Changes in / [0851a3d:ac307b2] in mainline
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- 1 added
- 13 edited
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abi/include/abi/ipc/methods.h
r0851a3d rac307b2 36 36 #define ABI_IPC_METHODS_H_ 37 37 38 #include <abi/cap.h> 39 38 40 /* Well known phone descriptors */ 39 #define PHONE_NS 041 #define PHONE_NS (CAP_NIL + 1) 40 42 41 43 /** Kernel IPC interfaces -
kernel/generic/include/cap/cap.h
r0851a3d rac307b2 53 53 54 54 typedef enum { 55 KOBJECT_TYPE_CALL, 56 KOBJECT_TYPE_IRQ, 55 57 KOBJECT_TYPE_PHONE, 56 KOBJECT_TYPE_IRQ,57 58 KOBJECT_TYPE_MAX 58 59 } kobject_type_t; 59 60 60 61 struct task; 62 63 struct call; 64 struct irq; 61 65 struct phone; 62 struct irq;63 66 64 67 struct kobject; … … 79 82 union { 80 83 void *raw; 84 struct call *call; 85 struct irq *irq; 81 86 struct phone *phone; 82 struct irq *irq;83 87 }; 84 88 } kobject_t; -
kernel/generic/include/ipc/ipc.h
r0851a3d rac307b2 106 106 /** Phone which made or last masqueraded this call. */ 107 107 phone_t *phone; 108 /** Flags */ 109 unsigned flags; 110 /** User-defined label */ 111 sysarg_t label; 108 112 } ipc_data_t; 109 113 110 114 typedef struct { 115 kobject_t *kobject; 116 111 117 /** 112 118 * Task link. … … 115 121 */ 116 122 link_t ta_link; 117 118 atomic_t refcnt;119 123 120 124 /** Answerbox link. */ -
kernel/generic/include/ipc/sysipc.h
r0851a3d rac307b2 44 44 extern sysarg_t sys_ipc_call_async_fast(sysarg_t, sysarg_t, sysarg_t, 45 45 sysarg_t, sysarg_t, sysarg_t); 46 extern sysarg_t sys_ipc_call_async_slow(sysarg_t, ipc_data_t * );46 extern sysarg_t sys_ipc_call_async_slow(sysarg_t, ipc_data_t *, sysarg_t); 47 47 extern sysarg_t sys_ipc_answer_fast(sysarg_t, sysarg_t, sysarg_t, sysarg_t, 48 48 sysarg_t, sysarg_t); -
kernel/generic/src/cap/cap.c
r0851a3d rac307b2 73 73 74 74 #include <cap/cap.h> 75 #include <abi/cap.h> 75 76 #include <proc/task.h> 76 77 #include <synch/mutex.h> … … 81 82 #include <stdint.h> 82 83 83 #define MAX_CAPS INT_MAX 84 #define CAPS_START (CAP_NIL + 1) 85 #define CAPS_SIZE (INT_MAX - CAPS_START) 86 #define CAPS_LAST (CAPS_SIZE - 1) 84 87 85 88 static slab_cache_t *cap_slab; … … 129 132 if (!task->cap_info->handles) 130 133 goto error_handles; 131 if (!ra_span_add(task->cap_info->handles, 0, MAX_CAPS))134 if (!ra_span_add(task->cap_info->handles, CAPS_START, CAPS_SIZE)) 132 135 goto error_span; 133 136 if (!hash_table_create(&task->cap_info->caps, 0, 0, &caps_ops)) … … 220 223 assert(mutex_locked(&task->cap_info->lock)); 221 224 222 if ((handle < 0) || (handle >= MAX_CAPS))225 if ((handle < CAPS_START) || (handle > CAPS_LAST)) 223 226 return NULL; 224 227 ht_link_t *link = hash_table_find(&task->cap_info->caps, &handle); … … 357 360 void cap_free(task_t *task, cap_handle_t handle) 358 361 { 359 assert(handle >= 0);360 assert(handle < MAX_CAPS);362 assert(handle >= CAPS_START); 363 assert(handle <= CAPS_LAST); 361 364 362 365 mutex_lock(&task->cap_info->lock); -
kernel/generic/src/ipc/ipc.c
r0851a3d rac307b2 87 87 } 88 88 89 void ipc_call_hold(call_t *call) 90 { 91 atomic_inc(&call->refcnt); 92 } 93 94 void ipc_call_release(call_t *call) 95 { 96 if (atomic_predec(&call->refcnt) == 0) { 97 if (call->buffer) 98 free(call->buffer); 99 if (call->caller_phone) 100 kobject_put(call->caller_phone->kobject); 101 slab_free(call_slab, call); 102 } 103 } 89 static void call_destroy(void *arg) 90 { 91 call_t *call = (call_t *) arg; 92 93 if (call->buffer) 94 free(call->buffer); 95 if (call->caller_phone) 96 kobject_put(call->caller_phone->kobject); 97 slab_free(call_slab, call); 98 } 99 100 static kobject_ops_t call_kobject_ops = { 101 .destroy = call_destroy 102 }; 104 103 105 104 /** Allocate and initialize a call structure. … … 117 116 { 118 117 call_t *call = slab_alloc(call_slab, flags); 119 if (call) { 120 _ipc_call_init(call); 121 ipc_call_hold(call); 122 } 118 if (!call) 119 return NULL; 120 kobject_t *kobj = (kobject_t *) malloc(sizeof(kobject_t), flags); 121 if (!kobj) { 122 slab_free(call_slab, call); 123 return NULL; 124 } 125 126 _ipc_call_init(call); 127 kobject_initialize(kobj, KOBJECT_TYPE_CALL, call, &call_kobject_ops); 128 call->kobject = kobj; 123 129 124 130 return call; 125 }126 127 /** Deallocate a call structure.128 *129 * @param call Call structure to be freed.130 *131 */132 void ipc_call_free(call_t *call)133 {134 ipc_call_release(call);135 131 } 136 132 … … 290 286 /* This is a forgotten call and call->sender is not valid. */ 291 287 spinlock_unlock(&call->forget_lock); 292 ipc_call_free(call);288 kobject_put(call->kobject); 293 289 return; 294 290 } else { … … 705 701 * must hold a reference to it. 706 702 */ 707 ipc_call_hold(call);703 kobject_add_ref(call->kobject); 708 704 709 705 spinlock_unlock(&call->forget_lock); … … 714 710 SYSIPC_OP(request_forget, call); 715 711 716 ipc_call_release(call);712 kobject_put(call->kobject); 717 713 } 718 714 … … 822 818 SYSIPC_OP(answer_process, call); 823 819 824 ipc_call_free(call);820 kobject_put(call->kobject); 825 821 goto restart; 826 822 } -
kernel/generic/src/ipc/sysipc.c
r0851a3d rac307b2 286 286 #endif 287 287 288 ipc_call_hold(call);288 kobject_add_ref(call->kobject); 289 289 rc = ipc_call_sync(kobj->phone, call); 290 290 spinlock_lock(&call->forget_lock); 291 291 bool forgotten = call->forget; 292 292 spinlock_unlock(&call->forget_lock); 293 ipc_call_release(call);293 kobject_put(call->kobject); 294 294 295 295 #ifdef CONFIG_UDEBUG … … 306 306 * deallocation. 307 307 */ 308 ipc_call_free(call);308 kobject_put(call->kobject); 309 309 } else { 310 310 /* … … 323 323 324 324 memcpy(data->args, call->data.args, sizeof(data->args)); 325 ipc_call_free(call);325 kobject_put(call->kobject); 326 326 kobject_put(kobj); 327 327 … … 347 347 /** Make a fast asynchronous call over IPC. 348 348 * 349 * This function can only handle fourarguments of payload, but is faster than349 * This function can only handle three arguments of payload, but is faster than 350 350 * the generic function sys_ipc_call_async_slow(). 351 351 * … … 355 355 * @param arg2 Service-defined payload argument. 356 356 * @param arg3 Service-defined payload argument. 357 * @param arg4 Service-defined payload argument.357 * @param label User-defined label. 358 358 * 359 359 * @return Call hash on success. … … 362 362 */ 363 363 sysarg_t sys_ipc_call_async_fast(sysarg_t handle, sysarg_t imethod, 364 sysarg_t arg1, sysarg_t arg2, sysarg_t arg3, sysarg_t arg4)364 sysarg_t arg1, sysarg_t arg2, sysarg_t arg3, sysarg_t label) 365 365 { 366 366 kobject_t *kobj = kobject_get(TASK, handle, KOBJECT_TYPE_PHONE); … … 378 378 IPC_SET_ARG2(call->data, arg2); 379 379 IPC_SET_ARG3(call->data, arg3); 380 IPC_SET_ARG4(call->data, arg4);381 380 382 381 /* … … 385 384 */ 386 385 IPC_SET_ARG5(call->data, 0); 386 387 /* Set the user-defined label */ 388 call->data.label = label; 387 389 388 390 int res = request_preprocess(call, kobj->phone); … … 401 403 * @param handle Phone capability for the call. 402 404 * @param data Userspace address of call data with the request. 405 * @param label User-defined label. 403 406 * 404 407 * @return See sys_ipc_call_async_fast(). 405 408 * 406 409 */ 407 sysarg_t sys_ipc_call_async_slow(sysarg_t handle, ipc_data_t *data) 410 sysarg_t sys_ipc_call_async_slow(sysarg_t handle, ipc_data_t *data, 411 sysarg_t label) 408 412 { 409 413 kobject_t *kobj = kobject_get(TASK, handle, KOBJECT_TYPE_PHONE); … … 420 424 sizeof(call->data.args)); 421 425 if (rc != 0) { 422 ipc_call_free(call);426 kobject_put(call->kobject); 423 427 kobject_put(kobj); 424 428 return (sysarg_t) rc; 425 429 } 430 431 /* Set the user-defined label */ 432 call->data.label = label; 426 433 427 434 int res = request_preprocess(call, kobj->phone); … … 721 728 * 722 729 * @return Hash of the call. 723 * If IPC_CALLID_NOTIFICATION bit is set in the hash, the724 * call is a notification. IPC_CALLID_ANSWERED denotes an725 * answer.726 *727 730 */ 728 731 sysarg_t sys_ipc_wait_for_call(ipc_data_t *calldata, uint32_t usec, … … 751 754 call->data.phone = (void *) call->priv; 752 755 756 call->data.flags = IPC_CALLID_NOTIFICATION; 757 753 758 STRUCT_TO_USPACE(calldata, &call->data); 759 kobject_put(call->kobject); 754 760 755 ipc_call_free(call); 756 757 return ((sysarg_t) call) | IPC_CALLID_NOTIFICATION; 761 return (sysarg_t) call; 758 762 } 759 763 … … 762 766 763 767 if (call->flags & IPC_CALL_DISCARD_ANSWER) { 764 ipc_call_free(call);768 kobject_put(call->kobject); 765 769 goto restart; 766 770 } 771 772 call->data.flags = IPC_CALLID_ANSWERED; 767 773 768 774 STRUCT_TO_USPACE(calldata, &call->data); 769 ipc_call_free(call);775 kobject_put(call->kobject); 770 776 771 return ( (sysarg_t) call) | IPC_CALLID_ANSWERED;777 return (sysarg_t) call; 772 778 } 773 779 -
uspace/app/trace/ipcp.c
r0851a3d rac307b2 323 323 pending_call_t *pcall; 324 324 325 if ((hash & IPC_CALLID_ANSWERED) == 0 && hash != IPCP_CALLID_SYNC) { 325 if ((call->flags & IPC_CALLID_ANSWERED) == 0 && 326 hash != IPCP_CALLID_SYNC) { 326 327 /* Not a response */ 327 328 if ((display_mask & DM_IPC) != 0) { … … 331 332 } 332 333 333 hash = hash & ~IPC_CALLID_ANSWERED;334 335 334 item = hash_table_find(&pending_calls, &hash); 336 335 if (item == NULL) -
uspace/app/trace/syscalls.c
r0851a3d rac307b2 54 54 55 55 [SYS_IPC_CALL_ASYNC_FAST] = { "ipc_call_async_fast", 6, V_HASH }, 56 [SYS_IPC_CALL_ASYNC_SLOW] = { "ipc_call_async_slow", 2, V_HASH },56 [SYS_IPC_CALL_ASYNC_SLOW] = { "ipc_call_async_slow", 3, V_HASH }, 57 57 58 58 [SYS_IPC_ANSWER_FAST] = { "ipc_answer_fast", 6, V_ERRNO }, -
uspace/lib/c/generic/async.c
r0851a3d rac307b2 1341 1341 1342 1342 /* Kernel notification */ 1343 if ( (callid & IPC_CALLID_NOTIFICATION)) {1343 if (call->flags & IPC_CALLID_NOTIFICATION) { 1344 1344 fibril_t *fibril = (fibril_t *) __tcb_get()->fibril_data; 1345 1345 unsigned oldsw = fibril->switches; … … 1495 1495 } 1496 1496 1497 if (call id& IPC_CALLID_ANSWERED)1497 if (call.flags & IPC_CALLID_ANSWERED) 1498 1498 continue; 1499 1499 -
uspace/lib/c/generic/ipc.c
r0851a3d rac307b2 1 1 /* 2 2 * Copyright (c) 2006 Ondrej Palkovsky 3 * Copyright (c) 2017 Jakub Jermar 3 4 * All rights reserved. 4 5 * … … 50 51 51 52 /** 52 * Structures of this type are used for keeping track 53 * of sent asynchronous calls and queing unsent calls. 54 */ 55 typedef struct { 56 link_t list; 57 53 * Structures of this type are used for keeping track of sent asynchronous calls. 54 */ 55 typedef struct async_call { 58 56 ipc_async_callback_t callback; 59 57 void *private; 60 58 61 union { 62 ipc_callid_t callid; 63 struct { 64 ipc_call_t data; 65 int phoneid; 66 } msg; 67 } u; 68 69 /** Fibril waiting for sending this call. */ 70 fid_t fid; 59 struct { 60 ipc_call_t data; 61 int phoneid; 62 } msg; 71 63 } async_call_t; 72 73 LIST_INITIALIZE(dispatched_calls);74 75 /** List of asynchronous calls that were not accepted by kernel.76 *77 * Protected by async_futex, because if the call is not accepted78 * by the kernel, the async framework is used automatically.79 *80 */81 LIST_INITIALIZE(queued_calls);82 83 static futex_t ipc_futex = FUTEX_INITIALIZER;84 85 /** Send asynchronous message via syscall.86 *87 * @param phoneid Phone handle for the call.88 * @param data Call data with the request.89 *90 * @return Hash of the call or an error code.91 *92 */93 static ipc_callid_t ipc_call_async_internal(int phoneid, ipc_call_t *data)94 {95 return __SYSCALL2(SYS_IPC_CALL_ASYNC_SLOW, phoneid, (sysarg_t) data);96 }97 64 98 65 /** Prologue for ipc_call_async_*() functions. … … 133 100 if (!call) { 134 101 /* Nothing to do regardless if failed or not */ 135 futex_unlock(&ipc_futex);136 102 return; 137 103 } 138 104 139 105 if (callid == (ipc_callid_t) IPC_CALLRET_FATAL) { 140 futex_unlock(&ipc_futex);141 142 106 /* Call asynchronous handler with error code */ 143 107 if (call->callback) … … 147 111 return; 148 112 } 149 150 call->u.callid = callid;151 152 /* Add call to the list of dispatched calls */153 list_append(&call->list, &dispatched_calls);154 futex_unlock(&ipc_futex);155 113 } 156 114 157 115 /** Fast asynchronous call. 158 116 * 159 * This function can only handle fourarguments of payload. It is, however,117 * This function can only handle three arguments of payload. It is, however, 160 118 * faster than the more generic ipc_call_async_slow(). 161 119 * … … 171 129 * @param arg2 Service-defined payload argument. 172 130 * @param arg3 Service-defined payload argument. 173 * @param arg4 Service-defined payload argument.174 131 * @param private Argument to be passed to the answer/error callback. 175 132 * @param callback Answer or error callback. 176 133 */ 177 134 void ipc_call_async_fast(int phoneid, sysarg_t imethod, sysarg_t arg1, 178 sysarg_t arg2, sysarg_t arg3, sysarg_t arg4, void *private, 179 ipc_async_callback_t callback) 180 { 181 async_call_t *call = NULL; 182 183 if (callback) { 184 call = ipc_prepare_async(private, callback); 185 if (!call) 186 return; 187 } 188 189 /* 190 * We need to make sure that we get callid 191 * before another thread accesses the queue again. 192 */ 193 194 futex_lock(&ipc_futex); 135 sysarg_t arg2, sysarg_t arg3, void *private, ipc_async_callback_t callback) 136 { 137 async_call_t *call = ipc_prepare_async(private, callback); 138 if (!call) 139 return; 140 195 141 ipc_callid_t callid = __SYSCALL6(SYS_IPC_CALL_ASYNC_FAST, phoneid, 196 imethod, arg1, arg2, arg3, arg4);142 imethod, arg1, arg2, arg3, (sysarg_t) call); 197 143 198 144 ipc_finish_async(callid, phoneid, call); … … 225 171 return; 226 172 227 IPC_SET_IMETHOD(call->u.msg.data, imethod); 228 IPC_SET_ARG1(call->u.msg.data, arg1); 229 IPC_SET_ARG2(call->u.msg.data, arg2); 230 IPC_SET_ARG3(call->u.msg.data, arg3); 231 IPC_SET_ARG4(call->u.msg.data, arg4); 232 IPC_SET_ARG5(call->u.msg.data, arg5); 233 234 /* 235 * We need to make sure that we get callid 236 * before another threadaccesses the queue again. 237 */ 238 239 futex_lock(&ipc_futex); 240 ipc_callid_t callid = 241 ipc_call_async_internal(phoneid, &call->u.msg.data); 173 IPC_SET_IMETHOD(call->msg.data, imethod); 174 IPC_SET_ARG1(call->msg.data, arg1); 175 IPC_SET_ARG2(call->msg.data, arg2); 176 IPC_SET_ARG3(call->msg.data, arg3); 177 IPC_SET_ARG4(call->msg.data, arg4); 178 IPC_SET_ARG5(call->msg.data, arg5); 179 180 ipc_callid_t callid = __SYSCALL3(SYS_IPC_CALL_ASYNC_SLOW, phoneid, 181 (sysarg_t) &call->msg.data, (sysarg_t) call); 242 182 243 183 ipc_finish_async(callid, phoneid, call); … … 296 236 } 297 237 298 /** Try to dispatch queued calls from the async queue.299 *300 */301 static void dispatch_queued_calls(void)302 {303 /** @todo304 * Integrate intelligently ipc_futex so that it is locked during305 * ipc_call_async_*() until it is added to dispatched_calls.306 */307 308 futex_down(&async_futex);309 310 while (!list_empty(&queued_calls)) {311 async_call_t *call =312 list_get_instance(list_first(&queued_calls), async_call_t, list);313 ipc_callid_t callid =314 ipc_call_async_internal(call->u.msg.phoneid, &call->u.msg.data);315 316 list_remove(&call->list);317 318 futex_up(&async_futex);319 320 assert(call->fid);321 fibril_add_ready(call->fid);322 323 if (callid == (ipc_callid_t) IPC_CALLRET_FATAL) {324 if (call->callback)325 call->callback(call->private, ENOENT, NULL);326 327 free(call);328 } else {329 call->u.callid = callid;330 331 futex_lock(&ipc_futex);332 list_append(&call->list, &dispatched_calls);333 futex_unlock(&ipc_futex);334 }335 336 futex_down(&async_futex);337 }338 339 futex_up(&async_futex);340 }341 342 238 /** Handle received answer. 343 *344 * Find the hash of the answer and call the answer callback.345 *346 * The answer has the same hash as the request OR'ed with347 * the IPC_CALLID_ANSWERED bit.348 *349 * @todo Use hash table.350 239 * 351 240 * @param callid Hash of the received answer. 352 241 * @param data Call data of the answer. 353 *354 242 */ 355 243 static void handle_answer(ipc_callid_t callid, ipc_call_t *data) 356 244 { 357 callid &= ~IPC_CALLID_ANSWERED; 358 359 futex_lock(&ipc_futex); 360 361 link_t *item; 362 for (item = dispatched_calls.head.next; item != &dispatched_calls.head; 363 item = item->next) { 364 async_call_t *call = 365 list_get_instance(item, async_call_t, list); 366 367 if (call->u.callid == callid) { 368 list_remove(&call->list); 369 370 futex_unlock(&ipc_futex); 371 372 if (call->callback) 373 call->callback(call->private, 374 IPC_GET_RETVAL(*data), data); 375 376 free(call); 377 return; 378 } 379 } 380 381 futex_unlock(&ipc_futex); 245 async_call_t *call = data->label; 246 247 if (!call) 248 return; 249 250 if (call->callback) 251 call->callback(call->private, IPC_GET_RETVAL(*data), data); 252 free(call); 382 253 } 383 254 … … 388 259 * @param flags Flags passed to SYS_IPC_WAIT (blocking, nonblocking). 389 260 * 390 * @return Hash of the call. Note that certain bits have special 391 * meaning: IPC_CALLID_ANSWERED is set in an answer 392 * and IPC_CALLID_NOTIFICATION is used for notifications. 393 * 261 * @return Hash of the call. 394 262 */ 395 263 ipc_callid_t ipc_wait_cycle(ipc_call_t *call, sysarg_t usec, … … 400 268 401 269 /* Handle received answers */ 402 if (callid & IPC_CALLID_ANSWERED) {270 if (callid && (call->flags & IPC_CALLID_ANSWERED)) 403 271 handle_answer(callid, call); 404 dispatch_queued_calls();405 }406 272 407 273 return callid; … … 432 298 do { 433 299 callid = ipc_wait_cycle(call, usec, SYNCH_FLAGS_NONE); 434 } while (callid & IPC_CALLID_ANSWERED);300 } while (callid && (call->flags & IPC_CALLID_ANSWERED)); 435 301 436 302 return callid; … … 453 319 callid = ipc_wait_cycle(call, SYNCH_NO_TIMEOUT, 454 320 SYNCH_FLAGS_NON_BLOCKING); 455 } while (callid & IPC_CALLID_ANSWERED);321 } while (callid && (call->flags & IPC_CALLID_ANSWERED)); 456 322 457 323 return callid; -
uspace/lib/c/include/ipc/common.h
r0851a3d rac307b2 43 43 #define IPC_FLAG_BLOCKING 0x01 44 44 45 struct async_call; 46 45 47 typedef struct { 46 48 sysarg_t args[IPC_CALL_LEN]; 47 49 task_id_t in_task_id; 48 50 sysarg_t in_phone_hash; 51 unsigned flags; 52 struct async_call *label; 49 53 } ipc_call_t; 50 54 -
uspace/lib/c/include/ipc/ipc.h
r0851a3d rac307b2 89 89 90 90 #define ipc_call_async_0(phoneid, method, private, callback) \ 91 ipc_call_async_fast((phoneid), (method), 0, 0, 0, 0, (private), \ 92 (callback)) 91 ipc_call_async_fast((phoneid), (method), 0, 0, 0, (private), (callback)) 93 92 #define ipc_call_async_1(phoneid, method, arg1, private, callback) \ 94 ipc_call_async_fast((phoneid), (method), (arg1), 0, 0, 0,(private), \93 ipc_call_async_fast((phoneid), (method), (arg1), 0, 0, (private), \ 95 94 (callback)) 96 95 #define ipc_call_async_2(phoneid, method, arg1, arg2, private, callback) \ 97 ipc_call_async_fast((phoneid), (method), (arg1), (arg2), 0, 0,\96 ipc_call_async_fast((phoneid), (method), (arg1), (arg2), 0, \ 98 97 (private), (callback)) 99 98 #define ipc_call_async_3(phoneid, method, arg1, arg2, arg3, private, callback) \ 100 ipc_call_async_fast((phoneid), (method), (arg1), (arg2), (arg3), 0,\99 ipc_call_async_fast((phoneid), (method), (arg1), (arg2), (arg3), \ 101 100 (private), (callback)) 102 101 #define ipc_call_async_4(phoneid, method, arg1, arg2, arg3, arg4, private, \ 103 102 callback) \ 104 ipc_call_async_ fast((phoneid), (method), (arg1), (arg2), (arg3), \105 (arg4), (private), (callback))103 ipc_call_async_slow((phoneid), (method), (arg1), (arg2), (arg3), \ 104 (arg4), 0, (private), (callback)) 106 105 #define ipc_call_async_5(phoneid, method, arg1, arg2, arg3, arg4, arg5, \ 107 106 private, callback) \ … … 110 109 111 110 extern void ipc_call_async_fast(int, sysarg_t, sysarg_t, sysarg_t, sysarg_t, 112 sysarg_t,void *, ipc_async_callback_t);111 void *, ipc_async_callback_t); 113 112 extern void ipc_call_async_slow(int, sysarg_t, sysarg_t, sysarg_t, sysarg_t, 114 113 sysarg_t, sysarg_t, void *, ipc_async_callback_t);
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