From e41363f983e45e61b9a6f6b1b2f906c7d39c5a54 Mon Sep 17 00:00:00 2001
From: root <root>
Date: Tue, 20 May 2008 19:26:45 +0000
Subject: *** empty log message ***

---
 Changes     |  5 ++++-
 ev_select.c | 25 ++++++++++++++++++++++++-
 2 files changed, 28 insertions(+), 2 deletions(-)

diff --git a/Changes b/Changes
index cab1e19..5303f34 100644
--- a/Changes
+++ b/Changes
@@ -1,6 +1,8 @@
 Revision history for libev, a high-performance and full-featured event loop.
 
-3.33
+3.4
+	- work around an (undocumented) bug in winsocket select: if you
+          provide only empty fd sets then select returns WSAEINVAL. how sucky.
         - use 1-based 2-heap for EV_MINIMAL, simplifies code, reduces
           codesize and makes for better cache-efficiency.
         - use 3-based 4-heap for !EV_MINIMAL. this makes better use
@@ -14,6 +16,7 @@ Revision history for libev, a high-performance and full-featured event loop.
         - improve ev_stat docs.
         - add portability requirements section.
 	- fix manpage headers etc.
+        - normalise WSA error codes to lower range on windows.
 
 3.31 Wed Apr 16 20:45:04 CEST 2008
 	- added last minute fix for ev_poll.c by Brandon Black.
diff --git a/ev_select.c b/ev_select.c
index 3b06654..5844b8b 100644
--- a/ev_select.c
+++ b/ev_select.c
@@ -98,7 +98,7 @@ select_modify (EV_P_ int fd, int oev, int nev)
     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 @@ select_poll (EV_P_ ev_tstamp timeout)
       #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);
-- 
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