osx man page for tk_getuserinactivetime

Tk_GetUserInactiveTime(3)				       Tk Library Procedures					 Tk_GetUserInactiveTime(3)

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NAME
       Tk_GetUserInactiveTime, Tk_ResetUserInactiveTime - discover user inactivity time

SYNOPSIS
       #include <tk.h>

       long
       Tk_GetUserInactiveTime(display)

       Tk_GetUserInactiveTime(display)

ARGUMENTS
       Display *display (in)	      The display on which the user inactivity timer is to be queried or reset.
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DESCRIPTION
       Tk_GetUserInactiveTime  returns the number of milliseconds that have passed since the last user interaction (usually via keyboard or mouse)
       with the respective display. On systems and displays that do not support querying the user inactiviy time, -1 is returned.  Tk_GetUserInac-
       tiveTime resets the user inactivity timer of the given display to zero.	On windowing systems that do not support multiple displays display
       can be passed as NULL.

KEYWORDS
       idle, inactive

Tk									8.5						 Tk_GetUserInactiveTime(3)