dapl_evd_query.c revision 9517:b4839b0aa7a4 
1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22/*
23 * Copyright (c) 2002-2003, Network Appliance, Inc. All rights reserved.
24 */
25
26/*
27 * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
28 * Use is subject to license terms.
29 */
30
31/*
32 *
33 * MODULE: dapl_evd_query.c
34 *
35 * PURPOSE: Event management
36 * Description: Interfaces in this file are completely described in
37 *		the DAPL 1.1 API, Chapter 6, section 3
38 *
39 * $Id: dapl_evd_query.c,v 1.8 2003/08/20 13:18:36 sjs2 Exp $
40 */
41
42#include "dapl.h"
43
44/*
45 * dapl_evd_query
46 *
47 * DAPL Requirements Version xxx, 6.3.2.3
48 *
49 * Provides the consumer with arguments of the Event Dispatcher.
50 *
51 * Input:
52 * 	evd_handle
53 * 	evd_mask
54 *
55 * Output:
56 * 	evd_param
57 *
58 * Returns:
59 * 	DAT_SUCCESS
60 * 	DAT_INVALID_PARAMETER
61 */
62DAT_RETURN
63dapl_evd_query(
64	IN	DAT_EVD_HANDLE		evd_handle,
65	IN	DAT_EVD_PARAM_MASK	evd_param_mask,
66	OUT	DAT_EVD_PARAM		*evd_param)
67{
68	DAPL_EVD	    *evd_ptr;
69	DAT_RETURN	    dat_status;
70
71	dat_status = DAT_SUCCESS;
72
73	if (evd_param_mask & ~DAT_EVD_FIELD_ALL) {
74		dat_status = DAT_ERROR(DAT_INVALID_PARAMETER, DAT_INVALID_ARG2);
75		goto bail;
76	}
77
78	if (NULL == evd_param) {
79		dat_status = DAT_ERROR(DAT_INVALID_PARAMETER, DAT_INVALID_ARG3);
80		goto bail;
81	}
82
83	/*
84	 * Note: the spec. allows for events to be directed to a NULL EVD
85	 * with handle of type DAT_HANDLE_NULL. See 6.3.1
86	 */
87	if (DAT_HANDLE_NULL == evd_handle) {
88		(void) dapl_os_memzero(evd_param, sizeof (DAT_EVD_PARAM));
89	} else {
90		if (DAPL_BAD_HANDLE(evd_handle, DAPL_MAGIC_EVD)) {
91			dat_status = DAT_ERROR(DAT_INVALID_HANDLE, 0);
92			goto bail;
93		}
94
95		evd_ptr = (DAPL_EVD *) evd_handle;
96
97		/*
98		 * We may be racing against the thread safe modify
99		 * calls here (dat_evd_{enable,disable,{set,clear}_unwaitable}).
100		 * They are thread safe, so our reads need to be atomic with
101		 * regard to those calls.  The below is ok (a single bit
102		 * read counts as atomic; if it's in transition you'll get one
103		 * of the correct values) but we'll need to be careful
104		 * about reading the state variable atomically when we add
105		 * in waitable/unwaitable.
106		 */
107		evd_param->evd_state =
108		    (evd_ptr->evd_enabled ? DAT_EVD_STATE_ENABLED :
109		    DAT_EVD_STATE_DISABLED);
110		evd_param->evd_state |=
111		    (evd_ptr->evd_waitable ? DAT_EVD_STATE_WAITABLE :
112		    DAT_EVD_STATE_UNWAITABLE);
113		evd_param->ia_handle = evd_ptr->header.owner_ia;
114		evd_param->evd_qlen = evd_ptr->qlen;
115		evd_param->cno_handle = (DAT_CNO_HANDLE) evd_ptr->cno_ptr;
116		evd_param->evd_flags  = evd_ptr->evd_flags;
117	}
118
119bail:
120		return (dat_status);
121}
122