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devfs(5) [freebsd man page]

DEVFS(5)						      BSD File Formats Manual							  DEVFS(5)

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 environ- ment, 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 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. 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 preferred 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 <>. BSD
February 9, 2012 BSD

Check Out this Related Man Page

devfs(7FS)                                                         File Systems                                                         devfs(7FS)

devfs - Devices file system DESCRIPTION
The devfs filesystem manages a name space of all devices under the Solaris operating environment and is mounted during boot on the /devices name space. The /devices name space is dynamic and reflects the current state of accessible devices under the Solaris operating environment. The names of all attached device instances are present under /devices. The content under /devices is under the exclusive control of the devfs filesystem and cannot be changed. The system may be configured to include a device in one of two ways: By means of dynamic reconfiguration (DR), using, for example, cfgadm(1M). For devices driven by driver.conf(4) enumeration, edit the driver.conf file to add a new entry, then use update_drv(1M) to cause the system to re-read the driver.conf file and thereby enumerate the instance. The device may be attached through a number of system calls and programs, including open(2), stat(2) and ls(1). During device attach, the device driver typically creates minor nodes corresponding to the device via ddi_create_minor_node(9F). If the attach is successful, one or more minor nodes referring to the device are created under /devices. Operations like mknod(2), mkdir(2) and creat(2) are not supported in /devices. FILES
/devices Mount point for devfs file system SEE ALSO
devfsadm(1M), vfstab(4), attach(9E) NOTES
The /devices name space cannot be unmounted. All content at or below the /devices name space is an implementation artifact and subject to incompatible change or removal without notifi- cation. SunOS 5.10 26 Oct 2004 devfs(7FS)

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