[prev in list] [next in list] [prev in thread] [next in thread] 

List:       novalug
Subject:    Re: clock shell to run an application a year earlier?
From:       Peter Teuben <teuben () astro ! umd ! edu>
Date:       2000-10-31 22:00:35
[Download RAW message or body]

there is something available publicly. Essentially you can do it yourself
too, by writing a replacement for time(2) [or whichever kernel function
you need], compile it, make it a shared object, and add this file to your
LD_LIBRARY_PATH environment in the shell where your timed application
needs to run. But after I learned about this trick, i later saw it
announced, maybe it was freshmeat or so.

ah, just found it again, it's called "timefake"
	http://www.trier.linux.de/lpac/index.php?show=41

I've attached the one I must have been using long time ago

On Tue, 31 Oct 2000, Jameson C. Burt wrote:

> Occasionally, I want to run an appliation so that it receives clock responses 
> changed to one year earlier.
> However, I would rather the rest of my system worked
> with the correct clock time (ie, I do not want to change the system clock).
> Is there some shell, some intercept, ... with which I might 
> run an application that will receive a different clock setting?
> 
> I wanted to do this a year ago, when setting up some public software
> (StarOffice?) whose full configuration took a few hours,
> only to see the software expire two months later.
> 

["timefake.c" (TEXT/PLAIN)]



#include <sys/types.h>
#include <time.h>


/*  to get the right number, simply get it via the
		date +%s
    command, and/or adjust to what you need. Also handy
    may be the clock command, to write a new system time
    after it has been set with date. However, this can
    upset other things on your machine.
 */

#ifndef faketime
	/* 5 dec 1999, 21:00 -- for mathematica ?? */
	/* 944445600 */
    #define faketime 931482192
	/* 8 July 1999, 21:00 - for IDL ?? */
    	/* 931482192 */
#endif
    time_t time(time_t *loc)
    {
        if (loc) *loc = faketime;
        return faketime;
    }



#if 1

int setitimer(int which, const struct itimerval *value, struct itimerval *ovalue)
{
    printf("Sorry, faking out setitimer for IDL\n");
    return 0;
}

	

#endif

/* 
  solaris:

    cc -G -o libtimefake.so libtimefake.c

  linux, freeBSD:

    cc -shared -o libtimefake.so libtimefake.c
 */



[prev in list] [next in list] [prev in thread] [next in thread]