devfs.conf man page on FreeBSD

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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 devd.conf(5) for actions to be
     taken when 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), devd.conf(5), devfs(5), devfs.rules(5), chown(8)

     This manual page was written by Roland Smith ⟨⟩.

BSD				 May 17, 2005				   BSD

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