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 * Copyright 2007 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 */
25
26 #pragma ident "%Z%%M% %I% %E% SMI"
27
28 #include <sys/types.h>
29 #include <dhcpmsg.h>
30 #include <libinetutil.h>
31 #include <dhcpagent_util.h>
32
33 #include "async.h"
34 #include "util.h"
35 #include "interface.h"
36 #include "script_handler.h"
37 #include "states.h"
38
39 /*
40 * async_start(): starts an asynchronous command on a state machine
41 *
42 * input: dhcp_smach_t *: the state machine to start the async command on
43 * dhcp_ipc_type_t: the command to start
44 * boolean_t: B_TRUE if the command was started by a user
45 * output: boolean: B_TRUE on success, B_FALSE on failure
46 */
47
48 boolean_t
async_start(dhcp_smach_t * dsmp,dhcp_ipc_type_t cmd,boolean_t user)49 async_start(dhcp_smach_t *dsmp, dhcp_ipc_type_t cmd, boolean_t user)
50 {
51 if (dsmp->dsm_async.as_present) {
52 return (B_FALSE);
53 } else {
54 dsmp->dsm_async.as_cmd = cmd;
55 dsmp->dsm_async.as_user = user;
56 dsmp->dsm_async.as_present = B_TRUE;
57 return (B_TRUE);
58 }
59 }
60
61 /*
62 * async_finish(): completes an asynchronous command
63 *
64 * input: dhcp_smach_t *: the state machine with the pending async command
65 * output: void
66 * note: should only be used when the command has no residual state to
67 * clean up
68 */
69
70 void
async_finish(dhcp_smach_t * dsmp)71 async_finish(dhcp_smach_t *dsmp)
72 {
73 /*
74 * be defensive here. the script may still be running if
75 * the asynchronous action times out before it is killed by the
76 * script helper process.
77 */
78
79 if (dsmp->dsm_script_pid != -1)
80 script_stop(dsmp);
81 dsmp->dsm_async.as_present = B_FALSE;
82 }
83
84 /*
85 * async_cancel(): cancels a pending asynchronous command
86 *
87 * input: dhcp_smach_t *: the state machine with the pending async command
88 * output: boolean: B_TRUE if cancellation was successful, B_FALSE on failure
89 */
90
91 boolean_t
async_cancel(dhcp_smach_t * dsmp)92 async_cancel(dhcp_smach_t *dsmp)
93 {
94 if (!dsmp->dsm_async.as_present)
95 return (B_TRUE);
96 if (dsmp->dsm_async.as_user) {
97 dhcpmsg(MSG_DEBUG,
98 "async_cancel: cannot abort command %d from user",
99 (int)dsmp->dsm_async.as_cmd);
100 return (B_FALSE);
101 } else {
102 async_finish(dsmp);
103 dhcpmsg(MSG_DEBUG, "async_cancel: command %d aborted",
104 (int)dsmp->dsm_async.as_cmd);
105 return (B_TRUE);
106 }
107 }
108