1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
|
/*
* CDDL HEADER START
*
* 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]
*
* CDDL HEADER END
*/
/*
* Copyright 2007 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#include <sys/types.h>
#include <dhcpmsg.h>
#include <libinetutil.h>
#include <dhcpagent_util.h>
#include "async.h"
#include "util.h"
#include "interface.h"
#include "script_handler.h"
#include "states.h"
/*
* async_start(): starts an asynchronous command on a state machine
*
* input: dhcp_smach_t *: the state machine to start the async command on
* dhcp_ipc_type_t: the command to start
* boolean_t: B_TRUE if the command was started by a user
* output: boolean: B_TRUE on success, B_FALSE on failure
*/
boolean_t
async_start(dhcp_smach_t *dsmp, dhcp_ipc_type_t cmd, boolean_t user)
{
if (dsmp->dsm_async.as_present) {
return (B_FALSE);
} else {
dsmp->dsm_async.as_cmd = cmd;
dsmp->dsm_async.as_user = user;
dsmp->dsm_async.as_present = B_TRUE;
return (B_TRUE);
}
}
/*
* async_finish(): completes an asynchronous command
*
* input: dhcp_smach_t *: the state machine with the pending async command
* output: void
* note: should only be used when the command has no residual state to
* clean up
*/
void
async_finish(dhcp_smach_t *dsmp)
{
/*
* be defensive here. the script may still be running if
* the asynchronous action times out before it is killed by the
* script helper process.
*/
if (dsmp->dsm_script_pid != -1)
script_stop(dsmp);
dsmp->dsm_async.as_present = B_FALSE;
}
/*
* async_cancel(): cancels a pending asynchronous command
*
* input: dhcp_smach_t *: the state machine with the pending async command
* output: boolean: B_TRUE if cancellation was successful, B_FALSE on failure
*/
boolean_t
async_cancel(dhcp_smach_t *dsmp)
{
if (!dsmp->dsm_async.as_present)
return (B_TRUE);
if (dsmp->dsm_async.as_user) {
dhcpmsg(MSG_DEBUG,
"async_cancel: cannot abort command %d from user",
(int)dsmp->dsm_async.as_cmd);
return (B_FALSE);
} else {
async_finish(dsmp);
dhcpmsg(MSG_DEBUG, "async_cancel: command %d aborted",
(int)dsmp->dsm_async.as_cmd);
return (B_TRUE);
}
}
|