On Fri, 21 Nov 2008 14:45:35 +0200 "Tor Lillqvist" <tml@xxxxxx> wrote: > > The system clock can be altered by a privileged user (for obvious > > reasons - you need to be able to set it to the current time every > > now and then to accommodate clock drift). > > Isn't that handled on modern systems (once the time has been set > roughly correct, typically at boot time, to within a minute, say) by > just speeding up or slowing down the clock, not by stepping it? See > adjtime(). SetSystemTimeAdjustment() seems to be the corresponding > thing on Win32. Yes indeed, I chose a bad example. Unix-like systems however also provide the settimeofday() function (although neither it nor adjtime() appear to be actually required by Posix), and they also provide a 'date' user command which can manipulate the system clock. The way to guard against these is to use a monotonic clock on timed blocking function calls such as timed condition variable waits. Chris _______________________________________________ gtk-list mailing list gtk-list@xxxxxxxxx http://mail.gnome.org/mailman/listinfo/gtk-list
