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libinput: fail if no input found on init

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This runs through events pending at init on initialization so we can
tell if some devices are available.

Note that with the way wlr_device_lists is managed, this checks that
there is at least one device we handle - it doesn't have to be a
keyboard, but there is at least a mouse or tablet_pad or something
that we care about.

Instead of failing inconditionally it might be better to leave the
decision to the user, e.g. add a "backend_has_devices" function to
call later.

(Tested by moving /dev/input off)

Fixes #24.
This commit is contained in:
Dominique Martinet 2017-08-16 08:48:03 +02:00
parent 19d6442f52
commit 880c239657
1 changed files with 11 additions and 3 deletions
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14
backend/libinput/backend.c
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@ -63,14 +63,22 @@ static bool wlr_libinput_backend_start(struct wlr_backend *_backend) {
libinput_log_set_handler(backend->libinput_context, wlr_libinput_log);
libinput_log_set_priority(backend->libinput_context, LIBINPUT_LOG_PRIORITY_ERROR);
int libinput_fd = libinput_get_fd(backend->libinput_context);
if (backend->wlr_device_lists->length == 0) {
wlr_libinput_readable(libinput_fd, WL_EVENT_READABLE, backend);
if (backend->wlr_device_lists->length == 0) {
wlr_log(L_ERROR, "No input device found, failing initialization");
return false;
}
}
struct wl_event_loop *event_loop =
wl_display_get_event_loop(backend->display);
if (backend->input_event) {
wl_event_source_remove(backend->input_event);
}
backend->input_event = wl_event_loop_add_fd(event_loop,
libinput_get_fd(backend->libinput_context), WL_EVENT_READABLE,
wlr_libinput_readable, backend);
backend->input_event = wl_event_loop_add_fd(event_loop, libinput_fd,
WL_EVENT_READABLE, wlr_libinput_readable, backend);
if (!backend->input_event) {
wlr_log(L_ERROR, "Failed to create input event on event loop");
return false;