freebsd-src/tools/regression/poll
..
4
7
14
l
m
n
Makefile
pipepoll.c
pipeselect.c
Readme
sockpoll.c

The directory contains poll(2) and select(2) compliance (and more) tests
from Bruce Evans, together with canned test results from several systems
for reference.

Citing Bruce Evans:
The subdirectories contain results of old runs:

{4,7}: FreeBSD-{4,7} with old tests (only state 0 and 6b have different
expectations; state 0 fails in FreeBSD-4 so the above is wrong
about at least when it was broken.  I thought that I fixed it
completely for select() in FreeBSD-1.  One or both of these states
were very broken in Net/2 and maybe in 4.4BSD-Lite*).

l: Linux-2.6.10 with old tests (only state 0 has different expectations)
m: my current version of FreeBSD with old tests (0 and 6b)
n: my previous version of FreeBSD with old tests (0 and 6b)