--- /dev/null
+/*
+ * Copyright (C) 2013 David Goulet <dgoulet@efficios.com>
+ * Copyright (C) 2016 Jérémie Galarneau <jeremie.galarneau@efficios.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0-only
+ *
+ */
+
+#ifndef AGENT_COMM
+#define AGENT_COMM
+
+#include <stdint.h>
+
+#include <common/macros.hpp>
+#include <lttng/lttng.h>
+
+/*
+ * Command value passed in the header.
+ */
+enum lttcomm_agent_command {
+ AGENT_CMD_LIST = 1,
+ AGENT_CMD_ENABLE = 2,
+ AGENT_CMD_DISABLE = 3,
+ AGENT_CMD_REG_DONE = 4, /* End registration process. */
+ AGENT_CMD_APP_CTX_ENABLE = 5,
+ AGENT_CMD_APP_CTX_DISABLE = 6,
+};
+
+/*
+ * Return codes from the agent.
+ */
+enum lttcomm_agent_ret_code {
+ /* Success, assumed to be the first entry */
+ AGENT_RET_CODE_SUCCESS = 1,
+ /* Invalid command */
+ AGENT_RET_CODE_INVALID = 2,
+ /* Unknown logger name */
+ AGENT_RET_CODE_UNKNOWN_NAME = 3,
+ AGENT_RET_CODE_NR,
+};
+
+/*
+ * Agent application communication header.
+ */
+struct lttcomm_agent_hdr {
+ uint64_t data_size; /* data size following this header */
+ uint32_t cmd; /* Enum of agent command. */
+ uint32_t cmd_version; /* command version */
+} LTTNG_PACKED;
+
+/*
+ * Enable event command payload. Will be immediately followed by the
+ * variable-length string representing the filter expression.
+ */
+struct lttcomm_agent_enable_event {
+ uint32_t loglevel_value;
+ uint32_t loglevel_type;
+ char name[LTTNG_SYMBOL_NAME_LEN];
+ uint32_t filter_expression_length;
+} LTTNG_PACKED;
+
+/*
+ * Disable event command payload.
+ */
+struct lttcomm_agent_disable_event {
+ char name[LTTNG_SYMBOL_NAME_LEN];
+} LTTNG_PACKED;
+
+/*
+ * Generic reply coming from the agent.
+ */
+struct lttcomm_agent_generic_reply {
+ uint32_t ret_code;
+} LTTNG_PACKED;
+
+/*
+ * List command reply header.
+ */
+struct lttcomm_agent_list_reply_hdr {
+ uint32_t ret_code;
+ uint32_t data_size;
+} LTTNG_PACKED;
+
+/*
+ * List command reply payload coming from the agent.
+ */
+struct lttcomm_agent_list_reply {
+ uint32_t nb_event;
+ /* List of event name each of them ending by a NULL byte. */
+ char payload[];
+} LTTNG_PACKED;
+
+#endif /* AGENT_COMM */