| 1 | /*
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| 2 | Unix SMB/CIFS implementation.
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| 3 | Samba internal messaging functions
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| 4 | Copyright (C) 2007 by Volker Lendecke
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| 5 |
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| 6 | This program is free software; you can redistribute it and/or modify
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| 7 | it under the terms of the GNU General Public License as published by
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| 8 | the Free Software Foundation; either version 3 of the License, or
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| 9 | (at your option) any later version.
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| 10 |
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| 11 | This program is distributed in the hope that it will be useful,
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| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 14 | GNU General Public License for more details.
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| 15 |
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| 16 | You should have received a copy of the GNU General Public License
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| 17 | along with this program. If not, see <http://www.gnu.org/licenses/>.
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| 18 | */
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| 19 |
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| 20 | /**
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| 21 | @defgroup messages Internal messaging framework
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| 22 | @{
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| 23 | @file messages.c
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| 24 |
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| 25 | @brief Module for internal messaging between Samba daemons.
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| 26 |
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| 27 | The idea is that if a part of Samba wants to do communication with
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| 28 | another Samba process then it will do a message_register() of a
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| 29 | dispatch function, and use message_send_pid() to send messages to
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| 30 | that process.
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| 31 |
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| 32 | The dispatch function is given the pid of the sender, and it can
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| 33 | use that to reply by message_send_pid(). See ping_message() for a
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| 34 | simple example.
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| 35 |
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| 36 | @caution Dispatch functions must be able to cope with incoming
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| 37 | messages on an *odd* byte boundary.
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| 38 |
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| 39 | This system doesn't have any inherent size limitations but is not
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| 40 | very efficient for large messages or when messages are sent in very
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| 41 | quick succession.
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| 42 |
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| 43 | */
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| 44 |
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| 45 | #include "includes.h"
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| 46 | #include "librpc/gen_ndr/messaging.h"
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| 47 | #include "librpc/gen_ndr/ndr_messaging.h"
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| 48 |
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| 49 | static sig_atomic_t received_signal;
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| 50 |
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| 51 | static NTSTATUS messaging_tdb_send(struct messaging_context *msg_ctx,
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| 52 | struct server_id pid, int msg_type,
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| 53 | const DATA_BLOB *data,
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| 54 | struct messaging_backend *backend);
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| 55 |
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| 56 | /****************************************************************************
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| 57 | Notifications come in as signals.
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| 58 | ****************************************************************************/
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| 59 |
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| 60 | static void sig_usr1(void)
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| 61 | {
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| 62 | received_signal = 1;
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| 63 | sys_select_signal(SIGUSR1);
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| 64 | }
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| 65 |
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| 66 | static int messaging_tdb_destructor(struct messaging_backend *tdb_ctx)
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| 67 | {
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| 68 | TDB_CONTEXT *tdb = (TDB_CONTEXT *)tdb_ctx->private_data;
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| 69 | tdb_close(tdb);
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| 70 | return 0;
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| 71 | }
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| 72 |
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| 73 | /****************************************************************************
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| 74 | Initialise the messaging functions.
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