- Markus Duft pointed out in bug #2961796 that even though Interix has a

poll() function it doesn't quite work the way we want it so we must disable
  it, and he also provided a patch for it.

  http://curl.haxx.se/bug/view.cgi?id=2961796

CHANGES

@@ -7,6 +7,12 @@
                                   Changelog
 
 Daniel Stenberg (2 Mar 2010)
+- Markus Duft pointed out in bug #2961796 that even though Interix has a
+  poll() function it doesn't quite work the way we want it so we must disable
+  it, and he also provided a patch for it.
+
+  http://curl.haxx.se/bug/view.cgi?id=2961796
+
 - Made the pingpong timeout code properly deal with the response timeout AND
   the global timeout if set. Also, as was reported in the bug report #2956437
   by Ryan Chan, the time stamp to use as basis for the per command timeout was

RELEASE-NOTES

@@ -24,6 +24,7 @@ This release includes the following bugfixes:
  o superfluous blocking for OpenSSL-based SSL connects and multi interface
  o TFTP upload
  o FTP timeouts after file transferred completely
+ o skip poll() on Interix
 
 This release includes the following known bugs:
 
@@ -34,6 +35,6 @@ advice from friends like these:
 
  Steven M. Schweda, Yang Tse, Jack Zhang, Tom Donovan, Martin Hager,
  Daniel Fandrich, Patrick Monnerat, Pat Ray, Wesley Miaw, Ben Greear,
- Ryan Chan
+ Ryan Chan, Markus Duft
 
         Thanks! (and sorry if I forgot to mention someone)

m4/curl-functions.m4

@@ -5,7 +5,7 @@
 #                            | (__| |_| |  _ <| |___
 #                             \___|\___/|_| \_\_____|
 #
-# Copyright (C) 1998 - 2009, Daniel Stenberg, <daniel@haxx.se>, et al.
+# Copyright (C) 1998 - 2010, Daniel Stenberg, <daniel@haxx.se>, et al.
 #
 # This software is licensed as described in the file COPYING, which
 # you should have received as part of this distribution. The terms
@@ -3815,8 +3815,11 @@ AC_DEFUN([CURL_CHECK_FUNC_POLL], [
   tst_allow_poll="unknown"
   #
   case $host_os in
-    darwin*)
+    darwin*|interix*)
-      dnl poll does not work on this platform
+      dnl poll() does not work on these platforms
+      dnl Interix: "does provide poll(), but the implementing developer must
+      dnl have been in a bad mood, because poll() only works on the /proc
+      dnl filesystem here"
       curl_disallow_poll="yes"
       ;;
   esac