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getmajor(9f) [mojave man page]

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)

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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)

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