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From: Victor Porton <porton@narod.ru>
Newsgroups: comp.lang.ada
Subject: Re: Execute an OS command and capture output
Date: Mon, 13 Nov 2017 21:22:39 +0200
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Date: 2017-11-13T21:22:39+02:00
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Victor Porton wrote:

> Dmitry A. Kazakov wrote:
> 
>> On 2017-11-13 17:38, Victor Porton wrote:
>>> I need a (preferably portable, but only Linux would be well) way to
>>> execute an OS command with some input in stdin which I provide and
>>> capture the output from stdout.
>> 
>> It is a vague question because there are numerous methods of how the
>> input, output and error pipes are handled. E.g. by 0, 1, 2 tasks.
> 
> I need synchronous processing of input/output pipes. That is I need just
> provide a String variable for the input and receive a String value with
> the output after the command ends.

Hm, in a future version I may want to spawn asynchronously to reduce the 
number of tasks.

> However, I will most probably need also to terminate the spawned command
> after a timeout (not allow it to run more than 20 secs, for example). But
> this "timeout" functionality may be added later.
> 
>> Anyway see:
>> 
>> 1. GNAT's System.OS_Lib.Spawn, System.OS_Lib.Non_Blocking_Spawn.
>> 
>> 2. A more comfortable method would be to use GTK bindings (GLib
>> actually):
>> 
>>     http://www.dmitry-kazakov.de/ada/gtkada_contributions.htm#10
>> 
-- 
Victor Porton - http://portonvictor.org