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DEVICE_IDS (9) | Kernel routines | Unix Manual Pages | :man▋

NAME

device_ids, major, minor, umajor, uminor - "calculate device ids"

CONTENTS

Synopsis
Description
Return Values
Authors

SYNOPSIS


.In sys/types.h
.In sys/systm.h int major "struct cdev *dev" int minor "struct cdev *dev" int umajor "dev_t id" int uminor "dev_t id"

DESCRIPTION

The device_ids family of functions take either the raw device ID, id, or a pointer to the device structure, dev, and return the integer value that is the major or minor device ID as requested.

The actual major and minor device IDs are values masked from of the raw device ID. For details on the actual calculations used to determine the major or minor IDs see the actual source in kern_conf.c.

RETURN VALUES

An integer greater than zero and less than NUMCDEVSW. major and minor will return NODEV if the device is invalid.

AUTHORS

This manual page was written by
.An Chad David Aq davidc@acns.ab.ca .

June 22, 2004 DEVICE_IDS (9)
shtml">manServer 1.07 from device_ids.9 using doc macros.

 
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