res_major(4)                                            res_major(4)


       NAME
             res_major - reserved major numbers for base system device
             drivers

       SYNOPSIS
             res_major

       DESCRIPTION
             One of the Installable Driver/Tunable Parameters kernel
             configuration files, the res_major file defines the major
             numbers that are reserved for use by device drivers supplied
             with the base system.  When the idinstall(1M) command
             allocates major numbers for an add-on driver, it examines the
             contents of the file /etc/conf/cf.d/res_major to make sure the
             major number it intends to allocate to the add-on driver is
             not already reserved for allocation to a base system driver.
             This file should not be used by add-on drivers.

             Any base system driver that sets a k (keep majors) flag in the
             characteristics field of its Master(4) file must add its major
             numbers to the res_major file.  Each res_major file entry
             provides information about one type of base system driver,
             specified on a line of the form:
             device-type major-number module-name

             All fields are positional and must be separated by tabs.

             The res_major file fields are:

             device-type
                       Identifies the type of base system device driver.
                       The character b indicates that the driver is a block
                       device driver; the character c indicates that the
                       driver is a character device driver.  If the driver
                       is both a block device driver and a character device
                       driver, the driver must define two separate
                       res_major entries, with one entry for each device
                       type.

             major-number
                       Specifies the major number(s) reserved by the base
                       system device driver.  If the device has multiple
                       major numbers, this field should be specified as two
                       numbers separated by a dash to indicate an inclusive
                       range of reserved values.  The value for this field
                       must match the value specified in the bmaj or cmaj


                           Copyright 1994 Novell, Inc.               Page 1

      res_major(4)                                            res_major(4)


                      field in the driver's Master file.

            module-name
                      Identifies the base system device driver for which
                      the major number(s) are reserved.  The name must
                      match the name specified for the driver in the
                      module-name field of the Master file.

      REFERENCES
            idinstall(1M), Master(4)






































                          Copyright 1994 Novell, Inc.               Page 2