On Thu, Jan 20, 2022 at 08:44:01PM +0800, Po Lu wrote:
> I recall there being a function in the Emacs sources to construct a
> `struct timespec' from a floating point number denoting seconds.

That might be `time-convert':

  (let* ((tim0 (current-time))
         (ftim (float-time tim0))
	 (tim1 (time-convert ftim)))
    (message "tim0: %S ftim: %S tim1: %S\n" tim0 ftim tim1))

  => tim0: (25065 42935 269749 160000) ftim: 1642702775.2697492 tim1: (25065 42935 269749 164581)

(some stuff in the lower bits seems to get lost in translation, alas :)

> I would like to use it to allow setting `polling-period' to a period
> less than one second, so that C-g can be detected faster in the NS port.
> 
> Does anyone remember the name of that function, if it does exist?  I
> don't want to reinvent the wheel.

HTH
-- 
t