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);
383 struct server_id_buf tmp;
384 DBG_DEBUG("my id: %s\n", server_id_str_buf(ctx->id, &tmp));
390 struct server_id messaging_server_id(const struct messaging_context *msg_ctx)
396 * re-init after a fork
398 NTSTATUS messaging_reinit(struct messaging_context *msg_ctx)
403 TALLOC_FREE(msg_ctx->msg_dgm_ref);
405 msg_ctx->id = (struct server_id) {
406 .pid = getpid(), .vnn = msg_ctx->id.vnn
409 lck_path = lock_path("msg.lock");
410 if (lck_path == NULL) {
411 return NT_STATUS_NO_MEMORY;
414 msg_ctx->msg_dgm_ref = messaging_dgm_ref(
415 msg_ctx, msg_ctx->event_ctx, &msg_ctx->id.unique_id,
416 private_path("msg.sock"), lck_path,
417 messaging_recv_cb, msg_ctx, &ret);
419 if (msg_ctx->msg_dgm_ref == NULL) {
420 DEBUG(2, ("messaging_dgm_ref failed: %s\n", strerror(ret)));
421 return map_nt_error_from_unix(ret);
424 if (lp_clustering()) {
425 ret = messaging_ctdbd_reinit(msg_ctx, msg_ctx,
429 DEBUG(1, ("messaging_ctdbd_init failed: %s\n",
431 return map_nt_error_from_unix(ret);
435 server_id_db_reinit(msg_ctx->names_db, msg_ctx->id);
442 * Register a dispatch function for a particular message type. Allow multiple
445 NTSTATUS messaging_register(struct messaging_context *msg_ctx,
448 void (*fn)(struct messaging_context *msg,
451 struct server_id server_id,
454 struct messaging_callback *cb;
456 DEBUG(5, ("Registering messaging pointer for type %u - "
458 (unsigned)msg_type, private_data));
461 * Only one callback per type
464 for (cb = msg_ctx->callbacks; cb != NULL; cb = cb->next) {
465 /* we allow a second registration of the same message
466 type if it has a different private pointer. This is
467 needed in, for example, the internal notify code,
468 which creates a new notify context for each tree
469 connect, and expects to receive messages to each of
471 if (cb->msg_type == msg_type && private_data == cb->private_data) {
472 DEBUG(5,("Overriding messaging pointer for type %u - private_data=%p\n",
473 (unsigned)msg_type, private_data));
475 cb->private_data = private_data;
480 if (!(cb = talloc(msg_ctx, struct messaging_callback))) {
481 return NT_STATUS_NO_MEMORY;
484 cb->msg_type = msg_type;
486 cb->private_data = private_data;
488 DLIST_ADD(msg_ctx->callbacks, cb);
493 De-register the function for a particular message type.
495 void messaging_deregister(struct messaging_context *ctx, uint32_t msg_type,
498 struct messaging_callback *cb, *next;
500 for (cb = ctx->callbacks; cb; cb = next) {
502 if ((cb->msg_type == msg_type)
503 && (cb->private_data == private_data)) {
504 DEBUG(5,("Deregistering messaging pointer for type %u - private_data=%p\n",
505 (unsigned)msg_type, private_data));
506 DLIST_REMOVE(ctx->callbacks, cb);
513 Send a message to a particular server
515 NTSTATUS messaging_send(struct messaging_context *msg_ctx,
516 struct server_id server, uint32_t msg_type,
517 const DATA_BLOB *data)
521 iov.iov_base = data->data;
522 iov.iov_len = data->length;
524 return messaging_send_iov(msg_ctx, server, msg_type, &iov, 1, NULL, 0);
527 NTSTATUS messaging_send_buf(struct messaging_context *msg_ctx,
528 struct server_id server, uint32_t msg_type,
529 const uint8_t *buf, size_t len)
531 DATA_BLOB blob = data_blob_const(buf, len);
532 return messaging_send(msg_ctx, server, msg_type, &blob);
535 int messaging_send_iov_from(struct messaging_context *msg_ctx,
536 struct server_id src, struct server_id dst,
538 const struct iovec *iov, int iovlen,
539 const int *fds, size_t num_fds)
542 uint8_t hdr[MESSAGE_HDR_LENGTH];
543 struct iovec iov2[iovlen+1];
545 if (server_id_is_disconnected(&dst)) {
549 if (num_fds > INT8_MAX) {
553 if (dst.vnn != msg_ctx->id.vnn) {
558 ret = msg_ctx->remote->send_fn(src, dst,
559 msg_type, iov, iovlen,
565 message_hdr_put(hdr, msg_type, src, dst);
566 iov2[0] = (struct iovec){ .iov_base = hdr, .iov_len = sizeof(hdr) };
567 memcpy(&iov2[1], iov, iovlen * sizeof(*iov));
570 ret = messaging_dgm_send(dst.pid, iov2, iovlen+1, fds, num_fds);
576 NTSTATUS messaging_send_iov(struct messaging_context *msg_ctx,
577 struct server_id dst, uint32_t msg_type,
578 const struct iovec *iov, int iovlen,
579 const int *fds, size_t num_fds)
583 ret = messaging_send_iov_from(msg_ctx, msg_ctx->id, dst, msg_type,
584 iov, iovlen, fds, num_fds);
586 return map_nt_error_from_unix(ret);
591 static struct messaging_rec *messaging_rec_dup(TALLOC_CTX *mem_ctx,
592 struct messaging_rec *rec)
594 struct messaging_rec *result;
595 size_t fds_size = sizeof(int64_t) * rec->num_fds;
597 result = talloc_pooled_object(mem_ctx, struct messaging_rec, 2,
598 rec->buf.length + fds_size);
599 if (result == NULL) {
604 /* Doesn't fail, see talloc_pooled_object */
606 result->buf.data = talloc_memdup(result, rec->buf.data,
610 if (result->num_fds > 0) {
611 result->fds = talloc_memdup(result, rec->fds, fds_size);
617 struct messaging_filtered_read_state {
618 struct tevent_context *ev;
619 struct messaging_context *msg_ctx;
622 bool (*filter)(struct messaging_rec *rec, void *private_data);
625 struct messaging_rec *rec;
628 static void messaging_filtered_read_cleanup(struct tevent_req *req,
629 enum tevent_req_state req_state);
631 struct tevent_req *messaging_filtered_read_send(
632 TALLOC_CTX *mem_ctx, struct tevent_context *ev,
633 struct messaging_context *msg_ctx,
634 bool (*filter)(struct messaging_rec *rec, void *private_data),
637 struct tevent_req *req;
638 struct messaging_filtered_read_state *state;
639 size_t new_waiters_len;
641 req = tevent_req_create(mem_ctx, &state,
642 struct messaging_filtered_read_state);
647 state->msg_ctx = msg_ctx;
648 state->filter = filter;
649 state->private_data = private_data;
652 * We have to defer the callback here, as we might be called from
653 * within a different tevent_context than state->ev
655 tevent_req_defer_callback(req, state->ev);
657 state->tevent_handle = messaging_dgm_register_tevent_context(
659 if (tevent_req_nomem(state->tevent_handle, req)) {
660 return tevent_req_post(req, ev);
664 * We add ourselves to the "new_waiters" array, not the "waiters"
665 * array. If we are called from within messaging_read_done,
666 * messaging_dispatch_rec will be in an active for-loop on
667 * "waiters". We must be careful not to mess with this array, because
668 * it could mean that a single event is being delivered twice.
671 new_waiters_len = talloc_array_length(msg_ctx->new_waiters);
673 if (new_waiters_len == msg_ctx->num_new_waiters) {
674 struct tevent_req **tmp;
676 tmp = talloc_realloc(msg_ctx, msg_ctx->new_waiters,
677 struct tevent_req *, new_waiters_len+1);
678 if (tevent_req_nomem(tmp, req)) {
679 return tevent_req_post(req, ev);
681 msg_ctx->new_waiters = tmp;
684 msg_ctx->new_waiters[msg_ctx->num_new_waiters] = req;
685 msg_ctx->num_new_waiters += 1;
686 tevent_req_set_cleanup_fn(req, messaging_filtered_read_cleanup);
691 static void messaging_filtered_read_cleanup(struct tevent_req *req,
692 enum tevent_req_state req_state)
694 struct messaging_filtered_read_state *state = tevent_req_data(
695 req, struct messaging_filtered_read_state);
696 struct messaging_context *msg_ctx = state->msg_ctx;
699 tevent_req_set_cleanup_fn(req, NULL);
701 TALLOC_FREE(state->tevent_handle);
704 * Just set the [new_]waiters entry to NULL, be careful not to mess
705 * with the other "waiters" array contents. We are often called from
706 * within "messaging_dispatch_rec", which loops over
707 * "waiters". Messing with the "waiters" array will mess up that
711 for (i=0; i<msg_ctx->num_waiters; i++) {
712 if (msg_ctx->waiters[i] == req) {
713 msg_ctx->waiters[i] = NULL;
718 for (i=0; i<msg_ctx->num_new_waiters; i++) {
719 if (msg_ctx->new_waiters[i] == req) {
720 msg_ctx->new_waiters[i] = NULL;
726 static void messaging_filtered_read_done(struct tevent_req *req,
727 struct messaging_rec *rec)
729 struct messaging_filtered_read_state *state = tevent_req_data(
730 req, struct messaging_filtered_read_state);
732 state->rec = messaging_rec_dup(state, rec);
733 if (tevent_req_nomem(state->rec, req)) {
736 tevent_req_done(req);
739 int messaging_filtered_read_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
740 struct messaging_rec **presult)
742 struct messaging_filtered_read_state *state = tevent_req_data(
743 req, struct messaging_filtered_read_state);
746 if (tevent_req_is_unix_error(req, &err)) {
747 tevent_req_received(req);
750 *presult = talloc_move(mem_ctx, &state->rec);
754 struct messaging_read_state {
756 struct messaging_rec *rec;
759 static bool messaging_read_filter(struct messaging_rec *rec,
761 static void messaging_read_done(struct tevent_req *subreq);
763 struct tevent_req *messaging_read_send(TALLOC_CTX *mem_ctx,
764 struct tevent_context *ev,
765 struct messaging_context *msg,
768 struct tevent_req *req, *subreq;
769 struct messaging_read_state *state;
771 req = tevent_req_create(mem_ctx, &state,
772 struct messaging_read_state);
776 state->msg_type = msg_type;
778 subreq = messaging_filtered_read_send(state, ev, msg,
779 messaging_read_filter, state);
780 if (tevent_req_nomem(subreq, req)) {
781 return tevent_req_post(req, ev);
783 tevent_req_set_callback(subreq, messaging_read_done, req);
787 static bool messaging_read_filter(struct messaging_rec *rec,
790 struct messaging_read_state *state = talloc_get_type_abort(
791 private_data, struct messaging_read_state);
793 if (rec->num_fds != 0) {
797 return rec->msg_type == state->msg_type;
800 static void messaging_read_done(struct tevent_req *subreq)
802 struct tevent_req *req = tevent_req_callback_data(
803 subreq, struct tevent_req);
804 struct messaging_read_state *state = tevent_req_data(
805 req, struct messaging_read_state);
808 ret = messaging_filtered_read_recv(subreq, state, &state->rec);
810 if (tevent_req_error(req, ret)) {
813 tevent_req_done(req);
816 int messaging_read_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
817 struct messaging_rec **presult)
819 struct messaging_read_state *state = tevent_req_data(
820 req, struct messaging_read_state);
823 if (tevent_req_is_unix_error(req, &err)) {
826 if (presult != NULL) {
827 *presult = talloc_move(mem_ctx, &state->rec);
832 struct messaging_handler_state {
833 struct tevent_context *ev;
834 struct messaging_context *msg_ctx;
836 bool (*handler)(struct messaging_context *msg_ctx,
837 struct messaging_rec **rec, void *private_data);
841 static void messaging_handler_got_msg(struct tevent_req *subreq);
843 struct tevent_req *messaging_handler_send(
844 TALLOC_CTX *mem_ctx, struct tevent_context *ev,
845 struct messaging_context *msg_ctx, uint32_t msg_type,
846 bool (*handler)(struct messaging_context *msg_ctx,
847 struct messaging_rec **rec, void *private_data),
850 struct tevent_req *req, *subreq;
851 struct messaging_handler_state *state;
853 req = tevent_req_create(mem_ctx, &state,
854 struct messaging_handler_state);
859 state->msg_ctx = msg_ctx;
860 state->msg_type = msg_type;
861 state->handler = handler;
862 state->private_data = private_data;
864 subreq = messaging_read_send(state, state->ev, state->msg_ctx,
866 if (tevent_req_nomem(subreq, req)) {
867 return tevent_req_post(req, ev);
869 tevent_req_set_callback(subreq, messaging_handler_got_msg, req);
873 static void messaging_handler_got_msg(struct tevent_req *subreq)
875 struct tevent_req *req = tevent_req_callback_data(
876 subreq, struct tevent_req);
877 struct messaging_handler_state *state = tevent_req_data(
878 req, struct messaging_handler_state);
879 struct messaging_rec *rec;
883 ret = messaging_read_recv(subreq, state, &rec);
885 if (tevent_req_error(req, ret)) {
889 subreq = messaging_read_send(state, state->ev, state->msg_ctx,
891 if (tevent_req_nomem(subreq, req)) {
894 tevent_req_set_callback(subreq, messaging_handler_got_msg, req);
896 ok = state->handler(state->msg_ctx, &rec, state->private_data);
905 tevent_req_done(req);
908 int messaging_handler_recv(struct tevent_req *req)
910 return tevent_req_simple_recv_unix(req);
913 static bool messaging_append_new_waiters(struct messaging_context *msg_ctx)
915 if (msg_ctx->num_new_waiters == 0) {
919 if (talloc_array_length(msg_ctx->waiters) <
920 (msg_ctx->num_waiters + msg_ctx->num_new_waiters)) {
921 struct tevent_req **tmp;
922 tmp = talloc_realloc(
923 msg_ctx, msg_ctx->waiters, struct tevent_req *,
924 msg_ctx->num_waiters + msg_ctx->num_new_waiters);
926 DEBUG(1, ("%s: talloc failed\n", __func__));
929 msg_ctx->waiters = tmp;
932 memcpy(&msg_ctx->waiters[msg_ctx->num_waiters], msg_ctx->new_waiters,
933 sizeof(struct tevent_req *) * msg_ctx->num_new_waiters);
935 msg_ctx->num_waiters += msg_ctx->num_new_waiters;
936 msg_ctx->num_new_waiters = 0;
942 Dispatch one messaging_rec
944 static void messaging_dispatch_rec(struct messaging_context *msg_ctx,
945 struct messaging_rec *rec)
947 struct messaging_callback *cb, *next;
951 for (cb = msg_ctx->callbacks; cb != NULL; cb = next) {
953 if (cb->msg_type != rec->msg_type) {
958 * the old style callbacks don't support fd passing
960 for (j=0; j < rec->num_fds; j++) {
961 int fd = rec->fds[j];
967 cb->fn(msg_ctx, cb->private_data, rec->msg_type,
968 rec->src, &rec->buf);
971 * we continue looking for matching messages after finding
972 * one. This matters for subsystems like the internal notify
973 * code which register more than one handler for the same
978 if (!messaging_append_new_waiters(msg_ctx)) {
979 for (j=0; j < rec->num_fds; j++) {
980 int fd = rec->fds[j];
989 while (i < msg_ctx->num_waiters) {
990 struct tevent_req *req;
991 struct messaging_filtered_read_state *state;
993 req = msg_ctx->waiters[i];
996 * This got cleaned up. In the meantime,
997 * move everything down one. We need
998 * to keep the order of waiters, as
999 * other code may depend on this.
1001 if (i < msg_ctx->num_waiters - 1) {
1002 memmove(&msg_ctx->waiters[i],
1003 &msg_ctx->waiters[i+1],
1004 sizeof(struct tevent_req *) *
1005 (msg_ctx->num_waiters - i - 1));
1007 msg_ctx->num_waiters -= 1;
1011 state = tevent_req_data(
1012 req, struct messaging_filtered_read_state);
1013 if (state->filter(rec, state->private_data)) {
1014 messaging_filtered_read_done(req, rec);
1017 * Only the first one gets the fd-array
1027 * If the fd-array isn't used, just close it.
1029 for (j=0; j < rec->num_fds; j++) {
1030 int fd = rec->fds[j];
1037 static int mess_parent_dgm_cleanup(void *private_data);
1038 static void mess_parent_dgm_cleanup_done(struct tevent_req *req);
1040 bool messaging_parent_dgm_cleanup_init(struct messaging_context *msg)
1042 struct tevent_req *req;
1044 req = background_job_send(
1045 msg, msg->event_ctx, msg, NULL, 0,
1046 lp_parm_int(-1, "messaging", "messaging dgm cleanup interval",
1048 mess_parent_dgm_cleanup, msg);
1052 tevent_req_set_callback(req, mess_parent_dgm_cleanup_done, msg);
1056 static int mess_parent_dgm_cleanup(void *private_data)
1060 ret = messaging_dgm_wipe();
1061 DEBUG(10, ("messaging_dgm_wipe returned %s\n",
1062 ret ? strerror(ret) : "ok"));
1063 return lp_parm_int(-1, "messaging", "messaging dgm cleanup interval",
1067 static void mess_parent_dgm_cleanup_done(struct tevent_req *req)
1069 struct messaging_context *msg = tevent_req_callback_data(
1070 req, struct messaging_context);
1073 status = background_job_recv(req);
1075 DEBUG(1, ("messaging dgm cleanup job ended with %s\n",
1076 nt_errstr(status)));
1078 req = background_job_send(
1079 msg, msg->event_ctx, msg, NULL, 0,
1080 lp_parm_int(-1, "messaging", "messaging dgm cleanup interval",
1082 mess_parent_dgm_cleanup, msg);
1084 DEBUG(1, ("background_job_send failed\n"));
1087 tevent_req_set_callback(req, mess_parent_dgm_cleanup_done, msg);
1090 int messaging_cleanup(struct messaging_context *msg_ctx, pid_t pid)
1095 ret = messaging_dgm_wipe();
1097 ret = messaging_dgm_cleanup(pid);
1103 struct tevent_context *messaging_tevent_context(
1104 struct messaging_context *msg_ctx)
1106 return msg_ctx->event_ctx;
1109 struct server_id_db *messaging_names_db(struct messaging_context *msg_ctx)
1111 return msg_ctx->names_db;