tl;dr process-running? would always return #f on OpenBSD and
NetBSD, and in the one-argument case it would always return #t
on DragonFly.
To get the process information from the process table on OpenBSD
and NetBSD, we need to pass 6 level names to sysctl instead of 4.
Passing the wrong number of level names to sysctl has caused it
to always fail, which in turn caused process-running? to always
return #f:
(process-running? 1) => #f
(process-running? (current-process-id)) => #f
and so on.
After the above fix, we also need to check the amount of data
actually filled in by sysctl. It appears that on OpenBSD, NetBSD
and DragonFly, if the requested process doesn't exist then sysctl
will return with a return value of 0 and just not actually fill in
the given structure. This caused process-running? to return #t
when no process with the given PID existed:
(process-running? -1) => #t
(process-running? <other nonexistent pid>) => #t
and so on.
I have tested on OpenBSD, NetBSD, DragonFly BSD and FreeBSD, and
process-running? now behaves as expected on all of them.
To get the repository path in Chicken 5, we not only have to require the
chicken.platform module, we also need to take the car of the result
since it now returns a list.
The method snow-chibi used to get the version of Chicken installed
doesn't work with Chicken 5. Adding "-R chicken.platform" would make it
work with Chicken 5, but then it wouldn't work with Chicken 4.
In both Chicken 4 & 5, however, csi has a -release option that will just
give the version number. So, I've changed the Chicken version detection
in snow-chibi to use this option.
Testing with...
./chibi-scheme tools/snow-chibi.scm implementations
...then seemed to work with both Chicken 4 & 5.
* Include util.h instead of pty.h on OpenBSD and NetBSD
* Include libutil.h instead of pty.h on FreeBSD and DragonFly BSD
* Include utmp.h only on non-BSD systems (FreeBSD does not have that
header and none of these BSDs require it)
Tested on all four of these BSDs.
When char-set, w/case, w/nocase, w/ascii or w/unicode is applied on a
<cset-sre>, only (cadr sre) is taken, the rest is ignored. Which is the
right thing to do only if (null? (cddr sre)). If there are more
arguments, error out instead of silently ignoring them.
