users February 2018

users@lists.genode.org

22 participants
26 discussions

nitpicker focus
by Boris Mulder 09 Feb '18

09 Feb '18

Hi all, I'm writing a scenario with nitpicker where I want to support pop-ups e.g. for asking the user's password. I made a simple GUI app with a textbox that pops up and disappears when required. However, whenever this popup appears I want nitpicker to immediately change focus to this popup and put it in front of all other nitpicker clients and windows. Now the behaviour is either "click", "transient" or "none", meaning the focus is only given when the user clicks on the window, or never. This is a problem since if some other untrusted app is running in the background, the user could type in his password immediately when the pop-up appears, and the input is then directed to the app instead of the popup itself, allowing the untrusted app to read the password. The only way the user could enter the password correctly at the moment is by clicking on the pop-up before typing. One solution would be handling the focus via a focus report-rom, however when the pop-up is not there I want nitpicker to use its default behaviour (together with the window manager) so that it focuses windows when they are clicked. Reimplementing this default behaviour so it produces the report in this case seems quite ugly. Do you have any ideas what I could try to do to achieve the desired behaviour? From nitpicker's readme: > The focus ROM is expected to have a 'label' attribute with the value set to the label of the to-be focused client. When using an external focus policy, domains configured as "click" are internally handled like "transient" focusable domains. It is up to the external focus policy component to make a new focus permanent by providing an updated "focus" ROM." What if I want to switch between an external and internal focus policy based on which apps are running? Do you think it is easiest to extend nitpicker to have a focus="always" attribute that always focuses a certain client whenever it is up? Or to write a separate complicated focus policy component responsible for all focusing? -- Met vriendelijke groet / kind regards, Boris Mulder Cyber Security Labs B.V. | Gooimeer 6-31 | 1411 DD Naarden | The Netherlands +31 35 631 3253 (office)

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qt5 build problem
by Robert Sutherland 09 Feb '18

09 Feb '18

Hello I have some problems with the qt5 build.Â The first being a sha1sum issue with qtscriptclassic-1.0_1-opensource.Â The initial build gives: qt5Â extract qtwebkit-opensource-src-5.8.0.tar.xz (qtwebkit-opensource-src-5.8.0) Error: Hash sum check for qtscriptclassic-1.0_1-opensource failed make[2]: *** [qtscriptclassic-1.0_1-opensource.file] Error 1 make[1]: *** [_install_in_port_dir] Error 2 make: *** [qt5] Error 2 I ran the sha1sum program on all of the remote archives for *.gz and downloaded the file for *.gz as well, all of which failed. Since a decision tree was included for differing compression formats I chose a *.zip file I could find and ran the sha1sum program to change the verification sum, and then modified the ./repos/libports/ports/qt5.port file. # URL(${QTSCRIPTCLASSIC}) := ftp://ftp.informatik.hu-berlin.de/pub/Mirrors/ftp.troll.no/QT/qt/solutions/lgpl/${QTSCRIPTCLASSIC}.tar.gz # URL(${QTSCRIPTCLASSIC}) := ftp://ftp.pl.vim.org/vol/rzm4/qt.old/solutions/lgpl/${QTSCRIPTCLASSIC}.tar.… # URL(${QTSCRIPTCLASSIC}) := http://ftp.icm.edu.pl/packages/qt.old/solutions/lgpl/${QTSCRIPTCLASSIC}.tar… # URL(${QTSCRIPTCLASSIC}) := /home/rasuth/Downloads/${QTSCRIPTCLASSIC}.tar.gz # SHA(${QTSCRIPTCLASSIC}) := 74e9dc82dd194d8ae0fb0f8f1df74081948b943a URL(${QTSCRIPTCLASSIC}) := http://ftp.icm.edu.pl/packages/qt.old/solutions/lgpl/${QTSCRIPTCLASSIC}.zip SHA(${QTSCRIPTCLASSIC}) := de0d6b6ccbc8b06e4eb8a9eac36741b5d80153a3 DIR(${QTSCRIPTCLASSIC}) := src/lib/qt5/${QTSCRIPTCLASSIC} which appears to work.Â However, during the patch process it asks me for a file to patch.Â I think I understand the 'imaginary' diff --git nature (though this is new to me), but the port preparation then seem to require unexpected interaction. .Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â . qt5Â apply src/lib/qt5/patches/qtwebkit_genode.patch qt5Â apply src/lib/qt5/patches/qtscriptclassic_qt5.patch The text leading up to this was: -------------------------- |qtscriptclassic_qt5.patch | |From: Christian Prochaska <christian.prochaska@...1...> | | |--- | src/qscriptcontextinfo.cppÂ Â Â Â Â Â |Â Â Â 2 - | src/qscriptecmafunction.cppÂ Â Â Â Â |Â Â 12 ++++----- | src/qscriptengine_p.cppÂ Â Â Â Â Â Â Â Â |Â Â 30 ++++++++++++++-------- | src/qscriptextqobject.cppÂ Â Â Â Â Â Â |Â Â 52 +++++++++++++++++--------------------- | src/qscriptstring.cppÂ Â Â Â Â Â Â Â Â Â Â |Â Â Â 1 - | src/qscriptsyntaxcheckresult_p.h |Â Â Â 2 + | src/qscriptvalue.cppÂ Â Â Â Â Â Â Â Â Â Â Â |Â Â Â 4 +-- | src/qscriptvalue.hÂ Â Â Â Â Â Â Â Â Â Â Â Â Â |Â Â Â 4 +-- | src/qscriptvalue_p.hÂ Â Â Â Â Â Â Â Â Â Â Â |Â Â Â 1 - | src/qscriptvalueimpl_p.hÂ Â Â Â Â Â Â Â |Â Â Â 3 +- | 10 files changed, 55 insertions(+), 56 deletions(-) | |diff --git a/src/qscriptcontextinfo.cpp b/src/qscriptcontextinfo.cpp |index ef080ff..df0e555 100644 |--- a/src/qscriptcontextinfo.cpp |+++ b/src/qscriptcontextinfo.cpp -------------------------- File to patch: qtscriptclassic_qt5 qtscriptclassic_qt5: No such file or directory Skip this patch? [y] So did I mangle something when getting qtscriptclassic running? Or do I need to name a file?

4 10

Share a variable of Core with other components
by Jaemin Park 07 Feb '18

07 Feb '18

Hi, I'd like to ask a question about a way to "share a variable of Core with other components". I'm using i.MX53 QSB, so this question is based on 'base-hw' implementation. Suppose that 'Core' has a variable "A" and makes it visible to other components like 'Init' or else. For this, I added a routine to use a Dataspace_capability for "A" in main() of 'Core' as follows: *[repos/base/src/core/main.cc]* *Dataspace_capability ds = env()->ram_session()->alloc(4096);* *unsigned char *local_addr = env()->rm_session()->attach(ds);* However, I faced a difficulty to implement an RPC to delegate(share) the Dataspace_capability to other components. Is there any simple or proper way to share "A" of 'Core' with other components? If possible, please give me an example. Any comment comments would be highly appreciated. JaeminPark

3 7

getaddrinfo - Error: libc suspend() called from non-user context (0x117549a) - aborting
by Johannes Kliemann 07 Feb '18

07 Feb '18

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

2 2

FOSDEM 2018 presentations
by Norman Feske 07 Feb '18

07 Feb '18

Hello everyone, the recordings of the following Genode-related talks at FOSDEM 2018 are available now: * GPU resource multiplexing in component-based systems by Sebastian Sumpf https://fosdem.org/2018/schedule/event/microkernel_genode_gpu_multiplexing/ * Live sculpting a Genode-based operating system by Norman Feske https://fosdem.org/2018/schedule/event/microkernel_genode_live_sculpting/ * User-level networking on Genode by Martin Stein https://fosdem.org/2018/schedule/event/microkernel_genode_user_level_networ… I'd like to thank the FOSDEM organizers for the fantastic conference and especially Jakub Jermar who organized this year's microkernel devroom! Cheers Norman -- Dr.-Ing. Norman Feske Genode Labs https://www.genode-labs.com Â· https://genode.org Genode Labs GmbH Â· Amtsgericht Dresden Â· HRB 28424 Â· Sitz Dresden GeschÃ¤ftsfÃ¼hrer: Dr.-Ing. Norman Feske, Christian Helmuth

1 1

Regarding building NOVA kernel
by ROHIT JAISWAL cs16m053 05 Feb '18

05 Feb '18

Hi, I have tried to build NOVA kernel but I am getting error..... <genode-main(a)lists.sourceforge.net> spawn qemu-system-x86_64 -no-kvm -display sdl -cpu core2duo -serial mon:stdio -m 512 -cdrom var/run/demo.iso -cdrom var/run/demo.iso -cdrom var/run/demo.iso qemu-system-x86_64: -display sdl: SDL support is disabled Aborting, received EOF Log step failed, retry. Boot process failed 3 times in series. I give up! make: *** [run/demo] Error 255 I have tried to comment -display sdl in build.conf but i didn't get any output. Please provide solution. -- Regards, Rohit Jaiswal

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users February 2018