getmajor(9F)						   Kernel Functions for Drivers 					      getmajor(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 5.10							    11 Apr 1991 						      getmajor(9F)