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diff --git a/include/haproxy/sink-t.h b/include/haproxy/sink-t.h
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+/*
+ * include/haproxy/sink-t.h
+ * This file provides definitions for event sinks
+ *
+ * Copyright (C) 2000-2019 Willy Tarreau - w@1wt.eu
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation, version 2.1
+ * exclusively.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#ifndef _HAPROXY_SINK_T_H
+#define _HAPROXY_SINK_T_H
+
+#include <import/ist.h>
+#include <haproxy/api-t.h>
+#include <haproxy/log-t.h>
+
+/* A sink may be of 4 distinct types :
+ *   - file descriptor (such as stdout)
+ *   - ring buffer, readable from CLI
+ */
+enum sink_type {
+	SINK_TYPE_NEW,      // not yet initialized
+	SINK_TYPE_FD,       // events sent to a file descriptor
+	SINK_TYPE_BUFFER,   // events sent to a ring buffer
+};
+
+struct sink_forward_target {
+	struct server *srv;    // used server
+	struct appctx *appctx; // appctx of current session
+	size_t ofs;            // ring buffer reader offset
+	struct sink *sink;     // the associated sink
+	struct sink_forward_target *next;
+	__decl_thread(HA_SPINLOCK_T lock); // lock to protect current struct
+};
+
+/* describes the configuration and current state of an event sink */
+struct sink {
+	struct list sink_list;     // position in the sink list
+	char *name;                // sink name
+	char *desc;                // sink description
+	char *store;               // backing-store file when buffer
+	enum log_fmt fmt;          // format expected by the sink
+	enum sink_type type;       // type of storage
+	uint32_t maxlen;           // max message length (truncated above)
+	struct proxy* forward_px;  // internal proxy used to forward (only set when exclusive to sink)
+	struct sink_forward_target *sft; // sink forward targets
+	struct task *forward_task; // task to handle forward targets conns
+	struct sig_handler *forward_sighandler; /* signal handler */
+	struct {
+		struct ring *ring;    // used by ring buffer and STRM sender
+		unsigned int dropped; // dropped events since last one.
+		int fd;               // fd num for FD type sink
+		__decl_thread(HA_RWLOCK_T lock); // shared/excl for dropped
+	} ctx;
+};
+
+#endif /* _HAPROXY_SINK_T_H */
+
+/*
+ * Local variables:
+ *  c-indent-level: 8
+ *  c-basic-offset: 8
+ * End:
+ */