'\" te
.\" Copyright (c) 2006, Sun Microsystems, Inc. All Rights Reserved.
.\" Copyright 1989 AT&T
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.TH GETMAJOR 9F "Jan 16, 2006"
.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
.na
\fB\fIdev\fR\fR
.ad
.RS 7n
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
.BR cmn_err (9F),
.BR getminor (9F),
.BR makedevice (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.