Exit codes and signals

This page documents the exit codes possibly returned by the Mavkit binaries, as well as the signals they handle.

Exit codes

The meaning of exit codes is presented in the following table. The action column indicates a recommended course of action.

exit code	meaning	action
0	the process exited successfully	nothing
1–125	something went unexpectedly	check output/log to see if you forgot an argument or some such
126	an exception was not handled	report a bug
127	the process received a signal (e.g., via Ctrl-C)	nothing
128	the process was about to exit successfully but an error occurred during exit	check output/logs, clean-up leftover files, open a bug report
129–253	like 1–125 and an error occurred during exit	check output/logs, clean-up leftover files, open a bug report
254	like 126 and an error and an error occurred during exit	check output/logs, clean-up leftover files, open a bug report
255	like 127 but an error and an error occurred during exit (e.g., kill -9)	check output/logs, clean-up leftover files

Signals

Upon receiving SIGINT (e.g., via Ctrl+C in an interactive session) or SIGTERM (e.g., via systemctl stop) the process will exit (with code 64 or 255, see details below). Note that sending the same signal a second time (after a one (1) second grace period) will terminate the process immediately, interrupting the normal clean-up functions of clean-up (in this case the exit code will be 255).