[mercury-users] How to capture the io stream for call_system/4?

[Ondrej Bojar]

Hi,

The module I'm attaching did not make it to the Manarchive yet, because it's not 
failsafe enough and contains weird workarounds for some things. You can use it 
as a sample, but I would actually suggest that we try to develop such a module 
in Manarchive together, because I need it as well.

exchange.m defines predicates launching a subprocess and exchanging line 
messages with it.

Another big drawbacks are:
- You can provide the *string* of command and args only, and shell crunches
   that, so you have all the stupid quotation issues;
   Providing list of args and a command name is definitely a missing alternative
   way.
- No proper error handling is done. What I ultimately want is to explicitly
   return signal/error code as an alternative to a message read.

Let me know if you were interested to start a proper Manarchive package (say 
'processes') development.

Cheers, O.

Peter Wang wrote:
> On 2007-03-25, doug.auclair at logicaltypes.com <doug.auclair at logicaltypes.com> wrote:
>> Dear all,
>>
>> Is there a way to redirect the (output, specifically) io of
>> io.call_system/4 so that Mercury can process it as a string?
> 
> Use a combination of pipe, fork, dup*, exec*, wait*.  Those are
> available in the posix binding in extras.  An easier way would be to
> make a binding to the popen() function.
> 
> Peter
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-- 
Ondrej Bojar (mailto:obo at cuni.cz / bojar at ufal.mff.cuni.cz)
http://www.cuni.cz/~obo
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