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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