Re: Bidirectional io.open()...anyone got one?

[Rici Lake <lua@...>]

On 5-Jul-07, at 5:49 PM, Duck wrote:

> I suspect that this is a perennial question (judging by a quick look 
> at some list postings of the past)...
>
> ...but does anyone have either a patch or a package which implements a 
> bidirectional popen()? One which allows not just "r" xor "w" like the 
> standard version, but also "rw" so that I can use the file handle it 
> returns to push data into and get data out of the stdin/stdout of the 
> subprocess?

The mode for read-write is "r+", not "rw". That will work fine on BSDs, 
but Linux doesn't support bidirectional popen as far as I know.

> Oh, and which is portable between at least Linux and Windows, if not 
> also OS X and the BSDs?

Try Mark Edgar's implementation of spawn, available soon on LuaForge,
with a preliminary version available here: 
http://lua-users.org/wiki/ExtensionProposal