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
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@...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
Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ genode-main mailing list genode-main@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/genode-main
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@...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
Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ genode-main mailing list genode-main@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/genode-main
Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot
genode-main mailing list genode-main@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/genode-main
-
Emery Hemingway -
Johannes Kliemann