[Jack-Devel] libjack.so and libjackserver.so bug

Christoph Kuhr christoph.kuhr at web.de
Tue Mar 6 10:27:45 CET 2018


Why is it not documented somewhere?

I have both libraries working now. Just by linking against jack first 
and afterwards against libjackserver.



On 03/06/2018 10:14 AM, Filipe Coelho wrote:
> This is a known scenario.
>
> Those 2 libs share some code, but in a different way.
> A client application is never supposed to control the server.
>
> Do not link against the 2 libraries from within the same application, 
> and you'll be fine.
>
>
> On 06.03.2018 09:04, Christoph Kuhr wrote:
>> Hi *,
>>
>> I observed some strange behavior of libjack and libjackserver.
>>
>> If I have a multiprocessing application with one jack server fork and 
>> one jack client fork, jack_client_open crashs.
>>
>> Here the backtrace:
>> #0  __strcmp_ssse3 () at ../sysdeps/x86_64/multiarch/../strcmp.S:174
>> #1  0x00007f83dddb803f in jack_find_driver_descriptor(_JSList*, char 
>> const*) () from /usr/local/lib/libjackserver.so.0
>> #2  0x00007f83dddb9ef8 in Jack::JackServerGlobals::Init() () from 
>> /usr/local/lib/libjackserver.so.0
>> #3  0x00007f83dddb64f8 in jack_client_open_aux(char const*, 
>> JackOptions, JackStatus*, __va_list_tag*) () from 
>> /usr/local/lib/libjackserver.so.0
>> #4  0x00007f83dddb67b1 in jack_client_open () from 
>> /usr/local/lib/libjackserver.so.0
>> #5  0x0000000000414f04 in talker_Process (arguments=0x63f680 
>> <arguments>) at ../src/net/avb/talker/talker_process.c:395
>> #6  0x000000000042d487 in avbruntime (arguments=0x63f680 <arguments>) 
>> at ../src/avbruntime.c:644
>> #7  0x000000000042e888 in main (argc=11, argv=0x7ffebee6f678) at 
>> ../src/main.c:144
>>
>>
>> The interesting thing is, jack_client_open keeps crashing if I remove 
>> all the jack server code.
>>
>> It was neccessary to remove the -ljackserver linker option as well, 
>> because the client code linked against libjackserver.so instead of 
>> libjack.so.
>>
>> This means it is not possible to have a jack server and a jack client 
>> in a single multiprocessing application.
>>
>>
>> BR,
>> Ck
>> _______________________________________________
>> Jack-Devel mailing list
>> Jack-Devel at lists.jackaudio.org
>> http://lists.jackaudio.org/listinfo.cgi/jack-devel-jackaudio.org
>
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