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diff --git a/src/ssl/test/async_bio.h b/src/ssl/test/async_bio.h
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+/* Copyright (c) 2014, Google Inc.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+ * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
+
+#ifndef HEADER_ASYNC_BIO
+#define HEADER_ASYNC_BIO
+
+#include <openssl/bio.h>
+
+
+// async_bio_create creates a filter BIO for testing asynchronous state
+// machines which consume a stream socket. Reads and writes will fail
+// and return EAGAIN unless explicitly allowed. Each async BIO has a
+// read quota and a write quota. Initially both are zero. As each is
+// incremented, bytes are allowed to flow through the BIO.
+BIO *async_bio_create();
+
+// async_bio_create_datagram creates a filter BIO for testing for
+// asynchronous state machines which consume datagram sockets. The read
+// and write quota count in packets rather than bytes.
+BIO *async_bio_create_datagram();
+
+// async_bio_allow_read increments |bio|'s read quota by |count|.
+void async_bio_allow_read(BIO *bio, size_t count);
+
+// async_bio_allow_write increments |bio|'s write quota by |count|.
+void async_bio_allow_write(BIO *bio, size_t count);
+
+
+#endif  // HEADER_ASYNC_BIO