fdev: Introduce fdev for file event handling

[src/app-framework-binder.git] / src / fdev-systemd.c

diff --git a/src/fdev-systemd.c b/src/fdev-systemd.c
new file mode 100644 (file)
index 0000000..0f4a03c
--- /dev/null
+++ b/src/fdev-systemd.c
@@ -0,0 +1,79 @@
+/*
+ * Copyright (C) 2018 "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.
+ */
+
+#include <errno.h>
+
+#include <systemd/sd-event.h>
+
+#define FDEV_PROVIDER
+#include "fdev.h"
+#include "fdev-systemd.h"
+
+static int handler(sd_event_source *s, int fd, uint32_t revents, void *userdata)
+{
+       struct fdev *fdev = userdata;
+       fdev_dispatch(fdev, revents);
+       return 0;
+}
+
+static void unref(void *closure)
+{
+       sd_event_source *source = closure;
+       sd_event_source_unref(source);
+}
+
+static void disable(void *closure, const struct fdev *fdev)
+{
+       sd_event_source *source = closure;
+       sd_event_source_set_enabled(source, SD_EVENT_OFF);
+}
+
+static void enable(void *closure, const struct fdev *fdev)
+{
+       sd_event_source *source = closure;
+       sd_event_source_set_io_events(source, fdev_events(fdev));
+       sd_event_source_set_enabled(source, SD_EVENT_ON);
+}
+
+static struct fdev_itf itf =
+{
+       .unref = unref,
+       .disable = disable,
+       .enable = enable
+};
+
+struct fdev *fdev_systemd_create(struct sd_event *eloop, int fd)
+{
+       int rc;
+       sd_event_source *source;
+       struct fdev *fdev;
+
+       fdev = fdev_create(fd);
+       if (fdev) {
+               rc = sd_event_add_io(eloop, &source, fd, 0, handler, fdev);
+               if (rc < 0) {
+                       fdev_unref(fdev);
+                       fdev = 0;
+                       errno = -rc;
+               } else {
+                       sd_event_source_set_enabled(source, SD_EVENT_OFF);
+                       fdev_set_itf(fdev, &itf, source);
+               }
+       }
+       return fdev;
+}
+