[grand-rapids-pm-announce] driving a process [using pipes?]

[Al Tobey]

> Message: 2
> Date: Tue, 27 Sep 2005 08:41:44 -0500
> From: Cameron Walker <cameron.walker at fedex.com>
> Subject: [grand-rapids-pm-announce] driving a process [using pipes?]
> To: grand-rapids-pm-announce at pm.org
> Message-ID: <43394C18.8040606 at sac.fedex.com>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
> 
> I have a process (specifically the sybase 'ic' process) that I want to 
> send commands to and then recieve the output back for further processing.
> 
> I'm aware of how to send commands via
>     open(wp,"| ic")
>     print wp "sp_who"
>     print wp "go"
> etc and so on. On the other side I know how to read data in from a 
> process via
>     open(rp,"date |")
>     $input = <rp>

I think what you want is IPC::Open2 although I usually end up using
something heavier before too long like POE or IPC::Run.

use IPC::Open2;
my($read,$write); # will be auto-vivified Symbols
my $pid = open2( $read, $write, "ic" );

print $write "stuff\n";

my $result = <$read>;

There's also IPC::Open3 that provides STDERR along with STDIN and
STDOUT.

perldoc IPC::Open2
perldoc IPC::Open3
perldoc perlipc

perl -MCPAN -e install 'IPC::Run'
perldoc IPC::Run

-Al Tobey

> However, I cant figure out how to make these work together at the same 
> time. The 'ic' program apparently isnt smart enough for me to just feed 
> it the data on the command line so I _have_ to open an input pipe to the 
> thing in order to drive it. At this point my knowledge fails me. How do 
> I get the data back out?
> 
> I started to do a fork and quickly realized that that doesnt seem to 
> solve my problem. I've heard suggestions that I need to play with some 
> filehandles to deal with this but clearly Im to dense to comprehend what 
> I need to do.
> 
> If you have any ideas I would much appreciate a tip [ more like an 
> 'idiots guide' ].
> 
> Thanks.
> 
> 
> 
> 
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