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Copyright 1989 AT&T
Copyright (c) 2006, Sun Microsystems, Inc. All Rights Reserved
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]
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Copyright 1989 AT&T
Copyright (c) 2006, Sun Microsystems, Inc. All Rights Reserved
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]
DATAMSG 9F "Feb 17, 2023"
NAME
datamsg - test whether a message is a data message
SYNOPSIS
#include <sys/stream.h> #include <sys/ddi.h> int datamsg(unsigned char type);
INTERFACE LEVEL
Architecture independent level 1 (DDI/DKI).
PARAMETERS
type
The type of message to be tested. The db_type field of the datab(9S) structure contains the message type. This field may be accessed through the message block using mp->b_datap->db_type.
DESCRIPTION
The datamsg() function tests the type of message to determine if it is a
data message type (M_DATA, M_DELAY, M_PROTO, or
M_PCPROTO).
RETURN VALUES
datamsg returns
1
if the message is a data message
otherwise.
CONTEXT
The datamsg() function can be called from user, interrupt, or kernel
context.
EXAMPLES
The put(9E) routine enqueues all data messages for handling by the
srv(9E) (service) routine. All non-data messages are handled in the
put(9E) routine.
1 xxxput(q, mp)
2 queue_t *q;
3 mblk_t *mp;
4 {
5 if (datamsg(mp->b_datap->db_type)) {
6 putq(q, mp);
7 return;
8 }
9 switch (mp->b_datap->db_type) {
10 case M_FLUSH:
.\|.\|.
11 }
12 }
SEE ALSO
put (9E), srv (9E), allocb (9F), datab (9S), msgb (9S) Writing Device Drivers
STREAMS Programming Guide