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Date: Thu, 24 Jul 2014 14:22:00 +0200
From: jdzstz <jdzstz AT gmail DOT com>
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To: cygwin <cygwin AT cygwin DOT com>
Subject: Bug executing "write" at Cygwin 1.7.31-2
References: <CA+wAnvyrB2ecwdJsvzqmMNjPFTnW6rT0rYdNcXRbK4z5WJqwyg AT mail DOT gmail DOT com>
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Hello,

I am preparing the new version 4.0.1 of Varnish.
I am using a Windows 8.1 machine, with all hotfix installed.

I have updated cygwin to 1.7.31-2 and launch Varnish package tests and 
some failed at "write" function.

After some investigations downloading snapshots, I have verified that:

  * Varnish tests works fine using 20140625 snapshot, downloaded from
    http://cygwin.com/snapshots/x86_64/cygwin1-20140625.dll.xz
  * Varnish tests fails using the next snapshot: 20140707, downloaded
    from http://cygwin.com/snapshots/x86_64/cygwin1-20140707.dll.xz

When installing 20140707 snapshot or 1.7.31-2 release, all the 
problematic tests fails with similar messages:

 1. ---- s1    1.5 Write failed: (212992 vs 1048234) No error
 2. *    s1    1.7 Write failed: (212992 vs 1572908) No error
 3. *    s1    1.7 Write failed: (212992 vs 500009) No error


This message is written by following code, at vtc_http.c file:

    /**********************************************************************
      * Finish and write the vsb to the fd
      */

    static void
    http_write(const struct http *hp, int lvl, const char *pfx)
    {
         ssize_t l;

         AZ(VSB_finish(hp->vsb));
         vtc_dump(hp->vl, lvl, pfx, VSB_data(hp->vsb), VSB_len(hp->vsb));
         l = write(hp->fd, VSB_data(hp->vsb), VSB_len(hp->vsb));
         if (l != VSB_len(hp->vsb))
             vtc_log(hp->vl, hp->fatal, "Write failed: (%zd vs %zd) %s",
                 l, VSB_len(hp->vsb), strerror(errno));
    }


hp->fd is a TCP socket and it seems that "write" function is only 
writing 212992 bytes for some strange reason

I will continue doing some investigations, but it seems that the problem 
is caused by some modification of that 20140707 snapshot: 
https://cygwin.com/snapshots/x86_64/winsup-diffs-20140625-20140707

Thank you,
Jorge


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