Re: uinput really needs a custom sleep time?

[Peter Hutterer <peter.hutterer@who-t.net>]

On Tue, Jan 31, 2017 at 12:00:40AM -0200, Marcos Paulo de Souza wrote:
> Hi input guys,
> 
> after playing with uinput, it seems an sleep call is necessary before
> emitting new events. If this really required?
> 
> While reading code of cwiid project, another user of uinput interface, it
> seems this sleep time isn't necessary[1].
> 
> In the other hang, when trying to send a simple event in my desktop, an
> sleep is necessary, take a look in my example[2].
> 
> Another interesting fact: kernel documentation lacks of an uinput example.
> Do you think this would be interesting to have one?

I'm obviously biased but imo you should really use libevdev for uinput
devices, it makes things a lot easier. Example is here:
https://www.freedesktop.org/software/libevdev/doc/latest/group__uinput.html

it also makes any sleep calls obsolete because it won't return until the
device node is available.

Cheers,
   Peter

> 
> Thanks for your time,
> Marcos
> 
> [1] https://github.com/abstrakraft/cwiid/blob/master/wminput/uinput.c#L193
> [2] https://github.com/marcosps/kernel_experiments/blob/master/userspace/uinput.c#L65
> --
> To unsubscribe from this list: send the line "unsubscribe linux-input" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>