1 files changed, 145 insertions, 0 deletions
diff --git a/source3/lib/messages_ctdb_ref.c b/source3/lib/messages_ctdb_ref.c
new file mode 100644
index 0000000..ed6285f
--- /dev/null
+++ b/source3/lib/messages_ctdb_ref.c
@@ -0,0 +1,145 @@
+/*
+ * Unix SMB/CIFS implementation.
+ * Samba internal messaging functions
+ * Copyright (C) 2017 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 "replace.h"
+#include <talloc.h>
+#include "messages_ctdb.h"
+#include "messages_ctdb_ref.h"
+#include "lib/util/debug.h"
+#include "lib/util/dlinklist.h"
+
+struct msg_ctdb_ref {
+	struct msg_ctdb_ref *prev, *next;
+	struct messaging_ctdb_fde *fde;
+	void (*recv_cb)(struct tevent_context *ev,
+			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 ctdb_pid = 0;
+static struct msg_ctdb_ref *refs = NULL;
+
+static int msg_ctdb_ref_destructor(struct msg_ctdb_ref *r);
+static void msg_ctdb_ref_recv(struct tevent_context *ev,
+			      const uint8_t *msg, size_t msg_len,
+			      int *fds, size_t num_fds, void *private_data);
+
+void *messaging_ctdb_ref(TALLOC_CTX *mem_ctx, struct tevent_context *ev,
+			 const char *sockname, int timeout, uint64_t unique_id,
+			 void (*recv_cb)(struct tevent_context *ev,
+					 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_ctdb_ref *result, *tmp_refs;
+
+	result = talloc(mem_ctx, struct msg_ctdb_ref);
+	if (result == NULL) {
+		*err = ENOMEM;
+		return NULL;
+	}
+	result->fde = NULL;
+
+	tmp_refs = refs;
+
+	if ((refs != NULL) && (ctdb_pid != tevent_cached_getpid())) {
+		/*
+		 * Have to reinit after fork
+		 */
+		messaging_ctdb_destroy();
+		refs = NULL;
+	}
+
+	if (refs == NULL) {
+		int ret;
+
+		ret = messaging_ctdb_init(sockname, timeout, unique_id,
+					  msg_ctdb_ref_recv, NULL);
+		DBG_DEBUG("messaging_ctdb_init returned %s\n", strerror(ret));
+		if (ret != 0) {
+			DEBUG(10, ("messaging_ctdb_init failed: %s\n",
+				   strerror(ret)));
+			TALLOC_FREE(result);
+			*err = ret;
+			return NULL;
+		}
+		ctdb_pid = tevent_cached_getpid();
+	}
+
+	result->fde = messaging_ctdb_register_tevent_context(result, ev);
+	if (result->fde == NULL) {
+		TALLOC_FREE(result);
+		*err = ENOMEM;
+		return NULL;
+	}
+
+	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_ctdb_ref_destructor);
+
+	return result;
+}
+
+static void msg_ctdb_ref_recv(struct tevent_context *ev,
+			      const uint8_t *msg, size_t msg_len,
+			      int *fds, size_t num_fds, void *private_data)
+{
+	struct msg_ctdb_ref *r, *next;
+
+	for (r = refs; r != NULL; r = next) {
+		bool active;
+
+		next = r->next;
+
+		active = messaging_ctdb_fde_active(r->fde);
+		if (!active) {
+			/*
+			 * r's tevent_context has died.
+			 */
+			continue;
+		}
+
+		r->recv_cb(ev, msg, msg_len, fds, num_fds,
+			   r->recv_cb_private_data);
+		break;
+	}
+}
+
+static int msg_ctdb_ref_destructor(struct msg_ctdb_ref *r)
+{
+	if (refs == NULL) {
+		abort();
+	}
+	DLIST_REMOVE(refs, r);
+
+	TALLOC_FREE(r->fde);
+
+	DBG_DEBUG("refs=%p\n", refs);
+
+	if (refs == NULL) {
+		messaging_ctdb_destroy();
+	}
+	return 0;
+}