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Full Discussion: major & minor number
Operating Systems Solaris major & minor number Post 53630 by Perderabo on Wednesday 21st of July 2004 06:45:41 AM
Old 07-21-2004
There are several different drivers in a system. For example if your system has a disk drive and tape drive, there would be one driver for the disk and another driver for the tape drive. Each driver gets a number called the major number. The major number just tells the kernel which driver to use.

The minor number is passed to the driver. The driver could ignore it. Or the driver can interpret any way it wants. Usually there are sub fields in the minor number. In the case of a tape driver, one sub field would say which particular tape drive to use. Another sub field might say whether or not to automatically rewind the tape when the file is closed.
 

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LEARN ABOUT ULTRIX

tms

tms(4)							     Kernel Interfaces Manual							    tms(4)

Name
       tms - TMSCP magnetic tape interface

Syntax
       For UNIBUS, Q-bus:
	  controller klesiu0 at uba0
	  controller uq0 at klesiu0 csr 0174500 vector uqintr
	  tape tms0 at uq0 drive 0

       For MSI Bus:
	  adapter msi0 at nexus?
	  controller dssc0 at msi0 msinode 0
	  tape tms0 at dssc0 drive 3

       For VAXBI:
	  controller klesib0 at vaxbi0 node 0
	  controller uq0 at klesib0 vector uqintr
	  tape tms0 at uq0 drive 0

	  controller aie0 at vaxbi? node?
	  controller bvpssp0 at aie0 vector bvpsspintr
	  tape tms0 at bvpssp0 drive 0

       For MSI Bus:
	  adapter msi0 at nexus?
	  controller dssc0 at msi0 msinode 0
	  tape tms0 at dssc0 drive 0

       For VAX CI/HSC:
	  adapter ci0 at nexus?
	  adapter ci0 at vaxbi? node?
	  controller hsc0 at ci0 cinode 6
	  tape tms0 at hsc0 drive 3

Description
       Prior to Version 2.0, this device was referenced by tmscp(4).

       The  TMSCP  driver  provides  a standard tape drive interface, as described in This is a driver for any controller that adheres to the Tape
       Mass Storage Control Protocol (TMSCP).  The TMSCP controllers communicate with the host through a packet-oriented protocol termed the  Tape
       Mass  Storage  Control Protocol.  This driver also supports n-buffered reads and writes to the raw tape interface (used with streaming tape
       drives).  See for further details.

Tape Support
       TK50, TK70, TF70, TU81, TU81e, TA78, TA79, TA81, RV20, TA90, TA90E, TA91

Diagnostics
       All diagnostic messages are sent to the error logger subsystem.

Files
See Also
       mtio(4), nbuf(4), MAKEDEV(8), uerf(8), tapex(8)
       Guide to the Error Logger

																	    tms(4)
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