Re: SNMP subagent in C + exec_command or similar

2010/5/7 Hársszegi Tibor <[email protected]>

> Hi,
>
> have tried exec_command not much luck :(
> I am trying to run scripts, like
>
> cat /proc/cpuinfo | grep vendor_id | awk '{print $3}'
>
> and similar.
> No matter how I tried using SHPROC or EXECPROC (although I don't really
> see SHPROC being handled at all anywhere in net-snmp)
> I didn't get the pipes being executed at all.
> Naturally I had to replace the command like this:
>
> /bin/cat /proc/cpuinfo | /usr/bin/grep vendor_id | /usr/bin/awk '{print
> $3}'
>
> but the output was
>
> "processor      : 0"
>
> so 'grep' was not taking place at all :(
> Any idea how to overcome this and make sure that system() is called instead
> of execv()
> ?
>

Another thought would be:

Since that command line actually had to spawn 3 sub-processes sort of
daisy-chained,
perhaps this might work instead (where a single sub-process is created, that
then creates
the daisy-chain (note: I haven't tried it, but its a simple experiment):

( /bin/cat /proc/cpuinfo | /usr/bin/grep vendor_id | /usr/bin/awk '{print
$3}')

Fulko

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