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]
#include <sys/stream.h> mblk_t *dupmsg(mblk_t *mp);
Architecture independent level 1 (DDI/DKI).
Pointer to the message.
dupmsg() forms a new message by copying the message block descriptors pointed to by mp and linking them. dupb(9F) is called for each message block. The data blocks themselves are not duplicated.
If successful, dupmsg() returns a pointer to the new message block. Otherwise, it returns a NULL pointer. A return value of NULL indicates either memory depletion or the data block reference count, db_ref (see datab(9S)), has reached a limit (255). See dupb(9F).
dupmsg() can be called from user, kernel, or interrupt context.
Example 1 Using dupmsg()
See copyb(9F) for an example using dupmsg().
copyb (9F), copymsg (9F), dupb (9F), datab (9S)
Writing Device Drivers
STREAMS Programming Guide