1 files changed, 104 insertions, 0 deletions
diff --git a/source3/lib/server_id_watch.c b/source3/lib/server_id_watch.c
new file mode 100644
index 0000000..f0189e0
--- /dev/null
+++ b/source3/lib/server_id_watch.c
@@ -0,0 +1,104 @@
+/*
+ * Unix SMB/CIFS implementation.
+ * Wait for process death
+ * Copyright (C) Volker Lendecke 2016
+ *
+ * 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 <tevent.h>
+#include <talloc.h>
+#include "serverid.h"
+#include "server_id_watch.h"
+#include "lib/util/tevent_unix.h"
+
+struct server_id_watch_state {
+	struct tevent_context *ev;
+	struct server_id pid;
+};
+
+static void server_id_watch_waited(struct tevent_req *subreq);
+
+struct tevent_req *server_id_watch_send(TALLOC_CTX *mem_ctx,
+					struct tevent_context *ev,
+					struct server_id pid)
+{
+	struct tevent_req *req, *subreq;
+	struct server_id_watch_state *state;
+
+	req = tevent_req_create(mem_ctx, &state, struct server_id_watch_state);
+	if (req == NULL) {
+		return NULL;
+	}
+	state->ev = ev;
+	state->pid = pid;
+
+	if (!serverid_exists(&state->pid)) {
+		tevent_req_done(req);
+		return tevent_req_post(req, ev);
+	}
+
+	subreq = tevent_wakeup_send(
+		state, ev, tevent_timeval_current_ofs(0, 500000));
+	if (tevent_req_nomem(subreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+	tevent_req_set_callback(subreq, server_id_watch_waited, req);
+
+	return req;
+}
+
+static void server_id_watch_waited(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct server_id_watch_state *state = tevent_req_data(
+		req, struct server_id_watch_state);
+	bool ok;
+
+	ok = tevent_wakeup_recv(subreq);
+	TALLOC_FREE(subreq);
+	if (!ok) {
+		tevent_req_oom(req);
+		return;
+	}
+
+	if (!serverid_exists(&state->pid)) {
+		tevent_req_done(req);
+		return;
+	}
+
+	subreq = tevent_wakeup_send(
+		state, state->ev, tevent_timeval_current_ofs(0, 500000));
+	if (tevent_req_nomem(subreq, req)) {
+		return;
+	}
+	tevent_req_set_callback(subreq, server_id_watch_waited, req);
+}
+
+int server_id_watch_recv(struct tevent_req *req, struct server_id *pid)
+{
+	struct server_id_watch_state *state = tevent_req_data(
+		req, struct server_id_watch_state);
+	int err;
+
+	if (tevent_req_is_unix_error(req, &err)) {
+		return err;
+	}
+	if (pid) {
+		*pid = state->pid;
+	}
+	return 0;
+}