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]
#include <sys/stream.h> int putnextctl1(queue_t *q, int type, int p);
Architecture independent level 1 (DDI/DKI).
q
Queue to which the message is to be sent.
type
Type of message.
p
One-byte parameter.
The putnextctl1() function, like putctl1(9F), tests the type argument to make sure a data type has not been specified, and attempts to allocate a message block. The p parameter can be used, for example, to specify how long the delay will be when an M_DELAY message is being sent. putnextctl1() fails if type is M_DATA, M_PROTO, or M_PCPROTO, or if a message block cannot be allocated. If successful, putnextctl1() calls the put(9E) routine of the queue pointed to by q with the newly allocated and initialized message.
A call to putnextctl1(q,type, p) is an atomic equivalent of putctl1(q->q_next, type, p). The STREAMS framework provides whatever mutual exclusion is necessary to insure that dereferencing q through its q_next field and then invoking putctl1(9F) proceeds without interference from other threads.
The putnextctl1() function should always be used in preference to putctl1(9F)
On success, 1 is returned. 0 is returned if type is a data type, or if a message block cannot be allocated.
The putnextctl1() function can be called from user, interrupt, or kernel context.
See the putnextctl(9F) function page for an example of putnextctl1().
put(9E), allocb(9F), datamsg(9F), putctl1(9F), putnextctl(9F)
Writing Device Drivers
STREAMS Programming Guide