--- libev/ev_select.c	2008/03/16 16:38:23	1.28
+++ libev/ev_select.c	2008/05/20 19:26:45	1.29
@@ -98,7 +98,7 @@
     int     word = fd / NFDBITS;
     fd_mask mask = 1UL << (fd % NFDBITS);
 
-    if (expect_false (vec_max < word + 1))
+    if (expect_false (vec_max <= word))
       {
         int new_max = word + 1;
 
@@ -147,6 +147,29 @@
       #if EV_SELECT_IS_WINSOCKET
       errno = WSAGetLastError ();
       #endif
+      #ifdef WSABASEERR
+      /* on windows, select returns incompatible error codes, fix this */
+      if (errno >= WSABASEERR && errno < WSABASEERR + 1000)
+        if (errno == WSAENOTSOCK)
+          errno = EBADF;
+        else
+          errno -= WSABASEERR;
+      #endif
+
+      #ifdef _WIN32
+      /* select on windows errornously returns EINVAL when no fd sets have been
+       * provided (this is documented). what microsoft doesn't tell you that this bug
+       * exists even when the fd sets are provided, so we have to check for this bug
+       * here and emulate by sleeping manually.
+       * we also get EINVAL when the timeout is invalid, but we ignore this case here
+       * and assume that EINVAL always means: you have to wait manually.
+       */
+      if (errno == EINVAL)
+        {
+          ev_sleep (timeout);
+          return;
+        }
+      #endif
 
       if (errno == EBADF)
         fd_ebadf (EV_A);