Mark Johnston 2bd9826995 vfs: Permit unix sockets to be opened with O_PATH
As with FIFOs, a path descriptor for a unix socket cannot be used with
kevent().

In principle connectat(2) and bindat(2) could be modified to support an
AT_EMPTY_PATH-like mode which operates on the socket referenced by an
O_PATH fd referencing a unix socket.  That would eliminate the path
length limit imposed by sockaddr_un.

Update O_PATH tests.

Reviewed by:	kib
MFC after:	1 month
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D31970
2021-09-17 14:19:06 -04:00
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