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      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