ftp://ftp.swin.edu.au/slackware/slackware-9.1/source/xap/xscreensaver/xscreensaver...

[xscreensaver] / driver / subprocs.c

diff --git a/driver/subprocs.c b/driver/subprocs.c
index 463b3189450310fbbeb2f8e5ae552c17537de79e..f7d8cc8f09aefdb6f72eb0ff579e62cecd2b2ba7 100644 (file)
--- a/driver/subprocs.c
+++ b/driver/subprocs.c
@@ -934,10 +934,15 @@ hack_subproc_environment (saver_screen_info *ssi)
      be the screen on which this particular hack is running -- not the display
      specification which the driver itself is using, since the driver ignores
      its screen number and manages all existing screens.
      be the screen on which this particular hack is running -- not the display
      specification which the driver itself is using, since the driver ignores
      its screen number and manages all existing screens.

+
+     Likewise, store a window ID in $XSCREENSAVER_WINDOW -- this will allow
+     us to (eventually) run multiple hacks in Xinerama mode, where each hack
+     has the same $DISPLAY but a different piece of glass.

    */
   saver_info *si = ssi->global;
   const char *odpy = DisplayString (si->dpy);
    */
   saver_info *si = ssi->global;
   const char *odpy = DisplayString (si->dpy);

-  char *ndpy = (char *) malloc(strlen(odpy) + 20);
+  char *ndpy = (char *) malloc (strlen(odpy) + 20);
+  char *nssw = (char *) malloc (40);

   char *s;
 
   strcpy (ndpy, "DISPLAY=");
   char *s;
 
   strcpy (ndpy, "DISPLAY=");


@@ -949,14 +954,23 @@ hack_subproc_environment (saver_screen_info *ssi)
   while (isdigit(*s)) s++;                     /* skip over dpy number */
   while (*s == '.') s++;                       /* skip over dot */
   if (s[-1] != '.') *s++ = '.';                        /* put on a dot */
   while (isdigit(*s)) s++;                     /* skip over dpy number */
   while (*s == '.') s++;                       /* skip over dot */
   if (s[-1] != '.') *s++ = '.';                        /* put on a dot */

-  sprintf(s, "%d", ssi->number);               /* put on screen number */
+  sprintf(s, "%d", ssi->real_screen_number);   /* put on screen number */
+
+  sprintf (nssw, "XSCREENSAVER_WINDOW=0x%lX",
+           (unsigned long) ssi->screensaver_window);

 
   /* Allegedly, BSD 4.3 didn't have putenv(), but nobody runs such systems
      any more, right?  It's not Posix, but everyone seems to have it. */
 #ifdef HAVE_PUTENV
   if (putenv (ndpy))
     abort ();
 
   /* Allegedly, BSD 4.3 didn't have putenv(), but nobody runs such systems
      any more, right?  It's not Posix, but everyone seems to have it. */
 #ifdef HAVE_PUTENV
   if (putenv (ndpy))
     abort ();

-  /* do not free(ndpy) -- see above. */
+  if (putenv (nssw))
+    abort ();
+
+  /* don't free ndpy/nssw -- 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 */
 }
 
 #endif /* HAVE_PUTENV */
 }