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@@ -24,6 +24,8 @@ int relay_send_command_from_edge_(streamid_t stream_id, circuit_t *circ,
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uint8_t relay_command, const char *payload,
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size_t payload_len, crypt_path_t *cpath_layer,
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const char *filename, int lineno);
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+/* Indicates to relay_send_command_from_edge() that it is a control cell. */
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+#define CONTROL_CELL_ID 0
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#define relay_send_command_from_edge(stream_id, circ, relay_command, payload, \
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payload_len, cpath_layer) \
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relay_send_command_from_edge_((stream_id), (circ), (relay_command), \
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