afb-systemd: Isolate systemd main entries

This change prepares the possibilty to remove the dependency
to systemd/libsystemd.

Change-Id: Ife4181d6c7195230a11a32e527b8973af6a096e1
Signed-off-by: José Bollo <jose.bollo@iot.bzh>

1 files changed, 64 insertions, 0 deletions

diff --git a/src/afb-systemd.c b/src/afb-systemd.c
new file mode 100644
index 00000000..4faa9fc7
--- /dev/null
+++ b/src/afb-systemd.c
@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 2015, 2016, 2017 "IoT.bzh"
+ * Author José Bollo <jose.bollo@iot.bzh>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define _GNU_SOURCE
+
+#include <unistd.h>
+#include <errno.h>
+
+#include <systemd/sd-event.h>
+#include <systemd/sd-bus.h>
+
+#include "afb-systemd.h"
+#include "jobs.h"
+
+static struct sd_bus *sdbusopen(struct sd_bus **p, int (*f)(struct sd_bus **))
+{
+	if (*p == NULL) {
+		int rc = f(p);
+		if (rc < 0) {
+			errno = -rc;
+			*p = NULL;
+		} else {
+			rc = sd_bus_attach_event(*p, afb_systemd_get_event_loop(), 0);
+			if (rc < 0) {
+				sd_bus_unref(*p);
+				errno = -rc;
+				*p = NULL;
+			}
+		}
+	}
+	return *p;
+}
+
+struct sd_event *afb_systemd_get_event_loop()
+{
+	return jobs_get_sd_event();
+}
+
+struct sd_bus *afb_systemd_get_user_bus()
+{
+	static struct sd_bus *result = NULL;
+	return sdbusopen((void*)&result, (void*)sd_bus_open_user);
+}
+
+struct sd_bus *afb_systemd_get_system_bus()
+{
+	static struct sd_bus *result = NULL;
+	return sdbusopen((void*)&result, (void*)sd_bus_open_system);
+}
+