(Sorry, resending as e-mail was accidently not sent to the list)
Hello Ryan,
Few of my quick thoughts...
...
What I want to know:
- are LSPs the only reason that I can't use CloseHandle and
DuplicateHandle on
socket handles (ie: if there are no LSPs around, will everything be
OK)?
I don't think so. Saw this thread with this quick search:
http://microsoft.public.win32.programmer.networks.narkive.com/EoNck2gO/does-closesocket-call-closehandle-internally.
The MSDN documentation explicitly states that one should not use
CloseHandle/DuplicateHandle on sockets, due to internal resource
management issues.
https://msdn.microsoft.com/en-us/library/windows/desktop/ms724211%28v=vs.85%29.aspx
https://msdn.microsoft.com/en-us/library/windows/desktop/ms724251%28v=vs.85%29.aspx
- how common are LSPs in practice?
They could be used in parental control programs (it is done as a LSP
Vista's and 7's parental controls) and anti-virus/anti-malware programs
as well, such as in older Avira and Sophos, so could be widespread.
https://msdn.microsoft.com/en-us/library/windows/desktop/ms711710%28v=vs.85%29.aspx
For the last 2 questions, need to look further, but this is what I can
find out at this point.
With blessings.
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