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- Subject: Re: whatever happened to io.popen() ?
- From: Roberto Ierusalimschy <roberto@...>
- Date: Thu, 02 Sep 2004 14:44:19 -0300
> Is there a clean way of creating new handles that'll work with the other
> functions in the io library, such that one could write an extension and
> put it in such a library?
> If so, where is it documented?
Right here :) You must create a userdata containing only the FILE* and
set its metatable to the value at REGISTRY["FILE*"]:
FILE **pf = (FILE **)lua_newuserdata(L, sizeof(FILE *));
*pf = popen or whatever...
> 'popen' is closed the same was as regular 'open'...
Yes, that's true. We will have to solve that problem...
> What's wrong with just having another flag in the userdata to say it's
> a popen,
That needs special support from iolib. Even if we agree to put popen
back there, we still have the problem for other external file handles