Fix pidfile_test on MIPS

[br]

Summary

switch to kqueue to ensure we will not loose SIGINT sent by parent to child

[adrian]

Hm, why's mips@ subscribed? this looks fine?

[ngie]

lib/libutil/tests/pidfile_test.c

172

What was the exact error occurring here before? Did you ever trace that down?

Also, I wish that the return code from select(2) had been checked previously...

173

Ensure kq != -1.

177

Print out an error message with err or use a different exit code...?

183

Print out an error message with err or use a different exit code...?

[br]

lib/libutil/tests/pidfile_test.c

172

there is no error, but scheduler do a thread switch just after write(fd[1],...) and before select(), so child process miss signal and never dies (waits forever in select())

[ngie]

Please address my feedback.

lib/libutil/tests/pidfile_test.c

172

Ok.

[sbruno]

I'm good with the current revision as the exit() values are now unique for the test.

[ngie]

Please commit -- thank you!