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RE: C/C++ predicates for GNU-Prolog, help!

From: Joseph Benden
Subject: RE: C/C++ predicates for GNU-Prolog, help!
Date: Tue, 8 Jan 2002 09:17:40 -0500

Included are two files below.  One is in C, the second is a foreign
statement.  The command line used to compile is:

gplc segfault_c.c

When executed in 1.2.1, the application works with no problems.  Under the
newer versions, it always seg. faults.

The two tests are:

segfault(no,A).           <--- This does NOT seg. fault
segfault(yes,A).                  <--- This DOES seg. fault

----- segfault_c.c -------

#include <gprolog.h>
#include <stdlib.h>

Bool segfault( char *in, PlTerm out )
        if( strcmp(in,"yes") == 0 ) {
                printf("Calling system error\n");
                return FALSE;
        } else {
                Un_String_Check("Hello, World!", out);
                return TRUE;
        return FALSE;

----- --------

:- foreign(segfault(+string,+term)).

----- END ----------------

I hope this helps!

Joseph Benden
Systems Development/Network Administrator
AdWriter, Inc.

-----Original Message-----
From: address@hidden [mailto:address@hidden
Sent: Tuesday, January 08, 2002 6:03 AM
To: address@hidden
Cc: address@hidden
Subject: Re: C/C++ predicates for GNU-Prolog, help!

Hi Joseph,
this is an important information. Could you extract a piece of C and PL code
that we could use to
reproduce the bug ? Without this it is difficult to find where the problem
comes from and thus to
fix it. So a Prolog + a C (not C++ if possible) source and and example of
query (together with
instructions to compile) would be greatly appreciated...

> Joseph Benden wrote:
> I have a bunch of predicates which work fine under version 1.2.1 of
GNU-Prolog, but under 1.2.8 or
> 1.2.9 they always seg. fault.
> This occurs on Linux as well as Windows.
> I have narrowed it down to the Pl_Err_System, and sometime unification
> What has changed????? Help!

Daniel Diaz   address@hidden
gprolog --version 2>&1 | sed -n -e 's/By //p'

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