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);
234 fprintf (stderr, "%s: changing graphics hacks.\n", blurb());
235 kill_screenhack (si);
237 if (!si->throttled_p)
238 spawn_screenhack (si, False);
241 raise_window (si, True, True, False);
243 fprintf (stderr, "%s: not launching new hack (throttled.)\n",
248 si->cycle_id = XtAppAddTimeOut (si->app, how_long, cycle_timer,
253 fprintf (stderr, "%s: starting cycle_timer (%ld, %ld)\n",
254 blurb(), how_long, si->cycle_id);
255 #endif /* DEBUG_TIMERS */
260 activate_lock_timer (XtPointer closure, XtIntervalId *id)
262 saver_info *si = (saver_info *) closure;
263 saver_preferences *p = &si->prefs;
266 fprintf (stderr, "%s: timed out; activating lock.\n", blurb());
267 set_locked_p (si, True);
271 /* Call this when user activity (or "simulated" activity) has been noticed.
274 reset_timers (saver_info *si)
276 saver_preferences *p = &si->prefs;
277 if (si->using_mit_saver_extension || si->using_sgi_saver_extension)
284 fprintf (stderr, "%s: killing idle_timer (%ld, %ld)\n",
285 blurb(), p->timeout, si->timer_id);
286 #endif /* DEBUG_TIMERS */
287 XtRemoveTimeOut (si->timer_id);
290 schedule_wakeup_event (si, p->timeout, p->verbose_p); /* sets si->timer_id */
292 if (si->cycle_id) abort (); /* no cycle timer when inactive */
294 si->last_activity_time = time ((time_t *) 0);
298 /* When we aren't using a server extension, this timer is used to periodically
299 wake up and poll the mouse position, which is possibly more reliable than
300 selecting motion events on every window.
303 check_pointer_timer (XtPointer closure, XtIntervalId *id)
306 saver_info *si = (saver_info *) closure;
307 saver_preferences *p = &si->prefs;
308 Bool active_p = False;
310 if (!si->using_proc_interrupts &&
311 (si->using_xidle_extension ||
312 si->using_mit_saver_extension ||
313 si->using_sgi_saver_extension))
314 /* If an extension is in use, we should not be polling the mouse.
315 Unless we're also checking /proc/interrupts, in which case, we should.
319 si->check_pointer_timer_id =
320 XtAppAddTimeOut (si->app, p->pointer_timeout, check_pointer_timer,
323 for (i = 0; i < si->nscreens; i++)
325 saver_screen_info *ssi = &si->screens[i];
327 int root_x, root_y, x, y;
330 XQueryPointer (si->dpy, ssi->screensaver_window, &root, &child,
331 &root_x, &root_y, &x, &y, &mask);
333 if (root_x == ssi->poll_mouse_last_root_x &&
334 root_y == ssi->poll_mouse_last_root_y &&
335 child == ssi->poll_mouse_last_child &&
336 mask == ssi->poll_mouse_last_mask)
343 if (root_x == ssi->poll_mouse_last_root_x &&
344 root_y == ssi->poll_mouse_last_root_y &&
345 child == ssi->poll_mouse_last_child)
346 fprintf (stderr, "%s: modifiers changed at %s on screen %d.\n",
347 blurb(), timestring(), i);
349 fprintf (stderr, "%s: pointer moved at %s on screen %d.\n",
350 blurb(), timestring(), i);
351 #endif /* DEBUG_TIMERS */
353 si->last_activity_screen = ssi;
354 ssi->poll_mouse_last_root_x = root_x;
355 ssi->poll_mouse_last_root_y = root_y;
356 ssi->poll_mouse_last_child = child;
357 ssi->poll_mouse_last_mask = mask;
360 #ifdef HAVE_PROC_INTERRUPTS
362 si->using_proc_interrupts &&
363 proc_interrupts_activity_p (si))
367 fprintf (stderr, "%s: /proc/interrupts activity at %s.\n",
368 blurb(), timestring());
369 # endif /* DEBUG_TIMERS */
372 #endif /* HAVE_PROC_INTERRUPTS */
378 check_for_clock_skew (si);
382 /* An unfortunate situation is this: the saver is not active, because the
383 user has been typing. The machine is a laptop. The user closes the lid
384 and suspends it. The CPU halts. Some hours later, the user opens the
385 lid. At this point, Xt's timers will fire, and xscreensaver will blank
388 So far so good -- well, not really, but it's the best that we can do,
389 since the OS doesn't send us a signal *before* shutdown -- but if the
390 user had delayed locking (lockTimeout > 0) then we should start off
391 in the locked state, rather than only locking N minutes from when the
392 lid was opened. Also, eschewing fading is probably a good idea, to
393 clamp down as soon as possible.
395 We only do this when we'd be polling the mouse position anyway.
396 This amounts to an assumption that machines with APM support also
397 have /proc/interrupts.
400 check_for_clock_skew (saver_info *si)
402 saver_preferences *p = &si->prefs;
403 time_t now = time ((time_t *) 0);
404 long shift = now - si->last_wall_clock_time;
408 fprintf (stderr, "%s: checking wall clock (%d).\n", blurb(),
409 (si->last_wall_clock_time == 0 ? 0 : shift));
410 #endif /* DEBUG_TIMERS */
412 if (si->last_wall_clock_time != 0 &&
413 shift > (p->timeout / 1000))
416 fprintf (stderr, "%s: wall clock has jumped by %d:%02d:%02d!\n",
418 (shift / (60 * 60)), ((shift / 60) % 60), (shift % 60));
420 si->emergency_lock_p = True;
421 idle_timer ((XtPointer) si, 0);
424 si->last_wall_clock_time = now;
430 dispatch_event (saver_info *si, XEvent *event)
432 /* If this is for the splash dialog, pass it along.
433 Note that the password dialog is handled with its own event loop,
434 so events for that window will never come through here.
436 if (si->splash_dialog && event->xany.window == si->splash_dialog)
437 handle_splash_event (si, event);
439 XtDispatchEvent (event);
444 swallow_unlock_typeahead_events (saver_info *si, XEvent *e)
450 memset (buf, 0, sizeof(buf));
456 if (event.xany.type == KeyPress)
459 int size = XLookupString (&event, s, 1, 0, 0);
460 if (size != 1) continue;
463 case '\010': case '\177': /* Backspace */
466 case '\025': case '\030': /* Erase line */
467 case '\012': case '\015': /* Enter */
470 case '\040': /* Space */
472 break; /* ignore space at beginning of line */
473 /* else, fall through */
480 } while (i < sizeof(buf)-1 &&
481 XCheckMaskEvent (si->dpy, KeyPressMask, &event));
485 if (si->unlock_typeahead)
487 memset (si->unlock_typeahead, 0, strlen(si->unlock_typeahead));
488 free (si->unlock_typeahead);
492 si->unlock_typeahead = strdup (buf);
494 si->unlock_typeahead = 0;
496 memset (buf, 0, sizeof(buf));
500 /* methods of detecting idleness:
502 explicitly informed by SGI SCREEN_SAVER server event;
503 explicitly informed by MIT-SCREEN-SAVER server event;
504 poll server idle time with XIDLE extension;
505 select events on all windows, and note absence of recent events;
506 note that /proc/interrupts has not changed in a while;
507 activated by clientmessage.
509 methods of detecting non-idleness:
511 read events on the xscreensaver window;
512 explicitly informed by SGI SCREEN_SAVER server event;
513 explicitly informed by MIT-SCREEN-SAVER server event;
514 select events on all windows, and note events on any of them;
515 note that /proc/interrupts has changed;
516 deactivated by clientmessage.
518 I trust that explains why this function is a big hairy mess.
521 sleep_until_idle (saver_info *si, Bool until_idle_p)
523 saver_preferences *p = &si->prefs;
526 /* We need to select events on all windows if we're not using any extensions.
527 Otherwise, we don't need to. */
528 Bool scanning_all_windows = !(si->using_xidle_extension ||
529 si->using_mit_saver_extension ||
530 si->using_sgi_saver_extension);
532 /* We need to periodically wake up and check for idleness if we're not using
533 any extensions, or if we're using the XIDLE extension. The other two
534 extensions explicitly deliver events when we go idle/non-idle, so we
535 don't need to poll. */
536 Bool polling_for_idleness = !(si->using_mit_saver_extension ||
537 si->using_sgi_saver_extension);
539 /* Whether we need to periodically wake up and check to see if the mouse has
540 moved. We only need to do this when not using any extensions. The reason
541 this isn't the same as `polling_for_idleness' is that the "idleness" poll
542 can happen (for example) 5 minutes from now, whereas the mouse-position
543 poll should happen with low periodicity. We don't need to poll the mouse
544 position with the XIDLE extension, but we do need to periodically wake up
545 and query the server with that extension. For our purposes, polling
546 /proc/interrupts is just like polling the mouse position. It has to
547 happen on the same kind of schedule. */
548 Bool polling_mouse_position = (si->using_proc_interrupts ||
549 !(si->using_xidle_extension ||
550 si->using_mit_saver_extension ||
551 si->using_sgi_saver_extension));
555 if (polling_for_idleness)
556 /* This causes a no-op event to be delivered to us in a while, so that
557 we come back around through the event loop again. Use of this timer
558 is economical: for example, if the screensaver should come on in 5
559 minutes, and the user has been idle for 2 minutes, then this
560 timeout will go off no sooner than 3 minutes from now. */
561 schedule_wakeup_event (si, p->timeout, p->verbose_p);
563 if (polling_mouse_position)
564 /* Check to see if the mouse has moved, and set up a repeating timer
565 to do so periodically (typically, every 5 seconds.) */
566 check_pointer_timer ((XtPointer) si, 0);
571 XtAppNextEvent (si->app, &event);
573 switch (event.xany.type) {
574 case 0: /* our synthetic "timeout" event has been signalled */
578 #ifdef HAVE_XIDLE_EXTENSION
579 if (si->using_xidle_extension)
581 /* The XIDLE extension uses the synthetic event to prod us into
582 re-asking the server how long the user has been idle. */
583 if (! XGetIdleTime (si->dpy, &idle))
585 fprintf (stderr, "%s: XGetIdleTime() failed.\n", blurb());
586 saver_exit (si, 1, 0);
590 #endif /* HAVE_XIDLE_EXTENSION */
591 #ifdef HAVE_MIT_SAVER_EXTENSION
592 if (si->using_mit_saver_extension)
594 /* We don't need to do anything in this case - the synthetic
595 event isn't necessary, as we get sent specific events
596 to wake us up. In fact, this event generally shouldn't
597 be being delivered when the MIT extension is in use. */
601 #endif /* HAVE_MIT_SAVER_EXTENSION */
602 #ifdef HAVE_SGI_SAVER_EXTENSION
603 if (si->using_sgi_saver_extension)
605 /* We don't need to do anything in this case - the synthetic
606 event isn't necessary, as we get sent specific events
607 to wake us up. In fact, this event generally shouldn't
608 be being delivered when the SGI extension is in use. */
612 #endif /* HAVE_SGI_SAVER_EXTENSION */
614 /* Otherwise, no server extension is in use. The synthetic
615 event was to tell us to wake up and see if the user is now
616 idle. Compute the amount of idle time by comparing the
617 `last_activity_time' to the wall clock. The l_a_t was set
618 by calling `reset_timers()', which is called only in only
619 two situations: when polling the mouse position has revealed
620 the the mouse has moved (user activity) or when we have read
621 an event (again, user activity.)
623 idle = 1000 * (si->last_activity_time - time ((time_t *) 0));
626 if (idle >= p->timeout)
628 /* Look, we've been idle long enough. We're done. */
631 else if (si->emergency_lock_p)
633 /* Oops, the wall clock has jumped far into the future, so
634 we need to lock down in a hurry! */
639 /* The event went off, but it turns out that the user has not
640 yet been idle for long enough. So re-signal the event.
642 if (polling_for_idleness)
643 schedule_wakeup_event (si, p->timeout - idle, p->verbose_p);
649 if (handle_clientmessage (si, &event, until_idle_p))
654 /* A window has been created on the screen somewhere. If we're
655 supposed to scan all windows for events, prepare this window. */
656 if (scanning_all_windows)
658 Window w = event.xcreatewindow.window;
660 start_notice_events_timer (si, w, p->verbose_p);
661 #else /* !DEBUG_TIMERS */
662 start_notice_events_timer (si, w, False);
663 #endif /* !DEBUG_TIMERS */
676 if (event.xany.type == MotionNotify)
677 fprintf (stderr,"%s: MotionNotify at %s\n",blurb(),timestring());
678 else if (event.xany.type == KeyPress)
679 fprintf (stderr, "%s: KeyPress seen on 0x%X at %s\n", blurb(),
680 (unsigned int) event.xkey.window, timestring ());
681 else if (event.xany.type == ButtonPress)
682 fprintf (stderr, "%s: ButtonPress seen on 0x%X at %s\n", blurb(),
683 (unsigned int) event.xbutton.window, timestring ());
685 #endif /* DEBUG_TIMERS */
687 /* If any widgets want to handle this event, let them. */
688 dispatch_event (si, &event);
690 /* We got a user event.
691 If we're waiting for the user to become active, this is it.
692 If we're waiting until the user becomes idle, reset the timers
693 (since now we have longer to wait.)
698 (event.xany.type == MotionNotify ||
699 event.xany.type == KeyRelease))
700 /* When we're demoing a single hack, mouse motion doesn't
701 cause deactivation. Only clicks and keypresses do. */
704 /* If we're not demoing, then any activity causes deactivation.
715 #ifdef HAVE_MIT_SAVER_EXTENSION
716 if (event.type == si->mit_saver_ext_event_number)
718 /* This event's number is that of the MIT-SCREEN-SAVER server
719 extension. This extension has one event number, and the event
720 itself contains sub-codes that say what kind of event it was
721 (an "idle" or "not-idle" event.)
723 XScreenSaverNotifyEvent *sevent =
724 (XScreenSaverNotifyEvent *) &event;
725 if (sevent->state == ScreenSaverOn)
729 fprintf (stderr, "%s: MIT ScreenSaverOn event received.\n",
732 /* Get the "real" server window(s) out of the way as soon
734 for (i = 0; i < si->nscreens; i++)
736 saver_screen_info *ssi = &si->screens[i];
737 if (ssi->server_mit_saver_window &&
738 window_exists_p (si->dpy,
739 ssi->server_mit_saver_window))
740 XUnmapWindow (si->dpy, ssi->server_mit_saver_window);
743 if (sevent->kind != ScreenSaverExternal)
746 "%s: ScreenSaverOn event wasn't of type External!\n",
753 else if (sevent->state == ScreenSaverOff)
756 fprintf (stderr, "%s: MIT ScreenSaverOff event received.\n",
763 "%s: unknown MIT-SCREEN-SAVER event %d received!\n",
764 blurb(), sevent->state);
768 #endif /* HAVE_MIT_SAVER_EXTENSION */
771 #ifdef HAVE_SGI_SAVER_EXTENSION
772 if (event.type == (si->sgi_saver_ext_event_number + ScreenSaverStart))
774 /* The SGI SCREEN_SAVER server extension has two event numbers,
775 and this event matches the "idle" event. */
777 fprintf (stderr, "%s: SGI ScreenSaverStart event received.\n",
783 else if (event.type == (si->sgi_saver_ext_event_number +
786 /* The SGI SCREEN_SAVER server extension has two event numbers,
787 and this event matches the "idle" event. */
789 fprintf (stderr, "%s: SGI ScreenSaverEnd event received.\n",
795 #endif /* HAVE_SGI_SAVER_EXTENSION */
797 /* Just some random event. Let the Widgets handle it, if desired. */
798 dispatch_event (si, &event);
804 /* If there's a user event on the queue, swallow it.
805 If we're using a server extension, and the user becomes active, we
806 get the extension event before the user event -- so the keypress or
807 motion or whatever is still on the queue. This makes "unfade" not
808 work, because it sees that event, and bugs out. (This problem
809 doesn't exhibit itself without an extension, because in that case,
810 there's only one event generated by user activity, not two.)
812 if (!until_idle_p && si->locked_p)
813 swallow_unlock_typeahead_events (si, &event);
815 while (XCheckMaskEvent (si->dpy,
816 (KeyPressMask|ButtonPressMask|PointerMotionMask),
821 if (si->check_pointer_timer_id)
823 XtRemoveTimeOut (si->check_pointer_timer_id);
824 si->check_pointer_timer_id = 0;
828 XtRemoveTimeOut (si->timer_id);
832 if (until_idle_p && si->cycle_id) /* no cycle timer when inactive */
840 /* Some crap for dealing with /proc/interrupts.
842 On Linux systems, it's possible to see the hardware interrupt count
843 associated with the keyboard. We can therefore use that as another method
844 of detecting idleness.
846 Why is it a good idea to do this? Because it lets us detect keyboard
847 activity that is not associated with X events. For example, if the user
848 has switched to another virtual console, it's good for xscreensaver to not
849 be running graphics hacks on the (non-visible) X display. The common
850 complaint that checking /proc/interrupts addresses is that the user is
851 playing Quake on a non-X console, and the GL hacks are perceptibly slowing
854 This is tricky for a number of reasons.
856 * First, we must be sure to only do this when running on an X server that
857 is on the local machine (because otherwise, we'd be reacting to the
858 wrong keyboard.) The way we do this is by noting that the $DISPLAY is
859 pointing to display 0 on the local machine. It *could* be that display
860 1 is also on the local machine (e.g., two X servers, each on a different
861 virtual-terminal) but it's also possible that screen 1 is an X terminal,
862 using this machine as the host. So we can't take that chance.
864 * Second, one can only access these interrupt numbers in a completely
865 and utterly brain-damaged way. You would think that one would use an
866 ioctl for this. But no. The ONLY way to get this information is to
867 open the pseudo-file /proc/interrupts AS A FILE, and read the numbers
868 out of it TEXTUALLY. Because this is Unix, and all the world's a file,
869 and the only real data type is the short-line sequence of ASCII bytes.
871 Now it's all well and good that the /proc/interrupts pseudo-file
872 exists; that's a clever idea, and a useful API for things that are
873 already textually oriented, like shell scripts, and users doing
874 interactive debugging sessions. But to make a *C PROGRAM* open a file
875 and parse the textual representation of integers out of it is just
878 * Third, you can't just hold the file open, and fseek() back to the
879 beginning to get updated data! If you do that, the data never changes.
880 And I don't want to call open() every five seconds, because I don't want
881 to risk going to disk for any inodes. It turns out that if you dup()
882 it early, then each copy gets fresh data, so we can get around that in
883 this way (but for how many releases, one might wonder?)
885 * Fourth, the format of the output of the /proc/interrupts file is
886 undocumented, and has changed several times already! In Linux 2.0.33,
887 even on a multiprocessor machine, it looks like this:
892 but on later kernels with MP machines, it looks like this:
895 0: 1671450 1672618 IO-APIC-edge timer
896 1: 13037 13495 IO-APIC-edge keyboard
898 Joy! So how are we expected to parse that? Well, this code doesn't
899 parse it: it saves the last line with the string "keyboard" in it, and
900 does a string-comparison to note when it has changed.
902 Thanks to Nat Friedman <nat@nat.org> for figuring out all of this crap.
904 Note that this only checks for lines with "keyboard" or "PS/2 Mouse" in
905 them. If you have a serial mouse, it won't detect that, it will only detect
906 keyboard activity. That's because there's no way to tell the difference
907 between a serial mouse and a general serial port, and it would be somewhat
908 unfortunate to have the screensaver turn off when the modem on COM1 burped.
912 #ifdef HAVE_PROC_INTERRUPTS
914 #define PROC_INTERRUPTS "/proc/interrupts"
917 query_proc_interrupts_available (saver_info *si, const char **why)
919 /* We can use /proc/interrupts if $DISPLAY points to :0, and if the
920 "/proc/interrupts" file exists and is readable.
925 if (!display_is_on_console_p (si))
927 if (why) *why = "not on primary console";
931 f = fopen (PROC_INTERRUPTS, "r");
941 proc_interrupts_activity_p (saver_info *si)
946 static char last_kbd_line[255] = { 0, };
947 static char last_ptr_line[255] = { 0, };
948 char new_line[sizeof(last_kbd_line)];
949 Bool got_kbd = False, kbd_diff = False;
950 Bool got_ptr = False, ptr_diff = False;
954 /* First time -- open the file. */
955 f0 = fopen (PROC_INTERRUPTS, "r");
959 sprintf(buf, "%s: error opening %s", blurb(), PROC_INTERRUPTS);
965 if (f0 == (FILE *) -1) /* means we got an error initializing. */
968 fd = dup (fileno (f0));
972 sprintf(buf, "%s: could not dup() the %s fd", blurb(), PROC_INTERRUPTS);
977 f1 = fdopen (fd, "r");
981 sprintf(buf, "%s: could not fdopen() the %s fd", blurb(),
987 /* Actually, I'm unclear on why this fseek() is necessary, given the timing
988 of the dup() above, but it is. */
989 if (fseek (f1, 0, SEEK_SET) != 0)
992 sprintf(buf, "%s: error rewinding %s", blurb(), PROC_INTERRUPTS);
997 /* Now read through the pseudo-file until we find the "keyboard" line. */
999 while (fgets (new_line, sizeof(new_line)-1, f1))
1001 if (!got_kbd && strstr (new_line, "keyboard"))
1003 kbd_diff = (*last_kbd_line && !!strcmp (new_line, last_kbd_line));
1004 strcpy (last_kbd_line, new_line);
1007 else if (!got_ptr && strstr (new_line, "PS/2 Mouse"))
1009 ptr_diff = (*last_ptr_line && !!strcmp (new_line, last_ptr_line));
1010 strcpy (last_ptr_line, new_line);
1014 if (got_kbd && got_ptr)
1018 if (got_kbd || got_ptr)
1021 return (kbd_diff || ptr_diff);
1025 /* If we got here, we didn't find either a "keyboard" or a "PS/2 Mouse"
1026 line in the file at all. */
1027 fprintf (stderr, "%s: no keyboard or mouse data in %s?\n",
1028 blurb(), PROC_INTERRUPTS);
1034 if (f0 && f0 != (FILE *) -1)
1041 #endif /* HAVE_PROC_INTERRUPTS */
1044 /* This timer goes off every few minutes, whether the user is idle or not,
1045 to try and clean up anything that has gone wrong.
1047 It calls disable_builtin_screensaver() so that if xset has been used,
1048 or some other program (like xlock) has messed with the XSetScreenSaver()
1049 settings, they will be set back to sensible values (if a server extension
1050 is in use, messing with xlock can cause xscreensaver to never get a wakeup
1051 event, and could cause monitor power-saving to occur, and all manner of
1054 If the screen is currently blanked, it raises the window, in case some
1055 other window has been mapped on top of it.
1057 If the screen is currently blanked, and there is no hack running, it
1058 clears the window, in case there is an error message printed on it (we
1059 don't want the error message to burn in.)
1063 watchdog_timer (XtPointer closure, XtIntervalId *id)
1065 saver_info *si = (saver_info *) closure;
1067 disable_builtin_screensaver (si, False);
1069 if (si->screen_blanked_p)
1071 Bool running_p = screenhack_running_p (si);
1076 if (si->prefs.verbose_p)
1077 fprintf (stderr, "%s: dialog box is up: not raising screen.\n",
1079 #endif /* DEBUG_TIMERS */
1084 if (si->prefs.verbose_p)
1085 fprintf (stderr, "%s: watchdog timer raising %sscreen.\n",
1086 blurb(), (running_p ? "" : "and clearing "));
1087 #endif /* DEBUG_TIMERS */
1089 raise_window (si, True, True, running_p);
1092 if (!monitor_powered_on_p (si))
1094 if (si->prefs.verbose_p)
1096 "%s: server reports that monitor has powered down; "
1097 "killing running hacks.\n", blurb());
1098 kill_screenhack (si);
1101 /* Re-schedule this timer. The watchdog timer defaults to a bit less
1102 than the hack cycle period, but is never longer than one hour.
1104 si->watchdog_id = 0;
1105 reset_watchdog_timer (si, True);
1111 reset_watchdog_timer (saver_info *si, Bool on_p)
1113 saver_preferences *p = &si->prefs;
1115 if (si->watchdog_id)
1117 XtRemoveTimeOut (si->watchdog_id);
1118 si->watchdog_id = 0;
1121 if (on_p && p->watchdog_timeout)
1123 si->watchdog_id = XtAppAddTimeOut (si->app, p->watchdog_timeout,
1124 watchdog_timer, (XtPointer) si);
1128 fprintf (stderr, "%s: restarting watchdog_timer (%ld, %ld)\n",
1129 blurb(), p->watchdog_timeout, si->watchdog_id);
1130 #endif /* DEBUG_TIMERS */