write EV_SYN input_event along with led events to device

Other clients of an evdev device need to have the events they receive
be separated, in moment in time, from other events by an EV_SYN/
SYN_REPORT. This is the responsibility of the client who writes events
into the stream.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@gmail.com>

diff --git a/libevdev/libevdev.c b/libevdev/libevdev.c
index 25d33e75b1ed15a052361577ff221435fbeb992c..ba5b17fab680891945954a14762d28b3ee3914f1 100644 (file)
--- a/libevdev/libevdev.c
+++ b/libevdev/libevdev.c
@@ -1189,7 +1189,7 @@ libevdev_kernel_set_led_value(struct libevdev *dev, unsigned int code, enum Evde
 int
 libevdev_kernel_set_led_values(struct libevdev *dev, ...)
 {
-       struct input_event ev[LED_MAX];
+       struct input_event ev[LED_MAX + 1];
        enum EvdevLEDValues val;
        va_list args;
        int code;
@@ -1228,8 +1228,12 @@ libevdev_kernel_set_led_values(struct libevdev *dev, ...)
        va_end(args);
 
        if (rc == 0 && nleds > 0) {
+               ev[nleds].type = EV_SYN;
+               ev[nleds++].code = SYN_REPORT;
+
                rc = write(libevdev_get_fd(dev), ev, nleds * sizeof(ev[0]));
                if (rc > 0) {
+                       nleds--; /* last is EV_SYN */
                        while (nleds--)
                                update_led_state(dev, &ev[nleds]);
                }