getmajor man page on SmartOS

getmajor man page on SmartOS

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GETMAJOR(9F)							  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
       The getmajor() function extracts the major number from a device number.

RETURN VALUES
       The major number.

CONTEXT
       The  getmajor()	function can be called from user, interrupt, or kernel
       context.

EXAMPLES
       Example 1 Using getmajor()

       The following example shows both the getmajor() and getminor(9F)	 func‐
       tions  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.

				 Jan 16, 2006			  GETMAJOR(9F)

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