[Caml-list] how to wrap a command line call correctly?

[Caml-list] how to wrap a command line call correctly?

[Florent Monnier]

Hi,

I would like to know how to wrap a command line call correctly?

I particular keep the same order of the output messages for stderr and
stdout correctly, how to handle the cases when there is something on
stdin or not, etc.

Thanks

Re: [Caml-list] how to wrap a command line call correctly?

[Malcolm Matalka]

You can use Jane St Async or Lwt, but your application needs to work
within that context for the best results (although I'm sure you can
do something clever here).  Otherwise you probably need to use the Unix
model or similar and write your own little select loop.  Or use threads
perhaps.

/M

Florent Monnier <monnier.florent@gmail.com> writes:

> Hi,
>
> I would like to know how to wrap a command line call correctly?
>
> I particular keep the same order of the output messages for stderr and
> stdout correctly, how to handle the cases when there is something on
> stdin or not, etc.
>
> Thanks

AW: [Caml-list] how to wrap a command line call correctly?

[Gerd Stolpmann]

Am 21.11.2012 20:53:40 schrieb(en) Florent Monnier:
> Hi,
> 
> I would like to know how to wrap a command line call correctly?
> 
> I particular keep the same order of the output messages for stderr and
> stdout correctly, how to handle the cases when there is something on
> stdin or not, etc.

There is no way to keep the order of output messages, except you assign  
stdout and stderr to the same descriptor.

Otherwise, the Shell library included in Ocamlnet is your friend:

http://projects.camlcity.org/projects/dl/ocamlnet-3.6.1/doc/html-main/Shell.html

Especially, it can also be used in a synchronous environment (no need  
to tie yourself to Lwt), but async usage is also possible.

Shell takes advantage of the fast posix_spawn calls so far provided by  
the OS (e.g. on Linux and OS X), which means a significant speed  
advantage compare to fork+exec.

Gerd


> 
> Thanks
> 
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Gerd Stolpmann, Darmstadt, Germany    gerd@gerd-stolpmann.de
Creator of GODI and camlcity.org.
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Company homepage:       http://www.gerd-stolpmann.de
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