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Tcl_GetTime(3)		    Tcl Library Procedures		Tcl_GetTime(3)

______________________________________________________________________________

NAME
       Tcl_GetTime, Tcl_SetTimeProc, Tcl_QueryTimeProc - get date and time

SYNOPSIS
       #include <tcl.h>

       Tcl_GetTime(timePtr)

       Tcl_SetTimeProc(getProc, scaleProc, clientData)

       Tcl_QueryTimeProc(getProcPtr, scaleProcPtr, clientDataPtr)

ARGUMENTS
       Tcl_Time *timePtr (out)		      Points  to  memory  in  which to
					      store the date and time informa‐
					      tion.

       Tcl_GetTimeProc getProc (in)	      Pointer	to   handler  function
					      replacing	 Tcl_GetTime's	access
					      to the OS.

       Tcl_ScaleTimeProc scaleProc (in)	      Pointer  to handler function for
					      the conversion of time delays in
					      the virtual domain to real-time.

       ClientData clientData (in)	      Value  passed through to the two
					      handler functions.

       Tcl_GetTimeProc *getProcPtr (out)      Pointer to place	the  currently
					      registered  get handler function
					      into.

       Tcl_ScaleTimeProc *scaleProcPtr (out)  Pointer to place	the  currently
					      registered  scale	 handler func‐
					      tion into.

       ClientData *clientDataPtr (out)	      Pointer to place	the  currently
					      registered   pass-through	 value
					      into.
_________________________________________________________________

DESCRIPTION
       The Tcl_GetTime function retrieves  the	current	 time  as  a  Tcl_Time
       structure  in  memory the caller provides.  This structure has the fol‐
       lowing definition:

	      typedef struct Tcl_Time {
		  long sec;
		  long usec;
	      } Tcl_Time;

       On return, the sec member of the structure is filled in with the number
       of seconds that have elapsed since the epoch: the epoch is the point in
       time of 00:00 UTC, 1 January 1970.  This number	does  not  count  leap
       seconds	-  an interval of one day advances it by 86400 seconds regard‐
       less of whether a leap second has been inserted.

       The usec member of the structure	 is  filled  in	 with  the  number  of
       microseconds that have elapsed since the start of the second designated
       by sec.	The Tcl library makes every effort to keep this number as pre‐
       cise  as	 possible,  subject to the limitations of the computer system.
       On multiprocessor variants of Windows, this number may  be  limited  to
       the 10- or 20-ms granularity of the system clock.  (On single-processor
       Windows systems, the usec field is derived from a  performance  counter
       and is highly precise.)

   VIRTUALIZED TIME
       The  Tcl_SetTimeProc  function  registers two related handler functions
       with the core. The first handler function is a replacement for Tcl_Get‐
       Time,  or  rather  the OS access made by Tcl_GetTime. The other handler
       function is used by the Tcl notifier to convert wait/block  times  from
       the virtual domain into real time.

       The Tcl_QueryTimeProc function returns the currently registered handler
       functions. If no external handlers were set then this will  return  the
       standard	 handlers  accessing and processing the native time of the OS.
       The arguments to the function are allowed to be NULL; and any  argument
       which is NULL is ignored and not set.

       The signatures of the handler functions are as follows:

	      typedef void Tcl_GetTimeProc(
		      Tcl_Time *timebuf,
		      ClientData clientData);
	      typedef void Tcl_ScaleTimeProc(
		      Tcl_Time *timebuf,
		      ClientData clientData);

       The  timebuf  fields contain the time to manipulate, and the clientData
       fields contain a pointer supplied at the	 time  the  handler  functions
       were registered.

       Any  handler  pair  specified  has  to  return data which is consistent
       between them. In other words, setting one handler of the pair to	 some‐
       thing  assuming	a 10-times slowdown, and the other handler of the pair
       to something assuming a two-times slowdown is wrong and not allowed.

       The set handler functions are allowed to run the delivered  time	 back‐
       wards,  however	this  should  be  avoided.  We have to allow it as the
       native time can run backwards as the user can fiddle  with  the	system
       time  one  way  or other. Note that the insertion of the hooks will not
       change the behavior of the Tcl core with regard to this situation, i.e.
       the existing behavior is retained.

SEE ALSO
       clock(n)

KEYWORDS
       date, time

Tcl				      8.4			Tcl_GetTime(3)
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