Hello, today, I was debugging a CGI application, which after logging in, writes some HTML data to the document root and redirects the client to it. But the redirection was not successful, the request was answered with a closed connection. The entire response was missing. Since this runs on a clustered environment (DocumentRoot is shared over NFS), I thought this was an NFS problem, because I could receive the content on the second server. Long story short, I was off the track. After I set the LogLevel to debug the following message appeared in the ErrorLog: [info] [client 160.xx.xx.xx] (22)Invalid argument: core_output_filter: writing data to the network I grepped the httpd source for this message to get an idea what's going on here and found the FAQ entry. EnableSendfile Off, everything is fine now. But I really think that this should be at least an error instead of an info. httpd was not able to send the response, this is worse than "file not found" which is logged as an error. Here is the patch: --- server/core.c.orig 2006-07-12 09:40:55.000000000 +0200 +++ server/core.c 2008-10-10 17:21:36.000000000 +0200 @@ -4327,7 +4327,7 @@ } if (rv != APR_SUCCESS) { - ap_log_cerror(APLOG_MARK, APLOG_INFO, rv, c, + ap_log_cerror(APLOG_MARK, APLOG_ERR, rv, c, "core_output_filter: writing data to the network"); if (more) Regards, Danijel
I'd rather see it trap the specific errno, because this looks like the same path as a host of normal client issues which I don't agree should be loglevel error.
Hm, I see the problem. I agree with Marc. EAGAIN Non-blocking I/O has been selected using O_NONBLOCK and the write would block. EBADF The input file was not opened for reading or the output file was not opened for writing. EFAULT Bad address. EINVAL Descriptor is not valid or locked, or an mmap(2)-like operation is not available for in_fd. EIO Unspecified error while reading from in_fd. ENOMEM Insufficient memory to read from in_fd. This are the errors sendfile could raise. At least an error should be logged, if sendfile raises EIO, ENOMEN or EINVAL I'm not sure about about EFAULT, EBADF and EGAIN.
(In reply to comment #2) > Hm, I see the problem. I agree with Marc. > This are the errors sendfile could raise. At least an error should be > logged, if sendfile raises EIO, ENOMEN or EINVAL This log message is not sendfile-specific, though.
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