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

[Ron]

On 4-1-2011 15:24, Ron wrote:
> On 31-12-2010 14:40, Benoît Minisini wrote:
>>> Benoît,
>>>
>>> trying to debug this problem, but if I follow your instructions, I get
>>> this right away.. are you sure they are correct?
>>>
>>> on at ...218...:~/domotiga/DomotiGaServer$ gdb gbx2
>>> GNU gdb (GDB) 7.1-ubuntu
>>> Copyright (C) 2010 Free Software Foundation, Inc.
>>> License GPLv3+: GNU GPL version 3 or later
>>> <http://gnu.org/licenses/gpl.html>  This is free software: you are 
>>> free to
>>> change and redistribute it. There is NO WARRANTY, to the extent 
>>> permitted
>>> by law.  Type "show copying" and "show warranty" for details.
>>> This GDB was configured as "i486-linux-gnu".
>>> For bug reporting instructions, please see:
>>> <http://www.gnu.org/software/gdb/bugs/>...
>>> Reading symbols from /usr/local/bin/gbx2...done.
>>> (gdb) break THROW
>>> Breakpoint 1 at 0x804be2e: file gb_error.c, line 273.
>>> (gdb) run
>>> Starting program: /usr/local/bin/gbx2
>>> [Thread debugging using libthread_db enabled]
>>>
>>> Breakpoint 1, THROW (code=13) at gb_error.c:273
>>> 273    void THROW(int code, ...)
>>> (gdb) bt
>>> #0  THROW (code=13) at gb_error.c:273
>>> #1  0x08057162 in get_stream (value=0x807fad0, can_default=<value
>>> optimized out>) at gbx_subr_file.c:146
>>> #2  0x0805717c in SUBR_close () at gbx_subr_file.c:187
>>> #3  0x0806b0f3 in EXEC_loop () at gbx_exec_loop.c:476
>>> #4  0x0804f533 in EXEC_function_loop () at gbx_exec.c:703
>>> #5  0x0804f809 in EXEC_function_real () at gbx_exec.c:690
>>> #6  0x08061c29 in main (argc=134739048, argv=0xbffff544) at gbx.c:349
>>>
>>> I guess it stops at every error now, even known ones...
>>>
>>> Regards,
>>> Ron_2nd.
>>>
>> This is not your error (42). THROW is raised a lot of time, but you 
>> may not
>> see it because a TRY or a CATCH can intercept it, or because the 
>> interpreter
>> internally catches it.
>>
>> To catch only system errors. Add that to the THROW() function, in 
>> gb_error.c,
>> at line 278:
>>
>>     if (code == 42) BREAKPOINT();
>>
>> Compile and install again.
>>
>> Then run your program into gdb until it stops at that line.
>>
>> Once done, don't forget to remove that line, otherwise your program 
>> will stop
>> at that line even outside of the debugger.
>>
>> Regards,
>>
>>
>
> Ok this is funny.
>
> I ran my project for days in a row, to see if the system error #42 
> ever comes again.  After an uptime of 5 days I finally got one.
> But it didn't ran inside a gdb session ;-(
>
> I added the breakpoint line to gb_error.c like you described above, 
> started the project inside gdb and it occurred right away... lucky ;-)
>
> See attached gdb output.
> Hope you can find the bug with it, if not will get some more info.
> It has to do with a TCP socket _Ready event and getting some data, I 
> think, but I have several sockets.
> This code was running: 
> http://www.domotiga.nl/browser/tags/0.1.193/DomotiGaServer
>
> Regards,
> Ron_2nd.
>
> BTW: Is't a command line program running gb.qt on Ubuntu 10.04 32 bits 
> and Gambas2 rev 3346
>

Well it throws the error every time now, code=42 isn't that unknown it 
seems.. or there is something  wrong with above line inserted at line 278?

Removed it so it can run..

Regards,
Ron.