1 files changed, 64 insertions, 0 deletions
diff --git a/test/packetdrill/fd_state.h b/test/packetdrill/fd_state.h
new file mode 100644
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+++ b/test/packetdrill/fd_state.h
@@ -0,0 +1,64 @@
+/*
+ * Copyright 2017 Google Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+/*
+ * Author: ncardwell@google.com (Neal Cardwell)
+ *
+ * Interface for tracking file descriptors in the kernel under test.
+ */
+
+#ifndef __FD_STATE_H__
+#define __FD_STATE_H__
+
+#include "types.h"
+
+/* The types of file descriptor objects packetdrill can test. */
+enum fd_type_t {
+	FD_SOCKET = 1,
+	FD_FILE,
+	FD_PIPE,
+	FD_EPOLL,
+};
+
+struct state;
+struct fd_state;
+
+/* Global info about a particular kind of file descriptor. */
+struct fd_ops {
+	enum fd_type_t type;	/* type of this file descriptor */
+
+	/* Handler for closing fd. */
+	void (*close)(struct state *state, struct fd_state *fd);
+};
+
+/* State for a file descriptor during script execution. */
+struct fd_state {
+	struct fd_ops *ops;	/* info/ops for this type of fd */
+	int script_fd;		/* file descriptor in the script source */
+	int live_fd;		/* file descriptor in packetdrill runtime */
+	bool is_closed;		/* has app called close(2) ? */
+	struct fd_state *next;	/* next fd in linked list */
+};
+
+/* To cast any type of fd to the base classs. */
+static inline struct fd_state *to_fd(void *fd)
+{
+	return (struct fd_state *)fd;
+}
+
+#endif /* __FD_STATE_H__ */