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