1 /* xscreensaver-command, Copyright (c) 1991-2002
2 * by Jamie Zawinski <jwz@jwz.org>
4 * Permission to use, copy, modify, distribute, and sell this software and its
5 * documentation for any purpose is hereby granted without fee, provided that
6 * the above copyright notice appear in all copies and that both that
7 * copyright notice and this permission notice appear in supporting
8 * documentation. No representations are made about the suitability of this
9 * software for any purpose. It is provided "as is" without express or
20 #include <sys/types.h>
26 #include <X11/Xproto.h> /* for CARD32 */
28 #include <X11/Xatom.h>
29 #include <X11/Xutil.h> /* for XGetClassHint() */
32 #include <X11/Intrinsic.h> /* only needed to get through xscreensaver.h */
38 ERROR! you must not include vroot.h in this file
44 Atom XA_SCREENSAVER, XA_SCREENSAVER_VERSION, XA_SCREENSAVER_RESPONSE;
45 Atom XA_SCREENSAVER_ID, XA_SCREENSAVER_STATUS, XA_SELECT, XA_DEMO, XA_EXIT;
46 Atom XA_BLANK, XA_LOCK;
47 static Atom XA_ACTIVATE, XA_DEACTIVATE, XA_CYCLE, XA_NEXT, XA_PREV;
48 static Atom XA_RESTART, XA_PREFS, XA_THROTTLE, XA_UNTHROTTLE;
50 static char *screensaver_version;
51 static char *usage = "\n\
52 usage: %s -<option>\n\
54 This program provides external control of a running xscreensaver process.\n\
55 Version %s, copyright (c) 1991-2002 Jamie Zawinski <jwz@jwz.org>.\n\
57 The xscreensaver program is a daemon that runs in the background.\n\
58 You control a running xscreensaver process by sending it messages\n\
59 with this program, xscreensaver-command. See the man pages for\n\
60 details. These are the arguments understood by xscreensaver-command:\n\
62 -demo Ask the xscreensaver process to enter interactive demo mode.\n\
64 -prefs Ask the xscreensaver process to bring up the preferences\n\
67 -activate Turn on the screensaver (blank the screen), as if the user\n\
68 had been idle for long enough.\n\
70 -deactivate Turns off the screensaver (un-blank the screen), as if user\n\
71 activity had been detected.\n\
73 -cycle If the screensaver is active (the screen is blanked), then\n\
74 stop the current graphics demo and run a new one (chosen\n\
77 -next Like either -activate or -cycle, depending on which is more\n\
78 appropriate, except that the graphics hack that will be run\n\
79 is the next one in the list, instead of a randomly-chosen\n\
80 one. In other words, repeatedly executing -next will cause\n\
81 the xscreensaver process to invoke each graphics demo\n\
82 sequentially. (Though using the -demo option is probably\n\
83 an easier way to accomplish that.)\n\
85 -prev Like -next, but goes in the other direction.\n\
87 -select <N> Like -activate, but runs the Nth element in the list of\n\
88 hacks. By knowing what is in the `programs' list, and in\n\
89 what order, you can use this to activate the screensaver\n\
90 with a particular graphics demo. (The first element in the\n\
91 list is numbered 1, not 0.)\n\
93 -exit Causes the xscreensaver process to exit gracefully. This is\n\
94 roughly the same as killing the process with `kill', but it\n\
95 is easier, since you don't need to first figure out the pid.\n\
96 (Note that one must *never* kill xscreensaver with -9!)\n\
98 -restart Causes the screensaver process to exit and then restart with\n\
99 the same command line arguments as last time. Do this after\n\
100 you've changed your X resource settings, to cause\n\
101 xscreensaver to notice the changes.\n\
103 -lock Tells the running xscreensaver process to lock the screen\n\
104 immediately. This is like -activate, but forces locking as\n\
105 well, even if locking is not the default. If the saver is\n\
106 already active, this causes it to be locked as well.\n\
108 -throttle Temporarily switch to ``blank screen'' mode, and don't run\n\
109 any display modes at all, until the screensaver is next\n\
110 de-activated. This is useful if you're using a machine\n\
111 remotely, and you find that some display modes are using too\n\
114 -unthrottle Turn `-throttle' off and resume normal behavior.\n\
116 -version Prints the version of xscreensaver that is currently running\n\
117 on the display -- that is, the actual version number of the\n\
118 running xscreensaver background process, rather than the\n\
119 version number of xscreensaver-command.\n\
121 -time Prints the time at which the screensaver last activated or\n\
122 deactivated (roughly, how long the user has been idle or\n\
123 non-idle -- but not quite, since it only tells you when the\n\
124 screen became blanked or un-blanked.)\n\
126 -watch Prints a line each time the screensaver changes state: when\n\
127 the screen blanks, locks, unblanks, or when the running hack\n\
128 is changed. This option never returns; it is intended for\n\
129 by shell scripts that want to react to the screensaver in\n\
132 See the man page for more details.\n\
133 For updates, check http://www.jwz.org/xscreensaver/\n\
136 #define USAGE() do { \
137 fprintf (stderr, usage, progname, screensaver_version); exit (1); \
140 static int watch (Display *);
143 main (int argc, char **argv)
153 s = strrchr (progname, '/');
154 if (s) progname = s+1;
156 screensaver_version = (char *) malloc (5);
157 memcpy (screensaver_version, screensaver_id + 17, 4);
158 screensaver_version [4] = 0;
160 for (i = 1; i < argc; i++)
162 const char *s = argv [i];
164 if (s[0] == '-' && s[1] == '-') s++;
167 if (!strncmp (s, "-display", L)) dpyname = argv [++i];
168 else if (cmd) USAGE();
169 else if (!strncmp (s, "-activate", L)) cmd = &XA_ACTIVATE;
170 else if (!strncmp (s, "-deactivate", L)) cmd = &XA_DEACTIVATE;
171 else if (!strncmp (s, "-cycle", L)) cmd = &XA_CYCLE;
172 else if (!strncmp (s, "-next", L)) cmd = &XA_NEXT;
173 else if (!strncmp (s, "-prev", L)) cmd = &XA_PREV;
174 else if (!strncmp (s, "-select", L)) cmd = &XA_SELECT;
175 else if (!strncmp (s, "-exit", L)) cmd = &XA_EXIT;
176 else if (!strncmp (s, "-restart", L)) cmd = &XA_RESTART;
177 else if (!strncmp (s, "-demo", L)) cmd = &XA_DEMO;
178 else if (!strncmp (s, "-preferences",L)) cmd = &XA_PREFS;
179 else if (!strncmp (s, "-prefs",L)) cmd = &XA_PREFS;
180 else if (!strncmp (s, "-lock", L)) cmd = &XA_LOCK;
181 else if (!strncmp (s, "-throttle", L)) cmd = &XA_THROTTLE;
182 else if (!strncmp (s, "-unthrottle", L)) cmd = &XA_UNTHROTTLE;
183 else if (!strncmp (s, "-version", L)) cmd = &XA_SCREENSAVER_VERSION;
184 else if (!strncmp (s, "-time", L)) cmd = &XA_SCREENSAVER_STATUS;
185 else if (!strncmp (s, "-watch", L)) cmd = (Atom *) &watch;
188 if (cmd == &XA_SELECT || cmd == &XA_DEMO)
192 if (i+1 < argc && (1 == sscanf(argv[i+1], " %ld %c", &a, &c)))
204 /* no command may have a negative argument. */
208 /* SELECT must have a non-zero argument. */
209 if (cmd == &XA_SELECT)
214 /* no command other than SELECT and DEMO may have a non-zero argument. */
215 if (cmd != &XA_DEMO && cmd != &XA_SELECT)
221 /* For backward compatibility: -demo with no arguments used to send a
222 "DEMO 0" ClientMessage to the xscreensaver process, which brought up
223 the built-in demo mode dialog. Now that the demo mode dialog is no
224 longer built in, we bring it up by just running the "xscreensaver-demo"
227 Note that "-DEMO <n>" still sends a ClientMessage.
229 if (cmd == &XA_PREFS ||
230 (cmd == &XA_DEMO && arg == 0))
233 char *new_argv[] = { "xscreensaver-demo", 0, 0, 0, 0, 0 };
238 new_argv[ac++] = "-display";
239 new_argv[ac++] = dpyname;
242 if (cmd == &XA_PREFS)
243 new_argv[ac++] = "-prefs";
247 execvp (new_argv[0], new_argv); /* shouldn't return */
249 sprintf (buf, "%s: could not exec %s", progname, new_argv[0]);
258 if (!dpyname) dpyname = (char *) getenv ("DISPLAY");
264 "%s: warning: $DISPLAY is not set: defaulting to \"%s\".\n",
268 dpy = XOpenDisplay (dpyname);
271 fprintf (stderr, "%s: can't open display %s\n", progname,
272 (dpyname ? dpyname : "(null)"));
276 XA_VROOT = XInternAtom (dpy, "__SWM_VROOT", False);
277 XA_SCREENSAVER = XInternAtom (dpy, "SCREENSAVER", False);
278 XA_SCREENSAVER_ID = XInternAtom (dpy, "_SCREENSAVER_ID", False);
279 XA_SCREENSAVER_VERSION = XInternAtom (dpy, "_SCREENSAVER_VERSION",False);
280 XA_SCREENSAVER_STATUS = XInternAtom (dpy, "_SCREENSAVER_STATUS", False);
281 XA_SCREENSAVER_RESPONSE = XInternAtom (dpy, "_SCREENSAVER_RESPONSE", False);
282 XA_ACTIVATE = XInternAtom (dpy, "ACTIVATE", False);
283 XA_DEACTIVATE = XInternAtom (dpy, "DEACTIVATE", False);
284 XA_RESTART = XInternAtom (dpy, "RESTART", False);
285 XA_CYCLE = XInternAtom (dpy, "CYCLE", False);
286 XA_NEXT = XInternAtom (dpy, "NEXT", False);
287 XA_PREV = XInternAtom (dpy, "PREV", False);
288 XA_SELECT = XInternAtom (dpy, "SELECT", False);
289 XA_EXIT = XInternAtom (dpy, "EXIT", False);
290 XA_DEMO = XInternAtom (dpy, "DEMO", False);
291 XA_PREFS = XInternAtom (dpy, "PREFS", False);
292 XA_LOCK = XInternAtom (dpy, "LOCK", False);
293 XA_BLANK = XInternAtom (dpy, "BLANK", False);
294 XA_THROTTLE = XInternAtom (dpy, "THROTTLE", False);
295 XA_UNTHROTTLE = XInternAtom (dpy, "UNTHROTTLE", False);
299 if (cmd == (Atom *) &watch)
305 if (*cmd == XA_ACTIVATE || *cmd == XA_LOCK ||
306 *cmd == XA_NEXT || *cmd == XA_PREV || *cmd == XA_SELECT)
307 /* People never guess that KeyRelease deactivates the screen saver too,
308 so if we're issuing an activation command, wait a second. */
311 i = xscreensaver_command (dpy, *cmd, arg, True, NULL);
321 Window window = RootWindow (dpy, 0);
322 XWindowAttributes xgwa;
327 XGetWindowAttributes (dpy, window, &xgwa);
328 XSelectInput (dpy, window, xgwa.your_event_mask | PropertyChangeMask);
332 XNextEvent (dpy, &event);
333 if (event.xany.type == PropertyNotify &&
334 event.xproperty.state == PropertyNewValue &&
335 event.xproperty.atom == XA_SCREENSAVER_STATUS)
339 unsigned long nitems, bytesafter;
342 if (XGetWindowProperty (dpy,
343 RootWindow (dpy, 0), /* always screen #0 */
344 XA_SCREENSAVER_STATUS,
345 0, 999, False, XA_INTEGER,
346 &type, &format, &nitems, &bytesafter,
347 (unsigned char **) &data)
354 Bool changed = False;
355 Bool running = False;
357 if (type != XA_INTEGER || nitems < 3)
360 if (last) free (last);
361 if (data) free (data);
362 fprintf (stderr, "%s: bad status format on root window.\n",
367 tt = (time_t) data[1];
368 if (tt <= (time_t) 666000000L) /* early 1991 */
372 if (s[strlen(s)-1] == '\n')
375 if (!last || data[0] != last[0])
378 if (data[0] == XA_BLANK)
379 printf ("BLANK %s\n", s);
380 else if (data[0] == XA_LOCK)
381 printf ("LOCK %s\n", s);
382 else if (data[0] == 0)
383 printf ("UNBLANK %s\n", s);
393 for (i = 2; i < nitems; i++)
395 if (data[i] != last[i])
402 if (running && changed)
405 fprintf (stdout, "RUN", s);
406 for (i = 2; i < nitems; i++)
407 fprintf (stdout, " %d", (int) data[i]);
408 fprintf (stdout, "\n");
413 if (last) free (last);
418 if (last) free (last);
419 if (data) free (data);
420 fprintf (stderr, "%s: no saver status on root window.\n",