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

[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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