I've used the "pass" statement for pass-through control to handle a custom MIB
I've written. This works great. The problem is that I now want to return a
large amount of data that has to be collected. So "pass" will kick off my
program, the program will parse the large amount of data and then return the
field in question. When the next item in my sequence is asked for the entires
process has to repeat. I much rather would have a program that is running
separately that parses the data once and then stores it internally. When it's
asked for an OID it would just return the stored data (no collecting and
parsing needed).
I've read the man pages about "pass_persist" but I'm very confused by it.
1) Can the program on the pass_persist line already be running or does it have
to be kicked off by snmpd?
2) If snmpd kicks it off then what happens when the second request comes in?
If the program is still running does snmpd launch another instance of it or
does it send the request the program already running?
3) The man page says that pass and pass_persist block until they return. If
the point of pass_persist it to have the program continue to run after the
request is answered how does this work if snmpd is paused waiting for the
pass_persist program to return?
3) The example in the package uses a Perl script. I only have a rudimentary
knowledge of Perl. I will need to write C program for what I want to do.
From what I can tell the Perl script loops until there is nothing else left to
be read on standard input. I tried to mimc the Perl script's logic in a C
program but I get no response when I try a getnext to my custom MIB.
Thank you!
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