From: Eero Saynatkari <ruby-ml@...>
Date: 2005-11-08T18:32:31+09:00
Subject: Re: crash of extension on rb_str_new2

newbie wrote:
> Hi, all
> I am integrating a 3rd party API with ruby extension. The code is
> roughly like this
> void my_function()
> {
>         char p[256];
> 	...//assign the value of p in the api
> 
> 	return rb_str_new2(p);//This cause a crash.
> }
> while if I change the last part a little bit as,
> 	VALUE str=rb_str_new2(p);
> 	return str;
> This seems not crashing
> 
> It looks like more related to ruby GC? Can anyone explain on this? and
> how to prevent this kind of crash?

p is a pointer to a local array which may be causing
the problem since the memory is released when you exit
the function's scope. You should probably be malloc()ing
the original string to char* p instead just in general
C programming terms.

That said, I am not quite sure why the second version
would work if that were the underlying cause here.

> Thanks!


E