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 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 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 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