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Copyright (c) 2006, Sun Microsystems, Inc. All Rights Reserved.
Copyright 1989 AT&T
The contents of this file are subject to the terms of the Common Development and Distribution License (the "License"). You may not use this file except in compliance with the License.
You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE or http://www.opensolaris.org/os/licensing. See the License for the specific language governing permissions and limitations under the License.
When distributing Covered Code, include this CDDL HEADER in each file and include the License file at usr/src/OPENSOLARIS.LICENSE. If applicable, add the following below this CDDL HEADER, with the fields enclosed by brackets "[]" replaced with your own identifying information: Portions Copyright [yyyy] [name of copyright owner]
Copyright (c) 2006, Sun Microsystems, Inc. All Rights Reserved.
Copyright 1989 AT&T
The contents of this file are subject to the terms of the Common Development and Distribution License (the "License"). You may not use this file except in compliance with the License.
You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE or http://www.opensolaris.org/os/licensing. See the License for the specific language governing permissions and limitations under the License.
When distributing Covered Code, include this CDDL HEADER in each file and include the License file at usr/src/OPENSOLARIS.LICENSE. If applicable, add the following below this CDDL HEADER, with the fields enclosed by brackets "[]" replaced with your own identifying information: Portions Copyright [yyyy] [name of copyright owner]
getmajor 9F "16 Jan 2006" "SunOS 5.11" "Kernel Functions for Drivers"
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
The getmajor() function extracts the major number from a device number.
RETURN VALUES
The major number.
CONTEXT
The getmajor() function can be called from user, interrupt, or kernel 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.