SYSCTL_INT(_kern, OID_AUTO, signosys, CTLFLAG_RWTUN, &kern_signosys, 0,

It might be more readable if we had a SV_SIGSYS that opted in to getting the signals that the FreeBSD ABIs set in their flags and then this would be SV_PROC_FLAG(p, SV_SIGSYS) != 0

static volatile?

Do you want another version of this test that adjusts the sysctl and then verifies there is no sigsys? Or perhaps you should fetch the sysctl and alter the expected test results based on its value?

I remember there is some atf knob to allow/disallow changing global system state during the test. It would be needed there.

In fact Dmitry has another version of the tests, that I hope he will incorporate into this draft after I commit my parts. D41979

I remember there is some atf knob to allow/disallow changing global system state during the test. It would be needed there.

Well, I don't know such knob,
my test stupidly returned the knob state to the default state because the kyua is ugly in that case, however that's enought in my POV

In fact Dmitry has another version of the tests, that I hope he will incorporate into this draft after I commit my parts. D41979

ok

<errno.h>, <stdbool.h> and <stdlib.h> seem redundant

Only stdlib.h, if tests written properly.

See tests/sys/kern/kern_descrip_test.c for an example. You need to set "allow_sysctl_side_effects" and presumably also "require.user".

Alternately, at the beginning of the test, check whether the sysctl is set, and skip the test if not. Since kern_signosys = 1 by default, this is probably sufficient.

See tests/sys/kern/kern_descrip_test.c for an example. You need to set "allow_sysctl_side_effects" and presumably also "require.user".

Alternately, at the beginning of the test, check whether the sysctl is set, and skip the test if not. Since kern_signosys = 1 by default, this is probably sufficient.

Thank you, D41979 updated