1getmajor(9F)             Kernel Functions for Drivers             getmajor(9F)
2
3
4

NAME

6       getmajor - get major device number
7

SYNOPSIS

9       #include <sys/types.h>
10       #include <sys/mkdev.h>
11       #include <sys/ddi.h>
12
13
14
15       major_t getmajor(dev_t dev);
16
17

INTERFACE LEVEL

19       Architecture independent level 1 (DDI/DKI).
20

PARAMETERS

22       dev    Device number.
23
24

DESCRIPTION

26       The getmajor() function extracts the major number from a device number.
27

RETURN VALUES

29       The major number.
30

CONTEXT

32       The  getmajor()  function can be called from user, interrupt, or kernel
33       context.
34

EXAMPLES

36       Example 1 Using getmajor()
37
38
39       The following example shows both the getmajor() and getminor(9F)  func‐
40       tions  used  in  a  debug cmn_err(9F) statement to return the major and
41       minor numbers for the device supported by the driver.
42
43
44         dev_t dev;
45
46         #ifdef DEBUG
47         cmn_err(CE_NOTE,"Driver Started.  Major# = %d,
48              Minor# = %d", getmajor(dev), getminor(dev));
49         #endif
50
51

SEE ALSO

53       cmn_err(9F), getminor(9F), makedevice(9F)
54
55
56       Writing Device Drivers
57

WARNINGS

59       No validity checking is performed. If dev is invalid, an invalid number
60       is returned.
61
62
63
64SunOS 5.11                        16 Jan 2006                     getmajor(9F)