Introduce test-program for ioctl(2) syscall

[aniketp]

Summary

This revision introduces the test-program for ioctl audit class which only contains
ioctl(2) as the audit event.

Test Plan

Execute make && make install from test/sys/audit.
Execute kyua test from /usr/tests/sys/audit. All testcases should succeed.

[asomers]

tests/sys/audit/ioctl.c

57 ↗

(On Diff #43969)

ioctl is superversatile. Does it audit the request too? If so, can you test for that in the regex?

61 ↗

(On Diff #43969)

This is probably not a good ioctl to test with, because it might flush the audit record of interest. How about something more harmless, like AUDITPIPE_GET_QLIMIT ?

[aniketp]

Verify the audit of hex(request) in the ioctl(2)'s audit record

@asomers I have opened a separate instance of /dev/auditpipe for the test-case, so it doesn't
matter what is flushed from this device instance, since it is not of our concern.
Also, I pondered initially about which request to use, I chose AUDITPIPE_FLUSH because
it is the simplest of all available options.

[asomers]

tests/sys/audit/ioctl.c

59 ↗

(On Diff #43987)

Pro tip: the "#" character tells printf(3) to use an "alternate form", which has different meanings depending on the type of conversion. For example, printf("%#x", 16) will print 0xa.

[aniketp]

• Update the format specifier to %#lx instead of 0x%x