devfs(5) manual page

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(8) 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 number ruleset does not exist, an empty ruleset with the number ruleset is created. See devfs(8) for more information on working with devfs rulesets.

Manual Pages — DEVFS

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-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 number ruleset does not exist, an empty ruleset with the number ruleset is created. See devfs(8) for more information on working with devfs rulesets.