initial freebsd support

[wfurt]

related to #606. This is initial support without packaging or documentation.
With this change it is possible build and run omiserver and use cli.

I'm able to run all tests.

./regress
 
##===================##
##                                            ##
## ALL TESTS PASSED!        ##
##                                            ##
##===================##
 

and this on my Azure machine

root@toweinfu-fbsd:/opt/omi-1.6.0 # sudo /opt/omi/bin/omicli ei root/omi OMI_Identify
instance of OMI_Identify
{
    [Key] InstanceID=2FDB5542-5896-45D5-9BE9-DC04430AAABE
    SystemName=toweinfu-fbsd
    ProductName=OMI
    ProductVendor=Microsoft
    ProductVersionMajor=1
    ProductVersionMinor=6
    ProductVersionRevision=0
    ProductVersionString=1.6.0-121
    Platform=FREEBSD_X86_64_GNU
    OperatingSystem=FREEBSD
    Architecture=X86_64
    Compiler=GNU
    ConfigPrefix=GNU
    ConfigLibDir=/opt/omi-1.6.0/lib
    ConfigBinDir=/opt/omi-1.6.0/bin
    ConfigIncludeDir=/opt/omi-1.6.0/include
    ConfigDataDir=/opt/omi-1.6.0/share
    ConfigLocalStateDir=/opt/omi-1.6.0/var
    ConfigSysConfDir=/opt/omi-1.6.0/etc
    ConfigProviderDir=/opt/omi-1.6.0/etc
    ConfigLogFile=/opt/omi-1.6.0/var/log/omiserver.log
    ConfigPIDFile=/opt/omi-1.6.0/var/run/omiserver.pid
    ConfigRegisterDir=/opt/omi-1.6.0/etc/omiregister
    ConfigSchemaDir=/opt/omi-1.6.0/share/omischema
    ConfigNameSpaces={interop, root-cimv2, root-omi, root-check}
}

[palladia]

Please do not merge until given ok by Saroj or Ashok.

[wfurt]

no, I won't @palladia. I don't have permissions. Who would be good person to talk to make this more polished? e.g. fix packaging and documentation. I tried to look around but I want to make sure it would meet expectation.

[JumpingYang001]

where is now use?

[wfurt]

look at CPU_GetLocalTimestampz() @JumpingYang001. On Linux, timezone is extern long with offset to GMT. BSD does not have that. (or OSX/MacOS) Since I failed to figure out what we do for Mac, I simply calculate once difference between GMT and local.

[JumpingYang001]

yeah, I found there is a char* timezone() function in FreeBSD.

I think OSX should use exist logic, I don't know much about how BSD dealt with it.
I just surprise the now variable here isn't used?
:)

[wfurt]

good catch. there were two lines missing - I probably somehow nuke them in final cleanup. I also add more comments. I hope the code makes more sense now.

[JumpingYang001]

In fact, we don't have verification for u.timestamp.utc in https://github.com/Microsoft/omi/blob/eb689db8a63de6e466f149cd80136de26c53b40c/Unix/tests/pal/test_pal.cpp#L1021 , if you can add one that would be nice, e.g. TEST_ASSERT(now.u.timestamp.utc>= "2018/12/12 00:00AM UTC"'s utc);, just an example that means it will be greater than a recent past utc time.

[JumpingYang001]

I am not sure if my condition is good, just a thought. :)

[JumpingYang001]

@wfurt Saroj seems be in vacation today and tomorrow, he might be back next week, let's wait his comments, thanks.