Index for Section 9

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major(9r)
NAME
  major - General: Returns the device major number

SYNOPSIS
  #include <sys/types.h>


  int major(
	  dev_t device );

ARGUMENTS
  device
      Specifies the number of the device whose associated major device number
      the major interface will obtain.

DESCRIPTION
  The major interface returns the device major number associated with the
  device specified by the device argument. Device driver writers use the
  dev_t data type to represent a device's major and minor numbers. This data
  type is an abstraction of the internal representations of the major and
  minor numbers.  Driver writers do not need to know how the system
  internally represents the major and minor numbers. To ensure maximum
  portability of the device driver, use the major interface to extract the
  major number portion of this internal representation.

RETURN VALUES
  Upon successful completion, major returns the major number portion of the
  dev_t passed as the argument.

SEE ALSO
  Kernel Interfaces: makedev(9r), minor(9r)

Index for Section 9

Alphabetical listing for M

Top of page