'\" te
.\" Copyright (c) 2006, Sun Microsystems, Inc. All Rights Reserved.
.\" Copyright 1989 AT&T
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.TH getmajor 9F "16 Jan 2006" "SunOS 5.11" "Kernel Functions for Drivers"
.SH NAME
getmajor \- get major device number
.SH SYNOPSIS
.LP
.nf
#include <sys/types.h>
#include <sys/mkdev.h>
#include <sys/ddi.h>



\fBmajor_t\fR \fBgetmajor\fR(\fBdev_t\fR \fIdev\fR);
.fi

.SH INTERFACE LEVEL
.sp
.LP
Architecture independent level 1 (DDI/DKI).
.SH PARAMETERS
.sp
.ne 2
.mk
.na
\fB\fIdev\fR\fR
.ad
.RS 7n
.rt  
Device number.
.RE

.SH DESCRIPTION
.sp
.LP
The \fBgetmajor()\fR function extracts the major number from a device number.
.SH RETURN VALUES
.sp
.LP
The major number.
.SH CONTEXT
.sp
.LP
The \fBgetmajor()\fR function can be called from user, interrupt, or kernel
context.
.SH EXAMPLES
.LP
\fBExample 1 \fRUsing \fBgetmajor()\fR
.sp
.LP
The following example shows both the \fBgetmajor()\fR and \fBgetminor\fR(9F)
functions used in a debug \fBcmn_err\fR(9F) statement to return the major and
minor numbers for the device supported by the driver.

.sp
.in +2
.nf
dev_t dev; 

#ifdef DEBUG  
cmn_err(CE_NOTE,"Driver Started.  Major# = %d, 	
     Minor# = %d", getmajor(dev), getminor(dev)); 
#endif
.fi
.in -2

.SH SEE ALSO
.sp
.LP
\fBcmn_err\fR(9F), \fBgetminor\fR(9F), \fBmakedevice\fR(9F)
.sp
.LP
\fIWriting Device Drivers\fR
.SH WARNINGS
.sp
.LP
No validity checking is performed. If \fIdev\fR is invalid, an invalid number
is returned.