parse_line($string);This test echoes a description, then runs the udpgso binary, which prints one diagnostic line per internal case (some intentionally marked '(fail)', meaning that specific case is expected to reject the send) and a bare 'OK' once all of them behaved as expected, e.g.:
# ipv4 cmsg
# ipv4 tx:1 gso:0
# ipv4 tx:1473 gso:0 (fail)
# ...
# OKThe script uses 'set -o errexit' and never wraps the binary call, so any unexpected result aborts the script immediately; a bare 'OK' is only ever reached when the whole case succeeded. The '(fail)' tag is part of the diagnostic text, not a result, so lines starting with 'ipv4 tx:'/'ipv6 tx:' are not treated as a new description. Lines that do not match this format are returned unchanged.