On Wed, Sep 02, 2009 at 11:11:39 -0600, Michael Burk wrote:

> This was a good idea; I tried it with one modification:  I determined
> earlier that the failure happens without indexing also, so I added just the
> line:
>     fcntl(datafd, F_GETFL, 0);
> and that fixed the problem as well. So I guess this is truly the minimal
> patch!
>

I tried to understand the program flow for sendbackup.c and
sendbackup_dump.c, and I agree with Dustin that it is "pretty crazy",
but as far as I can tell the only place that would generate the message
"index tee cannot write [" is from the following code found in
the "start_index()" function in sendbackup.c:

    just_written = full_write(3, ptr, bytes_read);
    if (just_written < (size_t)bytes_read) {
       error(_("index tee cannot write [%s]"), strerror(errno));
       /*NOTREACHED*/
    } else {



Tracing backwards from there, it appears that the file descriptor #3 in
this chunck of code will point to the same file as the "datafd"
referenced in the patch you have been trying only if client-side compression
is not turned on.  If it is turned on, it looks like fd #3 will instead
point to the input side of the process that is doing the compression.

So, if other avenues of research don't lead to a solution first, it
might be interesting to try turning on client side compression (both
with and without the one-line patch applied), to see if a similar error
occurs in that case (and if so, whether the error is still in the index-
tee-write operation or if the compression process complains instead).


Also, when switched to your one-line patch (where you call fnctl() on
"datafd" only), did you start getting the

  strange(?): sed: stdout: Resource temporarily unavailable

messages in the log file again?

                                                       Nathan

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