Re: Running external program, getting output

[sk <noname@myob.com>]

Whether you choose "popen" binding or AdaCL (I have not
looked at AdaCL yet), you probably do not want to use the
"Gnat.Os_Lib" spawn functions as well.

If you look at the source for Gnat.Os_Lib.Spawn, and follow
the code trail to the "C" source file "a-adainit.c", function
"__gnat_portable_spawn", you will see the typical

fork ()
if child then

     -- do child stuff

else -- if parent

     -- do parent stuff

end if;

So, if you use Gnat.Os_Lib.Spawn and also implement "popen",
or similar, you will probably end up with a double spawn;
a situation *I* would prefer to avoid.

If you choose to implement yourself, rather than use either
J.Rogers "popen" binding or the AdaCL package(s), you might
use "__gnat_portable_spawn" as a starting point for your own
efforts.

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