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). 

ARGUMENTS

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. 

EXAMPLE

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 5.5/SPARC  —  Last change: 11 Apr 1991