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DEVFS(5)		  FreeBSD File Formats Manual		      DEVFS(5)

NAME
     devfs -- device file system

SYNOPSIS
     devfs   /dev    devfs rw 0	0

DESCRIPTION
     The device	file system, or	devfs, provides	access to kernel's device
     namespace in the global file system namespace.  The conventional mount
     point is /dev.

     The file system includes several directories, links, symbolic links and
     devices, some of which can	also be	written.  In a chroot'ed environment,
     devfs can be used to create a new /dev mount point.

     The mknod(8) tool can be used to recover deleted device entries under
     devfs.

     The fdescfs(5) filesystem is an alternate means for populating /dev/fd.
     The character devices that	both devfs and fdescfs(5) present in /dev/fd
     correspond	to the open file descriptors of	the process accessing the
     directory.	 devfs only creates files for the standard file	descriptors 0,
     1 and 2.  fdescfs(5) creates files	for all	open descriptors.

     The options are as	follows:

     -o	options
	     Use the specified mount options, as described in mount(8).	 The
	     following devfs file system-specific options are available:

	     ruleset=ruleset
		     Set ruleset number	ruleset	as the current ruleset for the
		     mount-point and apply all its rules.  If the ruleset num-
		     ber ruleset does not exist, an empty ruleset with the
		     number ruleset is created.	 See devfs(8) for more infor-
		     mation on working with devfs rulesets.

FILES
     /dev	The normal devfs mount point.

EXAMPLES
     To	mount a	devfs volume located on	/mychroot/dev:

	   mount -t devfs devfs	/mychroot/dev

SEE ALSO
     fdescfs(5), devfs(8), mount(8)

HISTORY
     The devfs file system first appeared in FreeBSD 2.0.  It became the pre-
     ferred method for accessing devices in FreeBSD 5.0	and the	only method in
     FreeBSD 6.0.  The devfs manual page first appeared	in FreeBSD 2.2.

AUTHORS
     The devfs manual page was written by Mike Pritchard <mpp@FreeBSD.org>.

FreeBSD	9.3		       February	9, 2012			   FreeBSD 9.3

NAME | SYNOPSIS | DESCRIPTION | FILES | EXAMPLES | SEE ALSO | HISTORY | AUTHORS

Want to link to this manual page? Use this URL:
<http://www.freebsd.org/cgi/man.cgi?query=devfs&sektion=5&manpath=FreeBSD+10.0-RELEASE>

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