-/* xscreensaver, Copyright (c) 1991-2002 Jamie Zawinski <jwz@jwz.org>
+/* xscreensaver, Copyright (c) 1991-2003 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 <ctype.h>
#include <X11/Xlib.h>
+
+#include <X11/Xlibint.h>
+
#include <X11/Xatom.h>
#include <X11/Intrinsic.h>
#include <X11/StringDefs.h>
#include <X11/Shell.h>
#include <X11/Xos.h>
+#include <time.h>
+#include <sys/time.h>
#include <netdb.h> /* for gethostbyname() */
#ifdef HAVE_XMU
# ifndef VMS
#endif /* 0 */
};
+#ifdef __GNUC__
+ __extension__ /* shut up about "string length is greater than the length
+ ISO C89 compilers are required to support" when including
+ the .ad file... */
+#endif
+
static char *defaults[] = {
#include "XScreenSaver_ad.h"
0
fflush (stdout);
fflush (stderr);
fprintf (stdout, "\
-xscreensaver %s, copyright (c) 1991-2002 by Jamie Zawinski <jwz@jwz.org>\n\
+xscreensaver %s, copyright (c) 1991-2003 by Jamie Zawinski <jwz@jwz.org>\n\
\n\
All xscreensaver configuration is via the `~/.xscreensaver' file.\n\
Rather than editing that file by hand, just run `xscreensaver-demo':\n\
that program lets you configure the screen saver graphically,\n\
including timeouts, locking, and display modes.\n\
-\n\
+\n",
+ si->version);
+ fprintf (stdout, "\
Just getting started? Try this:\n\
\n\
xscreensaver &\n\
For updates, online manual, and FAQ, please see the web page:\n\
\n\
http://www.jwz.org/xscreensaver/\n\
-\n",
- si->version);
+\n");
+
fflush (stdout);
fflush (stderr);
exit (1);
{
saver_info *si = global_si_kludge; /* I hate C so much... */
int i;
+ Bool fatal_p;
if (!real_stderr) real_stderr = stderr;
for (i = 0; i < si->nscreens; i++)
fprintf (real_stderr, "%s: screen %d: 0x%x, 0x%x, 0x%x\n",
blurb(), i,
- RootWindowOfScreen (si->screens[i].screen),
- si->screens[i].real_vroot,
- si->screens[i].screensaver_window);
+ (unsigned int) RootWindowOfScreen (si->screens[i].screen),
+ (unsigned int) si->screens[i].real_vroot,
+ (unsigned int) si->screens[i].screensaver_window);
fprintf (real_stderr, "\n"
"#######################################"
"#######################################\n\n");
- if (XmuPrintDefaultErrorMessage (dpy, error, real_stderr))
+ fatal_p = XmuPrintDefaultErrorMessage (dpy, error, real_stderr);
+
+ fatal_p = True; /* The only time I've ever seen a supposedly nonfatal error,
+ it has been BadImplementation / Xlib sequence lost, which
+ are in truth pretty damned fatal.
+ */
+
+ fprintf (real_stderr, "\n");
+
+ if (! fatal_p)
+ fprintf (real_stderr, "%s: nonfatal error.\n\n", blurb());
+ else
{
- fprintf (real_stderr, "\n");
if (si->prefs.xsync_p)
{
saver_exit (si, -1, "because of synchronous X Error");
" bug. That will cause xscreensaver to dump a `core' file to the\n"
" current directory. Please include the stack trace from that core\n"
" file in your bug report. *DO NOT* mail the core file itself!\n"
- " That won't work.\n"
+ " That won't work.\n");
+ fprintf (real_stderr,
"\n"
" http://www.jwz.org/xscreensaver/bugs.html explains how to create\n"
" the most useful bug reports, and how to examine core files.\n"
saver_exit (si, -1, 0);
}
}
- else
- fprintf (real_stderr, " (nonfatal.)\n");
+
return 0;
}
si->locking_disabled_p = True;
si->nolock_reason = "error getting password";
}
-#endif /* NO_LOCKING */
- hack_uid (si);
+ /* If locking is currently enabled, but the environment indicates that
+ we have been launched as GDM's "Background" program, then disable
+ locking just in case.
+ */
+ if (!si->locking_disabled_p && getenv ("RUNNING_UNDER_GDM"))
+ {
+ si->locking_disabled_p = True;
+ si->nolock_reason = "running under GDM";
+ }
+
+ /* If the server is XDarwin (MacOS X) then disable locking.
+ (X grabs only affect X programs, so you can use Command-Tab
+ to bring any other Mac program to the front, e.g., Terminal.)
+ */
+ if (!si->locking_disabled_p)
+ {
+ int op = 0, event = 0, error = 0;
+ Bool macos_p = False;
+
+#ifdef __APPLE__
+ /* Disable locking if *running* on Apple hardware, since we have no
+ reliable way to determine whether the server is running on MacOS.
+ Hopefully __APPLE__ means "MacOS" and not "Linux on Mac hardware"
+ but I'm not really sure about that.
+ */
+ macos_p = True;
+#endif
+
+ if (!macos_p)
+ /* This extension exists on the Apple X11 server, but not
+ on earlier versions of the XDarwin server. */
+ macos_p = XQueryExtension (si->dpy, "Apple-DRI", &op, &event, &error);
+
+ if (macos_p)
+ {
+ si->locking_disabled_p = True;
+ si->nolock_reason = "Cannot lock securely on MacOS X";
+ }
+ }
+
+#endif /* NO_LOCKING */
}
char *d = getenv ("DISPLAY");
if (!d || !*d)
{
- char ndpy[] = "DISPLAY=:0.0";
+ char *ndpy = strdup("DISPLAY=:0.0");
/* if (si->prefs.verbose_p) */ /* sigh, too early to test this... */
fprintf (stderr,
"%s: warning: $DISPLAY is not set: defaulting to \"%s\".\n",
blurb(), ndpy+8);
if (putenv (ndpy))
abort ();
+ /* don't free (ndpy) -- some implementations of putenv (BSD 4.4,
+ glibc 2.0) copy the argument, but some (libc4,5, glibc 2.1.2)
+ do not. So we must leak it (and/or the previous setting). Yay.
+ */
}
#endif /* HAVE_PUTENV */
XA_SCREENSAVER_RESPONSE = XInternAtom (si->dpy, "_SCREENSAVER_RESPONSE",
False);
XA_XSETROOT_ID = XInternAtom (si->dpy, "_XSETROOT_ID", False);
+ XA_ESETROOT_PMAP_ID = XInternAtom (si->dpy, "ESETROOT_PMAP_ID", False);
+ XA_XROOTPMAP_ID = XInternAtom (si->dpy, "_XROOTPMAP_ID", False);
XA_ACTIVATE = XInternAtom (si->dpy, "ACTIVATE", False);
XA_DEACTIVATE = XInternAtom (si->dpy, "DEACTIVATE", False);
XA_RESTART = XInternAtom (si->dpy, "RESTART", False);
if (p->verbose_p)
fprintf (stderr,
- "%s %s, copyright (c) 1991-2002 "
+ "%s %s, copyright (c) 1991-2003 "
"by Jamie Zawinski <jwz@jwz.org>.\n",
progname, si->version);
fprintf (stderr, "%s: in process %lu.\n", blurb(),
(unsigned long) getpid());
}
+}
+
+static void
+print_lock_failure_banner (saver_info *si)
+{
+ saver_preferences *p = &si->prefs;
/* If locking was not able to be initalized for some reason, explain why.
(This has to be done after we've read the lock_p resource.)
*/
- if (p->lock_p && si->locking_disabled_p)
+ if (si->locking_disabled_p)
{
p->lock_p = False;
fprintf (stderr, "%s: locking is disabled (%s).\n", blurb(),
"\t See the manual for details.\n",
blurb());
}
+
}
XtNvisual, ssi->current_visual,
XtNdepth, visual_depth (ssi->screen,
ssi->current_visual),
- 0);
+ NULL);
if (! found_any_writable_cells)
{
while (1)
{
Bool was_locked = False;
+
+ if (p->verbose_p)
+ fprintf (stderr, "%s: awaiting idleness.\n", blurb());
+
+ check_for_leaks ("unblanked A");
sleep_until_idle (si, True);
+ check_for_leaks ("unblanked B");
if (p->verbose_p)
{
ok_to_unblank = True;
do {
+ check_for_leaks ("blanked A");
sleep_until_idle (si, False); /* until not idle */
+ check_for_leaks ("blanked B");
+
maybe_reload_init_file (si);
#ifndef NO_LOCKING
si->lock_id = 0;
}
- if (p->verbose_p)
- fprintf (stderr, "%s: awaiting idleness.\n", blurb());
+ /* It's possible that a race condition could have led to the saver
+ window being unexpectedly still mapped. This can happen like so:
+
+ - screen is blanked
+ - hack is launched
+ - that hack tries to grab a screen image( it does this by
+ first unmapping the saver window, then remapping it.)
+ - hack unmaps window
+ - hack waits
+ - user becomes active
+ - hack re-maps window (*)
+ - driver kills subprocess
+ - driver unmaps window (**)
+
+ The race is that (*) might have been sent to the server before
+ the client process was killed, but, due to scheduling randomness,
+ might not have been received by the server until after (**).
+ In other words, (*) and (**) might happen out of order, meaning
+ the driver will unmap the window, and then after that, the
+ recently-dead client will re-map it. This leaves the user
+ locked out (it looks like a desktop, but it's not!)
+
+ To avoid this: after un-blanking the screen, sleep for a second,
+ and then really make sure the window is unmapped.
+ */
+ {
+ int i;
+ XSync (si->dpy, False);
+ sleep (1);
+ for (i = 0; i < si->nscreens; i++)
+ {
+ saver_screen_info *ssi = &si->screens[i];
+ Window w = ssi->screensaver_window;
+ XWindowAttributes xgwa;
+ XGetWindowAttributes (si->dpy, w, &xgwa);
+ if (xgwa.map_state != IsUnmapped)
+ {
+ if (p->verbose_p)
+ fprintf (stderr,
+ "%s: %d: client race! emergency unmap 0x%lx.\n",
+ blurb(), i, (unsigned long) w);
+ XUnmapWindow (si->dpy, w);
+ }
+ }
+ XSync (si->dpy, False);
+ }
}
}
static void analyze_display (saver_info *si);
+static void fix_fds (void);
int
main (int argc, char **argv)
memset(si, 0, sizeof(*si));
global_si_kludge = si; /* I hate C so much... */
+ fix_fds();
+
# undef ya_rand_init
ya_rand_init (0);
exit (1);
lock_initialization (si, &argc, argv);
+ print_lock_failure_banner (si);
if (p->xsync_p) XSynchronize (si->dpy, True);
False);
initialize_stderr (si);
+ handle_signals (si);
make_splash_dialog (si);
return 0;
}
+static void
+fix_fds (void)
+{
+ /* Bad Things Happen if stdin, stdout, and stderr have been closed
+ (as by the `sh incantation "xscreensaver >&- 2>&-"). When you do
+ that, the X connection gets allocated to one of these fds, and
+ then some random library writes to stderr, and random bits get
+ stuffed down the X pipe, causing "Xlib: sequence lost" errors.
+ So, we cause the first three file descriptors to be open to
+ /dev/null if they aren't open to something else already. This
+ must be done before any other files are opened (or the closing
+ of that other file will again free up one of the "magic" first
+ three FDs.)
+
+ We do this by opening /dev/null three times, and then closing
+ those fds, *unless* any of them got allocated as #0, #1, or #2,
+ in which case we leave them open. Gag.
+
+ Really, this crap is technically required of *every* X program,
+ if you want it to be robust in the face of "2>&-".
+ */
+ int fd0 = open ("/dev/null", O_RDWR);
+ int fd1 = open ("/dev/null", O_RDWR);
+ int fd2 = open ("/dev/null", O_RDWR);
+ if (fd0 > 2) close (fd0);
+ if (fd1 > 2) close (fd1);
+ if (fd2 > 2) close (fd2);
+}
+
+
\f
/* Processing ClientMessage events.
*/
else
{
char buf[100];
- sprintf (buf, "<<undefined atom 0x%04X>>", (unsigned long) atom);
+ sprintf (buf, "<<undefined atom 0x%04X>>", (unsigned int) atom);
return strdup (buf);
}
}
free (proto);
}
+
+static void
+bogus_clientmessage_warning (saver_info *si, XEvent *event)
+{
+ char *str = XGetAtomName_safe (si->dpy, event->xclient.message_type);
+ Window w = event->xclient.window;
+ char wdesc[255];
+ int screen = 0;
+
+ *wdesc = 0;
+ for (screen = 0; screen < si->nscreens; screen++)
+ if (w == si->screens[screen].screensaver_window)
+ {
+ strcpy (wdesc, "xscreensaver");
+ break;
+ }
+ else if (w == RootWindow (si->dpy, screen))
+ {
+ strcpy (wdesc, "root");
+ break;
+ }
+
+ if (!*wdesc)
+ {
+ XErrorHandler old_handler;
+ XClassHint hint;
+ XWindowAttributes xgwa;
+ memset (&hint, 0, sizeof(hint));
+ memset (&xgwa, 0, sizeof(xgwa));
+
+ XSync (si->dpy, False);
+ old_handler = XSetErrorHandler (ignore_all_errors_ehandler);
+ XGetClassHint (si->dpy, w, &hint);
+ XGetWindowAttributes (si->dpy, w, &xgwa);
+ XSync (si->dpy, False);
+ XSetErrorHandler (old_handler);
+ XSync (si->dpy, False);
+
+ screen = (xgwa.screen ? screen_number (xgwa.screen) : -1);
+
+ sprintf (wdesc, "%.20s / %.20s",
+ (hint.res_name ? hint.res_name : "(null)"),
+ (hint.res_class ? hint.res_class : "(null)"));
+ if (hint.res_name) XFree (hint.res_name);
+ if (hint.res_class) XFree (hint.res_class);
+ }
+
+ fprintf (stderr, "%s: %d: unrecognised ClientMessage \"%s\" received\n",
+ blurb(), screen, (str ? str : "(null)"));
+ fprintf (stderr, "%s: %d: for window 0x%lx (%s)\n",
+ blurb(), screen, (unsigned long) w, wdesc);
+ if (str) XFree (str);
+}
+
Bool
handle_clientmessage (saver_info *si, XEvent *event, Bool until_idle_p)
{
/* Preferences might affect our handling of client messages. */
maybe_reload_init_file (si);
- if (event->xclient.message_type != XA_SCREENSAVER)
+ if (event->xclient.message_type != XA_SCREENSAVER ||
+ event->xclient.format != 32)
{
- char *str;
- str = XGetAtomName_safe (si->dpy, event->xclient.message_type);
- fprintf (stderr, "%s: unrecognised ClientMessage type %s received\n",
- blurb(), (str ? str : "(null)"));
- if (str) XFree (str);
- return False;
- }
- if (event->xclient.format != 32)
- {
- fprintf (stderr, "%s: ClientMessage of format %d received, not 32\n",
- blurb(), event->xclient.format);
+ bogus_clientmessage_warning (si, event);
return False;
}
XSync (si->dpy, False);
}
- fflush (stdout);
- fflush (stderr);
- if (real_stdout) fflush (real_stdout);
- if (real_stderr) fflush (real_stderr);
- /* make sure error message shows up before exit. */
- if (real_stderr && stderr != real_stderr)
- dup2 (fileno(real_stderr), fileno(stderr));
-
- restart_process (si);
- exit (1); /* shouldn't get here; but if restarting didn't work,
- make this command be the same as EXIT. */
+ restart_process (si); /* does not return */
+ abort();
}
else
clientmessage_response (si, window, True,
# endif
}, { "XINERAMA", "Xinerama",
True
+ }, { "Apple-DRI", "Apple-DRI (XDarwin)",
+ True
},
};
}
return !not_on_console;
}
+
+
+/* Do a little bit of heap introspection...
+ */
+void
+check_for_leaks (const char *where)
+{
+#ifdef HAVE_SBRK
+ static unsigned long last_brk = 0;
+ int b = (unsigned long) sbrk(0);
+ if (last_brk && last_brk < b)
+ fprintf (stderr, "%s: %s: brk grew by %luK.\n",
+ blurb(), where,
+ (((b - last_brk) + 1023) / 1024));
+ last_brk = b;
+#endif /* HAVE_SBRK */
+}
projects / xscreensaver / blobdiff