getmajor(9f) [linux man page]

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)

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)