notes.md

Development notes

• Reboot with dbus

  • sudo busctl call org.freedesktop.systemd1 /org/freedesktop/systemd1 org.freedesktop.systemd1.Manager Reboot

• Restart systemd-networkd

  • busctl call org.freedesktop.systemd1 /org/freedesktop/systemd1/unit/systemd_2dnetworkd_2eservice org.freedesktop.systemd1.Unit Restart s "fail"

• setting capabilities for srd binary to create raw sockets (SOCK_RAW)

  • sudo setcap 'CAP_NET_RAW+eip' ./srd

Resources

• Dbus stuff: https://www.freedesktop.org/wiki/Software/systemd/dbus/

• example PKGBUILD: https://github.com/archlinux/svntogit-packages/tree/packages/openssh/trunk

• systemd sd bus api: http://0pointer.de/blog/the-new-sd-bus-api-of-systemd.html

VM (testing):

• mount shared folder: sudo mount -t vboxsf -o uid=$USER,gid=vboxsf Desktop /mnt/shared

• mount guest additions: mkdir /mnt/guest_additions sudo mount /dev/cdrom /mnt/guest_additions

• stopping when running with valgrind:

  • kill -SIGALRM 276436 (obtained with ps -aux | grep "srd")

• kill srd (send SIGALRM)

  • ps -aux | grep srd | grep -v "grep" | cut -f 5 -d ' ' | xargs kill -SIGALRM

• checking memory leaks:

  • valgrind --leak-check=full --show-leak-kinds=all --track-origins=yes ./srd

• flamegraph

  • ./srd &
  • sudo perf record -F 99 -g [SRD_PID]
  • perf script > out.perf
  • stackcollapse-perf.pl out.perf > perf.data_collapsed
  • flamegraph.pl perf.data_collapsed > out.svg