Content-type: text/html Man page of getmajor

getmajor

Section: Kernel Functions for Drivers (9F)
Updated: 16 Jan 2006
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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) 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.


 

Index

NAME
SYNOPSIS
INTERFACE LEVEL
PARAMETERS
DESCRIPTION
RETURN VALUES
CONTEXT
EXAMPLES
SEE ALSO
WARNINGS

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