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

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

src/iwatch.c

@@ -0,0 +1,118 @@
+#include <errno.h>
+
+#include "finit.h"
+#include "iwatch.h"
+#include "log.h"
+
+
+int iwatch_init(struct iwatch *iw)
+{
+	if (!iw) {
+		errno = EINVAL;
+		return -1;
+	}
+
+	TAILQ_INIT(&iw->iwp_list);
+
+	iw->fd = inotify_init1(IN_NONBLOCK | IN_CLOEXEC);
+	if (iw->fd < 0) {
+		_pe("inotify_init()");
+		return -1;
+	}
+
+	return iw->fd;
+}
+
+void iwatch_exit(struct iwatch *iw)
+{
+	struct iwatch_path *iwp, *tmp;
+
+	TAILQ_FOREACH_SAFE(iwp, &iw->iwp_list, link, tmp) {
+		TAILQ_REMOVE(&iw->iwp_list, iwp, link);
+		inotify_rm_watch(iw->fd, iwp->wd);
+		free(iwp->path);
+		free(iwp);
+	}
+
+	close(iw->fd);
+}
+
+int iwatch_add(struct iwatch *iw, char *file, uint32_t mask)
+{
+	struct iwatch_path *iwp;
+	char *path;
+	int wd;
+
+	_d("Adding new watcher for path %s", file);
+
+	path = strdup(file);
+	if (!path) {
+		_pe("Out of memory");
+		return -1;
+	}
+
+	wd = inotify_add_watch(iw->fd, path, IWATCH_MASK | mask);
+	if (wd < 0) {
+		_pe("inotify_add_watch(%s)", path);
+		free(path);
+		return -1;
+	}
+
+	iwp = malloc(sizeof(struct iwatch_path));
+	if (!iwp) {
+		_pe("Failed allocating new `struct iwatch_path`");
+		inotify_rm_watch(iw->fd, wd);
+		free(path);
+		return -1;
+	}
+
+	iwp->path = path;
+	iwp->wd = wd;
+	TAILQ_INSERT_HEAD(&iw->iwp_list, iwp, link);
+
+	return 0;
+}
+
+int iwatch_del(struct iwatch *iw, struct iwatch_path *iwp)
+{
+	_d("Removing watcher for removed path %s", iwp->path);
+
+	TAILQ_REMOVE(&iw->iwp_list, iwp, link);
+	inotify_rm_watch(iw->fd, iwp->wd);
+	free(iwp->path);
+	free(iwp);
+
+	return 0;
+}
+
+struct iwatch_path *iwatch_find_by_wd(struct iwatch *iw, int wd)
+{
+	struct iwatch_path *iwp;
+
+	TAILQ_FOREACH(iwp, &iw->iwp_list, link) {
+		if (iwp->wd == wd)
+			return iwp;
+	}
+
+	return NULL;
+}
+
+struct iwatch_path *iwatch_find_by_path(struct iwatch *iw, const char *path)
+{
+	struct iwatch_path *iwp;
+
+	TAILQ_FOREACH(iwp, &iw->iwp_list, link) {
+		if (!strcmp(iwp->path, path))
+			return iwp;
+	}
+
+	return NULL;
+}
+
+/**
+ * Local Variables:
+ *  indent-tabs-mode: t
+ *  c-file-style: "linux"
+ * End:
+ */
+