NSCA using PROCESS_FILE

[Thomas Guyot-Sionnest]

> -----Original Message-----
> From: nagios-devel-bounces at lists.sourceforge.net 
> [mailto:nagios-devel-bounces at lists.sourceforge.net] On Behalf 
> Of Thomas Guyot-Sionnest
> Sent: February 28, 2007 8:25
> To: Nagios Developers List
> Subject: Re: [Nagios-devel] NSCA using PROCESS_FILE
> 
> I just checked on a host I'm building and apparently Nagios doesn't
> block on full pipe. So far I haven't had any dieing daemon 
> problems either.

Eh, I just realized my test could have been wrong... I restarted Nagios and
did an strace and yes, it won't block. However it won't write anything
either:

write(5, "[SERVICEPERFDATA]\t1172678948\t10."..., 58) = -1 EPIPE (Broken
pipe)


I'd like to see a option for pipes that would show the same behavior as
syslogd: fill the pipe, and don't block when the pipe if full. This mean we
won't loose data if the daemon is temporally down. Here's an example of
syslogd at work:

Writing to a non-full pipe:
writev(4, [{"Feb 28 11:13:03", 15}, {" ", 1}, {"hostname", 8}, {" ", 1},
{"root: test", 10}, {"\n", 1}], 6) = 36

Writing to a full pipe:
writev(4, [{"Feb 28 11:12:08", 15}, {" ", 1}, {"hostname", 8}, {" ", 1},
{"root: test", 10}, {"\n", 1}], 6) = -1 EAGAIN (Resource temporarily
unavailable)

Since writev should behave just like write I assume the difference is on the
file filehandle flags. The *_perfdata_file_mode= parameter could be used to
trigger this behavior, ex: "service_perfdata_file_mode=p".

Any chance this gets in in CVS HEAD? In 2.x? I could try to make a patch is
it can help, this seems like a trivial change to make it work.

Thomas
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