Bugs item #2015126, was opened at 2008-07-10 14:51
Message generated for change (Comment added) made by yangtse
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Category: libcurl
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Peter Lamberg (pelam)
Assigned to: Daniel Stenberg (bagder)
Summary: poll gives WSAEINVAL when POLLPRI is set in fdset.events

Initial Comment:
Hi

curl version: 7.18.2

Tried to build curl on VS 2005.
Single easy http fetch fails with CURLE_GOT_NOTHING.

Setting following in setup.h fixes the problem:
#undef POLLPRI
#define POLLPRI 0

The build uses Winsock 2.

The problem seems to be in Curl_socket_ready function.
Function sets POLLPRI bit to pollfd events field.

The POLLPRI seems to have value 0x0400 at least
in Windows platform sdk header winsock2.h.

poll (WSAPoll) then returns WSAEINVAL.

According to following page, POLLPRI is not among values for events field:
http://msdn.microsoft.com/en-us/library/ms740094(VS.85).aspx

My guess is that some windows update
added error checks that don't like POLLPRI.
Another possibility is that versions of the header files
have different values for POLLPRI.

Hope this helps...
Thanks for the cool software.

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Comment By: Yang Tse (yangtse)
Date: 2008-07-10 16:42

Message:
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Yes, MS maps priority (out-of-band) data to POLLRDBAND.

Can you verify if this patch works for you ?

Index: select.h
===================================================================
RCS file: /cvsroot/curl/curl/lib/select.h,v
retrieving revision 1.15
diff -u -r1.15 select.h
--- select.h 22 Jan 2008 14:52:54 -0000 1.15
+++ select.h 10 Jul 2008 16:30:20 -0000
@@ -43,6 +43,8 @@
 #define HAVE_POLL_FINE 1
 #define poll(x,y,z) WSAPoll((x),(y),(z))
 #if defined(_MSC_VER) && defined(POLLRDNORM)
+#undef POLLPRI
+#define POLLPRI POLLRDBAND
 #define HAVE_STRUCT_POLLFD 1
 #endif
 #endif

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Received on 2008-07-10