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"
55 #include "lib/util/iov_buf.h"
56 #include "lib/util/server_id_db.h"
57 #include "lib/messages_dgm_ref.h"
58 #include "lib/messages_util.h"
60 struct messaging_callback {
61 struct messaging_callback *prev, *next;
63 void (*fn)(struct messaging_context *msg, void *private_data,
65 struct server_id server_id, DATA_BLOB *data);
69 struct messaging_context {
71 struct tevent_context *event_ctx;
72 struct messaging_callback *callbacks;
74 struct tevent_req **new_waiters;
75 unsigned num_new_waiters;
77 struct tevent_req **waiters;
81 struct messaging_backend *remote;
83 struct server_id_db *names_db;
86 static void messaging_dispatch_rec(struct messaging_context *msg_ctx,
87 struct messaging_rec *rec);
89 /****************************************************************************
90 A useful function for testing the message system.
91 ****************************************************************************/
93 static void ping_message(struct messaging_context *msg_ctx,
99 struct server_id_buf idbuf;
101 DEBUG(1, ("INFO: Received PING message from PID %s [%.*s]\n",
102 server_id_str_buf(src, &idbuf), (int)data->length,
103 data->data ? (char *)data->data : ""));
105 messaging_send(msg_ctx, src, MSG_PONG, data);
108 /****************************************************************************
109 Register/replace a dispatch function for a particular message type.
110 JRA changed Dec 13 2006. Only one message handler now permitted per type.
111 *NOTE*: Dispatch functions must be able to cope with incoming
112 messages on an *odd* byte boundary.
113 ****************************************************************************/
116 struct messaging_context *msg_ctx;
124 /****************************************************************************
125 Send one of the messages for the broadcast.
126 ****************************************************************************/
128 static int traverse_fn(struct db_record *rec, const struct server_id *id,
129 uint32_t msg_flags, void *state)
131 struct msg_all *msg_all = (struct msg_all *)state;
134 /* Don't send if the receiver hasn't registered an interest. */
136 if((msg_flags & msg_all->msg_flag) == 0) {
140 /* If the msg send fails because the pid was not found (i.e. smbd died),
141 * the msg has already been deleted from the messages.tdb.*/
143 status = messaging_send_buf(msg_all->msg_ctx, *id, msg_all->msg_type,
144 (const uint8_t *)msg_all->buf, msg_all->len);
146 if (NT_STATUS_EQUAL(status, NT_STATUS_INVALID_HANDLE)) {
147 struct server_id_buf idbuf;
150 * If the pid was not found delete the entry from
154 DEBUG(2, ("pid %s doesn't exist\n",
155 server_id_str_buf(*id, &idbuf)));
157 dbwrap_record_delete(rec);
164 * Send a message to all smbd processes.
166 * It isn't very efficient, but should be OK for the sorts of
167 * applications that use it. When we need efficient broadcast we can add
170 * @param n_sent Set to the number of messages sent. This should be
171 * equal to the number of processes, but be careful for races.
173 * @retval True for success.
175 bool message_send_all(struct messaging_context *msg_ctx,
177 const void *buf, size_t len,
180 struct msg_all msg_all;
182 msg_all.msg_type = msg_type;
183 if (msg_type < 0x100) {
184 msg_all.msg_flag = FLAG_MSG_GENERAL;
185 } else if (msg_type > 0x100 && msg_type < 0x200) {
186 msg_all.msg_flag = FLAG_MSG_NMBD;
187 } else if (msg_type > 0x200 && msg_type < 0x300) {
188 msg_all.msg_flag = FLAG_MSG_PRINT_GENERAL;
189 } else if (msg_type > 0x300 && msg_type < 0x400) {
190 msg_all.msg_flag = FLAG_MSG_SMBD;
191 } else if (msg_type > 0x400 && msg_type < 0x600) {
192 msg_all.msg_flag = FLAG_MSG_WINBIND;
193 } else if (msg_type > 4000 && msg_type < 5000) {
194 msg_all.msg_flag = FLAG_MSG_DBWRAP;
202 msg_all.msg_ctx = msg_ctx;
204 serverid_traverse(traverse_fn, &msg_all);
206 *n_sent = msg_all.n_sent;
210 static void messaging_recv_cb(const uint8_t *msg, size_t msg_len,
211 int *fds, size_t num_fds,
214 struct messaging_context *msg_ctx = talloc_get_type_abort(
215 private_data, struct messaging_context);
216 struct server_id_buf idbuf;
217 struct messaging_rec rec;
218 int64_t fds64[MIN(num_fds, INT8_MAX)];
221 if (msg_len < MESSAGE_HDR_LENGTH) {
222 DEBUG(1, ("message too short: %u\n", (unsigned)msg_len));
226 if (num_fds > INT8_MAX) {
227 DEBUG(1, ("too many fds: %u\n", (unsigned)num_fds));
232 * "consume" the fds by copying them and setting
233 * the original variable to -1
235 for (i=0; i < num_fds; i++) {
240 rec = (struct messaging_rec) {
241 .msg_version = MESSAGE_VERSION,
242 .buf.data = discard_const_p(uint8_t, msg) + MESSAGE_HDR_LENGTH,
243 .buf.length = msg_len - MESSAGE_HDR_LENGTH,
248 message_hdr_get(&rec.msg_type, &rec.src, &rec.dest, msg);
250 DEBUG(10, ("%s: Received message 0x%x len %u (num_fds:%u) from %s\n",
251 __func__, (unsigned)rec.msg_type,
252 (unsigned)rec.buf.length,
254 server_id_str_buf(rec.src, &idbuf)));
256 messaging_dispatch_rec(msg_ctx, &rec);
260 for (i=0; i < num_fds; i++) {
265 static int messaging_context_destructor(struct messaging_context *ctx)
269 for (i=0; i<ctx->num_new_waiters; i++) {
270 if (ctx->new_waiters[i] != NULL) {
271 tevent_req_set_cleanup_fn(ctx->new_waiters[i], NULL);
272 ctx->new_waiters[i] = NULL;
275 for (i=0; i<ctx->num_waiters; i++) {
276 if (ctx->waiters[i] != NULL) {
277 tevent_req_set_cleanup_fn(ctx->waiters[i], NULL);
278 ctx->waiters[i] = NULL;
285 static const char *private_path(const char *name)
287 return talloc_asprintf(talloc_tos(), "%s/%s", lp_private_dir(), name);
290 struct messaging_context *messaging_init(TALLOC_CTX *mem_ctx,
291 struct tevent_context *ev)
293 struct messaging_context *ctx;
295 const char *lck_path;
296 const char *priv_path;
299 if (!(ctx = talloc_zero(mem_ctx, struct messaging_context))) {
303 ctx->id = (struct server_id) {
304 .pid = getpid(), .vnn = NONCLUSTER_VNN
311 lck_path = lock_path("msg.lock");
312 if (lck_path == NULL) {
317 ok = directory_create_or_exist_strict(lck_path, sec_initial_uid(),
320 DEBUG(10, ("%s: Could not create lock directory: %s\n",
321 __func__, strerror(errno)));
326 priv_path = private_path("msg.sock");
327 if (priv_path == NULL) {
332 ok = directory_create_or_exist_strict(priv_path, sec_initial_uid(),
335 DEBUG(10, ("%s: Could not create msg directory: %s\n",
336 __func__, strerror(errno)));
341 ctx->msg_dgm_ref = messaging_dgm_ref(
342 ctx, ctx->event_ctx, &ctx->id.unique_id,
343 priv_path, lck_path, messaging_recv_cb, ctx, &ret);
345 if (ctx->msg_dgm_ref == NULL) {
346 DEBUG(2, ("messaging_dgm_ref failed: %s\n", strerror(ret)));
351 talloc_set_destructor(ctx, messaging_context_destructor);
353 if (lp_clustering()) {
354 ret = messaging_ctdbd_init(ctx, ctx, &ctx->remote);
357 DEBUG(2, ("messaging_ctdbd_init failed: %s\n",
363 ctx->id.vnn = get_my_vnn();
365 ctx->names_db = server_id_db_init(
366 ctx, ctx->id, lp_lock_directory(), 0,
367 TDB_INCOMPATIBLE_HASH|TDB_CLEAR_IF_FIRST);
368 if (ctx->names_db == NULL) {
369 DEBUG(10, ("%s: server_id_db_init failed\n", __func__));
374 messaging_register(ctx, NULL, MSG_PING, ping_message);
376 /* Register some debugging related messages */
378 register_msg_pool_usage(ctx);
379 register_dmalloc_msgs(ctx);
380 debug_register_msgs(ctx);
385 struct server_id messaging_server_id(const struct messaging_context *msg_ctx)
391 * re-init after a fork
393 NTSTATUS messaging_reinit(struct messaging_context *msg_ctx)
397 TALLOC_FREE(msg_ctx->msg_dgm_ref);
399 msg_ctx->id = (struct server_id) {
400 .pid = getpid(), .vnn = msg_ctx->id.vnn
403 msg_ctx->msg_dgm_ref = messaging_dgm_ref(
404 msg_ctx, msg_ctx->event_ctx, &msg_ctx->id.unique_id,
405 private_path("msg.sock"), lock_path("msg.lock"),
406 messaging_recv_cb, msg_ctx, &ret);
408 if (msg_ctx->msg_dgm_ref == NULL) {
409 DEBUG(2, ("messaging_dgm_ref failed: %s\n", strerror(ret)));
410 return map_nt_error_from_unix(ret);
413 TALLOC_FREE(msg_ctx->remote);
415 if (lp_clustering()) {
416 ret = messaging_ctdbd_init(msg_ctx, msg_ctx,
420 DEBUG(1, ("messaging_ctdbd_init failed: %s\n",
422 return map_nt_error_from_unix(ret);
426 server_id_db_reinit(msg_ctx->names_db, msg_ctx->id);
433 * Register a dispatch function for a particular message type. Allow multiple
436 NTSTATUS messaging_register(struct messaging_context *msg_ctx,
439 void (*fn)(struct messaging_context *msg,
442 struct server_id server_id,
445 struct messaging_callback *cb;
447 DEBUG(5, ("Registering messaging pointer for type %u - "
449 (unsigned)msg_type, private_data));
452 * Only one callback per type
455 for (cb = msg_ctx->callbacks; cb != NULL; cb = cb->next) {
456 /* we allow a second registration of the same message
457 type if it has a different private pointer. This is
458 needed in, for example, the internal notify code,
459 which creates a new notify context for each tree
460 connect, and expects to receive messages to each of
462 if (cb->msg_type == msg_type && private_data == cb->private_data) {
463 DEBUG(5,("Overriding messaging pointer for type %u - private_data=%p\n",
464 (unsigned)msg_type, private_data));
466 cb->private_data = private_data;
471 if (!(cb = talloc(msg_ctx, struct messaging_callback))) {
472 return NT_STATUS_NO_MEMORY;
475 cb->msg_type = msg_type;
477 cb->private_data = private_data;
479 DLIST_ADD(msg_ctx->callbacks, cb);
484 De-register the function for a particular message type.
486 void messaging_deregister(struct messaging_context *ctx, uint32_t msg_type,
489 struct messaging_callback *cb, *next;
491 for (cb = ctx->callbacks; cb; cb = next) {
493 if ((cb->msg_type == msg_type)
494 && (cb->private_data == private_data)) {
495 DEBUG(5,("Deregistering messaging pointer for type %u - private_data=%p\n",
496 (unsigned)msg_type, private_data));
497 DLIST_REMOVE(ctx->callbacks, cb);
504 Send a message to a particular server
506 NTSTATUS messaging_send(struct messaging_context *msg_ctx,
507 struct server_id server, uint32_t msg_type,
508 const DATA_BLOB *data)
512 iov.iov_base = data->data;
513 iov.iov_len = data->length;
515 return messaging_send_iov(msg_ctx, server, msg_type, &iov, 1, NULL, 0);
518 NTSTATUS messaging_send_buf(struct messaging_context *msg_ctx,
519 struct server_id server, uint32_t msg_type,
520 const uint8_t *buf, size_t len)
522 DATA_BLOB blob = data_blob_const(buf, len);
523 return messaging_send(msg_ctx, server, msg_type, &blob);
526 int messaging_send_iov_from(struct messaging_context *msg_ctx,
527 struct server_id src, struct server_id dst,
529 const struct iovec *iov, int iovlen,
530 const int *fds, size_t num_fds)
533 uint8_t hdr[MESSAGE_HDR_LENGTH];
534 struct iovec iov2[iovlen+1];
536 if (server_id_is_disconnected(&dst)) {
540 if (num_fds > INT8_MAX) {
544 if (!procid_is_local(&dst)) {
549 ret = msg_ctx->remote->send_fn(src, dst,
550 msg_type, iov, iovlen,
556 message_hdr_put(hdr, msg_type, src, dst);
557 iov2[0] = (struct iovec){ .iov_base = hdr, .iov_len = sizeof(hdr) };
558 memcpy(&iov2[1], iov, iovlen * sizeof(*iov));
561 ret = messaging_dgm_send(dst.pid, iov2, iovlen+1, fds, num_fds);
567 NTSTATUS messaging_send_iov(struct messaging_context *msg_ctx,
568 struct server_id dst, uint32_t msg_type,
569 const struct iovec *iov, int iovlen,
570 const int *fds, size_t num_fds)
574 ret = messaging_send_iov_from(msg_ctx, msg_ctx->id, dst, msg_type,
575 iov, iovlen, fds, num_fds);
577 return map_nt_error_from_unix(ret);
582 static struct messaging_rec *messaging_rec_dup(TALLOC_CTX *mem_ctx,
583 struct messaging_rec *rec)
585 struct messaging_rec *result;
586 size_t fds_size = sizeof(int64_t) * rec->num_fds;
588 result = talloc_pooled_object(mem_ctx, struct messaging_rec, 2,
589 rec->buf.length + fds_size);
590 if (result == NULL) {
595 /* Doesn't fail, see talloc_pooled_object */
597 result->buf.data = talloc_memdup(result, rec->buf.data,
601 if (result->num_fds > 0) {
602 result->fds = talloc_memdup(result, rec->fds, fds_size);
608 struct messaging_filtered_read_state {
609 struct tevent_context *ev;
610 struct messaging_context *msg_ctx;
613 bool (*filter)(struct messaging_rec *rec, void *private_data);
616 struct messaging_rec *rec;
619 static void messaging_filtered_read_cleanup(struct tevent_req *req,
620 enum tevent_req_state req_state);
622 struct tevent_req *messaging_filtered_read_send(
623 TALLOC_CTX *mem_ctx, struct tevent_context *ev,
624 struct messaging_context *msg_ctx,
625 bool (*filter)(struct messaging_rec *rec, void *private_data),
628 struct tevent_req *req;
629 struct messaging_filtered_read_state *state;
630 size_t new_waiters_len;
632 req = tevent_req_create(mem_ctx, &state,
633 struct messaging_filtered_read_state);
638 state->msg_ctx = msg_ctx;
639 state->filter = filter;
640 state->private_data = private_data;
643 * We have to defer the callback here, as we might be called from
644 * within a different tevent_context than state->ev
646 tevent_req_defer_callback(req, state->ev);
648 state->tevent_handle = messaging_dgm_register_tevent_context(
650 if (tevent_req_nomem(state->tevent_handle, req)) {
651 return tevent_req_post(req, ev);
655 * We add ourselves to the "new_waiters" array, not the "waiters"
656 * array. If we are called from within messaging_read_done,
657 * messaging_dispatch_rec will be in an active for-loop on
658 * "waiters". We must be careful not to mess with this array, because
659 * it could mean that a single event is being delivered twice.
662 new_waiters_len = talloc_array_length(msg_ctx->new_waiters);
664 if (new_waiters_len == msg_ctx->num_new_waiters) {
665 struct tevent_req **tmp;
667 tmp = talloc_realloc(msg_ctx, msg_ctx->new_waiters,
668 struct tevent_req *, new_waiters_len+1);
669 if (tevent_req_nomem(tmp, req)) {
670 return tevent_req_post(req, ev);
672 msg_ctx->new_waiters = tmp;
675 msg_ctx->new_waiters[msg_ctx->num_new_waiters] = req;
676 msg_ctx->num_new_waiters += 1;
677 tevent_req_set_cleanup_fn(req, messaging_filtered_read_cleanup);
682 static void messaging_filtered_read_cleanup(struct tevent_req *req,
683 enum tevent_req_state req_state)
685 struct messaging_filtered_read_state *state = tevent_req_data(
686 req, struct messaging_filtered_read_state);
687 struct messaging_context *msg_ctx = state->msg_ctx;
690 tevent_req_set_cleanup_fn(req, NULL);
692 TALLOC_FREE(state->tevent_handle);
695 * Just set the [new_]waiters entry to NULL, be careful not to mess
696 * with the other "waiters" array contents. We are often called from
697 * within "messaging_dispatch_rec", which loops over
698 * "waiters". Messing with the "waiters" array will mess up that
702 for (i=0; i<msg_ctx->num_waiters; i++) {
703 if (msg_ctx->waiters[i] == req) {
704 msg_ctx->waiters[i] = NULL;
709 for (i=0; i<msg_ctx->num_new_waiters; i++) {
710 if (msg_ctx->new_waiters[i] == req) {
711 msg_ctx->new_waiters[i] = NULL;
717 static void messaging_filtered_read_done(struct tevent_req *req,
718 struct messaging_rec *rec)
720 struct messaging_filtered_read_state *state = tevent_req_data(
721 req, struct messaging_filtered_read_state);
723 state->rec = messaging_rec_dup(state, rec);
724 if (tevent_req_nomem(state->rec, req)) {
727 tevent_req_done(req);
730 int messaging_filtered_read_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
731 struct messaging_rec **presult)
733 struct messaging_filtered_read_state *state = tevent_req_data(
734 req, struct messaging_filtered_read_state);
737 if (tevent_req_is_unix_error(req, &err)) {
738 tevent_req_received(req);
741 *presult = talloc_move(mem_ctx, &state->rec);
745 struct messaging_read_state {
747 struct messaging_rec *rec;
750 static bool messaging_read_filter(struct messaging_rec *rec,
752 static void messaging_read_done(struct tevent_req *subreq);
754 struct tevent_req *messaging_read_send(TALLOC_CTX *mem_ctx,
755 struct tevent_context *ev,
756 struct messaging_context *msg,
759 struct tevent_req *req, *subreq;
760 struct messaging_read_state *state;
762 req = tevent_req_create(mem_ctx, &state,
763 struct messaging_read_state);
767 state->msg_type = msg_type;
769 subreq = messaging_filtered_read_send(state, ev, msg,
770 messaging_read_filter, state);
771 if (tevent_req_nomem(subreq, req)) {
772 return tevent_req_post(req, ev);
774 tevent_req_set_callback(subreq, messaging_read_done, req);
778 static bool messaging_read_filter(struct messaging_rec *rec,
781 struct messaging_read_state *state = talloc_get_type_abort(
782 private_data, struct messaging_read_state);
784 if (rec->num_fds != 0) {
788 return rec->msg_type == state->msg_type;
791 static void messaging_read_done(struct tevent_req *subreq)
793 struct tevent_req *req = tevent_req_callback_data(
794 subreq, struct tevent_req);
795 struct messaging_read_state *state = tevent_req_data(
796 req, struct messaging_read_state);
799 ret = messaging_filtered_read_recv(subreq, state, &state->rec);
801 if (tevent_req_error(req, ret)) {
804 tevent_req_done(req);
807 int messaging_read_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
808 struct messaging_rec **presult)
810 struct messaging_read_state *state = tevent_req_data(
811 req, struct messaging_read_state);
814 if (tevent_req_is_unix_error(req, &err)) {
817 if (presult != NULL) {
818 *presult = talloc_move(mem_ctx, &state->rec);
823 struct messaging_handler_state {
824 struct tevent_context *ev;
825 struct messaging_context *msg_ctx;
827 bool (*handler)(struct messaging_context *msg_ctx,
828 struct messaging_rec **rec, void *private_data);
832 static void messaging_handler_got_msg(struct tevent_req *subreq);
834 struct tevent_req *messaging_handler_send(
835 TALLOC_CTX *mem_ctx, struct tevent_context *ev,
836 struct messaging_context *msg_ctx, uint32_t msg_type,
837 bool (*handler)(struct messaging_context *msg_ctx,
838 struct messaging_rec **rec, void *private_data),
841 struct tevent_req *req, *subreq;
842 struct messaging_handler_state *state;
844 req = tevent_req_create(mem_ctx, &state,
845 struct messaging_handler_state);
850 state->msg_ctx = msg_ctx;
851 state->msg_type = msg_type;
852 state->handler = handler;
853 state->private_data = private_data;
855 subreq = messaging_read_send(state, state->ev, state->msg_ctx,
857 if (tevent_req_nomem(subreq, req)) {
858 return tevent_req_post(req, ev);
860 tevent_req_set_callback(subreq, messaging_handler_got_msg, req);
864 static void messaging_handler_got_msg(struct tevent_req *subreq)
866 struct tevent_req *req = tevent_req_callback_data(
867 subreq, struct tevent_req);
868 struct messaging_handler_state *state = tevent_req_data(
869 req, struct messaging_handler_state);
870 struct messaging_rec *rec;
874 ret = messaging_read_recv(subreq, state, &rec);
876 if (tevent_req_error(req, ret)) {
880 subreq = messaging_read_send(state, state->ev, state->msg_ctx,
882 if (tevent_req_nomem(subreq, req)) {
885 tevent_req_set_callback(subreq, messaging_handler_got_msg, req);
887 ok = state->handler(state->msg_ctx, &rec, state->private_data);
896 tevent_req_done(req);
899 int messaging_handler_recv(struct tevent_req *req)
901 return tevent_req_simple_recv_unix(req);
904 static bool messaging_append_new_waiters(struct messaging_context *msg_ctx)
906 if (msg_ctx->num_new_waiters == 0) {
910 if (talloc_array_length(msg_ctx->waiters) <
911 (msg_ctx->num_waiters + msg_ctx->num_new_waiters)) {
912 struct tevent_req **tmp;
913 tmp = talloc_realloc(
914 msg_ctx, msg_ctx->waiters, struct tevent_req *,
915 msg_ctx->num_waiters + msg_ctx->num_new_waiters);
917 DEBUG(1, ("%s: talloc failed\n", __func__));
920 msg_ctx->waiters = tmp;
923 memcpy(&msg_ctx->waiters[msg_ctx->num_waiters], msg_ctx->new_waiters,
924 sizeof(struct tevent_req *) * msg_ctx->num_new_waiters);
926 msg_ctx->num_waiters += msg_ctx->num_new_waiters;
927 msg_ctx->num_new_waiters = 0;
933 Dispatch one messaging_rec
935 static void messaging_dispatch_rec(struct messaging_context *msg_ctx,
936 struct messaging_rec *rec)
938 struct messaging_callback *cb, *next;
942 for (cb = msg_ctx->callbacks; cb != NULL; cb = next) {
944 if (cb->msg_type != rec->msg_type) {
949 * the old style callbacks don't support fd passing
951 for (j=0; j < rec->num_fds; j++) {
952 int fd = rec->fds[j];
958 cb->fn(msg_ctx, cb->private_data, rec->msg_type,
959 rec->src, &rec->buf);
962 * we continue looking for matching messages after finding
963 * one. This matters for subsystems like the internal notify
964 * code which register more than one handler for the same
969 if (!messaging_append_new_waiters(msg_ctx)) {
970 for (j=0; j < rec->num_fds; j++) {
971 int fd = rec->fds[j];
980 while (i < msg_ctx->num_waiters) {
981 struct tevent_req *req;
982 struct messaging_filtered_read_state *state;
984 req = msg_ctx->waiters[i];
987 * This got cleaned up. In the meantime,
988 * move everything down one. We need
989 * to keep the order of waiters, as
990 * other code may depend on this.
992 if (i < msg_ctx->num_waiters - 1) {
993 memmove(&msg_ctx->waiters[i],
994 &msg_ctx->waiters[i+1],
995 sizeof(struct tevent_req *) *
996 (msg_ctx->num_waiters - i - 1));
998 msg_ctx->num_waiters -= 1;
1002 state = tevent_req_data(
1003 req, struct messaging_filtered_read_state);
1004 if (state->filter(rec, state->private_data)) {
1005 messaging_filtered_read_done(req, rec);
1008 * Only the first one gets the fd-array
1018 * If the fd-array isn't used, just close it.
1020 for (j=0; j < rec->num_fds; j++) {
1021 int fd = rec->fds[j];
1028 static int mess_parent_dgm_cleanup(void *private_data);
1029 static void mess_parent_dgm_cleanup_done(struct tevent_req *req);
1031 bool messaging_parent_dgm_cleanup_init(struct messaging_context *msg)
1033 struct tevent_req *req;
1035 req = background_job_send(
1036 msg, msg->event_ctx, msg, NULL, 0,
1037 lp_parm_int(-1, "messaging", "messaging dgm cleanup interval",
1039 mess_parent_dgm_cleanup, msg);
1043 tevent_req_set_callback(req, mess_parent_dgm_cleanup_done, msg);
1047 static int mess_parent_dgm_cleanup(void *private_data)
1051 ret = messaging_dgm_wipe();
1052 DEBUG(10, ("messaging_dgm_wipe returned %s\n",
1053 ret ? strerror(ret) : "ok"));
1054 return lp_parm_int(-1, "messaging", "messaging dgm cleanup interval",
1058 static void mess_parent_dgm_cleanup_done(struct tevent_req *req)
1060 struct messaging_context *msg = tevent_req_callback_data(
1061 req, struct messaging_context);
1064 status = background_job_recv(req);
1066 DEBUG(1, ("messaging dgm cleanup job ended with %s\n",
1067 nt_errstr(status)));
1069 req = background_job_send(
1070 msg, msg->event_ctx, msg, NULL, 0,
1071 lp_parm_int(-1, "messaging", "messaging dgm cleanup interval",
1073 mess_parent_dgm_cleanup, msg);
1075 DEBUG(1, ("background_job_send failed\n"));
1078 tevent_req_set_callback(req, mess_parent_dgm_cleanup_done, msg);
1081 int messaging_cleanup(struct messaging_context *msg_ctx, pid_t pid)
1086 ret = messaging_dgm_wipe();
1088 ret = messaging_dgm_cleanup(pid);
1094 struct tevent_context *messaging_tevent_context(
1095 struct messaging_context *msg_ctx)
1097 return msg_ctx->event_ctx;
1100 struct server_id_db *messaging_names_db(struct messaging_context *msg_ctx)
1102 return msg_ctx->names_db;