Skip site navigation (1)Skip section navigation (2)

FreeBSD Manual Pages


home | help
DEVFS.CONF(5)		    BSD	File Formats Manual		 DEVFS.CONF(5)

     devfs.conf	-- boot-time devfs configuration information

     The devfs.conf file provides an easy way to set ownership and permis-
     sions, or create links for	devices	available at boot.

     It	does not work for devices plugged in and out after the system is up
     and running, e.g. USB devices.  See devfs.rules(5)	for setting ownership
     and permissions for all device nodes, and usbd.conf(5) for	actions	to be
     taken when	USB devices are	attached or detached.

     Lines starting with a hash	sign (`#') and empty lines are ignored.	 The
     lines that	specify	devfs.conf rules consist of three parameters separated
     by	whitespace:

     action  The action	to take	for the	device.	 The action names are only
	     significant to the	first unique character.

	     The name of the device created by devfs(5).

     arg     The argument of the action.

     The actions currently supported are:

     link    This action creates a symbolic link named arg that	points to
	     devname, the name of the device created by	devfs(5).

     own     This action changes the ownership of devname.  The	arg parameter
	     must be in	the form of an owner:group pair, in the	same format
	     used by chown(8).

     perm    This action changes the permissions of devname.  The arg parame-
	     ter must be a mode	as explained in	chmod(1).


     To	create a /dev/cdrom link that points to	the first SCSI(4) or
     atapicam(4) CD-ROM, the following may be added to devfs.conf:

	   link	   cd0	   cdrom

     Similarly,	to link	/dev/cdrom to the first	ATAPI CD-ROM device, the fol-
     lowing action may be used:

	   link	   acd0	   cdrom

     To	set the	owner of a device, the own action may be specified:

	   own	   cd0	   root:cdrom

     To	set the	permissions of a device, a perm	action should be used:

	   perm	   cd0	   0660

     chmod(1), devfs(5), devfs.rules(5), usbd.conf(5), chown(8)

     This manual page was written by Roland Smith <>.

BSD				 May 17, 2005				   BSD


Want to link to this manual page? Use this URL:

home | help