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 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 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 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