1 /* timers.c --- detecting when the user is idle, and other timer-related tasks.
2 * xscreensaver, Copyright (c) 1991-1997, 1998
3 * Jamie Zawinski <jwz@jwz.org>
5 * Permission to use, copy, modify, distribute, and sell this software and its
6 * documentation for any purpose is hereby granted without fee, provided that
7 * the above copyright notice appear in all copies and that both that
8 * copyright notice and this permission notice appear in supporting
9 * documentation. No representations are made about the suitability of this
10 * software for any purpose. It is provided "as is" without express or
18 /* #define DEBUG_TIMERS */
22 #include <X11/Intrinsic.h>
26 # include <X11/Xmu/Error.h>
28 # include <Xmu/Error.h>
30 # else /* !HAVE_XMU */
32 #endif /* !HAVE_XMU */
34 #ifdef HAVE_XIDLE_EXTENSION
35 #include <X11/extensions/xidle.h>
36 #endif /* HAVE_XIDLE_EXTENSION */
38 #ifdef HAVE_MIT_SAVER_EXTENSION
39 #include <X11/extensions/scrnsaver.h>
40 #endif /* HAVE_MIT_SAVER_EXTENSION */
42 #ifdef HAVE_SGI_SAVER_EXTENSION
43 #include <X11/extensions/XScreenSaver.h>
44 #endif /* HAVE_SGI_SAVER_EXTENSION */
46 #include "xscreensaver.h"
48 #ifdef HAVE_PROC_INTERRUPTS
49 static Bool proc_interrupts_activity_p (saver_info *si);
50 #endif /* HAVE_PROC_INTERRUPTS */
52 static void check_for_clock_skew (saver_info *si);
56 idle_timer (XtPointer closure, XtIntervalId *id)
58 saver_info *si = (saver_info *) closure;
60 /* What an amazingly shitty design. Not only does Xt execute timeout
61 events from XtAppNextEvent() instead of from XtDispatchEvent(), but
62 there is no way to tell Xt to block until there is an X event OR a
63 timeout happens. Once your timeout proc is called, XtAppNextEvent()
64 still won't return until a "real" X event comes in.
66 So this function pushes a stupid, gratuitous, unnecessary event back
67 on the event queue to force XtAppNextEvent to return Right Fucking Now.
68 When the code in sleep_until_idle() sees an event of type XAnyEvent,
69 which the server never generates, it knows that a timeout has occurred.
72 fake_event.type = 0; /* XAnyEvent type, ignored. */
73 fake_event.xany.display = si->dpy;
74 fake_event.xany.window = 0;
75 XPutBackEvent (si->dpy, &fake_event);
80 schedule_wakeup_event (saver_info *si, Time when, Bool verbose_p)
82 /* Wake up periodically to ask the server if we are idle. */
83 si->timer_id = XtAppAddTimeOut (si->app, when, idle_timer,
88 fprintf (stderr, "%s: starting idle_timer (%ld, %ld)\n",
89 blurb(), when, si->timer_id);
90 #endif /* DEBUG_TIMERS */
95 notice_events (saver_info *si, Window window, Bool top_p)
97 saver_preferences *p = &si->prefs;
98 XWindowAttributes attrs;
100 Window root, parent, *kids;
103 if (XtWindowToWidget (si->dpy, window))
104 /* If it's one of ours, don't mess up its event mask. */
107 if (!XQueryTree (si->dpy, window, &root, &parent, &kids, &nkids))
112 XGetWindowAttributes (si->dpy, window, &attrs);
113 events = ((attrs.all_event_masks | attrs.do_not_propagate_mask)
116 /* Select for SubstructureNotify on all windows.
117 Select for KeyPress on all windows that already have it selected.
119 Note that we can't select for ButtonPress, because of X braindamage:
120 only one client at a time may select for ButtonPress on a given
121 window, though any number can select for KeyPress. Someone explain
124 So, if the user spends a while clicking the mouse without ever moving
125 the mouse or touching the keyboard, we won't know that they've been
126 active, and the screensaver will come on. That sucks, but I don't
127 know how to get around it.
129 XSelectInput (si->dpy, window, SubstructureNotifyMask | events);
131 if (top_p && p->verbose_p && (events & KeyPressMask))
133 /* Only mention one window per tree (hack hack). */
134 fprintf (stderr, "%s: selected KeyPress on 0x%lX\n", blurb(),
135 (unsigned long) window);
142 notice_events (si, kids [--nkids], top_p);
143 XFree ((char *) kids);
149 BadWindow_ehandler (Display *dpy, XErrorEvent *error)
151 /* When we notice a window being created, we spawn a timer that waits
152 30 seconds or so, and then selects events on that window. This error
153 handler is used so that we can cope with the fact that the window
154 may have been destroyed <30 seconds after it was created.
156 if (error->error_code == BadWindow ||
157 error->error_code == BadMatch ||
158 error->error_code == BadDrawable)
161 return saver_ehandler (dpy, error);
165 struct notice_events_timer_arg {
171 notice_events_timer (XtPointer closure, XtIntervalId *id)
173 struct notice_events_timer_arg *arg =
174 (struct notice_events_timer_arg *) closure;
176 XErrorHandler old_handler = XSetErrorHandler (BadWindow_ehandler);
178 saver_info *si = arg->si;
179 Window window = arg->w;
182 notice_events (si, window, True);
183 XSync (si->dpy, False);
184 XSetErrorHandler (old_handler);
188 start_notice_events_timer (saver_info *si, Window w, Bool verbose_p)
190 saver_preferences *p = &si->prefs;
191 struct notice_events_timer_arg *arg =
192 (struct notice_events_timer_arg *) malloc(sizeof(*arg));
195 XtAppAddTimeOut (si->app, p->notice_events_timeout, notice_events_timer,
199 fprintf (stderr, "%s: starting notice_events_timer for 0x%X (%lu)\n",
200 blurb(), (unsigned int) w, p->notice_events_timeout);
204 /* When the screensaver is active, this timer will periodically change
208 cycle_timer (XtPointer closure, XtIntervalId *id)
210 saver_info *si = (saver_info *) closure;
211 saver_preferences *p = &si->prefs;
212 Time how_long = p->cycle;
214 if (si->selection_mode > 0 &&
215 screenhack_running_p (si))
216 /* If we're in "SELECT n" mode, the cycle timer going off will just
217 restart this same hack again. There's not much point in doing this
218 every 5 or 10 minutes, but on the other hand, leaving one hack running
219 for days is probably not a great idea, since they tend to leak and/or
220 crash. So, restart the thing once an hour. */
221 how_long = 1000 * 60 * 60;
226 fprintf (stderr, "%s: dialog box up; delaying hack change.\n",
228 how_long = 30000; /* 30 secs */
232 maybe_reload_init_file (si);
233 kill_screenhack (si);
235 if (!si->throttled_p)
236 spawn_screenhack (si, False);
239 raise_window (si, True, True, False);
241 fprintf (stderr, "%s: not launching new hack (throttled.)\n",
246 si->cycle_id = XtAppAddTimeOut (si->app, how_long, cycle_timer,
251 fprintf (stderr, "%s: starting cycle_timer (%ld, %ld)\n",
252 blurb(), how_long, si->cycle_id);
253 #endif /* DEBUG_TIMERS */
258 activate_lock_timer (XtPointer closure, XtIntervalId *id)
260 saver_info *si = (saver_info *) closure;
261 saver_preferences *p = &si->prefs;
264 fprintf (stderr, "%s: timed out; activating lock.\n", blurb());
265 set_locked_p (si, True);
269 /* Call this when user activity (or "simulated" activity) has been noticed.
272 reset_timers (saver_info *si)
274 saver_preferences *p = &si->prefs;
275 if (si->using_mit_saver_extension || si->using_sgi_saver_extension)
282 fprintf (stderr, "%s: killing idle_timer (%ld, %ld)\n",
283 blurb(), p->timeout, si->timer_id);
284 #endif /* DEBUG_TIMERS */
285 XtRemoveTimeOut (si->timer_id);
288 schedule_wakeup_event (si, p->timeout, p->verbose_p); /* sets si->timer_id */
290 if (si->cycle_id) abort (); /* no cycle timer when inactive */
292 si->last_activity_time = time ((time_t *) 0);
296 /* When we aren't using a server extension, this timer is used to periodically
297 wake up and poll the mouse position, which is possibly more reliable than
298 selecting motion events on every window.
301 check_pointer_timer (XtPointer closure, XtIntervalId *id)
304 saver_info *si = (saver_info *) closure;
305 saver_preferences *p = &si->prefs;
306 Bool active_p = False;
308 if (!si->using_proc_interrupts &&
309 (si->using_xidle_extension ||
310 si->using_mit_saver_extension ||
311 si->using_sgi_saver_extension))
312 /* If an extension is in use, we should not be polling the mouse.
313 Unless we're also checking /proc/interrupts, in which case, we should.
317 si->check_pointer_timer_id =
318 XtAppAddTimeOut (si->app, p->pointer_timeout, check_pointer_timer,
321 for (i = 0; i < si->nscreens; i++)
323 saver_screen_info *ssi = &si->screens[i];
325 int root_x, root_y, x, y;
328 XQueryPointer (si->dpy, ssi->screensaver_window, &root, &child,
329 &root_x, &root_y, &x, &y, &mask);
331 if (root_x == ssi->poll_mouse_last_root_x &&
332 root_y == ssi->poll_mouse_last_root_y &&
333 child == ssi->poll_mouse_last_child &&
334 mask == ssi->poll_mouse_last_mask)
341 if (root_x == ssi->poll_mouse_last_root_x &&
342 root_y == ssi->poll_mouse_last_root_y &&
343 child == ssi->poll_mouse_last_child)
344 fprintf (stderr, "%s: modifiers changed at %s on screen %d.\n",
345 blurb(), timestring(), i);
347 fprintf (stderr, "%s: pointer moved at %s on screen %d.\n",
348 blurb(), timestring(), i);
351 fprintf (stderr, "%s: old: %d %d 0x%x ; new: %d %d 0x%x\n",
353 ssi->poll_mouse_last_root_x,
354 ssi->poll_mouse_last_root_y,
355 (unsigned int) ssi->poll_mouse_last_child,
356 root_x, root_y, (unsigned int) child);
359 #endif /* DEBUG_TIMERS */
361 si->last_activity_screen = ssi;
362 ssi->poll_mouse_last_root_x = root_x;
363 ssi->poll_mouse_last_root_y = root_y;
364 ssi->poll_mouse_last_child = child;
365 ssi->poll_mouse_last_mask = mask;
368 #ifdef HAVE_PROC_INTERRUPTS
370 si->using_proc_interrupts &&
371 proc_interrupts_activity_p (si))
375 fprintf (stderr, "%s: /proc/interrupts activity at %s.\n",
376 blurb(), timestring());
377 # endif /* DEBUG_TIMERS */
380 #endif /* HAVE_PROC_INTERRUPTS */
386 check_for_clock_skew (si);
390 /* An unfortunate situation is this: the saver is not active, because the
391 user has been typing. The machine is a laptop. The user closes the lid
392 and suspends it. The CPU halts. Some hours later, the user opens the
393 lid. At this point, Xt's timers will fire, and xscreensaver will blank
396 So far so good -- well, not really, but it's the best that we can do,
397 since the OS doesn't send us a signal *before* shutdown -- but if the
398 user had delayed locking (lockTimeout > 0) then we should start off
399 in the locked state, rather than only locking N minutes from when the
400 lid was opened. Also, eschewing fading is probably a good idea, to
401 clamp down as soon as possible.
403 We only do this when we'd be polling the mouse position anyway.
404 This amounts to an assumption that machines with APM support also
405 have /proc/interrupts.
408 check_for_clock_skew (saver_info *si)
410 saver_preferences *p = &si->prefs;
411 time_t now = time ((time_t *) 0);
412 long shift = now - si->last_wall_clock_time;
416 fprintf (stderr, "%s: checking wall clock (%d).\n", blurb(),
417 (si->last_wall_clock_time == 0 ? 0 : shift));
418 #endif /* DEBUG_TIMERS */
420 if (si->last_wall_clock_time != 0 &&
421 shift > (p->timeout / 1000))
424 fprintf (stderr, "%s: wall clock has jumped by %d:%02d:%02d!\n",
426 (shift / (60 * 60)), ((shift / 60) % 60), (shift % 60));
428 si->emergency_lock_p = True;
429 idle_timer ((XtPointer) si, 0);
432 si->last_wall_clock_time = now;
438 dispatch_event (saver_info *si, XEvent *event)
440 /* If this is for the splash dialog, pass it along.
441 Note that the password dialog is handled with its own event loop,
442 so events for that window will never come through here.
444 if (si->splash_dialog && event->xany.window == si->splash_dialog)
445 handle_splash_event (si, event);
447 XtDispatchEvent (event);
452 swallow_unlock_typeahead_events (saver_info *si, XEvent *e)
458 memset (buf, 0, sizeof(buf));
464 if (event.xany.type == KeyPress)
467 int size = XLookupString ((XKeyEvent *) &event, s, 1, 0, 0);
468 if (size != 1) continue;
471 case '\010': case '\177': /* Backspace */
474 case '\025': case '\030': /* Erase line */
475 case '\012': case '\015': /* Enter */
478 case '\040': /* Space */
480 break; /* ignore space at beginning of line */
481 /* else, fall through */
488 } while (i < sizeof(buf)-1 &&
489 XCheckMaskEvent (si->dpy, KeyPressMask, &event));
493 if (si->unlock_typeahead)
495 memset (si->unlock_typeahead, 0, strlen(si->unlock_typeahead));
496 free (si->unlock_typeahead);
500 si->unlock_typeahead = strdup (buf);
502 si->unlock_typeahead = 0;
504 memset (buf, 0, sizeof(buf));
508 /* methods of detecting idleness:
510 explicitly informed by SGI SCREEN_SAVER server event;
511 explicitly informed by MIT-SCREEN-SAVER server event;
512 poll server idle time with XIDLE extension;
513 select events on all windows, and note absence of recent events;
514 note that /proc/interrupts has not changed in a while;
515 activated by clientmessage.
517 methods of detecting non-idleness:
519 read events on the xscreensaver window;
520 explicitly informed by SGI SCREEN_SAVER server event;
521 explicitly informed by MIT-SCREEN-SAVER server event;
522 select events on all windows, and note events on any of them;
523 note that /proc/interrupts has changed;
524 deactivated by clientmessage.
526 I trust that explains why this function is a big hairy mess.
529 sleep_until_idle (saver_info *si, Bool until_idle_p)
531 saver_preferences *p = &si->prefs;
534 /* We need to select events on all windows if we're not using any extensions.
535 Otherwise, we don't need to. */
536 Bool scanning_all_windows = !(si->using_xidle_extension ||
537 si->using_mit_saver_extension ||
538 si->using_sgi_saver_extension);
540 /* We need to periodically wake up and check for idleness if we're not using
541 any extensions, or if we're using the XIDLE extension. The other two
542 extensions explicitly deliver events when we go idle/non-idle, so we
543 don't need to poll. */
544 Bool polling_for_idleness = !(si->using_mit_saver_extension ||
545 si->using_sgi_saver_extension);
547 /* Whether we need to periodically wake up and check to see if the mouse has
548 moved. We only need to do this when not using any extensions. The reason
549 this isn't the same as `polling_for_idleness' is that the "idleness" poll
550 can happen (for example) 5 minutes from now, whereas the mouse-position
551 poll should happen with low periodicity. We don't need to poll the mouse
552 position with the XIDLE extension, but we do need to periodically wake up
553 and query the server with that extension. For our purposes, polling
554 /proc/interrupts is just like polling the mouse position. It has to
555 happen on the same kind of schedule. */
556 Bool polling_mouse_position = (si->using_proc_interrupts ||
557 !(si->using_xidle_extension ||
558 si->using_mit_saver_extension ||
559 si->using_sgi_saver_extension));
563 if (polling_for_idleness)
564 /* This causes a no-op event to be delivered to us in a while, so that
565 we come back around through the event loop again. Use of this timer
566 is economical: for example, if the screensaver should come on in 5
567 minutes, and the user has been idle for 2 minutes, then this
568 timeout will go off no sooner than 3 minutes from now. */
569 schedule_wakeup_event (si, p->timeout, p->verbose_p);
571 if (polling_mouse_position)
572 /* Check to see if the mouse has moved, and set up a repeating timer
573 to do so periodically (typically, every 5 seconds.) */
574 check_pointer_timer ((XtPointer) si, 0);
579 XtAppNextEvent (si->app, &event);
581 switch (event.xany.type) {
582 case 0: /* our synthetic "timeout" event has been signalled */
586 #ifdef HAVE_XIDLE_EXTENSION
587 if (si->using_xidle_extension)
589 /* The XIDLE extension uses the synthetic event to prod us into
590 re-asking the server how long the user has been idle. */
591 if (! XGetIdleTime (si->dpy, &idle))
593 fprintf (stderr, "%s: XGetIdleTime() failed.\n", blurb());
594 saver_exit (si, 1, 0);
598 #endif /* HAVE_XIDLE_EXTENSION */
599 #ifdef HAVE_MIT_SAVER_EXTENSION
600 if (si->using_mit_saver_extension)
602 /* We don't need to do anything in this case - the synthetic
603 event isn't necessary, as we get sent specific events
604 to wake us up. In fact, this event generally shouldn't
605 be being delivered when the MIT extension is in use. */
609 #endif /* HAVE_MIT_SAVER_EXTENSION */
610 #ifdef HAVE_SGI_SAVER_EXTENSION
611 if (si->using_sgi_saver_extension)
613 /* We don't need to do anything in this case - the synthetic
614 event isn't necessary, as we get sent specific events
615 to wake us up. In fact, this event generally shouldn't
616 be being delivered when the SGI extension is in use. */
620 #endif /* HAVE_SGI_SAVER_EXTENSION */
622 /* Otherwise, no server extension is in use. The synthetic
623 event was to tell us to wake up and see if the user is now
624 idle. Compute the amount of idle time by comparing the
625 `last_activity_time' to the wall clock. The l_a_t was set
626 by calling `reset_timers()', which is called only in only
627 two situations: when polling the mouse position has revealed
628 the the mouse has moved (user activity) or when we have read
629 an event (again, user activity.)
631 idle = 1000 * (si->last_activity_time - time ((time_t *) 0));
634 if (idle >= p->timeout)
636 /* Look, we've been idle long enough. We're done. */
639 else if (si->emergency_lock_p)
641 /* Oops, the wall clock has jumped far into the future, so
642 we need to lock down in a hurry! */
647 /* The event went off, but it turns out that the user has not
648 yet been idle for long enough. So re-signal the event.
650 if (polling_for_idleness)
651 schedule_wakeup_event (si, p->timeout - idle, p->verbose_p);
657 if (handle_clientmessage (si, &event, until_idle_p))
662 /* A window has been created on the screen somewhere. If we're
663 supposed to scan all windows for events, prepare this window. */
664 if (scanning_all_windows)
666 Window w = event.xcreatewindow.window;
668 start_notice_events_timer (si, w, p->verbose_p);
669 #else /* !DEBUG_TIMERS */
670 start_notice_events_timer (si, w, False);
671 #endif /* !DEBUG_TIMERS */
684 if (event.xany.type == MotionNotify)
685 fprintf (stderr,"%s: MotionNotify at %s\n",blurb(),timestring());
686 else if (event.xany.type == KeyPress)
687 fprintf (stderr, "%s: KeyPress seen on 0x%X at %s\n", blurb(),
688 (unsigned int) event.xkey.window, timestring ());
689 else if (event.xany.type == ButtonPress)
690 fprintf (stderr, "%s: ButtonPress seen on 0x%X at %s\n", blurb(),
691 (unsigned int) event.xbutton.window, timestring ());
693 #endif /* DEBUG_TIMERS */
695 /* If any widgets want to handle this event, let them. */
696 dispatch_event (si, &event);
698 /* We got a user event.
699 If we're waiting for the user to become active, this is it.
700 If we're waiting until the user becomes idle, reset the timers
701 (since now we have longer to wait.)
706 (event.xany.type == MotionNotify ||
707 event.xany.type == KeyRelease))
708 /* When we're demoing a single hack, mouse motion doesn't
709 cause deactivation. Only clicks and keypresses do. */
712 /* If we're not demoing, then any activity causes deactivation.
723 #ifdef HAVE_MIT_SAVER_EXTENSION
724 if (event.type == si->mit_saver_ext_event_number)
726 /* This event's number is that of the MIT-SCREEN-SAVER server
727 extension. This extension has one event number, and the event
728 itself contains sub-codes that say what kind of event it was
729 (an "idle" or "not-idle" event.)
731 XScreenSaverNotifyEvent *sevent =
732 (XScreenSaverNotifyEvent *) &event;
733 if (sevent->state == ScreenSaverOn)
737 fprintf (stderr, "%s: MIT ScreenSaverOn event received.\n",
740 /* Get the "real" server window(s) out of the way as soon
742 for (i = 0; i < si->nscreens; i++)
744 saver_screen_info *ssi = &si->screens[i];
745 if (ssi->server_mit_saver_window &&
746 window_exists_p (si->dpy,
747 ssi->server_mit_saver_window))
748 XUnmapWindow (si->dpy, ssi->server_mit_saver_window);
751 if (sevent->kind != ScreenSaverExternal)
754 "%s: ScreenSaverOn event wasn't of type External!\n",
761 else if (sevent->state == ScreenSaverOff)
764 fprintf (stderr, "%s: MIT ScreenSaverOff event received.\n",
771 "%s: unknown MIT-SCREEN-SAVER event %d received!\n",
772 blurb(), sevent->state);
776 #endif /* HAVE_MIT_SAVER_EXTENSION */
779 #ifdef HAVE_SGI_SAVER_EXTENSION
780 if (event.type == (si->sgi_saver_ext_event_number + ScreenSaverStart))
782 /* The SGI SCREEN_SAVER server extension has two event numbers,
783 and this event matches the "idle" event. */
785 fprintf (stderr, "%s: SGI ScreenSaverStart event received.\n",
791 else if (event.type == (si->sgi_saver_ext_event_number +
794 /* The SGI SCREEN_SAVER server extension has two event numbers,
795 and this event matches the "idle" event. */
797 fprintf (stderr, "%s: SGI ScreenSaverEnd event received.\n",
803 #endif /* HAVE_SGI_SAVER_EXTENSION */
805 /* Just some random event. Let the Widgets handle it, if desired. */
806 dispatch_event (si, &event);
812 /* If there's a user event on the queue, swallow it.
813 If we're using a server extension, and the user becomes active, we
814 get the extension event before the user event -- so the keypress or
815 motion or whatever is still on the queue. This makes "unfade" not
816 work, because it sees that event, and bugs out. (This problem
817 doesn't exhibit itself without an extension, because in that case,
818 there's only one event generated by user activity, not two.)
820 if (!until_idle_p && si->locked_p)
821 swallow_unlock_typeahead_events (si, &event);
823 while (XCheckMaskEvent (si->dpy,
824 (KeyPressMask|ButtonPressMask|PointerMotionMask),
829 if (si->check_pointer_timer_id)
831 XtRemoveTimeOut (si->check_pointer_timer_id);
832 si->check_pointer_timer_id = 0;
836 XtRemoveTimeOut (si->timer_id);
840 if (until_idle_p && si->cycle_id) /* no cycle timer when inactive */
848 /* Some crap for dealing with /proc/interrupts.
850 On Linux systems, it's possible to see the hardware interrupt count
851 associated with the keyboard. We can therefore use that as another method
852 of detecting idleness.
854 Why is it a good idea to do this? Because it lets us detect keyboard
855 activity that is not associated with X events. For example, if the user
856 has switched to another virtual console, it's good for xscreensaver to not
857 be running graphics hacks on the (non-visible) X display. The common
858 complaint that checking /proc/interrupts addresses is that the user is
859 playing Quake on a non-X console, and the GL hacks are perceptibly slowing
862 This is tricky for a number of reasons.
864 * First, we must be sure to only do this when running on an X server that
865 is on the local machine (because otherwise, we'd be reacting to the
866 wrong keyboard.) The way we do this is by noting that the $DISPLAY is
867 pointing to display 0 on the local machine. It *could* be that display
868 1 is also on the local machine (e.g., two X servers, each on a different
869 virtual-terminal) but it's also possible that screen 1 is an X terminal,
870 using this machine as the host. So we can't take that chance.
872 * Second, one can only access these interrupt numbers in a completely
873 and utterly brain-damaged way. You would think that one would use an
874 ioctl for this. But no. The ONLY way to get this information is to
875 open the pseudo-file /proc/interrupts AS A FILE, and read the numbers
876 out of it TEXTUALLY. Because this is Unix, and all the world's a file,
877 and the only real data type is the short-line sequence of ASCII bytes.
879 Now it's all well and good that the /proc/interrupts pseudo-file
880 exists; that's a clever idea, and a useful API for things that are
881 already textually oriented, like shell scripts, and users doing
882 interactive debugging sessions. But to make a *C PROGRAM* open a file
883 and parse the textual representation of integers out of it is just
886 * Third, you can't just hold the file open, and fseek() back to the
887 beginning to get updated data! If you do that, the data never changes.
888 And I don't want to call open() every five seconds, because I don't want
889 to risk going to disk for any inodes. It turns out that if you dup()
890 it early, then each copy gets fresh data, so we can get around that in
891 this way (but for how many releases, one might wonder?)
893 * Fourth, the format of the output of the /proc/interrupts file is
894 undocumented, and has changed several times already! In Linux 2.0.33,
895 even on a multiprocessor machine, it looks like this:
900 but on later kernels with MP machines, it looks like this:
903 0: 1671450 1672618 IO-APIC-edge timer
904 1: 13037 13495 IO-APIC-edge keyboard
906 Joy! So how are we expected to parse that? Well, this code doesn't
907 parse it: it saves the last line with the string "keyboard" in it, and
908 does a string-comparison to note when it has changed.
910 Thanks to Nat Friedman <nat@nat.org> for figuring out all of this crap.
912 Note that this only checks for lines with "keyboard" or "PS/2 Mouse" in
913 them. If you have a serial mouse, it won't detect that, it will only detect
914 keyboard activity. That's because there's no way to tell the difference
915 between a serial mouse and a general serial port, and it would be somewhat
916 unfortunate to have the screensaver turn off when the modem on COM1 burped.
920 #ifdef HAVE_PROC_INTERRUPTS
922 #define PROC_INTERRUPTS "/proc/interrupts"
925 query_proc_interrupts_available (saver_info *si, const char **why)
927 /* We can use /proc/interrupts if $DISPLAY points to :0, and if the
928 "/proc/interrupts" file exists and is readable.
933 if (!display_is_on_console_p (si))
935 if (why) *why = "not on primary console";
939 f = fopen (PROC_INTERRUPTS, "r");
949 proc_interrupts_activity_p (saver_info *si)
954 static char last_kbd_line[255] = { 0, };
955 static char last_ptr_line[255] = { 0, };
956 char new_line[sizeof(last_kbd_line)];
957 Bool got_kbd = False, kbd_diff = False;
958 Bool got_ptr = False, ptr_diff = False;
962 /* First time -- open the file. */
963 f0 = fopen (PROC_INTERRUPTS, "r");
967 sprintf(buf, "%s: error opening %s", blurb(), PROC_INTERRUPTS);
973 if (f0 == (FILE *) -1) /* means we got an error initializing. */
976 fd = dup (fileno (f0));
980 sprintf(buf, "%s: could not dup() the %s fd", blurb(), PROC_INTERRUPTS);
985 f1 = fdopen (fd, "r");
989 sprintf(buf, "%s: could not fdopen() the %s fd", blurb(),
995 /* Actually, I'm unclear on why this fseek() is necessary, given the timing
996 of the dup() above, but it is. */
997 if (fseek (f1, 0, SEEK_SET) != 0)
1000 sprintf(buf, "%s: error rewinding %s", blurb(), PROC_INTERRUPTS);
1005 /* Now read through the pseudo-file until we find the "keyboard" line. */
1007 while (fgets (new_line, sizeof(new_line)-1, f1))
1009 if (!got_kbd && strstr (new_line, "keyboard"))
1011 kbd_diff = (*last_kbd_line && !!strcmp (new_line, last_kbd_line));
1012 strcpy (last_kbd_line, new_line);
1015 else if (!got_ptr && strstr (new_line, "PS/2 Mouse"))
1017 ptr_diff = (*last_ptr_line && !!strcmp (new_line, last_ptr_line));
1018 strcpy (last_ptr_line, new_line);
1022 if (got_kbd && got_ptr)
1026 if (got_kbd || got_ptr)
1029 return (kbd_diff || ptr_diff);
1033 /* If we got here, we didn't find either a "keyboard" or a "PS/2 Mouse"
1034 line in the file at all. */
1035 fprintf (stderr, "%s: no keyboard or mouse data in %s?\n",
1036 blurb(), PROC_INTERRUPTS);
1042 if (f0 && f0 != (FILE *) -1)
1049 #endif /* HAVE_PROC_INTERRUPTS */
1052 /* This timer goes off every few minutes, whether the user is idle or not,
1053 to try and clean up anything that has gone wrong.
1055 It calls disable_builtin_screensaver() so that if xset has been used,
1056 or some other program (like xlock) has messed with the XSetScreenSaver()
1057 settings, they will be set back to sensible values (if a server extension
1058 is in use, messing with xlock can cause xscreensaver to never get a wakeup
1059 event, and could cause monitor power-saving to occur, and all manner of
1062 If the screen is currently blanked, it raises the window, in case some
1063 other window has been mapped on top of it.
1065 If the screen is currently blanked, and there is no hack running, it
1066 clears the window, in case there is an error message printed on it (we
1067 don't want the error message to burn in.)
1071 watchdog_timer (XtPointer closure, XtIntervalId *id)
1073 saver_info *si = (saver_info *) closure;
1074 saver_preferences *p = &si->prefs;
1076 disable_builtin_screensaver (si, False);
1078 /* If the DPMS settings on the server have changed, change them back to
1079 what ~/.xscreensaver says they should be. */
1080 sync_server_dpms_settings (si->dpy, p->dpms_enabled_p,
1081 p->dpms_standby / 1000,
1082 p->dpms_suspend / 1000,
1086 if (si->screen_blanked_p)
1088 Bool running_p = screenhack_running_p (si);
1093 if (si->prefs.verbose_p)
1094 fprintf (stderr, "%s: dialog box is up: not raising screen.\n",
1096 #endif /* DEBUG_TIMERS */
1101 if (si->prefs.verbose_p)
1102 fprintf (stderr, "%s: watchdog timer raising %sscreen.\n",
1103 blurb(), (running_p ? "" : "and clearing "));
1104 #endif /* DEBUG_TIMERS */
1106 raise_window (si, True, True, running_p);
1109 if (screenhack_running_p (si) &&
1110 !monitor_powered_on_p (si))
1112 if (si->prefs.verbose_p)
1114 "%s: X says monitor has powered down; "
1115 "killing running hacks.\n", blurb());
1116 kill_screenhack (si);
1119 /* Re-schedule this timer. The watchdog timer defaults to a bit less
1120 than the hack cycle period, but is never longer than one hour.
1122 si->watchdog_id = 0;
1123 reset_watchdog_timer (si, True);
1129 reset_watchdog_timer (saver_info *si, Bool on_p)
1131 saver_preferences *p = &si->prefs;
1133 if (si->watchdog_id)
1135 XtRemoveTimeOut (si->watchdog_id);
1136 si->watchdog_id = 0;
1139 if (on_p && p->watchdog_timeout)
1141 si->watchdog_id = XtAppAddTimeOut (si->app, p->watchdog_timeout,
1142 watchdog_timer, (XtPointer) si);
1146 fprintf (stderr, "%s: restarting watchdog_timer (%ld, %ld)\n",
1147 blurb(), p->watchdog_timeout, si->watchdog_id);
1148 #endif /* DEBUG_TIMERS */