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

@@ -49,30 +49,34 @@
 int
 main(int argc, char * const argv[])
 {
-  Display       *display;
-  Window         w      = (Window)0;
-  GC             egc    = (GC)0;
-  XSegment      *lines  = NULL;
-  int            i;
+  Display  *display;
+  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 {
-      char *end;
+      winstr = argv[i];
+    }
+  }
+  if (! winstr) winstr = getenv("XSS_WINDOW");
+  if (winstr) {
+    char *end;
 
-      if (argv[i][0] == '0' && argv[i][1] == 'x') {
-        w = (Window)strtol(argv[i] + 2, &end, 16);
-      } else {
-        w = (Window)strtol(argv[i], &end, 10);
-      }
-      if ('\0' != *end) {
-        w = (Window)-1;
-        break;
-      }
+    if (winstr[0] == '0' && winstr[1] == 'x') {
+      w = (Window)strtol(winstr + 2, &end, 16);
+    } else {
+      w = (Window)strtol(winstr, &end, 10);
+    }
+    if ('\0' != *end) {
+      w = (Window)-1;
     }
   }
   if ((Window)-1 == w) {

xsswin.c

@@ -36,12 +36,14 @@ main(int argc, char * const argv[])
   }
 
   try {
-    int                  screen;
-    Cursor               invisible;
-    XSetWindowAttributes wa;
-    Window               root;
-    XColor               black;
-    int                  child;
+    int                   screen;
+    Cursor                invisible;
+    XSetWindowAttributes  wa;
+    Window                root;
+    XColor                black;
+    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);
@@ -65,29 +67,18 @@ 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) {
-        if (0 == strcmp(argv[i], "XSS_WINDOW")) {
-          nargv[i] = id;
-        } else {
-          nargv[i] = argv[i];
-        }
+    (void)snprintf(id, sizeof(id), "0x%lx", (unsigned long)w);
+    (void)setenv("XSS_WINDOW", id, 1);
+    for (i = 0; i < argc; i += 1) {
+      if (0 == strcmp(argv[i], "XSS_WINDOW")) {
+        nargv[i] = id;
+      } else {
+        nargv[i] = argv[i];
       }
-      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);
+    nargv[argc] = NULL;
+    (void)execvp(nargv[1], nargv + 1);
+    perror("exec");
   }
 
   if (display) {