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/*
* Unix SMB/CIFS implementation.
* Samba internal messaging functions
* Copyright (C) 2014 by Volker Lendecke
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <talloc.h>
#include "replace.h"
#include "messages_dgm.h"
#include "messages_dgm_ref.h"
#include "lib/util/debug.h"
#include "lib/util/dlinklist.h"
struct msg_dgm_ref {
struct msg_dgm_ref *prev, *next;
void (*recv_cb)(const uint8_t *msg, size_t msg_len,
int *fds, size_t num_fds, void *private_data);
void *recv_cb_private_data;
};
static pid_t dgm_pid = 0;
static struct msg_dgm_ref *refs = NULL;
static int msg_dgm_ref_destructor(struct msg_dgm_ref *r);
static void msg_dgm_ref_recv(const uint8_t *msg, size_t msg_len,
int *fds, size_t num_fds, void *private_data);
void *messaging_dgm_ref(TALLOC_CTX *mem_ctx, struct tevent_context *ev,
uint64_t unique,
const char *socket_dir,
const char *lockfile_dir,
void (*recv_cb)(const uint8_t *msg, size_t msg_len,
int *fds, size_t num_fds,
void *private_data),
void *recv_cb_private_data,
int *err)
{
struct msg_dgm_ref *result, *tmp_refs;
result = talloc(mem_ctx, struct msg_dgm_ref);
if (result == NULL) {
*err = ENOMEM;
return NULL;
}
tmp_refs = refs;
if ((refs != NULL) && (dgm_pid != getpid())) {
/*
* Have to reinit after fork
*/
messaging_dgm_destroy();
refs = NULL;
}
if (refs == NULL) {
int ret;
ret = messaging_dgm_init(ev, unique, socket_dir, lockfile_dir,
msg_dgm_ref_recv, NULL);
if (ret != 0) {
DEBUG(10, ("messaging_dgm_init failed: %s\n",
strerror(ret)));
TALLOC_FREE(result);
*err = ret;
return NULL;
}
dgm_pid = getpid();
}
refs = tmp_refs;
result->recv_cb = recv_cb;
result->recv_cb_private_data = recv_cb_private_data;
DLIST_ADD(refs, result);
talloc_set_destructor(result, msg_dgm_ref_destructor);
return result;
}
static void msg_dgm_ref_recv(const uint8_t *msg, size_t msg_len,
int *fds, size_t num_fds, void *private_data)
{
struct msg_dgm_ref *r, *next;
/*
* We have to broadcast incoming messages to all refs. The first ref
* that grabs the fd's will get them.
*/
for (r = refs; r != NULL; r = next) {
next = r->next;
r->recv_cb(msg, msg_len, fds, num_fds,
r->recv_cb_private_data);
}
}
static int msg_dgm_ref_destructor(struct msg_dgm_ref *r)
{
if (refs == NULL) {
abort();
}
DLIST_REMOVE(refs, r);
if (refs == NULL) {
messaging_dgm_destroy();
}
return 0;
}
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