Implemented PipeSecurity. GetAccessControl, SetAccessControl, and ACL-containing constructor overrides now work on pipes.
On another note, after writing a test I discovered Asynchronous pipes appear to be completely broken on Win32.
The class does not correctly handle overlapped I/O. This patch doesn't fix that.
One other fix in this patch, the DllImports for Win32 pipes did not have SetLastError set.
So, they were unable to return a meaningful error in the event of failure. This is now fixed, and
UnauthorizedAccessException correctly throws for pipe connects denied by ACL (necessary for PipeSecurity test).
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