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diff --git a/fluent-bit/lib/librdkafka-2.1.0/tests/sockem.h b/fluent-bit/lib/librdkafka-2.1.0/tests/sockem.h
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+++ b/fluent-bit/lib/librdkafka-2.1.0/tests/sockem.h
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+/*
+ * sockem - socket-level network emulation
+ *
+ * Copyright (c) 2016, Magnus Edenhill, Andreas Smas
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. 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 OWNER 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 _RD_SOCKEM_H_
+#define _RD_SOCKEM_H_
+
+#include <sys/types.h>
+#include <sys/socket.h>
+
+
+typedef struct sockem_s sockem_t;
+
+
+
+/**
+ * @brief Connect to \p addr
+ *
+ * See sockem_set for the va-arg list definition.
+ *
+ * @returns a sockem handle on success or NULL on failure.
+ */
+sockem_t *
+sockem_connect(int sockfd, const struct sockaddr *addr, socklen_t addrlen, ...);
+
+/**
+ * @brief Close the connection and destroy the sockem.
+ */
+void sockem_close(sockem_t *skm);
+
+
+
+/**
+ * @brief Set sockem parameters by `char *key, int val` tuples.
+ *
+ * Keys:
+ *   rx.thruput
+ *   tx.thruput
+ *   delay
+ *   jitter
+ *   rx.bufsz
+ *   true (dummy, ignored)
+ *
+ * The key may also be a CSV-list of "key=val,key2=val2" pairs in which case
+ * val must be 0 and the sentinel NULL.
+ *
+ * The va-arg list must be terminated with a NULL sentinel
+ *
+ * @returns 0 on success or -1 if a key was unknown.
+ */
+int sockem_set(sockem_t *skm, ...);
+
+
+
+/**
+ * @brief Find sockem by (application) socket.
+ * @remark Application is responsible for locking.
+ */
+sockem_t *sockem_find(int sockfd);
+
+#endif /* _RD_SOCKEM_H_ */