events: Import event handling library from omap3-isp-live

The omap3-isp-live project [1] includes a generic event handling library
that implements a select-based loop. Instead of reinventing the wheel,
import the library and use it.

The original license hasn't been modified, and includes both GPL-2.0+
and LGPL-2.1+ code. The sole copyright owner is Laurent Pinchart.

[1] git://git.ideasonboard.org/omap3-isp-live.git

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

1 files changed, 48 insertions, 0 deletions

diff --git a/events.h b/events.h
new file mode 100644
index 0000000..b80cd75
--- /dev/null
+++ b/events.h
@@ -0,0 +1,48 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Generic Event Handling
+ *
+ * Copyright (C) 2018 Laurent Pinchart
+ *
+ * This file comes from the omap3-isp-live project
+ * (git://git.ideasonboard.org/omap3-isp-live.git)
+ *
+ * Copyright (C) 2010-2011 Ideas on board SPRL
+ *
+ * Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
+ */
+
+#ifndef __EVENTS_H__
+#define __EVENTS_H__
+
+#include <stdbool.h>
+#include <sys/select.h>
+
+#include "list.h"
+
+struct events {
+	struct list_entry events;
+	bool done;
+
+	int maxfd;
+	fd_set rfds;
+	fd_set wfds;
+	fd_set efds;
+};
+
+enum event_type {
+	EVENT_READ = 1,
+	EVENT_WRITE = 2,
+	EVENT_EXCEPTION = 4,
+};
+
+void events_watch_fd(struct events *events, int fd, enum event_type type,
+		     void(*callback)(void *), void *priv);
+void events_unwatch_fd(struct events *events, int fd);
+
+bool events_loop(struct events *events);
+void events_stop(struct events *events);
+
+void events_init(struct events *events);
+
+#endif