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)