Re: what reason causes echo some date after command line snmpd &

2010/4/7 Dave Shield <[email protected]>

> 2010/4/7 黎明傲子 <[email protected]>:
> > successful,but if I enter the command line snmpd &,always some date
> appears,
> > like
> > # snmpd -f &
> > 36
> > I want to know why this happened,
>
> The charcter '&' means that you are running this command as a
> "background process".  The number that is displayed is the
> "process ID" of this process.
>
> This is a standard mechanism of most Unix shells.
> Any good book on Unix will explain about it.
> It's not particular to the Net-SNMP agent.
>
> > In addition,if I enter the command line
> > # snmpd -c /etc/snmpd.conf -f &
> > 39
> > # ps
> > .......................................................
> > 51   S0 Z      0K     0K  8.3 snmpd
>
> I'm surprised at this output - I'd expect it to display "51"
> instead of "39"
>

I'm not.  Although I haven't looked at net-snmpd's daemonizing code,
any application thats going to operate as a  (well behaved) daemon
is supposed to perform (at least) 2 fork() calls to 'detatch itself from
the controlling terminal', etc.

Fulko

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