Re: [xml] xmlFree() segmentation fault with dinamic library

[Daniel Veillard <veillard redhat com>]

On Wed, May 11, 2005 at 06:59:31PM +0200, SOM3ONE wrote:
> here is the code examle i was using to test the problem:

  Step 1/ clean up the shared lib crap and fall back to clean C

paphio:~/XML -> cat tst.c
#include <stdio.h>
#include "libxml/xmlmemory.h"
#include "libxml/parser.h"

int
main(int argc, char **argv)
{

    xmlDocPtr doc;
    xmlNodePtr cur;
    xmlChar *attr;

    doc = xmlParseFile("test.xml");
    if (doc == 0) {
        printf("xmlParseFile error\n");
        return 1;
    }

    cur = xmlDocGetRootElement(doc);
    if (cur == 0) {
        printf("xmlDocGetRootElement error\n");
        xmlFreeDoc(doc);
        return 1;
    }

    if (xmlStrcmp(cur->name, (const xmlChar *) "OSDaB_XML")) {
        printf("invalid root\n");
        xmlFreeDoc(doc);
        return 1;
    }

    attr = xmlGetProp(cur, (const xmlChar *) "version");
    if (attr != 0) {
        printf("version: %s\n", attr);
        xmlFree(attr);
    }

    return 0;
}

paphio:~/XML ->

  Step 2/ compile in a clean way against the installed shared librairies

paphio:~/XML -> gcc -Wall  -o tst `xml2-config --cflags` tst.c `xml2-config --libs`
paphio:~/XML ->

  Step 3/ check the shared libraries

paphio:~/XML -> ldd tst
        libxml2.so.2 => /usr/lib/libxml2.so.2 (0x007b7000)
        libz.so.1 => /usr/lib/libz.so.1 (0x009bc000)
        libm.so.6 => /lib/tls/libm.so.6 (0x0018b000)
        libc.so.6 => /lib/tls/libc.so.6 (0x00b03000)
        libdl.so.2 => /lib/libdl.so.2 (0x0044f000)
        /lib/ld-linux.so.2 (0x00717000)
paphio:~/XML ->

  Step 4/ verify it works

paphio:~/XML -> ./tst
version: 1.0
paphio:~/XML ->

> I really can't realize where the problem could be!
> the xml test file is parsed correctly by other xml parsers (like the one
> used by Trolltech's Qt toolkit).

   libxml2 parses it correctly too of course, no problem. Now something
is screwed in the way you use the C++ or the dynamic shared library loading
but this has positively nothing to do with libxml2 as I just demonstrated.

Daniel

-- 
Daniel Veillard      | Red Hat Desktop team http://redhat.com/
veillard redhat com  | libxml GNOME XML XSLT toolkit  http://xmlsoft.org/
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