-/* xscreensaver-command, Copyright (c) 1991-1999
- * by Jamie Zawinski <jwz@jwz.org>
+/* xscreensaver-command, Copyright (c) 1991-2013 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
#include <stdio.h>
#include <stdlib.h>
+#include <time.h>
#include <sys/time.h>
#include <sys/types.h>
# include <unistd.h>
#endif
-#include <X11/Xproto.h> /* for CARD32 */
+/* #include <X11/Xproto.h> / * for CARD32 */
#include <X11/Xlib.h>
#include <X11/Xatom.h>
#include <X11/Xutil.h> /* for XGetClassHint() */
#include <X11/Intrinsic.h> /* only needed to get through xscreensaver.h */
+
+/* You might think that to read an array of 32-bit quantities out of a
+ server-side property, you would pass an array of 32-bit data quantities
+ into XGetWindowProperty(). You would be wrong. You have to use an array
+ of longs, even if long is 64 bits (using 32 of each 64.)
+ */
+typedef long PROP32;
+
#include "remote.h"
#include "version.h"
Atom XA_VROOT;
Atom XA_SCREENSAVER, XA_SCREENSAVER_VERSION, XA_SCREENSAVER_RESPONSE;
-Atom XA_SCREENSAVER_ID, XA_SCREENSAVER_TIME, XA_SELECT, XA_DEMO;
-static Atom XA_ACTIVATE, XA_DEACTIVATE, XA_CYCLE, XA_NEXT, XA_PREV, XA_EXIT;
-static Atom XA_RESTART, XA_PREFS, XA_LOCK, XA_THROTTLE, XA_UNTHROTTLE;
+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;
+# 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) 1991-1999 Jamie Zawinski <jwz@jwz.org>.\n\
+ Version %s, copyright (c) 1991-%s 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 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\
+ -exit Causes the xscreensaver process to exit gracefully.\n\
+ This does nothing if the display is currently locked.\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\
+ the same command line arguments as last time. You shouldn't\n\
+ really need to do this, since xscreensaver notices when the\n\
+ .xscreensaver file has changed and re-reads it as needed.\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\
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\
+ For updates, check https://www.jwz.org/xscreensaver/\n\
\n";
+/* Note: The "-throttle" command is deprecated -- it predates the XDPMS
+ extension. Instead of using -throttle, users should instead just
+ power off the monitor (e.g., "xset dpms force off".) In a few
+ minutes, the xscreensaver daemon will notice that the monitor is
+ off, and cease running hacks.
+ */
+
#define USAGE() do { \
- fprintf (stderr, usage, progname, screensaver_version); exit (1); \
+ fprintf (stderr, usage, progname, screensaver_version, year); exit (1); \
} while(0)
+static int watch (Display *);
+
int
main (int argc, char **argv)
{
char *dpyname = 0;
Atom *cmd = 0;
long arg = 0L;
+ char *s;
+ Atom XA_WATCH = 0; /* kludge: not really an atom */
+ char year[5];
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;
+ s = strchr (screensaver_id, '-');
+ s = strrchr (s, '-');
+ s++;
+ strncpy (year, s, 4);
+ year[4] = 0;
+
for (i = 1; i < argc; i++)
{
const char *s = argv [i];
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_TIME;
+ else if (!strncmp (s, "-time", L)) cmd = &XA_SCREENSAVER_STATUS;
+ else if (!strncmp (s, "-watch", L)) cmd = &XA_WATCH;
else USAGE ();
if (cmd == &XA_SELECT || cmd == &XA_DEMO)
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)
{
XA_SCREENSAVER = XInternAtom (dpy, "SCREENSAVER", False);
XA_SCREENSAVER_ID = XInternAtom (dpy, "_SCREENSAVER_ID", False);
XA_SCREENSAVER_VERSION = XInternAtom (dpy, "_SCREENSAVER_VERSION",False);
- XA_SCREENSAVER_TIME = XInternAtom (dpy, "_SCREENSAVER_TIME", 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_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 == &XA_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);
+ so if we're issuing an activation command, wait a second.
+ No need to do this if stdin is not a tty, meaning we're not being
+ run from the command line.
+ */
+ if (isatty(0))
+ 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;
+ PROP32 *last = 0;
+
+ if (v) free (v);
+ XGetWindowAttributes (dpy, window, &xgwa);
+ XSelectInput (dpy, window, xgwa.your_event_mask | PropertyChangeMask);
+
+ while (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;
+ PROP32 *data = (PROP32 *) 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;
+ }
+ }
+ }
+}
projects / xscreensaver / blobdiff