| 1 | /*
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| 2 | * Copyright (c) 2012 Jakub Jermar
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | /** @addtogroup genericipc
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| 30 | * @{
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| 31 | */
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| 32 | /** @file
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| 33 | */
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| 34 |
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| 35 | #include <ipc/sysipc_ops.h>
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| 36 | #include <ipc/ipc.h>
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| 37 | #include <ipc/ipcrsc.h>
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| 38 | #include <synch/mutex.h>
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| 39 | #include <proc/task.h>
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| 40 | #include <abi/errno.h>
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| 41 | #include <macros.h>
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| 42 |
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| 43 | static int request_preprocess(call_t *call, phone_t *phone)
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| 44 | {
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| 45 | task_t *other_task_s;
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| 46 |
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| 47 | phone_t *sender_phone = phone_get_current(IPC_GET_ARG5(call->data));
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| 48 | if (!sender_phone)
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| 49 | return ENOENT;
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| 50 |
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| 51 | mutex_lock(&sender_phone->lock);
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| 52 | if (sender_phone->state != IPC_PHONE_CONNECTED) {
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| 53 | mutex_unlock(&sender_phone->lock);
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| 54 | return EINVAL;
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| 55 | }
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| 56 |
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| 57 | other_task_s = sender_phone->callee->task;
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| 58 |
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| 59 | mutex_unlock(&sender_phone->lock);
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| 60 |
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| 61 | /* Remember the third party task hash. */
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| 62 | IPC_SET_ARG5(call->data, (sysarg_t) other_task_s);
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| 63 |
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| 64 | return EOK;
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| 65 | }
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| 66 |
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| 67 | static int answer_preprocess(call_t *answer, ipc_data_t *olddata)
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| 68 | {
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| 69 | int rc = EOK;
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| 70 |
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| 71 | if (!IPC_GET_RETVAL(answer->data)) {
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| 72 | /* The recipient authorized the change of state. */
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| 73 | phone_t *recipient_phone;
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| 74 | task_t *other_task_s;
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| 75 | task_t *other_task_r;
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| 76 |
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| 77 | recipient_phone = phone_get_current(IPC_GET_ARG1(answer->data));
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| 78 | if (!recipient_phone) {
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| 79 | IPC_SET_RETVAL(answer->data, ENOENT);
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| 80 | return ENOENT;
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| 81 | }
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| 82 |
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| 83 | mutex_lock(&recipient_phone->lock);
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| 84 | if (recipient_phone->state != IPC_PHONE_CONNECTED) {
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| 85 | mutex_unlock(&recipient_phone->lock);
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| 86 | IPC_SET_RETVAL(answer->data, EINVAL);
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| 87 | return EINVAL;
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| 88 | }
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| 89 |
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| 90 | other_task_r = recipient_phone->callee->task;
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| 91 | other_task_s = (task_t *) IPC_GET_ARG5(*olddata);
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| 92 |
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| 93 | /*
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| 94 | * See if both the sender and the recipient meant the
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| 95 | * same third party task.
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| 96 | */
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| 97 | if (other_task_r != other_task_s) {
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| 98 | IPC_SET_RETVAL(answer->data, EINVAL);
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| 99 | rc = EINVAL;
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| 100 | } else {
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| 101 | rc = event_task_notify_5(other_task_r,
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| 102 | EVENT_TASK_STATE_CHANGE, false,
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| 103 | IPC_GET_ARG1(*olddata),
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| 104 | IPC_GET_ARG2(*olddata),
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| 105 | IPC_GET_ARG3(*olddata),
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| 106 | LOWER32(olddata->task_id),
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| 107 | UPPER32(olddata->task_id));
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| 108 | IPC_SET_RETVAL(answer->data, rc);
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| 109 | }
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| 110 |
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| 111 | mutex_unlock(&recipient_phone->lock);
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| 112 | }
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| 113 |
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| 114 | return rc;
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| 115 | }
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| 116 |
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| 117 | sysipc_ops_t ipc_m_state_change_authorize_ops = {
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| 118 | .request_preprocess = request_preprocess,
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| 119 | .request_forget = null_request_forget,
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| 120 | .request_process = null_request_process,
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| 121 | .answer_cleanup = null_answer_cleanup,
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| 122 | .answer_preprocess = answer_preprocess,
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| 123 | .answer_process = null_answer_process,
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| 124 | };
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| 125 |
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| 126 | /** @}
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| 127 | */
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