Manual Pages for UNIX Operating System command usage for man getmajor

Kernel Functions for Drivers                         getmajor(9F)



NAME
     getmajor - get major device number

SYNOPSIS
     #include 
     #include 
     #include 



     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  sup-
     ported 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)




SunOS 5.11          Last change: 16 Jan 2006                    1






Kernel Functions for Drivers                         getmajor(9F)



     Writing Device Drivers

WARNINGS
     No validity checking is performed. If  dev  is  invalid,  an
     invalid number is returned.


















































SunOS 5.11          Last change: 16 Jan 2006                    2