From owner-freebsd-hackers@FreeBSD.ORG  Tue Jan  3 12:47:28 2006
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From: TSaplin Mikhail <tsmm@list.ru>
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Date: Tue, 3 Jan 2006 18:47:22 +0600
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Subject: devfs
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Hi all i have a problem with devfs device hiding.
My system is FreeBSD 6.0 (i386 and amd64, compiled from last sunday source 
(RELENG_6))

After mounting defs:
#mount -t devfs devfs /tmp/proba

first devfs command:
# devfs -m /tmp/proba rule add type disk hide
devfs rule: ioctl DEVFSIO_RADD: Input/output error

the second command hangs:
# devfs -m /tmp/proba rule add type disk hide

command doesnt responds on HUP and TERM signals