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diff --git a/source/app/ReturnCodes.h b/source/app/ReturnCodes.h
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+//
+// ReturnCodes.h - MrsWatson
+// Created by Nik Reiman on 10 May 13.
+// Copyright (c) 2013 Teragon Audio. All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//
+// * Redistributions of source code must retain the above copyright notice,
+//   this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above copyright notice,
+//   this list of conditions and the following disclaimer in the documentation
+//   and/or other materials provided with the distribution.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+// POSSIBILITY OF SUCH DAMAGE.
+//
+
+#ifndef MrsWatson_ReturnCodes_h
+#define MrsWatson_ReturnCodes_h
+
+// Exit result codes
+typedef enum {
+    RETURN_CODE_SUCCESS,
+    RETURN_CODE_NOT_RUN,
+    RETURN_CODE_INVALID_ARGUMENT,
+    RETURN_CODE_MISSING_REQUIRED_OPTION,
+    RETURN_CODE_IO_ERROR,
+    RETURN_CODE_PLUGIN_ERROR,
+    RETURN_CODE_INVALID_PLUGIN_CHAIN,
+    RETURN_CODE_UNSUPPORTED_FEATURE,
+    RETURN_CODE_INTERNAL_ERROR,
+    // This return code should always be last in this enum list. It is not
+    // actually used, but instead we add the signal number to it and exit with
+    // that code instead.
+    RETURN_CODE_SIGNAL,
+
+    // Failure codes when forking processes (at present only used by test suite)
+    RETURN_CODE_FORK_FAILED = -1,
+    RETURN_CODE_SHELL_FAILED = 127,
+    RETURN_CODE_LAUNCH_FAILED_OTHER = 255,
+
+    NUM_RETURN_CODES
+} ReturnCodes;
+
+#endif