~ $ uname -sr
NetBSD 10.1
~ $ cc -g -O -o demo demo.c
~ $ ./demo
Testing traditional signals: wait for 14, ignore 31, catch 30:
    ok: no interrupts during wait
    ok: successfully waited for signal 14
    ok: caught signal 30 during wait, as expected
Testing realtime signals: wait for 35, ignore 34, catch 33:
    ok: no interrupts during wait
    ok: successfully waited for signal 35
    ok: caught signal 33 during wait, as expected
~ $ ktrace ./demo
Testing traditional signals: wait for 14, ignore 31, catch 30:
    ok: no interrupts during wait
    ok: successfully waited for signal 14
    ok: caught signal 30 during wait, as expected
Testing realtime signals: wait for 35, ignore 34, catch 33:
    ok: no interrupts during wait
    ok: successfully waited for signal 35
    ok: caught signal 33 during wait, as expected
~ $ kdump > netbsd-10.1.trace