From: Bertram Scharpf <lists@...>
Date: 2008-09-02T19:36:05+09:00
Subject: Re: rb_require() causes segfault

Hi,

Am Dienstag, 02. Sep 2008, 03:42:29 +0900 schrieb Bertram Scharpf:
> calling rb_require() with a file name that will not be found,
> causes a segmentation fault to be raised:
> 
>   ruby: [BUG] Segmentation fault
>   ruby 1.8.6 (2008-08-11) [i386-freebsd7]
> 
>   Abort trap: 6 (core dumped)

OK, I start to debug it.

The segfault happens in rb_rescue2()/eval.c, line 5501 at a
JUMP_TAG() statement. This is when the LoadError exception is
being handled, not in the actual rb_require() itself.

When I comment in the rb_raise() call below, the segfault won't
happen.

Would this information help somebody enlighten me what is going on
here?

Thanks in advance.

Bertram



                           Here's my code:
----------------------------------------------------------------
#include <ruby.h>

VALUE call_require( VALUE name)
{
    if (0) rb_raise( rb_eStandardError, "don't do it");
    return rb_require( (char *) name);
}

VALUE rescue_require( VALUE data, VALUE err)
{
    printf("Error: [[[%s]]]\n", RSTRING(rb_obj_as_string(err))->ptr);
    return Qnil;
}

void sure_require( char *name)
{
    rb_rescue( &call_require, (VALUE) name, &rescue_require, Qnil);
}

int main( int argc, char *argv)
{
    ruby_init();
    ruby_init_loadpath();
    sure_require( "nonexistent");
    return 0;
}
----------------------------------------------------------------


-- 
Bertram Scharpf
Stuttgart, Deutschland/Germany
http://www.bertram-scharpf.de