A couple little tweaks

* magic now looks for the XSS_WINDOW environment variable
* xsswin doesn't bother forking before execing now
* README provides a little introduction

README

@@ -1,7 +1,19 @@
 == xss ==
 
+[xss](http://woozle.org/~neale/src/xss) is a suite of X screensaver
+utilities.  With them, you can use shell scripts to glue the tools
+together to build your own screen saver and/or locker.  You can use any
+`xscreensaver` hack instead of the built-in `magic` hack, or you can use
+`xlock` if you prefer.
+
+
+The programs
+------------
+
 `xss` uses the decades-old MIT-SCREEN-SAVER extension to launch a
-program when the X server turns on the built-in screen saver.
+program when the X server turns on the built-in screen saver.  Unlike
+`xautolock`, `xss` blocks until the X server says it's time to do
+something.
 
 `xsswin` makes a full-screen black window and runs some other program,
 passing along the window ID in the environment (`$XSS_WINDOW`) and

magic.c

@@ -53,26 +53,30 @@ main(int argc, char * const argv[])
   Window    w      = (Window)0;
   GC        egc    = (GC)0;
   XSegment *lines  = NULL;
+  char     *winstr = NULL;
   int       i;
 
   for (i = 1; i < argc; i += 1) {
     if (0 == strcmp(argv[i], "-window-id")) {
       /* For compatibility reasons, just ignore */
-    } else if (w) {
+    } else if (winstr) {
       w = (Window)-1;
       break;
     } else {
+      winstr = argv[i];
+    }
+  }
+  if (! winstr) winstr = getenv("XSS_WINDOW");
+  if (winstr) {
     char *end;
 
-      if (argv[i][0] == '0' && argv[i][1] == 'x') {
+    if (winstr[0] == '0' && winstr[1] == 'x') {
-        w = (Window)strtol(argv[i] + 2, &end, 16);
+      w = (Window)strtol(winstr + 2, &end, 16);
     } else {
-        w = (Window)strtol(argv[i], &end, 10);
+      w = (Window)strtol(winstr, &end, 10);
     }
     if ('\0' != *end) {
       w = (Window)-1;
-        break;
-      }
     }
   }
   if ((Window)-1 == w) {

xsswin.c

@@ -41,7 +41,9 @@ main(int argc, char * const argv[])
     XSetWindowAttributes  wa;
     Window                root;
     XColor                black;
-    int                  child;
+    int                   i;
+    char                 *nargv[argc + 1];
+    char                  id[50];
 
     zero(wa);
     zero(black);
@@ -55,7 +57,7 @@ main(int argc, char * const argv[])
     w = XCreateWindow(display, root,
                       0, 0,
                       DisplayWidth(display, screen), DisplayHeight(display, screen), 0,
-                      CopyFromParent, InputOutput, CopyFromParent,
+                      CopyFromParent, CopyFromParent, CopyFromParent,
                       CWOverrideRedirect | CWBackPixel,
                       &wa);
     pmap = XCreateBitmapFromData(display, w, "\0", 1, 1);
@@ -65,12 +67,6 @@ main(int argc, char * const argv[])
     XMapRaised(display, w);
     XSync(display, False);
 
-    child = fork();
-    if (0 == child) {
-      char *nargv[argc + 1];
-      char id[50];
-      int i;
-
     (void)snprintf(id, sizeof(id), "0x%lx", (unsigned long)w);
     (void)setenv("XSS_WINDOW", id, 1);
     for (i = 0; i < argc; i += 1) {
@@ -83,11 +79,6 @@ main(int argc, char * const argv[])
     nargv[argc] = NULL;
     (void)execvp(nargv[1], nargv + 1);
     perror("exec");
-      exit(1);
-    }
-
-    /* XXX: maybe important to also watch for X events? */
-    (void)waitpid(-1, NULL, 0);
   }
 
   if (display) {