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    Input: add infrastructure for selecting clockid for event time stamps · a80b83b7
    John Stultz 提交于
    As noted by Arve and others, since wall time can jump backwards, it is
    difficult to use for input because one cannot determine if one event
    occurred before another or for how long a key was pressed.
    
    However, the timestamp field is part of the kernel ABI, and cannot be
    changed without possibly breaking existing users.
    
    This patch adds a new IOCTL that allows a clockid to be set in the
    evdev_client struct that will specify which time base to use for event
    timestamps (ie: CLOCK_MONOTONIC instead of CLOCK_REALTIME).
    
    For now we only support CLOCK_MONOTONIC and CLOCK_REALTIME, but
    in the future we could support other clockids if appropriate.
    
    The default remains CLOCK_REALTIME, so we don't change the ABI.
    Signed-off-by: NJohn Stultz <john.stultz@linaro.org>
    Reviewed-by: NDaniel Kurtz <djkurtz@google.com>
    Signed-off-by: NDmitry Torokhov <dtor@mail.ru>
    a80b83b7
input.h 48.1 KB