2 Unix SMB/CIFS implementation.
3 Samba internal messaging functions
4 Copyright (C) Andrew Tridgell 2000
5 Copyright (C) 2001 by Martin Pool
6 Copyright (C) 2002 by Jeremy Allison
7 Copyright (C) 2007 by Volker Lendecke
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>.
24 @defgroup messages Internal messaging framework
28 @brief Module for internal messaging between Samba daemons.
30 The idea is that if a part of Samba wants to do communication with
31 another Samba process then it will do a message_register() of a
32 dispatch function, and use message_send_pid() to send messages to
35 The dispatch function is given the pid of the sender, and it can
36 use that to reply by message_send_pid(). See ping_message() for a
39 @caution Dispatch functions must be able to cope with incoming
40 messages on an *odd* byte boundary.
42 This system doesn't have any inherent size limitations but is not
43 very efficient for large messages or when messages are sent in very
49 #include "dbwrap/dbwrap.h"
52 #include "lib/util/tevent_unix.h"
53 #include "lib/background.h"
54 #include "lib/messages_dgm.h"
56 struct messaging_callback {
57 struct messaging_callback *prev, *next;
59 void (*fn)(struct messaging_context *msg, void *private_data,
61 struct server_id server_id, DATA_BLOB *data);
65 struct messaging_context {
67 struct tevent_context *event_ctx;
68 struct messaging_callback *callbacks;
70 struct tevent_req **new_waiters;
71 unsigned num_new_waiters;
73 struct tevent_req **waiters;
76 struct messaging_dgm_context *local;
78 struct messaging_backend *remote;
81 struct messaging_hdr {
87 /****************************************************************************
88 A useful function for testing the message system.
89 ****************************************************************************/
91 static void ping_message(struct messaging_context *msg_ctx,
97 struct server_id_buf idbuf;
99 DEBUG(1, ("INFO: Received PING message from PID %s [%.*s]\n",
100 server_id_str_buf(src, &idbuf), (int)data->length,
101 data->data ? (char *)data->data : ""));
103 messaging_send(msg_ctx, src, MSG_PONG, data);
106 /****************************************************************************
107 Register/replace a dispatch function for a particular message type.
108 JRA changed Dec 13 2006. Only one message handler now permitted per type.
109 *NOTE*: Dispatch functions must be able to cope with incoming
110 messages on an *odd* byte boundary.
111 ****************************************************************************/
114 struct messaging_context *msg_ctx;
122 /****************************************************************************
123 Send one of the messages for the broadcast.
124 ****************************************************************************/
126 static int traverse_fn(struct db_record *rec, const struct server_id *id,
127 uint32_t msg_flags, void *state)
129 struct msg_all *msg_all = (struct msg_all *)state;
132 /* Don't send if the receiver hasn't registered an interest. */
134 if((msg_flags & msg_all->msg_flag) == 0) {
138 /* If the msg send fails because the pid was not found (i.e. smbd died),
139 * the msg has already been deleted from the messages.tdb.*/
141 status = messaging_send_buf(msg_all->msg_ctx, *id, msg_all->msg_type,
142 (const uint8_t *)msg_all->buf, msg_all->len);
144 if (NT_STATUS_EQUAL(status, NT_STATUS_INVALID_HANDLE)) {
145 struct server_id_buf idbuf;
148 * If the pid was not found delete the entry from
152 DEBUG(2, ("pid %s doesn't exist\n",
153 server_id_str_buf(*id, &idbuf)));
155 dbwrap_record_delete(rec);
162 * Send a message to all smbd processes.
164 * It isn't very efficient, but should be OK for the sorts of
165 * applications that use it. When we need efficient broadcast we can add
168 * @param n_sent Set to the number of messages sent. This should be
169 * equal to the number of processes, but be careful for races.
171 * @retval True for success.
173 bool message_send_all(struct messaging_context *msg_ctx,
175 const void *buf, size_t len,
178 struct msg_all msg_all;
180 msg_all.msg_type = msg_type;
181 if (msg_type < 0x100) {
182 msg_all.msg_flag = FLAG_MSG_GENERAL;
183 } else if (msg_type > 0x100 && msg_type < 0x200) {
184 msg_all.msg_flag = FLAG_MSG_NMBD;
185 } else if (msg_type > 0x200 && msg_type < 0x300) {
186 msg_all.msg_flag = FLAG_MSG_PRINT_GENERAL;
187 } else if (msg_type > 0x300 && msg_type < 0x400) {
188 msg_all.msg_flag = FLAG_MSG_SMBD;
189 } else if (msg_type > 0x400 && msg_type < 0x600) {
190 msg_all.msg_flag = FLAG_MSG_WINBIND;
191 } else if (msg_type > 4000 && msg_type < 5000) {
192 msg_all.msg_flag = FLAG_MSG_DBWRAP;
200 msg_all.msg_ctx = msg_ctx;
202 serverid_traverse(traverse_fn, &msg_all);
204 *n_sent = msg_all.n_sent;
208 static void messaging_recv_cb(const uint8_t *msg, size_t msg_len,
211 struct messaging_context *msg_ctx = talloc_get_type_abort(
212 private_data, struct messaging_context);
213 const struct messaging_hdr *hdr;
214 struct server_id_buf idbuf;
215 struct messaging_rec rec;
217 if (msg_len < sizeof(*hdr)) {
218 DEBUG(1, ("message too short: %u\n", (unsigned)msg_len));
223 * messages_dgm guarantees alignment, so we can cast here
225 hdr = (const struct messaging_hdr *)msg;
227 DEBUG(10, ("%s: Received message 0x%x len %u from %s\n", __func__,
228 (unsigned)hdr->msg_type, (unsigned)(msg_len - sizeof(*hdr)),
229 server_id_str_buf(hdr->src, &idbuf)));
231 rec = (struct messaging_rec) {
232 .msg_version = MESSAGE_VERSION,
233 .msg_type = hdr->msg_type,
236 .buf.data = discard_const_p(uint8, msg) + sizeof(*hdr),
237 .buf.length = msg_len - sizeof(*hdr)
240 messaging_dispatch_rec(msg_ctx, &rec);
243 struct messaging_context *messaging_init(TALLOC_CTX *mem_ctx,
244 struct tevent_context *ev)
246 struct messaging_context *ctx;
250 if (!(ctx = talloc_zero(mem_ctx, struct messaging_context))) {
254 ctx->id = procid_self();
259 ret = messaging_dgm_init(ctx, ctx->event_ctx, ctx->id,
260 lp_cache_directory(), sec_initial_uid(),
261 messaging_recv_cb, ctx, &ctx->local);
264 DEBUG(2, ("messaging_dgm_init failed: %s\n", strerror(ret)));
269 if (lp_clustering()) {
270 status = messaging_ctdbd_init(ctx, ctx, &ctx->remote);
272 if (!NT_STATUS_IS_OK(status)) {
273 DEBUG(2, ("messaging_ctdbd_init failed: %s\n",
279 ctx->id.vnn = get_my_vnn();
281 messaging_register(ctx, NULL, MSG_PING, ping_message);
283 /* Register some debugging related messages */
285 register_msg_pool_usage(ctx);
286 register_dmalloc_msgs(ctx);
287 debug_register_msgs(ctx);
292 struct server_id messaging_server_id(const struct messaging_context *msg_ctx)
298 * re-init after a fork
300 NTSTATUS messaging_reinit(struct messaging_context *msg_ctx)
305 TALLOC_FREE(msg_ctx->local);
307 msg_ctx->id = procid_self();
309 ret = messaging_dgm_init(msg_ctx, msg_ctx->event_ctx, msg_ctx->id,
310 lp_cache_directory(), sec_initial_uid(),
311 messaging_recv_cb, msg_ctx,
314 DEBUG(0, ("messaging_dgm_init failed: %s\n", strerror(errno)));
315 return map_nt_error_from_unix(ret);
318 TALLOC_FREE(msg_ctx->remote);
320 if (lp_clustering()) {
321 status = messaging_ctdbd_init(msg_ctx, msg_ctx,
324 if (!NT_STATUS_IS_OK(status)) {
325 DEBUG(1, ("messaging_ctdbd_init failed: %s\n",
336 * Register a dispatch function for a particular message type. Allow multiple
339 NTSTATUS messaging_register(struct messaging_context *msg_ctx,
342 void (*fn)(struct messaging_context *msg,
345 struct server_id server_id,
348 struct messaging_callback *cb;
350 DEBUG(5, ("Registering messaging pointer for type %u - "
352 (unsigned)msg_type, private_data));
355 * Only one callback per type
358 for (cb = msg_ctx->callbacks; cb != NULL; cb = cb->next) {
359 /* we allow a second registration of the same message
360 type if it has a different private pointer. This is
361 needed in, for example, the internal notify code,
362 which creates a new notify context for each tree
363 connect, and expects to receive messages to each of
365 if (cb->msg_type == msg_type && private_data == cb->private_data) {
366 DEBUG(5,("Overriding messaging pointer for type %u - private_data=%p\n",
367 (unsigned)msg_type, private_data));
369 cb->private_data = private_data;
374 if (!(cb = talloc(msg_ctx, struct messaging_callback))) {
375 return NT_STATUS_NO_MEMORY;
378 cb->msg_type = msg_type;
380 cb->private_data = private_data;
382 DLIST_ADD(msg_ctx->callbacks, cb);
387 De-register the function for a particular message type.
389 void messaging_deregister(struct messaging_context *ctx, uint32_t msg_type,
392 struct messaging_callback *cb, *next;
394 for (cb = ctx->callbacks; cb; cb = next) {
396 if ((cb->msg_type == msg_type)
397 && (cb->private_data == private_data)) {
398 DEBUG(5,("Deregistering messaging pointer for type %u - private_data=%p\n",
399 (unsigned)msg_type, private_data));
400 DLIST_REMOVE(ctx->callbacks, cb);
407 Send a message to a particular server
409 NTSTATUS messaging_send(struct messaging_context *msg_ctx,
410 struct server_id server, uint32_t msg_type,
411 const DATA_BLOB *data)
415 iov.iov_base = data->data;
416 iov.iov_len = data->length;
418 return messaging_send_iov(msg_ctx, server, msg_type, &iov, 1);
421 NTSTATUS messaging_send_buf(struct messaging_context *msg_ctx,
422 struct server_id server, uint32_t msg_type,
423 const uint8_t *buf, size_t len)
425 DATA_BLOB blob = data_blob_const(buf, len);
426 return messaging_send(msg_ctx, server, msg_type, &blob);
429 NTSTATUS messaging_send_iov(struct messaging_context *msg_ctx,
430 struct server_id server, uint32_t msg_type,
431 const struct iovec *iov, int iovlen)
434 struct messaging_hdr hdr;
435 struct iovec iov2[iovlen+1];
437 if (server_id_is_disconnected(&server)) {
438 return NT_STATUS_INVALID_PARAMETER_MIX;
441 if (!procid_is_local(&server)) {
442 ret = msg_ctx->remote->send_fn(msg_ctx->id, server,
443 msg_type, iov, iovlen,
446 return map_nt_error_from_unix(ret);
451 if (server_id_same_process(&msg_ctx->id, &server)) {
452 struct messaging_rec rec;
456 * Self-send, directly dispatch
459 buf = iov_buf(talloc_tos(), iov, iovlen);
461 return NT_STATUS_NO_MEMORY;
464 rec.msg_version = MESSAGE_VERSION;
465 rec.msg_type = msg_type & MSG_TYPE_MASK;
467 rec.src = msg_ctx->id;
468 rec.buf = data_blob_const(buf, talloc_get_size(buf));
469 messaging_dispatch_rec(msg_ctx, &rec);
474 hdr = (struct messaging_hdr) {
475 .msg_type = msg_type,
479 iov2[0] = (struct iovec){ .iov_base = &hdr, .iov_len = sizeof(hdr) };
480 memcpy(&iov2[1], iov, iovlen * sizeof(*iov));
483 ret = messaging_dgm_send(msg_ctx->local, server.pid, iov2, iovlen+1);
487 return map_nt_error_from_unix(ret);
492 static struct messaging_rec *messaging_rec_dup(TALLOC_CTX *mem_ctx,
493 struct messaging_rec *rec)
495 struct messaging_rec *result;
497 result = talloc_pooled_object(mem_ctx, struct messaging_rec,
499 if (result == NULL) {
504 /* Doesn't fail, see talloc_pooled_object */
506 result->buf.data = talloc_memdup(result, rec->buf.data,
511 struct messaging_filtered_read_state {
512 struct tevent_context *ev;
513 struct messaging_context *msg_ctx;
516 bool (*filter)(struct messaging_rec *rec, void *private_data);
519 struct messaging_rec *rec;
522 static void messaging_filtered_read_cleanup(struct tevent_req *req,
523 enum tevent_req_state req_state);
525 struct tevent_req *messaging_filtered_read_send(
526 TALLOC_CTX *mem_ctx, struct tevent_context *ev,
527 struct messaging_context *msg_ctx,
528 bool (*filter)(struct messaging_rec *rec, void *private_data),
531 struct tevent_req *req;
532 struct messaging_filtered_read_state *state;
533 size_t new_waiters_len;
535 req = tevent_req_create(mem_ctx, &state,
536 struct messaging_filtered_read_state);
541 state->msg_ctx = msg_ctx;
542 state->filter = filter;
543 state->private_data = private_data;
546 * We have to defer the callback here, as we might be called from
547 * within a different tevent_context than state->ev
549 tevent_req_defer_callback(req, state->ev);
551 state->tevent_handle = messaging_dgm_register_tevent_context(
552 state, msg_ctx->local, ev);
553 if (tevent_req_nomem(state, req)) {
554 return tevent_req_post(req, ev);
558 * We add ourselves to the "new_waiters" array, not the "waiters"
559 * array. If we are called from within messaging_read_done,
560 * messaging_dispatch_rec will be in an active for-loop on
561 * "waiters". We must be careful not to mess with this array, because
562 * it could mean that a single event is being delivered twice.
565 new_waiters_len = talloc_array_length(msg_ctx->new_waiters);
567 if (new_waiters_len == msg_ctx->num_new_waiters) {
568 struct tevent_req **tmp;
570 tmp = talloc_realloc(msg_ctx, msg_ctx->new_waiters,
571 struct tevent_req *, new_waiters_len+1);
572 if (tevent_req_nomem(tmp, req)) {
573 return tevent_req_post(req, ev);
575 msg_ctx->new_waiters = tmp;
578 msg_ctx->new_waiters[msg_ctx->num_new_waiters] = req;
579 msg_ctx->num_new_waiters += 1;
580 tevent_req_set_cleanup_fn(req, messaging_filtered_read_cleanup);
585 static void messaging_filtered_read_cleanup(struct tevent_req *req,
586 enum tevent_req_state req_state)
588 struct messaging_filtered_read_state *state = tevent_req_data(
589 req, struct messaging_filtered_read_state);
590 struct messaging_context *msg_ctx = state->msg_ctx;
593 tevent_req_set_cleanup_fn(req, NULL);
595 TALLOC_FREE(state->tevent_handle);
598 * Just set the [new_]waiters entry to NULL, be careful not to mess
599 * with the other "waiters" array contents. We are often called from
600 * within "messaging_dispatch_rec", which loops over
601 * "waiters". Messing with the "waiters" array will mess up that
605 for (i=0; i<msg_ctx->num_waiters; i++) {
606 if (msg_ctx->waiters[i] == req) {
607 msg_ctx->waiters[i] = NULL;
612 for (i=0; i<msg_ctx->num_new_waiters; i++) {
613 if (msg_ctx->new_waiters[i] == req) {
614 msg_ctx->new_waiters[i] = NULL;
620 static void messaging_filtered_read_done(struct tevent_req *req,
621 struct messaging_rec *rec)
623 struct messaging_filtered_read_state *state = tevent_req_data(
624 req, struct messaging_filtered_read_state);
626 state->rec = messaging_rec_dup(state, rec);
627 if (tevent_req_nomem(state->rec, req)) {
630 tevent_req_done(req);
633 int messaging_filtered_read_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
634 struct messaging_rec **presult)
636 struct messaging_filtered_read_state *state = tevent_req_data(
637 req, struct messaging_filtered_read_state);
640 if (tevent_req_is_unix_error(req, &err)) {
641 tevent_req_received(req);
644 *presult = talloc_move(mem_ctx, &state->rec);
648 struct messaging_read_state {
650 struct messaging_rec *rec;
653 static bool messaging_read_filter(struct messaging_rec *rec,
655 static void messaging_read_done(struct tevent_req *subreq);
657 struct tevent_req *messaging_read_send(TALLOC_CTX *mem_ctx,
658 struct tevent_context *ev,
659 struct messaging_context *msg,
662 struct tevent_req *req, *subreq;
663 struct messaging_read_state *state;
665 req = tevent_req_create(mem_ctx, &state,
666 struct messaging_read_state);
670 state->msg_type = msg_type;
672 subreq = messaging_filtered_read_send(state, ev, msg,
673 messaging_read_filter, state);
674 if (tevent_req_nomem(subreq, req)) {
675 return tevent_req_post(req, ev);
677 tevent_req_set_callback(subreq, messaging_read_done, req);
681 static bool messaging_read_filter(struct messaging_rec *rec,
684 struct messaging_read_state *state = talloc_get_type_abort(
685 private_data, struct messaging_read_state);
687 return rec->msg_type == state->msg_type;
690 static void messaging_read_done(struct tevent_req *subreq)
692 struct tevent_req *req = tevent_req_callback_data(
693 subreq, struct tevent_req);
694 struct messaging_read_state *state = tevent_req_data(
695 req, struct messaging_read_state);
698 ret = messaging_filtered_read_recv(subreq, state, &state->rec);
700 if (tevent_req_error(req, ret)) {
703 tevent_req_done(req);
706 int messaging_read_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
707 struct messaging_rec **presult)
709 struct messaging_read_state *state = tevent_req_data(
710 req, struct messaging_read_state);
713 if (tevent_req_is_unix_error(req, &err)) {
716 if (presult != NULL) {
717 *presult = talloc_move(mem_ctx, &state->rec);
722 static bool messaging_append_new_waiters(struct messaging_context *msg_ctx)
724 if (msg_ctx->num_new_waiters == 0) {
728 if (talloc_array_length(msg_ctx->waiters) <
729 (msg_ctx->num_waiters + msg_ctx->num_new_waiters)) {
730 struct tevent_req **tmp;
731 tmp = talloc_realloc(
732 msg_ctx, msg_ctx->waiters, struct tevent_req *,
733 msg_ctx->num_waiters + msg_ctx->num_new_waiters);
735 DEBUG(1, ("%s: talloc failed\n", __func__));
738 msg_ctx->waiters = tmp;
741 memcpy(&msg_ctx->waiters[msg_ctx->num_waiters], msg_ctx->new_waiters,
742 sizeof(struct tevent_req *) * msg_ctx->num_new_waiters);
744 msg_ctx->num_waiters += msg_ctx->num_new_waiters;
745 msg_ctx->num_new_waiters = 0;
750 struct messaging_defer_callback_state {
751 struct messaging_context *msg_ctx;
752 struct messaging_rec *rec;
753 void (*fn)(struct messaging_context *msg, void *private_data,
754 uint32_t msg_type, struct server_id server_id,
759 static void messaging_defer_callback_trigger(struct tevent_context *ev,
760 struct tevent_immediate *im,
763 static void messaging_defer_callback(
764 struct messaging_context *msg_ctx, struct messaging_rec *rec,
765 void (*fn)(struct messaging_context *msg, void *private_data,
766 uint32_t msg_type, struct server_id server_id,
770 struct messaging_defer_callback_state *state;
771 struct tevent_immediate *im;
773 state = talloc(msg_ctx, struct messaging_defer_callback_state);
775 DEBUG(1, ("talloc failed\n"));
778 state->msg_ctx = msg_ctx;
780 state->private_data = private_data;
782 state->rec = messaging_rec_dup(state, rec);
783 if (state->rec == NULL) {
784 DEBUG(1, ("talloc failed\n"));
789 im = tevent_create_immediate(state);
791 DEBUG(1, ("tevent_create_immediate failed\n"));
795 tevent_schedule_immediate(im, msg_ctx->event_ctx,
796 messaging_defer_callback_trigger, state);
799 static void messaging_defer_callback_trigger(struct tevent_context *ev,
800 struct tevent_immediate *im,
803 struct messaging_defer_callback_state *state = talloc_get_type_abort(
804 private_data, struct messaging_defer_callback_state);
805 struct messaging_rec *rec = state->rec;
807 state->fn(state->msg_ctx, state->private_data, rec->msg_type, rec->src,
813 Dispatch one messaging_rec
815 void messaging_dispatch_rec(struct messaging_context *msg_ctx,
816 struct messaging_rec *rec)
818 struct messaging_callback *cb, *next;
821 for (cb = msg_ctx->callbacks; cb != NULL; cb = next) {
823 if (cb->msg_type != rec->msg_type) {
827 if (server_id_same_process(&rec->src, &rec->dest)) {
829 * This is a self-send. We are called here from
830 * messaging_send(), and we don't want to directly
831 * recurse into the callback but go via a
834 messaging_defer_callback(msg_ctx, rec, cb->fn,
838 * This comes from a different process. we are called
839 * from the event loop, so we should call back
842 cb->fn(msg_ctx, cb->private_data, rec->msg_type,
843 rec->src, &rec->buf);
846 * we continue looking for matching messages after finding
847 * one. This matters for subsystems like the internal notify
848 * code which register more than one handler for the same
853 if (!messaging_append_new_waiters(msg_ctx)) {
858 while (i < msg_ctx->num_waiters) {
859 struct tevent_req *req;
860 struct messaging_filtered_read_state *state;
862 req = msg_ctx->waiters[i];
865 * This got cleaned up. In the meantime,
866 * move everything down one. We need
867 * to keep the order of waiters, as
868 * other code may depend on this.
870 if (i < msg_ctx->num_waiters - 1) {
871 memmove(&msg_ctx->waiters[i],
872 &msg_ctx->waiters[i+1],
873 sizeof(struct tevent_req *) *
874 (msg_ctx->num_waiters - i - 1));
876 msg_ctx->num_waiters -= 1;
880 state = tevent_req_data(
881 req, struct messaging_filtered_read_state);
882 if (state->filter(rec, state->private_data)) {
883 messaging_filtered_read_done(req, rec);
890 static int mess_parent_dgm_cleanup(void *private_data);
891 static void mess_parent_dgm_cleanup_done(struct tevent_req *req);
893 bool messaging_parent_dgm_cleanup_init(struct messaging_context *msg)
895 struct tevent_req *req;
897 req = background_job_send(
898 msg, msg->event_ctx, msg, NULL, 0,
899 lp_parm_int(-1, "messaging", "messaging dgm cleanup interval",
901 mess_parent_dgm_cleanup, msg);
905 tevent_req_set_callback(req, mess_parent_dgm_cleanup_done, msg);
909 static int mess_parent_dgm_cleanup(void *private_data)
911 struct messaging_context *msg_ctx = talloc_get_type_abort(
912 private_data, struct messaging_context);
915 ret = messaging_dgm_wipe(msg_ctx->local);
916 DEBUG(10, ("messaging_dgm_wipe returned %s\n",
917 ret ? strerror(ret) : "ok"));
918 return lp_parm_int(-1, "messaging", "messaging dgm cleanup interval",
922 static void mess_parent_dgm_cleanup_done(struct tevent_req *req)
924 struct messaging_context *msg = tevent_req_callback_data(
925 req, struct messaging_context);
928 status = background_job_recv(req);
930 DEBUG(1, ("messaging dgm cleanup job ended with %s\n",
933 req = background_job_send(
934 msg, msg->event_ctx, msg, NULL, 0,
935 lp_parm_int(-1, "messaging", "messaging dgm cleanup interval",
937 mess_parent_dgm_cleanup, msg);
939 DEBUG(1, ("background_job_send failed\n"));
941 tevent_req_set_callback(req, mess_parent_dgm_cleanup_done, msg);
944 int messaging_cleanup(struct messaging_context *msg_ctx, pid_t pid)
949 ret = messaging_dgm_wipe(msg_ctx->local);
951 ret = messaging_dgm_cleanup(msg_ctx->local, pid);
957 struct tevent_context *messaging_tevent_context(
958 struct messaging_context *msg_ctx)
960 return msg_ctx->event_ctx;