plugins: refactor, break out inotify watcher to src/iwatch.[ch]

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

src/iwatch.h

@@ -0,0 +1,64 @@
+/* inotify watcher for files or directories
+ *
+ * Copyright (c) 2015-2016  Tobias Waldekranz <tobias@waldekranz.com>
+ * Copyright (c) 2016-2021  Joachim Wiberg <troglobit@gmail.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef FINIT_IWATCH_H_
+#define FINIT_IWATCH_H_
+
+#include <stdint.h>
+#include <lite/queue.h>
+#include <sys/inotify.h>
+
+
+/* Monitors changes to both directories and files by default */
+#define IWATCH_MASK (IN_CREATE | IN_DELETE | IN_MODIFY | IN_ATTRIB | IN_MOVE)
+
+struct iwatch_path {
+	TAILQ_ENTRY(iwatch_path) link;
+	char *path;
+	int wd;
+};
+
+struct iwatch {
+	int fd;
+	TAILQ_HEAD(, iwatch_path) iwp_list;
+};
+
+
+int  iwatch_init (struct iwatch *iw);
+void iwatch_exit (struct iwatch *iw);
+
+int  iwatch_add  (struct iwatch *iw, char *file, uint32_t mask);
+int  iwatch_del  (struct iwatch *iw, struct iwatch_path *iwp);
+
+struct iwatch_path *iwatch_find_by_wd   (struct iwatch *iw, int wd);
+struct iwatch_path *iwatch_find_by_path (struct iwatch *iw, const char *path);
+
+#endif /* FINIT_IWATCH_H_ */
+
+/**
+ * Local Variables:
+ *  indent-tabs-mode: t
+ *  c-file-style: "linux"
+ * End:
+ */