X-Git-Url: http://git.hungrycats.org/cgi-bin/gitweb.cgi?p=xscreensaver;a=blobdiff_plain;f=driver%2Fxscreensaver-command.c;h=a267f4e7538659fec2a1cc15a984f342bbd2a296;hp=15e86063d33b3cbc7b75423d3cf3784ed5dace62;hb=ffd8c0873576a9e3065696a624dce6b766b77062;hpb=6edc84f12f15860a71430c45e8392a5e4ef8203c

diff --git a/driver/xscreensaver-command.c b/driver/xscreensaver-command.c
index 15e86063..a267f4e7 100644
--- a/driver/xscreensaver-command.c
+++ b/driver/xscreensaver-command.c
@@ -1,4 +1,4 @@
-/* xscreensaver-command, Copyright (c) 1991-1995 Jamie Zawinski <jwz@mcom.com>
+/* xscreensaver-command, Copyright (c) 1991-2004 Jamie Zawinski <jwz@jwz.org>
  *
  * Permission to use, copy, modify, distribute, and sell this software and its
  * documentation for any purpose is hereby granted without fee, provided that
@@ -9,142 +9,424 @@
  * implied warranty.
  */
 
-#include "version.h"
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
 #include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <sys/time.h>
+#include <sys/types.h>
+
+#ifdef HAVE_UNISTD_H
+# include <unistd.h>
+#endif
+
+#include <X11/Xproto.h>		/* for CARD32 */
 #include <X11/Xlib.h>
 #include <X11/Xatom.h>
+#include <X11/Xutil.h>		/* for XGetClassHint() */
 #include <X11/Xos.h>
-#if __STDC__
-# include <stdlib.h>
-#endif
+
+#include <X11/Intrinsic.h>	/* only needed to get through xscreensaver.h */
+
+#include "remote.h"
+#include "version.h"
 
 #ifdef _VROOT_H_
 ERROR! you must not include vroot.h in this file
 #endif
 
+char *progname;
+
+Atom XA_VROOT;
+Atom XA_SCREENSAVER, XA_SCREENSAVER_VERSION, XA_SCREENSAVER_RESPONSE;
+Atom XA_SCREENSAVER_ID, XA_SCREENSAVER_STATUS, XA_SELECT, XA_DEMO, XA_EXIT;
+Atom XA_BLANK, XA_LOCK;
+static Atom XA_ACTIVATE, XA_DEACTIVATE, XA_CYCLE, XA_NEXT, XA_PREV;
+static Atom XA_RESTART, XA_PREFS, XA_THROTTLE, XA_UNTHROTTLE;
+
 static char *screensaver_version;
-static char *usage = "usage: %s -<switch>\n\
+# ifdef __GNUC__
+  __extension__   /* don't warn about "string length is greater than the
+                     length ISO C89 compilers are required to support" in the
+                     usage string... */
+# endif
+static char *usage = "\n\
+usage: %s -<option>\n\
 \n\
   This program provides external control of a running xscreensaver process.\n\
-  Version %s, copyright (c) 1991-1994 Jamie Zawinski <jwz@mcom.com>.\n\
-\n\
-  -demo		Enter interactive demo mode.\n\
-  -deactivate	Turns off the screensaver if it is on, as user input would.\n\
-  -activate	Turns it on as if the user had been idle for long enough.\n\
-  -cycle	Stops the current hack and runs a new one.\n\
-  -next		Like either -activate or -cycle, depending on which is more\n\
-		appropriate, except that the screenhack that will be run is\n\
-		the next one in the list of hacks, instead of a randomly-\n\
-		chosen one.  This option is good for looking at a demo of\n\
-		each of the hacks in place.\n\
-  -prev		Like -next, but goes in the other direction.\n\
-  -exit		Causes the screensaver process to exit.  It should be ok to\n\
-		just kill the process (NOT with -9!) but this is a slightly\n\
-		easier way.\n\
-  -restart	Causes the screensaver process to exit and then restart with\n\
-		the same command line arguments.  This is a good way of \n\
-		causing the screensaver to re-read the resource database.\n\
-  -lock         Same as -activate, but with immediate locking.\n\
-\n\
-  See the man page for more details.\n\n";
-
-static Window
-find_screensaver_window (dpy, progname)
-     Display *dpy;
-     char *progname;
-{
-  int i;
-  Window root = RootWindowOfScreen (DefaultScreenOfDisplay (dpy));
-  Window root2, parent, *kids;
-  unsigned int nkids;
-
-  if (! XQueryTree (dpy, root, &root2, &parent, &kids, &nkids))
-    abort ();
-  if (root != root2)
-    abort ();
-  if (parent)
-    abort ();
-  if (! (kids && nkids))
-    abort ();
-  for (i = 0; i < nkids; i++)
-    {
-      Atom type;
-      int format;
-      unsigned long nitems, bytesafter;
-      char *version;
-
-      if (XGetWindowProperty (dpy, kids[i],
-			      XInternAtom (dpy, "_SCREENSAVER_VERSION", False),
-			      0, 1, False, XA_STRING,
-			      &type, &format, &nitems, &bytesafter,
-			      (unsigned char **) &version)
-	  == Success
-	  && type != None)
-	return kids[i];
-    }
-  fprintf (stderr, "%s: no screensaver is running on display %s\n", progname,
-	   DisplayString (dpy));
-  exit (1);
-}
+  Version %s, copyright (c) 1991-2003 Jamie Zawinski <jwz@jwz.org>.\n\
+\n\
+  The xscreensaver program is a daemon that runs in the background.\n\
+  You control a running xscreensaver process by sending it messages\n\
+  with this program, xscreensaver-command.  See the man pages for\n\
+  details.  These are the arguments understood by xscreensaver-command:\n\
+\n\
+  -demo         Ask the xscreensaver process to enter interactive demo mode.\n\
+\n\
+  -prefs        Ask the xscreensaver process to bring up the preferences\n\
+                panel.\n\
+\n\
+  -activate     Turn on the screensaver (blank the screen), as if the user\n\
+                had been idle for long enough.\n\
+\n\
+  -deactivate   Turns off the screensaver (un-blank the screen), as if user\n\
+                activity had been detected.\n\
+\n\
+  -cycle        If the screensaver is active (the screen is blanked), then\n\
+                stop the current graphics demo and run a new one (chosen\n\
+                randomly.)\n\
+\n\
+  -next         Like either -activate or -cycle, depending on which is more\n\
+                appropriate, except that the graphics hack that will be run\n\
+                is the next one in the list, instead of a randomly-chosen\n\
+                one.  In other words, repeatedly executing -next will cause\n\
+                the xscreensaver process to invoke each graphics demo\n\
+                sequentially.  (Though using the -demo option is probably\n\
+                an easier way to accomplish that.)\n\
+\n\
+  -prev         Like -next, but goes in the other direction.\n\
+\n\
+  -select <N>   Like -activate, but runs the Nth element in the list of\n\
+                hacks.  By knowing what is in the `programs' list, and in\n\
+                what order, you can use this to activate the screensaver\n\
+                with a particular graphics demo.  (The first element in the\n\
+                list is numbered 1, not 0.)\n\
+\n\
+  -exit         Causes the xscreensaver process to exit gracefully.  This is\n\
+                roughly the same as killing the process with `kill', but it\n\
+                is easier, since you don't need to first figure out the pid.\n\
+                (Note that one must *never* kill xscreensaver with -9!)\n\
+\n\
+  -restart      Causes the screensaver process to exit and then restart with\n\
+                the same command line arguments as last time.  Do this after\n\
+                you've changed your X resource settings, to cause\n\
+                xscreensaver to notice the changes.\n\
+\n\
+  -lock         Tells the running xscreensaver process to lock the screen\n\
+                immediately.  This is like -activate, but forces locking as\n\
+                well, even if locking is not the default.  If the saver is\n\
+                already active, this causes it to be locked as well.\n\
+\n\
+  -throttle     Temporarily switch to ``blank screen'' mode, and don't run\n\
+                any display modes at all, until the screensaver is next\n\
+                de-activated.  This is useful if you're using a machine\n\
+                remotely, and you find that some display modes are using too\n\
+                much CPU.\n\
+\n\
+  -unthrottle   Turn `-throttle' off and resume normal behavior.\n\
+\n\
+  -version      Prints the version of xscreensaver that is currently running\n\
+                on the display -- that is, the actual version number of the\n\
+                running xscreensaver background process, rather than the\n\
+                version number of xscreensaver-command.\n\
+\n\
+  -time         Prints the time at which the screensaver last activated or\n\
+                deactivated (roughly, how long the user has been idle or\n\
+                non-idle -- but not quite, since it only tells you when the\n\
+                screen became blanked or un-blanked.)\n\
+\n\
+  -watch        Prints a line each time the screensaver changes state: when\n\
+                the screen blanks, locks, unblanks, or when the running hack\n\
+                is changed.  This option never returns; it is intended for\n\
+                by shell scripts that want to react to the screensaver in\n\
+                some way.\n\
+\n\
+  See the man page for more details.\n\
+  For updates, check http://www.jwz.org/xscreensaver/\n\
+\n";
 
+#define USAGE() do { \
+ fprintf (stderr, usage, progname, screensaver_version); exit (1); \
+ } while(0)
 
-#define USAGE() \
- { fprintf (stderr, usage, argv[0], screensaver_version); exit (1); }
+static int watch (Display *);
 
-void
-main (argc, argv)
-     int argc;
-     char **argv;
+int
+main (int argc, char **argv)
 {
   Display *dpy;
-  Window window;
-  XEvent event;
   int i;
-  char *message = 0, *dpyname = 0;
+  char *dpyname = 0;
+  Atom *cmd = 0;
+  long arg = 0L;
+  char *s;
+
+  progname = argv[0];
+  s = strrchr (progname, '/');
+  if (s) progname = s+1;
+
   screensaver_version = (char *) malloc (5);
   memcpy (screensaver_version, screensaver_id + 17, 4);
   screensaver_version [4] = 0;
+
   for (i = 1; i < argc; i++)
     {
-      char *s = argv [i];
-      int L = strlen (s);
+      const char *s = argv [i];
+      int L;
+      if (s[0] == '-' && s[1] == '-') s++;
+      L = strlen (s);
       if (L < 2) USAGE ();
       if (!strncmp (s, "-display", L))		dpyname = argv [++i];
-      else if (message) USAGE ()
-      else if (!strncmp (s, "-activate", L))	message = "ACTIVATE";
-      else if (!strncmp (s, "-deactivate", L))	message = "DEACTIVATE";
-      else if (!strncmp (s, "-cycle", L))	message = "CYCLE";
-      else if (!strncmp (s, "-next", L))	message = "NEXT";
-      else if (!strncmp (s, "-prev", L))	message = "PREV";
-      else if (!strncmp (s, "-exit", L))	message = "EXIT";
-      else if (!strncmp (s, "-restart", L))	message = "RESTART";
-      else if (!strncmp (s, "-demo", L))	message = "DEMO";
-      else if (!strncmp (s, "-lock", L))	message = "LOCK";
+      else if (cmd) USAGE();
+      else if (!strncmp (s, "-activate", L))   cmd = &XA_ACTIVATE;
+      else if (!strncmp (s, "-deactivate", L)) cmd = &XA_DEACTIVATE;
+      else if (!strncmp (s, "-cycle", L))      cmd = &XA_CYCLE;
+      else if (!strncmp (s, "-next", L))       cmd = &XA_NEXT;
+      else if (!strncmp (s, "-prev", L))       cmd = &XA_PREV;
+      else if (!strncmp (s, "-select", L))     cmd = &XA_SELECT;
+      else if (!strncmp (s, "-exit", L))       cmd = &XA_EXIT;
+      else if (!strncmp (s, "-restart", L))    cmd = &XA_RESTART;
+      else if (!strncmp (s, "-demo", L))       cmd = &XA_DEMO;
+      else if (!strncmp (s, "-preferences",L)) cmd = &XA_PREFS;
+      else if (!strncmp (s, "-prefs",L))       cmd = &XA_PREFS;
+      else if (!strncmp (s, "-lock", L))       cmd = &XA_LOCK;
+      else if (!strncmp (s, "-throttle", L))   cmd = &XA_THROTTLE;
+      else if (!strncmp (s, "-unthrottle", L)) cmd = &XA_UNTHROTTLE;
+      else if (!strncmp (s, "-version", L))    cmd = &XA_SCREENSAVER_VERSION;
+      else if (!strncmp (s, "-time", L))       cmd = &XA_SCREENSAVER_STATUS;
+      else if (!strncmp (s, "-watch", L))      cmd = (Atom *) &watch;
       else USAGE ();
+
+      if (cmd == &XA_SELECT || cmd == &XA_DEMO)
+	{
+	  long a;
+	  char c;
+	  if (i+1 < argc && (1 == sscanf(argv[i+1], " %ld %c", &a, &c)))
+	    {
+	      arg = a;
+	      i++;
+	    }
+	}
+    }
+
+  if (!cmd)
+    USAGE ();
+
+  if (arg < 0)
+    /* no command may have a negative argument. */
+    USAGE();
+  else if (arg == 0)
+    {
+      /* SELECT must have a non-zero argument. */
+      if (cmd == &XA_SELECT)
+	USAGE();
     }
-  if (! message) USAGE ();
+  else /* arg > 0 */
+    {
+      /* no command other than SELECT and DEMO may have a non-zero argument. */
+      if (cmd != &XA_DEMO && cmd != &XA_SELECT)
+	USAGE();
+    }
+
+
+
+  /* For backward compatibility: -demo with no arguments used to send a
+     "DEMO 0" ClientMessage to the xscreensaver process, which brought up
+     the built-in demo mode dialog.  Now that the demo mode dialog is no
+     longer built in, we bring it up by just running the "xscreensaver-demo"
+     program.
+
+     Note that "-DEMO <n>" still sends a ClientMessage.
+   */
+  if (cmd == &XA_PREFS ||
+      (cmd == &XA_DEMO && arg == 0))
+    {
+      char buf [512];
+      char *new_argv[] = { "xscreensaver-demo", 0, 0, 0, 0, 0 };
+      int ac = 1;
+
+      if (dpyname)
+	{
+	  new_argv[ac++] = "-display";
+	  new_argv[ac++] = dpyname;
+	}
+
+      if (cmd == &XA_PREFS)
+	new_argv[ac++] = "-prefs";
+
+      fflush(stdout);
+      fflush(stderr);
+      execvp (new_argv[0], new_argv);	/* shouldn't return */
+
+      sprintf (buf, "%s: could not exec %s", progname, new_argv[0]);
+      perror(buf);
+      fflush(stdout);
+      fflush(stderr);
+      exit (-1);
+    }
+
+
+
   if (!dpyname) dpyname = (char *) getenv ("DISPLAY");
+
+  if (!dpyname)
+    {
+      dpyname = ":0.0";
+      fprintf (stderr,
+               "%s: warning: $DISPLAY is not set: defaulting to \"%s\".\n",
+               progname, dpyname);
+    }
+
   dpy = XOpenDisplay (dpyname);
   if (!dpy)
     {
-      fprintf (stderr, "%s: can't open display %s\n", argv[0],
+      fprintf (stderr, "%s: can't open display %s\n", progname,
 	       (dpyname ? dpyname : "(null)"));
       exit (1);
     }
-  window = find_screensaver_window (dpy, argv[0]);
-
-  event.xany.type = ClientMessage;
-  event.xclient.display = dpy;
-  event.xclient.window = window;
-  event.xclient.message_type = XInternAtom (dpy, "SCREENSAVER", False);
-  event.xclient.format = 32;
-  event.xclient.data.l[0] = (long) XInternAtom (dpy, message, False);
-  if (! XSendEvent (dpy, window, False, 0L, &event))
+
+  XA_VROOT = XInternAtom (dpy, "__SWM_VROOT", False);
+  XA_SCREENSAVER = XInternAtom (dpy, "SCREENSAVER", False);
+  XA_SCREENSAVER_ID = XInternAtom (dpy, "_SCREENSAVER_ID", False);
+  XA_SCREENSAVER_VERSION = XInternAtom (dpy, "_SCREENSAVER_VERSION",False);
+  XA_SCREENSAVER_STATUS = XInternAtom (dpy, "_SCREENSAVER_STATUS", False);
+  XA_SCREENSAVER_RESPONSE = XInternAtom (dpy, "_SCREENSAVER_RESPONSE", False);
+  XA_ACTIVATE = XInternAtom (dpy, "ACTIVATE", False);
+  XA_DEACTIVATE = XInternAtom (dpy, "DEACTIVATE", False);
+  XA_RESTART = XInternAtom (dpy, "RESTART", False);
+  XA_CYCLE = XInternAtom (dpy, "CYCLE", False);
+  XA_NEXT = XInternAtom (dpy, "NEXT", False);
+  XA_PREV = XInternAtom (dpy, "PREV", False);
+  XA_SELECT = XInternAtom (dpy, "SELECT", False);
+  XA_EXIT = XInternAtom (dpy, "EXIT", False);
+  XA_DEMO = XInternAtom (dpy, "DEMO", False);
+  XA_PREFS = XInternAtom (dpy, "PREFS", False);
+  XA_LOCK = XInternAtom (dpy, "LOCK", False);
+  XA_BLANK = XInternAtom (dpy, "BLANK", False);
+  XA_THROTTLE = XInternAtom (dpy, "THROTTLE", False);
+  XA_UNTHROTTLE = XInternAtom (dpy, "UNTHROTTLE", False);
+
+  XSync (dpy, 0);
+
+  if (cmd == (Atom *) &watch)
+    {
+      i = watch (dpy);
+      exit (i);
+    }
+
+  if (*cmd == XA_ACTIVATE || *cmd == XA_LOCK ||
+      *cmd == XA_NEXT || *cmd == XA_PREV || *cmd == XA_SELECT)
+    /* People never guess that KeyRelease deactivates the screen saver too,
+       so if we're issuing an activation command, wait a second. */
+    sleep (1);
+
+  i = xscreensaver_command (dpy, *cmd, arg, True, NULL);
+  if (i < 0) exit (i);
+  else exit (0);
+}
+
+
+static int
+watch (Display *dpy)
+{
+  char *v = 0;
+  Window window = RootWindow (dpy, 0);
+  XWindowAttributes xgwa;
+  XEvent event;
+  CARD32 *last = 0;
+
+  if (v) free (v);
+  XGetWindowAttributes (dpy, window, &xgwa);
+  XSelectInput (dpy, window, xgwa.your_event_mask | PropertyChangeMask);
+
+  while (1)
     {
-      fprintf (stderr, "%s: XSendEvent(dpy, 0x%x ...) failed.\n", argv [0],
-	       (unsigned int) window);
-      exit (1);
+      XNextEvent (dpy, &event);
+      if (event.xany.type == PropertyNotify &&
+          event.xproperty.state == PropertyNewValue &&
+          event.xproperty.atom == XA_SCREENSAVER_STATUS)
+        {
+	  Atom type;
+	  int format;
+	  unsigned long nitems, bytesafter;
+          unsigned char *dataP = 0;
+
+	  if (XGetWindowProperty (dpy,
+                                  RootWindow (dpy, 0),  /* always screen #0 */
+				  XA_SCREENSAVER_STATUS,
+				  0, 999, False, XA_INTEGER,
+				  &type, &format, &nitems, &bytesafter,
+				  &dataP)
+	      == Success
+	      && type
+	      && dataP)
+	    {
+              time_t tt;
+              char *s;
+              Bool changed = False;
+              Bool running = False;
+              CARD32 *data = (CARD32 *) dataP;
+
+              if (type != XA_INTEGER || nitems < 3)
+                {
+                STATUS_LOSE:
+                  if (last) XFree (last);
+                  if (data) XFree (data);
+                  fprintf (stderr, "%s: bad status format on root window.\n",
+                           progname);
+                  return -1;
+                }
+                  
+              tt = (time_t) data[1];
+              if (tt <= (time_t) 666000000L) /* early 1991 */
+                goto STATUS_LOSE;
+
+              s = ctime(&tt);
+              if (s[strlen(s)-1] == '\n')
+                s[strlen(s)-1] = 0;
+
+              if (!last || data[0] != last[0])
+                {
+                  /* State changed. */
+                  if (data[0] == XA_BLANK)
+                    printf ("BLANK %s\n", s);
+                  else if (data[0] == XA_LOCK)
+                    printf ("LOCK %s\n", s);
+                  else if (data[0] == 0)
+                    printf ("UNBLANK %s\n", s);
+                  else
+                    goto STATUS_LOSE;
+                }
+
+              if (!last)
+                changed = True;
+              else
+                {
+                  int i;
+                  for (i = 2; i < nitems; i++)
+                    {
+                      if (data[i] != last[i])
+                        changed = True;
+                      if (data[i])
+                        running = True;
+                    }
+                }
+
+              if (running && changed)
+                {
+                  int i;
+                  fprintf (stdout, "RUN");
+                  for (i = 2; i < nitems; i++)
+                    fprintf (stdout, " %d", (int) data[i]);
+                  fprintf (stdout, "\n");
+                }
+
+              fflush (stdout);
+
+              if (last) XFree (last);
+              last = data;
+	    }
+	  else
+	    {
+	      if (last) XFree (last);
+	      if (dataP) XFree (dataP);
+	      fprintf (stderr, "%s: no saver status on root window.\n",
+		       progname);
+	      return -1;
+	    }
+        }
     }
-  XSync (dpy, 0);
-  exit (0);
 }