[Gambas-devel] System error... (42)

[Ron]

(gdb) l gbx_watch.c:504
499 something_done = TRUE;
500 }
501 else if (ret < 0)
502 {
503 if (errno != EINTR)
504 THROW_SYSTEM(errno, NULL);
505 something_done = TRUE;
506 }
507
508 if (EVENT_check_post())



2011/10/8 Ron <ron at ...572...>

> It took much longer than normal, but I got a hit...
>
> THROW system error from ?
>
> Program received signal SIGTRAP, Trace/breakpoint trap.
> THROW (code=42) at gb_error.c:285
> 285 va_start(args, code);
> (gdb) bt
> #0  THROW (code=42) at gb_error.c:285
> #1  0x00000000004053af in THROW_SYSTEM (err=0, path=0x0) at gb_error.c:325
> #2  0x000000000042b03e in do_loop (wait=0x0) at gbx_watch.c:504
> #3  0x000000000042b0a0 in WATCH_loop () at gbx_watch.c:530
> #4  0x000000000042ca1d in main (argc=1, argv=0x7fffffffe3b8) at gbx.c:352
> (gdb)
> (gdb) p DEBUG_get_position(EXEC_current.cp, EXEC_current.fp,
> EXEC_current.pc)
> $1 = 0x43e540 "?"
>
>
> Anything else I can get from this?
>
> Regards,
> Ron.
>
>
>
> 2011/10/5 Benoît Minisini <gambas at ...1...>
>
>> > Benoit,
>> >
>> > I got this just now after uncommenting the lines in gb_error.c:
>> >
>> > THROW system error from ?
>> > ERROR: #42: System error. Success
>> >
>> > Program exited with code 01.
>> > (gdb) bt
>> > No stack.
>> > (gdb)
>> >
>> > So clearly  DEBUG_get_current_position() returns only a ?
>> > And no backtrace/stack.
>> > What does this mean?
>> > What can we get for other info?
>> > Do we need to print debug info earlier in the code?
>> >
>> > It does this several times a day, so we should be able to get more info
>> > this time...
>> >
>> > To be clear, it's  the latest Gambas2 code on 64 bit ubuntu natty,
>> > DomotiGaServer is a command line project.
>> > The GUI project DomotiGa (which also has most of the DomotiGaServer code
>> in
>> > it), doesn't have this problem...
>> >
>> > Any pointers are welcome...
>> >
>> > Regards,
>> > Ron.
>> >
>>
>> You have to compile the interpreter with no optimizations, and put that in
>> the
>> THROW function:
>>
>>        if (code == E_SYSTEM)
>>        {
>>     fprintf(stderr, "THROW system error from %s\n",
>>            DEBUG_get_current_position());
>>           BREAKPOINT();
>>        }
>>
>> It's the same thing as the code you already uncommented, with the
>> 'BREAKPOINT()' macro added.
>>
>> Then you must run your program into gdb, and wait for the BREAKPOINT()
>> line to
>> be reached. Then gdb will stop that, and the 'bt' will be useful (which is
>> not, of course, when then program is terminated!)
>>
>> Regards,
>>
>> --
>> Benoît Minisini
>>
>
>
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