Re: [Cooker] Major Exception bug in g++-3.0.3 not in 3.0.2

[Mark Swanson]

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On January 4, 2002 05:09 pm, Mark Swanson wrote:

> Since this requires Tux to test, how would you like me to help resolve
> this?

OK. I have isolated the problem and wrote code to show this happening without 
Tux involvement. The code below works on 3.0.2 but not 3.0.3 OR 3.1 beta even 
with the latest binutils.

Running ./bugLoad will show (aborted), but on 3.0.2 it works.

Hopefully this small example is all you need.
Let me know if I can do anything to help.


# Make targets
bugLoad: bugLoad.c BugLib.tux.so
    ${GCC} -rdynamic -ldl bugLoad.c -o bugLoad

BugLib.o: BugLib.cpp
    ${CC} ${RELEASE_CPPFLAGS} -c BugLib.cpp

BugLib.tux.so: BugLib.o
    ${CC} ${LINK} -O2 -Wall -D_REENTRANT -shared -o $@ BugLib.o -lstdc++ 
- -lgcc_s
    chmod a-x $@

*** bugLoad.c dynamic load harness ****
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <signal.h>
#include <sys/wait.h>
#include <linux/unistd.h>
#include <unistd.h>
#include <string.h>
#include <pwd.h>
#include <grp.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <regex.h>
#include <fcntl.h>
#include <time.h>
#include <sys/mman.h>
#include <dlfcn.h>
#include <popt.h>
#include <sys/socket.h>
#include <ctype.h>
//#include <glib.h>


int main(int argc, char** argv) {
    void* handle;
    void (*mod_init) (void);
    char libname[] = "./BugLib.tux.so";

    handle = dlopen (libname, RTLD_LAZY);
    printf ("handle: %p\n", handle);
    if (!handle) {
        printf("%s: dlopen() handle missing", dlerror());
    }
    mod_init = dlsym(handle, "TUXAPI_init");
    if (!mod_init) {
        printf("%s: TUXAPI_init() function missing", strerror(errno));
    }

    printf ("TUXAPI_init: %p\n", mod_init);
    if(mod_init)
        mod_init();

}


******* BugLib.cpp (shows the bug) *******
//
// $Id: TuxModule.cpp,v 1.5 2002/01/04 21:19:15 mswanson Exp $
//

extern "C" {
    #include "tuxmodule.h"
    void TUXAPI_init();
    int TUXAPI_handle_events (user_req_t *req);
}

#include "syslog.h"
#include "TestException.h"

int TUXAPI_handle_events (user_req_t *req) {
    return TUX_RETURN_USERSPACE_REQUEST;
}
//TUXAPI_handle_events

// 1. open syslog
// 2.
void TUXAPI_init() {

    openlog("BugLib", LOG_PID | LOG_CONS | LOG_NDELAY, LOG_DAEMON);

    syslog(LOG_INFO, "TUXAPI_init()");

    try {
        throw TestException("test123");
        return;
    } catch(TestException e) {
        // This never happens
        syslog(LOG_INFO, "Success");
    }

}

******* TestException.h ***********

#ifndef _EXCEPTION_H
#define _EXCEPTION_H

#include <string.h>

class TestException {
protected:
        char msg[1024];

public:
        TestException(const char *errorMessage) {
                strcpy(msg, errorMessage);
        }

};

#endif
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