Re: SNMP subagent in C + exec_command or similar

2010/5/7 Fulko Hew <[email protected]>:
> 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}')


I doubt that will work.
Fundamentally, you need to invoke some form of shell (sh, bash, csh, etc),
since that is what will interpret the pipeline.
   Anything based on "exec" will invoke the binary that's specified first
on the command line - unless this is a shell binary, then it won't understand
the pipeline syntax.

As I said to Harsszegi earlier today, the simplest answer is to use the
utility function 'run_shell_command' which explicitly invokes a shell to
run the specified command.

Dave

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