ...)
>  {
>       va_list args;
>  
>       va_start(args, format);
> -     log_msg_va(priority, format, args);
> +     log_msg_va(libinput, priority, format, args);
>       va_end(args);
>  }
>  
> -LIBINPUT_EXPORT void
> -libinput_log_set_priority(enum libinput_log_priority priority)
> -{
> -     log_data.priority = priority;
> -}
> -
> -LIBINPUT_EXPORT enum libinput_log_priority
> -libinput_log_get_priority(void)
> -{
> -     return log_data.priority;
> -}
> -
> -LIBINPUT_EXPORT void
> -libinput_log_set_handler(libinput_log_handler log_handler,
> -                      void *user_data)
> -{
> -     log_data.handler = log_handler;
> -     log_data.user_data = user_data;
> -}
> -
>  static void
>  libinput_post_event(struct libinput *libinput,
>                   struct libinput_event *event);
> @@ -476,6 +430,15 @@ libinput_init(struct libinput *libinput,
>             const struct libinput_interface_backend *interface_backend,
>             void *user_data)
>  {
> +     switch (interface->log_priority) {
> +     case LIBINPUT_LOG_PRIORITY_DEBUG:
> +     case LIBINPUT_LOG_PRIORITY_INFO:
> +     case LIBINPUT_LOG_PRIORITY_ERROR:
> +             break;
> +     default:
> +             return -1;
> +     }
> +
>       libinput->epoll_fd = epoll_create1(EPOLL_CLOEXEC);;
>       if (libinput->epoll_fd < 0)
>               return -1;
> diff --git a/src/libinput.h b/src/libinput.h
> index 4501c66..c48d708 100644
> --- a/src/libinput.h
> +++ b/src/libinput.h
> @@ -759,6 +759,23 @@ libinput_event_touch_get_base_event(struct 
> libinput_event_touch *event);
>   * @defgroup base Initialization and manipulation of libinput contexts
>   */
>  
> +/**
> + * @ingroup base
> + *
> + * Log handler type for custom logging.
> + *
> + * @param libinput The libinput context
> + * @param priority The priority of the current message
> + * @param format Message format in printf-style
> + * @param args Message arguments
> + *
> + * @see libinput_set_log_priority
> + */
> +typedef void (*libinput_log_handler)(const struct libinput *libinput,
> +                                  enum libinput_log_priority priority,
> +                                  const char *format, va_list args)
> +        LIBINPUT_ATTRIBUTE_PRINTF(3, 0);
> +
>  struct libinput_interface {
>       /**
>        * Open the device at the given path with the flags provided and
> @@ -780,6 +797,18 @@ struct libinput_interface {
>        * libinput_udev_create_for_seat()
>        */
>       void (*close_restricted)(int fd, void *user_data);
> +
> +     /**
> +      * The log handler to be called for internal log messages. Using
> +      * NULL is permitted but not recommended.
> +      */
> +     libinput_log_handler log_handler;
> +
> +     /**
> +      * The log priority for this context. This priority may be changed
> +      * at runtime and takes effect for the next log message.
> +      */
> +     enum libinput_log_priority log_priority;
>  };
>  
>  /**
> @@ -1025,76 +1054,6 @@ void
>  libinput_destroy(struct libinput *libinput);
>  
>  /**
> - * @ingroup base
> - *
> - * Set the global log priority. Messages with priorities equal to or
> - * higher than the argument will be printed to the current log handler.
> - *
> - * The default log priority is LIBINPUT_LOG_PRIORITY_ERROR.
> - *
> - * @param priority The minimum priority of log messages to print.
> - *
> - * @see libinput_log_set_handler
> - * @see libinput_log_get_priority
> - */
> -void
> -libinput_log_set_priority(enum libinput_log_priority priority);
> -
> -/**
> - * @ingroup base
> - *
> - * Get the global log priority. Messages with priorities equal to or
> - * higher than the argument will be printed to the current log handler.
> - *
> - * The default log priority is LIBINPUT_LOG_PRIORITY_ERROR.
> - *
> - * @return The minimum priority of log messages to print.
> - *
> - * @see libinput_log_set_handler
> - * @see libinput_log_set_priority
> - */
> -enum libinput_log_priority
> -libinput_log_get_priority(void);
> -
> -/**
> - * @ingroup base
> - *
> - * Log handler type for custom logging.
> - *
> - * @param priority The priority of the current message
> - * @param user_data Caller-specific data pointer as previously passed into
> - * libinput_log_set_handler()
> - * @param format Message format in printf-style
> - * @param args Message arguments
> - *
> - * @see libinput_set_log_priority
> - * @see libinput_log_set_handler
> - */
> -typedef void (*libinput_log_handler)(enum libinput_log_priority priority,
> -                                  void *user_data,
> -                                  const char *format, va_list args)
> -        LIBINPUT_ATTRIBUTE_PRINTF(3, 0);
> -
> -/**
> - * @ingroup base
> - *
> - * Set the global log handler. Messages with priorities equal to or higher
> - * than the current log priority will be passed to the given
> - * log handler.
> - *
> - * The default log handler prints to stderr.
> - *
> - * @param log_handler The log handler for library messages.
> - * @param user_data Caller-specific data pointer, passed into the log
> - * handler.
> - *
> - * @see libinput_log_set_handler
> - */
> -void
> -libinput_log_set_handler(libinput_log_handler log_handler,
> -                      void *user_data);
> -
> -/**
>   * @defgroup seat Initialization and manipulation of seats
>   *
>   * A seat has two identifiers, the physical name and the logical name. The

Your removing a bunch of exported symbols here, so you should also bump
the soname to indicate ABI breakage.

Other then that this looks good to me and is:

Reviewed-by: Hans de Goede <[email protected]>

Regards,

Hans

> diff --git a/src/path.c b/src/path.c
> index 27e5ad6..e9c0ee8 100644
> --- a/src/path.c
> +++ b/src/path.c
> @@ -160,7 +160,9 @@ path_device_enable(struct path_input *input, const char 
> *devnode)
>  
>       if (path_get_udev_properties(devnode, &sysname,
>                                    &seat_name, &seat_logical_name) == -1) {
> -             log_info("failed to obtain sysname for device '%s'.\n", 
> devnode);
> +             log_info(&input->base,
> +                      "failed to obtain sysname for device '%s'.\n",
> +                      devnode);
>               return NULL;
>       }
>  
> @@ -171,7 +173,9 @@ path_device_enable(struct path_input *input, const char 
> *devnode)
>       } else {
>               seat = path_seat_create(input, seat_name, seat_logical_name);
>               if (!seat) {
> -                     log_info("failed to create seat for device '%s'.\n", 
> devnode);
> +                     log_info(&input->base,
> +                              "failed to create seat for device '%s'.\n",
> +                              devnode);
>                       goto out;
>               }
>       }
> @@ -181,10 +185,14 @@ path_device_enable(struct path_input *input, const char 
> *devnode)
>  
>       if (device == EVDEV_UNHANDLED_DEVICE) {
>               device = NULL;
> -             log_info("not using input device '%s'.\n", devnode);
> +             log_info(&input->base,
> +                      "not using input device '%s'.\n",
> +                      devnode);
>               goto out;
>       } else if (device == NULL) {
> -             log_info("failed to create input device '%s'.\n", devnode);
> +             log_info(&input->base,
> +                      "failed to create input device '%s'.\n",
> +                      devnode);
>               goto out;
>       }
>  
> @@ -264,7 +272,7 @@ libinput_path_add_device(struct libinput *libinput,
>       struct libinput_device *device;
>  
>       if (libinput->interface_backend != &interface_backend) {
> -             log_bug_client("Mismatching backends.\n");
> +             log_bug_client(libinput, "Mismatching backends.\n");
>               return NULL;
>       }
>  
> @@ -301,7 +309,7 @@ libinput_path_remove_device(struct libinput_device 
> *device)
>       struct path_device *dev;
>  
>       if (libinput->interface_backend != &interface_backend) {
> -             log_bug_client("Mismatching backends.\n");
> +             log_bug_client(libinput, "Mismatching backends.\n");
>               return;
>       }
>  
> diff --git a/src/timer.c b/src/timer.c
> index 65fdd17..f546185 100644
> --- a/src/timer.c
> +++ b/src/timer.c
> @@ -59,7 +59,7 @@ libinput_timer_arm_timer_fd(struct libinput *libinput)
>  
>       r = timerfd_settime(libinput->timer.fd, TFD_TIMER_ABSTIME, &its, NULL);
>       if (r)
> -             log_error("timerfd_settime error: %s\n", strerror(errno));
> +             log_error(libinput, "timerfd_settime error: %s\n", 
> strerror(errno));
>  }
>  
>  void
> @@ -96,7 +96,7 @@ libinput_timer_handler(void *data)
>  
>       r = clock_gettime(CLOCK_MONOTONIC, &ts);
>       if (r) {
> -             log_error("clock_gettime error: %s\n", strerror(errno));
> +             log_error(libinput, "clock_gettime error: %s\n", 
> strerror(errno));
>               return;
>       }
>  
> diff --git a/src/udev-seat.c b/src/udev-seat.c
> index 1e1307b..1758b4e 100644
> --- a/src/udev-seat.c
> +++ b/src/udev-seat.c
> @@ -80,10 +80,10 @@ device_added(struct udev_device *udev_device, struct 
> udev_input *input)
>       libinput_seat_unref(&seat->base);
>  
>       if (device == EVDEV_UNHANDLED_DEVICE) {
> -             log_info("not using input device '%s'.\n", devnode);
> +             log_info(&input->base, "not using input device '%s'.\n", 
> devnode);
>               return 0;
>       } else if (device == NULL) {
> -             log_info("failed to create input device '%s'.\n", devnode);
> +             log_info(&input->base, "failed to create input device '%s'.\n", 
> devnode);
>               return 0;
>       }
>  
> @@ -100,7 +100,8 @@ device_added(struct udev_device *udev_device, struct 
> udev_input *input)
>                                        &device->abs.calibration[4],
>                                        &device->abs.calibration[5]) == 6) {
>               device->abs.apply_calibration = 1;
> -             log_info("Applying calibration: %f %f %f %f %f %f\n",
> +             log_info(&input->base,
> +                      "Applying calibration: %f %f %f %f %f %f\n",
>                        device->abs.calibration[0],
>                        device->abs.calibration[1],
>                        device->abs.calibration[2],
> @@ -128,7 +129,8 @@ device_removed(struct udev_device *udev_device, struct 
> udev_input *input)
>               list_for_each_safe(device, next,
>                                  &seat->base.devices_list, base.link) {
>                       if (!strcmp(device->devnode, devnode)) {
> -                             log_info("input device %s, %s removed\n",
> +                             log_info(&input->base,
> +                                      "input device %s, %s removed\n",
>                                        device->devname, device->devnode);
>                               evdev_device_remove(device);
>                               break;
> @@ -243,7 +245,8 @@ udev_input_enable(struct libinput *libinput)
>  
>       input->udev_monitor = udev_monitor_new_from_netlink(udev, "udev");
>       if (!input->udev_monitor) {
> -             log_info("udev: failed to create the udev monitor\n");
> +             log_info(libinput,
> +                      "udev: failed to create the udev monitor\n");
>               return -1;
>       }
>  
> @@ -251,7 +254,7 @@ udev_input_enable(struct libinput *libinput)
>                       "input", NULL);
>  
>       if (udev_monitor_enable_receiving(input->udev_monitor)) {
> -             log_info("udev: failed to bind the udev monitor\n");
> +             log_info(libinput, "udev: failed to bind the udev monitor\n");
>               udev_monitor_unref(input->udev_monitor);
>               input->udev_monitor = NULL;
>               return -1;
> @@ -367,7 +370,7 @@ libinput_udev_set_seat(struct libinput *libinput,
>               return -1;
>  
>       if (libinput->interface_backend != &interface_backend) {
> -             log_bug_client("Mismatching backends.\n");
> +             log_bug_client(libinput, "Mismatching backends.\n");
>               return -1;
>       }
>  
> diff --git a/test/litest.c b/test/litest.c
> index d3f8f0d..560e8e5 100644
> --- a/test/litest.c
> +++ b/test/litest.c
> @@ -250,8 +250,8 @@ litest_list_tests(struct list *tests)
>  }
>  
>  static void
> -litest_log_handler(enum libinput_log_priority pri,
> -                void *user_data,
> +litest_log_handler(const struct libinput *libinput,
> +                enum libinput_log_priority pri,
>                  const char *format,
>                  va_list args)
>  {
> @@ -282,6 +282,8 @@ close_restricted(int fd, void *userdata)
>  struct libinput_interface interface = {
>       .open_restricted = open_restricted,
>       .close_restricted = close_restricted,
> +     .log_handler = litest_log_handler,
> +     .log_priority = LIBINPUT_LOG_PRIORITY_ERROR,
>  };
>  
>  static const struct option opts[] = {
> @@ -321,8 +323,7 @@ litest_run(int argc, char **argv) {
>                               litest_list_tests(&all_tests);
>                               return 0;
>                       case 'v':
> -                             
> libinput_log_set_priority(LIBINPUT_LOG_PRIORITY_DEBUG);
> -                             libinput_log_set_handler(litest_log_handler, 
> NULL);
> +                             interface.log_priority = 
> LIBINPUT_LOG_PRIORITY_DEBUG;
>                               break;
>                       default:
>                               fprintf(stderr, "usage: %s [--list]\n", 
> argv[0]);
> diff --git a/test/log.c b/test/log.c
> index a281820..a430c03 100644
> --- a/test/log.c
> +++ b/test/log.c
> @@ -30,9 +30,10 @@
>  #include <unistd.h>
>  
>  #include "litest.h"
> +#include "libinput-util.h"
>  
>  static int log_handler_called;
> -static void *log_handler_userdata;
> +static struct libinput *log_context;
>  
>  static int open_restricted(const char *path, int flags, void *data)
>  {
> @@ -45,146 +46,109 @@ static void close_restricted(int fd, void *data)
>       close(fd);
>  }
>  
> -const struct libinput_interface simple_interface = {
> -     .open_restricted = open_restricted,
> -     .close_restricted = close_restricted,
> -};
> -
>  static void
> -simple_log_handler(enum libinput_log_priority priority,
> -                void *userdata,
> +simple_log_handler(const struct libinput *libinput,
> +                enum libinput_log_priority priority,
>                  const char *format,
>                  va_list args)
>  {
>       log_handler_called++;
> -     ck_assert(userdata == log_handler_userdata);
>       ck_assert(format != NULL);
> +     ck_assert(libinput != NULL);
> +     if (log_context)
> +             ck_assert(libinput == log_context);
>  }
>  
> -START_TEST(log_default_priority)
> +struct libinput_interface simple_interface = {
> +     .open_restricted = open_restricted,
> +     .close_restricted = close_restricted,
> +     .log_handler = simple_log_handler,
> +     .log_priority = LIBINPUT_LOG_PRIORITY_DEBUG,
> +};
> +
> +static void
> +simple_interface_reset(void)
>  {
> -     enum libinput_log_priority pri;
> +     simple_interface.open_restricted = open_restricted;
> +     simple_interface.close_restricted = close_restricted;
> +     simple_interface.log_handler = simple_log_handler;
> +     simple_interface.log_priority = LIBINPUT_LOG_PRIORITY_DEBUG;
>  
> -     pri = libinput_log_get_priority();
> -
> -     ck_assert_int_eq(pri, LIBINPUT_LOG_PRIORITY_ERROR);
> +     log_context = NULL;
> +     log_handler_called = 0;
>  }
> -END_TEST
>  
>  START_TEST(log_handler_invoked)
>  {
>       struct libinput *li;
> -     enum libinput_log_priority pri = libinput_log_get_priority();
> -
> -     libinput_log_set_priority(LIBINPUT_LOG_PRIORITY_DEBUG);
> -     libinput_log_set_handler(simple_log_handler, NULL);
> -     log_handler_userdata = NULL;
> -
> -     li = libinput_path_create_context(&simple_interface, NULL);
> -     libinput_path_add_device(li, "/tmp");
> -
> -     ck_assert_int_gt(log_handler_called, 0);
> -     log_handler_called = 0;
> -
> -     libinput_destroy(li);
> -     libinput_log_set_priority(pri);
> -}
> -END_TEST
> -
> -START_TEST(log_userdata_NULL)
> -{
> -     struct libinput *li;
> -     enum libinput_log_priority pri = libinput_log_get_priority();
> -
> -     libinput_log_set_priority(LIBINPUT_LOG_PRIORITY_DEBUG);
> -     libinput_log_set_handler(simple_log_handler, NULL);
> -     log_handler_userdata = NULL;
>  
>       li = libinput_path_create_context(&simple_interface, NULL);
> -     libinput_path_add_device(li, "/tmp");
> -
> -     ck_assert_int_gt(log_handler_called, 0);
> -     log_handler_called = 0;
> -
> -     libinput_destroy(li);
> +     ck_assert_notnull(li);
> +     log_context = li;
>  
> -     libinput_log_set_priority(pri);
> -}
> -END_TEST
> -
> -START_TEST(log_userdata)
> -{
> -     struct libinput *li;
> -     enum libinput_log_priority pri = libinput_log_get_priority();
> -
> -     libinput_log_set_priority(LIBINPUT_LOG_PRIORITY_DEBUG);
> -     libinput_log_set_handler(simple_log_handler, &li);
> -     log_handler_userdata = &li;
> -
> -     li = libinput_path_create_context(&simple_interface, NULL);
>       libinput_path_add_device(li, "/tmp");
> -
>       ck_assert_int_gt(log_handler_called, 0);
> -     log_handler_called = 0;
>  
>       libinput_destroy(li);
> -     libinput_log_set_priority(pri);
> +     simple_interface_reset();
>  }
>  END_TEST
>  
>  START_TEST(log_handler_NULL)
>  {
>       struct libinput *li;
> -     enum libinput_log_priority pri = libinput_log_get_priority();
> -
> -     libinput_log_set_priority(LIBINPUT_LOG_PRIORITY_DEBUG);
> -     libinput_log_set_handler(NULL, NULL);
> -     log_handler_userdata = NULL;
>  
> +     simple_interface.log_handler = NULL;
> +     simple_interface.log_priority = LIBINPUT_LOG_PRIORITY_DEBUG;
>       li = libinput_path_create_context(&simple_interface, NULL);
>       libinput_path_add_device(li, "/tmp");
>  
>       ck_assert_int_eq(log_handler_called, 0);
> -     log_handler_called = 0;
> -     libinput_log_set_handler(simple_log_handler, NULL);
>  
>       libinput_destroy(li);
> -     libinput_log_set_priority(pri);
> +     simple_interface_reset();
>  }
>  END_TEST
>  
>  START_TEST(log_priority)
>  {
>       struct libinput *li;
> -     enum libinput_log_priority pri = libinput_log_get_priority();
>  
> -     libinput_log_set_priority(LIBINPUT_LOG_PRIORITY_ERROR);
> -     libinput_log_set_handler(simple_log_handler, NULL);
> -     log_handler_userdata = NULL;
> +     simple_interface.log_priority = LIBINPUT_LOG_PRIORITY_ERROR;
>  
>       li = libinput_path_create_context(&simple_interface, NULL);
>       libinput_path_add_device(li, "/tmp");
>  
>       ck_assert_int_eq(log_handler_called, 0);
>  
> -     libinput_log_set_priority(LIBINPUT_LOG_PRIORITY_INFO);
> +     simple_interface.log_priority = LIBINPUT_LOG_PRIORITY_INFO;
>       libinput_path_add_device(li, "/tmp");
>       ck_assert_int_gt(log_handler_called, 0);
>  
> -     log_handler_called = 0;
>  
>       libinput_destroy(li);
> -     libinput_log_set_priority(pri);
> +     simple_interface_reset();
> +}
> +END_TEST
> +
> +START_TEST(log_invalid_priority)
> +{
> +     struct libinput *li;
> +
> +     simple_interface.log_priority = 0xFF;
> +
> +     li = libinput_path_create_context(&simple_interface, NULL);
> +     ck_assert(li == NULL);
> +
> +     simple_interface_reset();
>  }
>  END_TEST
>  
>  int main (int argc, char **argv) {
> -     litest_add_no_device("log:defaults", log_default_priority);
>       litest_add_no_device("log:logging", log_handler_invoked);
>       litest_add_no_device("log:logging", log_handler_NULL);
> -     litest_add_no_device("log:logging", log_userdata);
> -     litest_add_no_device("log:logging", log_userdata_NULL);
>       litest_add_no_device("log:logging", log_priority);
> +     litest_add_no_device("log:logging", log_invalid_priority);
>  
>       return litest_run(argc, argv);
>  }
> diff --git a/test/misc.c b/test/misc.c
> index 133bdb6..f4a3c43 100644
> --- a/test/misc.c
> +++ b/test/misc.c
> @@ -43,6 +43,8 @@ static void close_restricted(int fd, void *data)
>  const struct libinput_interface simple_interface = {
>       .open_restricted = open_restricted,
>       .close_restricted = close_restricted,
> +     .log_handler = NULL,
> +     .log_priority = LIBINPUT_LOG_PRIORITY_ERROR,
>  };
>  
>  static struct libevdev_uinput *
> diff --git a/test/path.c b/test/path.c
> index 24f60e0..20553c3 100644
> --- a/test/path.c
> +++ b/test/path.c
> @@ -51,6 +51,8 @@ static void close_restricted(int fd, void *data)
>  const struct libinput_interface simple_interface = {
>       .open_restricted = open_restricted,
>       .close_restricted = close_restricted,
> +     .log_handler = NULL,
> +     .log_priority = LIBINPUT_LOG_PRIORITY_ERROR,
>  };
>  
>  
> diff --git a/test/udev.c b/test/udev.c
> index 996bc02..5684718 100644
> --- a/test/udev.c
> +++ b/test/udev.c
> @@ -45,13 +45,14 @@ static void close_restricted(int fd, void *data)
>  const struct libinput_interface simple_interface = {
>       .open_restricted = open_restricted,
>       .close_restricted = close_restricted,
> +     .log_handler = NULL,
> +     .log_priority = LIBINPUT_LOG_PRIORITY_ERROR,
>  };
>  
>  
>  START_TEST(udev_create_NULL)
>  {
>       struct libinput *li;
> -     const struct libinput_interface interface;
>       struct udev *udev;
>  
>       udev = udev_new();
> @@ -59,13 +60,13 @@ START_TEST(udev_create_NULL)
>       li = libinput_udev_create_context(NULL, NULL, NULL);
>       ck_assert(li == NULL);
>  
> -     li = libinput_udev_create_context(&interface, NULL, NULL);
> +     li = libinput_udev_create_context(&simple_interface, NULL, NULL);
>       ck_assert(li == NULL);
>  
>       li = libinput_udev_create_context(NULL, NULL, udev);
>       ck_assert(li == NULL);
>  
> -     li = libinput_udev_create_context(&interface, NULL, udev);
> +     li = libinput_udev_create_context(&simple_interface, NULL, udev);
>       ck_assert(li != NULL);
>       ck_assert_int_eq(libinput_udev_set_seat(li, NULL), -1);
>       libinput_destroy(li);
> diff --git a/tools/event-debug.c b/tools/event-debug.c
> index af3f648..e3df8dd 100644
> --- a/tools/event-debug.c
> +++ b/tools/event-debug.c
> @@ -126,9 +126,20 @@ close_restricted(int fd, void *user_data)
>       close(fd);
>  }
>  
> -static const struct libinput_interface interface = {
> +static void
> +log_handler(const struct libinput *li,
> +         enum libinput_log_priority priority,
> +         const char *format,
> +         va_list args)
> +{
> +     vprintf(format, args);
> +}
> +
> +static struct libinput_interface interface = {
>       .open_restricted = open_restricted,
>       .close_restricted = close_restricted,
> +     .log_handler = log_handler,
> +     .log_priority = LIBINPUT_LOG_PRIORITY_ERROR,
>  };
>  
>  static int
> @@ -438,15 +449,6 @@ mainloop(struct libinput *li)
>       close(fds[1].fd);
>  }
>  
> -static void
> -log_handler(enum libinput_log_priority priority,
> -         void *user_data,
> -         const char *format,
> -         va_list args)
> -{
> -     vprintf(format, args);
> -}
> -
>  int
>  main(int argc, char **argv)
>  {
> @@ -456,10 +458,8 @@ main(int argc, char **argv)
>       if (parse_args(argc, argv))
>               return 1;
>  
> -     if (verbose) {
> -             libinput_log_set_handler(log_handler, NULL);
> -             libinput_log_set_priority(LIBINPUT_LOG_PRIORITY_DEBUG);
> -     }
> +     if (verbose)
> +             interface.log_priority = LIBINPUT_LOG_PRIORITY_DEBUG;
>  
>       if (mode == MODE_UDEV) {
>               if (open_udev(&li))
> 
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