getaddrinfo - Error: libc suspend() called from non-user context (0x117549a) - aborting

[Johannes Kliemann]

Hi Emery,

thanks for your help. That was indeed what I was missing!

Regards,
Johannes

Am 07.02.2018 um 11:58 schrieb Emery Hemingway:
> Hello Johannes,
> 
> The message "libc suspend() called from non-user context" indicates
> that you are using POSIX I/O from the initial Libc::Component 'kernel'
> context, and not the 'user' context. To switch to a user context,
> supply user level code as a lambda to the 'Libc::with_libc(...)'
> function. Looking at your code I see that this would likly just be a
> lamba to wrap the construction of Sntp::Main and a lambda of the body
> of the Rtc::current_time() RPC method. One example of with_libc in
> user can be found in genode/repos/gems/src/server/tcp_terminal/main.cc.
> 
> Cheers,
> Emery
> 
> 
> On Tue, 6 Feb 2018 23:19:16 +0100
> Johannes Kliemann <kliemann at ...543...> wrote:
> 
>> Hi all,
>>
>> when I use the lwip networking I sometimes get the following error:
>>
>>> Error: libc suspend() called from non-user context (0x117549a) -
>>> aborting  
>>
>> I have tracked it down to a call of getaddrinfo yet I could not  find
>> out when exactly and why this happens. It occurs at ca. 50% of the
>> tries. Does anyone have an idea how to fix that?
>>
>> Also is there a way to check if an IP is available? Sleeping a few
>> seconds and hoping that DHCP assigned an address does not seem a
>> reliable solution to me.
>>
>> The full code is available at [1], [2] and [3] while the error happens
>> in [3] at line 24.
>> To test it yourself, check out [4] and run `make run/sntp`.
>>
>> Regards,
>> Johannes
>>
>> [1]:
>> https://github.com/jklmnn/genode-world/blob/sntp/src/server/sntp/main.cc
>> [2]:
>> https://github.com/jklmnn/genode-world/blob/sntp/src/server/sntp/client.h
>> [3]:
>> https://github.com/jklmnn/genode-world/blob/sntp/src/server/sntp/client.cc
>> [4]: https://github.com/jklmnn/genode-world/tree/sntp/src/server/sntp
>>
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> 
> 
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