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Kernel Functions for Driversgetmajor(9F)

NAME

 getmajor - get major device number

SYNOPSIS

  
#include <sys/types.h>
#include <sys/mkdev.h>
#include <sys/ddi.h>
major_t getmajor(dev_t dev);

INTERFACE LEVEL

 

Architecture independent level 1 (DDI/DKI).

PARAMETERS

 
dev
Device number.

DESCRIPTION

 

getmajor() extracts the major number from a device number.

RETURN VALUES

 

The major number.

CONTEXT

 

getmajor() can be called from user or interrupt context.

EXAMPLES

 Example 1. Using getmajor
 

The following example shows both the getmajor() and getminor(9F) functions used in a debug cmn_err(9F) statement to return the major and minor numbers for the device supported by the driver.

  
dev_t dev; 

#ifdef DEBUG  
cmn_err(CE_NOTE,"Driver Started.  Major# = %d, 	
     Minor# = %d", getmajor(dev), getminor(dev)); 
#endif

SEE ALSO

 

cmn_err(9F), getminor(9F), makedevice(9F)

Writing Device Drivers

WARNINGS

 

No validity checking is performed. If dev is invalid, an invalid number is returned.
SunOS 5.9Go To TopLast Changed 11 Apr 1991
 
      
      
Copyright 2002 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.