Fix: lttng: enable-channel: leak of popt arguments

[lttng-tools.git] / src / common / mi-lttng.cpp

/*
 * Copyright (C) 2014 EfficiOS Inc.
 * Copyright (C) 2016 Jérémie Galarneau <jeremie.galarneau@efficios.com>
 *
 * SPDX-License-Identifier: LGPL-2.1-only
 *
 */

#include "lttng/tracker.h"
#define _LGPL_SOURCE
#include "mi-lttng.hpp"
#include <common/config/session-config.hpp>
#include <common/defaults.hpp>
#include <common/tracker.hpp>
#include <lttng/channel.h>
#include <lttng/snapshot-internal.hpp>


#define MI_SCHEMA_MAJOR_VERSION 4
#define MI_SCHEMA_MINOR_VERSION 1

/* Machine interface namespace URI */
const char * const mi_lttng_xmlns = "xmlns";
const char * const mi_lttng_xmlns_xsi = "xmlns:xsi";
const char * const mi_lttng_w3_schema_uri = "http://www.w3.org/2001/XMLSchema-instance";
const char * const mi_lttng_schema_location = "xsi:schemaLocation";
const char * const mi_lttng_schema_location_uri =
        DEFAULT_LTTNG_MI_NAMESPACE " "
        "https://lttng.org/xml/schemas/lttng-mi/" XSTR(MI_SCHEMA_MAJOR_VERSION)
        "/lttng-mi-" XSTR(MI_SCHEMA_MAJOR_VERSION) "."
        XSTR(MI_SCHEMA_MINOR_VERSION) ".xsd";
const char * const mi_lttng_schema_version = "schemaVersion";
const char * const mi_lttng_schema_version_value = XSTR(MI_SCHEMA_MAJOR_VERSION)
        "." XSTR(MI_SCHEMA_MINOR_VERSION);

/* Strings related to command */
const char * const mi_lttng_element_command = "command";
const char * const mi_lttng_element_command_action = "snapshot_action";
const char * const mi_lttng_element_command_add_context = "add-context";
const char *const mi_lttng_element_command_add_trigger = "add-trigger";
const char * const mi_lttng_element_command_create = "create";
const char * const mi_lttng_element_command_destroy = "destroy";
const char * const mi_lttng_element_command_disable_channel = "disable-channel";
const char * const mi_lttng_element_command_disable_event = "disable-event";
const char * const mi_lttng_element_command_enable_channels = "enable-channel";
const char * const mi_lttng_element_command_enable_event = "enable-event";
const char * const mi_lttng_element_command_list = "list";
const char *const mi_lttng_element_command_list_trigger = "list-trigger";
const char * const mi_lttng_element_command_load = "load";
const char * const mi_lttng_element_command_metadata = "metadata";
const char * const mi_lttng_element_command_metadata_action = "metadata_action";
const char * const mi_lttng_element_command_regenerate = "regenerate";
const char * const mi_lttng_element_command_regenerate_action = "regenerate_action";
const char * const mi_lttng_element_command_name = "name";
const char * const mi_lttng_element_command_output = "output";
const char *const mi_lttng_element_command_remove_trigger = "remove-trigger";
const char * const mi_lttng_element_command_save = "save";
const char * const mi_lttng_element_command_set_session = "set-session";
const char * const mi_lttng_element_command_snapshot = "snapshot";
const char * const mi_lttng_element_command_snapshot_add = "add_snapshot";
const char * const mi_lttng_element_command_snapshot_del = "del_snapshot";
const char * const mi_lttng_element_command_snapshot_list = "list_snapshot";
const char * const mi_lttng_element_command_snapshot_record = "record_snapshot";
const char * const mi_lttng_element_command_start = "start";
const char * const mi_lttng_element_command_stop = "stop";
const char * const mi_lttng_element_command_success = "success";
const char * const mi_lttng_element_command_track = "track";
const char * const mi_lttng_element_command_untrack = "untrack";
const char * const mi_lttng_element_command_version = "version";
const char * const mi_lttng_element_command_rotate = "rotate";
const char * const mi_lttng_element_command_enable_rotation = "enable-rotation";
const char * const mi_lttng_element_command_disable_rotation = "disable-rotation";
const char * const mi_lttng_element_command_clear = "clear";

/* Strings related to version command */
const char * const mi_lttng_element_version = "version";
const char * const mi_lttng_element_version_commit = "commit";
const char * const mi_lttng_element_version_description = "description";
const char * const mi_lttng_element_version_license = "license";
const char * const mi_lttng_element_version_major = "major";
const char * const mi_lttng_element_version_minor = "minor";
const char * const mi_lttng_element_version_patch_level = "patchLevel";
const char * const mi_lttng_element_version_str = "string";
const char * const mi_lttng_element_version_web = "url";

/* String related to a lttng_event_field */
const char * const mi_lttng_element_event_field = "event_field";
const char * const mi_lttng_element_event_fields = "event_fields";

/* String related to lttng_event_perf_counter_ctx */
const char * const mi_lttng_element_perf_counter_context = "perf";

/* Strings related to pid */
const char * const mi_lttng_element_pid_id = "id";

/* Strings related to save command */
const char * const mi_lttng_element_save = "save";

/* Strings related to load command */
const char * const mi_lttng_element_load = "load";
const char * const mi_lttng_element_load_overrides = "overrides";
const char * const mi_lttng_element_load_override_url = "url";

/* General elements of mi_lttng */
const char * const mi_lttng_element_empty = "";
const char * const mi_lttng_element_id = "id";
const char * const mi_lttng_element_nowrite = "nowrite";
const char * const mi_lttng_element_success = "success";
const char * const mi_lttng_element_type_enum = "ENUM";
const char * const mi_lttng_element_type_float = "FLOAT";
const char * const mi_lttng_element_type_integer = "INTEGER";
const char * const mi_lttng_element_type_other = "OTHER";
const char * const mi_lttng_element_type_string = "STRING";

/* String related to loglevel */
const char * const mi_lttng_loglevel_str_alert = "TRACE_ALERT";
const char * const mi_lttng_loglevel_str_crit = "TRACE_CRIT";
const char * const mi_lttng_loglevel_str_debug = "TRACE_DEBUG";
const char * const mi_lttng_loglevel_str_debug_function = "TRACE_DEBUG_FUNCTION";
const char * const mi_lttng_loglevel_str_debug_line = "TRACE_DEBUG_LINE";
const char * const mi_lttng_loglevel_str_debug_module = "TRACE_DEBUG_MODULE";
const char * const mi_lttng_loglevel_str_debug_process = "TRACE_DEBUG_PROCESS";
const char * const mi_lttng_loglevel_str_debug_program = "TRACE_DEBUG_PROGRAM";
const char * const mi_lttng_loglevel_str_debug_system = "TRACE_DEBUG_SYSTEM";
const char * const mi_lttng_loglevel_str_debug_unit = "TRACE_DEBUG_UNIT";
const char * const mi_lttng_loglevel_str_emerg = "TRACE_EMERG";
const char * const mi_lttng_loglevel_str_err = "TRACE_ERR";
const char * const mi_lttng_loglevel_str_info = "TRACE_INFO";
const char * const mi_lttng_loglevel_str_notice = "TRACE_NOTICE";
const char * const mi_lttng_loglevel_str_unknown = "UNKNOWN";
const char * const mi_lttng_loglevel_str_warning = "TRACE_WARNING";

/* String related to loglevel JUL */
const char * const mi_lttng_loglevel_str_jul_all = "JUL_ALL";
const char * const mi_lttng_loglevel_str_jul_config = "JUL_CONFIG";
const char * const mi_lttng_loglevel_str_jul_fine = "JUL_FINE";
const char * const mi_lttng_loglevel_str_jul_finer = "JUL_FINER";
const char * const mi_lttng_loglevel_str_jul_finest = "JUL_FINEST";
const char * const mi_lttng_loglevel_str_jul_info = "JUL_INFO";
const char * const mi_lttng_loglevel_str_jul_off = "JUL_OFF";
const char * const mi_lttng_loglevel_str_jul_severe = "JUL_SEVERE";
const char * const mi_lttng_loglevel_str_jul_warning = "JUL_WARNING";

/* String related to loglevel LOG4J */
const char * const mi_lttng_loglevel_str_log4j_off = "LOG4J_OFF";
const char * const mi_lttng_loglevel_str_log4j_fatal = "LOG4J_FATAL";
const char * const mi_lttng_loglevel_str_log4j_error = "LOG4J_ERROR";
const char * const mi_lttng_loglevel_str_log4j_warn = "LOG4J_WARN";
const char * const mi_lttng_loglevel_str_log4j_info = "LOG4J_INFO";
const char * const mi_lttng_loglevel_str_log4j_debug = "LOG4J_DEBUG";
const char * const mi_lttng_loglevel_str_log4j_trace = "LOG4J_TRACE";
const char * const mi_lttng_loglevel_str_log4j_all = "LOG4J_ALL";

/* String related to loglevel Python */
const char * const mi_lttng_loglevel_str_python_critical = "PYTHON_CRITICAL";
const char * const mi_lttng_loglevel_str_python_error = "PYTHON_ERROR";
const char * const mi_lttng_loglevel_str_python_warning = "PYTHON_WARNING";
const char * const mi_lttng_loglevel_str_python_info = "PYTHON_INFO";
const char * const mi_lttng_loglevel_str_python_debug = "PYTHON_DEBUG";
const char * const mi_lttng_loglevel_str_python_notset = "PYTHON_NOTSET";

/* String related to loglevel type */
const char * const mi_lttng_loglevel_type_all = "ALL";
const char * const mi_lttng_loglevel_type_range = "RANGE";
const char * const mi_lttng_loglevel_type_single = "SINGLE";
const char * const mi_lttng_loglevel_type_unknown = "UNKNOWN";

/* String related to a lttng_snapshot_output */
const char * const mi_lttng_element_snapshot_ctrl_url = "ctrl_url";
const char * const mi_lttng_element_snapshot_data_url = "data_url";
const char * const mi_lttng_element_snapshot_max_size = "max_size";
const char * const mi_lttng_element_snapshot_n_ptr = "n_ptr";
const char * const mi_lttng_element_snapshot_session_name = "session_name";
const char * const mi_lttng_element_snapshots = "snapshots";

/* String related to track/untrack command */
const char * const mi_lttng_element_track_untrack_all_wildcard = "*";

const char * const mi_lttng_element_session_name = "session_name";

/* String related to rotate command */
const char * const mi_lttng_element_rotation = "rotation";
const char * const mi_lttng_element_rotate_status = "status";
const char * const mi_lttng_element_rotation_schedule = "rotation_schedule";
const char * const mi_lttng_element_rotation_schedules = "rotation_schedules";
const char * const mi_lttng_element_rotation_schedule_result = "rotation_schedule_result";
const char * const mi_lttng_element_rotation_schedule_results = "rotation_schedule_results";
const char * const mi_lttng_element_rotation_schedule_periodic = "periodic";
const char * const mi_lttng_element_rotation_schedule_periodic_time_us = "time_us";
const char * const mi_lttng_element_rotation_schedule_size_threshold = "size_threshold";
const char * const mi_lttng_element_rotation_schedule_size_threshold_bytes = "bytes";
const char * const mi_lttng_element_rotation_state = "state";
const char * const mi_lttng_element_rotation_location = "location";
const char * const mi_lttng_element_rotation_location_local = "local";
const char * const mi_lttng_element_rotation_location_local_absolute_path = "absolute_path";
const char * const mi_lttng_element_rotation_location_relay = "relay";
const char * const mi_lttng_element_rotation_location_relay_host = "host";
const char * const mi_lttng_element_rotation_location_relay_control_port = "control_port";
const char * const mi_lttng_element_rotation_location_relay_data_port = "data_port";
const char * const mi_lttng_element_rotation_location_relay_protocol = "protocol";
const char * const mi_lttng_element_rotation_location_relay_relative_path = "relative_path";

/* String related to enum lttng_rotation_state */
const char * const mi_lttng_rotation_state_str_ongoing = "ONGOING";
const char * const mi_lttng_rotation_state_str_completed = "COMPLETED";
const char * const mi_lttng_rotation_state_str_expired = "EXPIRED";
const char * const mi_lttng_rotation_state_str_error = "ERROR";

/* String related to enum lttng_trace_archive_location_relay_protocol_type */
const char * const mi_lttng_rotation_location_relay_protocol_str_tcp = "TCP";

/* String related to rate_policy elements */
const char *const mi_lttng_element_rate_policy = "rate_policy";
const char *const mi_lttng_element_rate_policy_every_n =
                "rate_policy_every_n";
const char *const mi_lttng_element_rate_policy_once_after_n =
                "rate_policy_once_after_n";

const char *const mi_lttng_element_rate_policy_every_n_interval =
                "interval";
const char
                *const mi_lttng_element_rate_policy_once_after_n_threshold =
                                "threshold";

/* String related to action elements */
const char *const mi_lttng_element_action = "action";
const char *const mi_lttng_element_action_list = "action_list";
const char *const mi_lttng_element_action_notify = "action_notify";
const char *const mi_lttng_element_action_start_session =
                "action_start_session";
const char *const mi_lttng_element_action_stop_session =
                "action_stop_session";
const char *const mi_lttng_element_action_rotate_session =
                "action_rotate_session";
const char *const mi_lttng_element_action_snapshot_session =
                "action_snapshot_session";
const char *const mi_lttng_element_action_snapshot_session_output =
                "output";

/* String related to condition */
const char *const mi_lttng_element_condition = "condition";
const char *const mi_lttng_element_condition_buffer_usage_high =
                "condition_buffer_usage_high";
const char *const mi_lttng_element_condition_buffer_usage_low =
                "condition_buffer_usage_low";
const char *const mi_lttng_element_condition_event_rule_matches =
                "condition_event_rule_matches";
const char *const mi_lttng_element_condition_session_consumed_size =
                "condition_session_consumed_size";
const char *const mi_lttng_element_condition_session_rotation =
                "condition_session_rotation";
const char
                *const mi_lttng_element_condition_session_rotation_completed =
                                "condition_session_rotation_completed";
const char
                *const mi_lttng_element_condition_session_rotation_ongoing =
                                "condition_session_rotation_ongoing";

const char *const mi_lttng_element_condition_channel_name =
                "channel_name";
const char *const mi_lttng_element_condition_threshold_bytes =
                "threshold_bytes";
const char *const mi_lttng_element_condition_threshold_ratio =
                "threshold_ratio";

/* String related to capture descriptor */
const char *const mi_lttng_element_capture_descriptor =
                "capture_descriptor";
const char *const mi_lttng_element_capture_descriptors =
                "capture_descriptors";

/* String related to event expression */
const char *const mi_lttng_element_event_expr = "event_expr";
const char *const mi_lttng_element_event_expr_payload_field =
                "event_expr_payload_field";
const char *const mi_lttng_element_event_expr_channel_context_field =
                "event_expr_channel_context_field";
const char
                *const mi_lttng_element_event_expr_app_specific_context_field =
                                "event_expr_app_specific_context_field";
const char *const mi_lttng_element_event_expr_array_field_element =
                "event_expr_array_field_element";
const char *const mi_lttng_element_event_expr_provider_name =
                "provider_name";
const char *const mi_lttng_element_event_expr_type_name =
                "type_name";
const char *const mi_lttng_element_event_expr_index = "index";

/* String related to event rule */
const char *const mi_lttng_element_event_rule = "event_rule";

/* String related to lttng_event_rule_type */
const char *const mi_lttng_element_event_rule_event_name =
                "event_name";
const char *const mi_lttng_element_event_rule_name_pattern =
                "name_pattern";
const char *const mi_lttng_element_event_rule_filter_expression =
                "filter_expression";

const char *const mi_lttng_element_event_rule_jul_logging =
                "event_rule_jul_logging";
const char *const mi_lttng_element_event_rule_kernel_kprobe =
                "event_rule_kernel_kprobe";
const char *const mi_lttng_element_event_rule_kernel_syscall =
                "event_rule_kernel_syscall";
const char *const mi_lttng_element_event_rule_kernel_tracepoint =
                "event_rule_kernel_tracepoint";
const char *const mi_lttng_element_event_rule_kernel_uprobe =
                "event_rule_kernel_uprobe";
const char *const mi_lttng_element_event_rule_log4j_logging =
                "event_rule_log4j_logging";
const char *const mi_lttng_element_event_rule_python_logging =
                "event_rule_python_logging";
const char *const mi_lttng_element_event_rule_user_tracepoint =
                "event_rule_user_tracepoint";

/* String related to lttng_event_rule_kernel_syscall. */
const char *const
                mi_lttng_element_event_rule_kernel_syscall_emission_site =
                                "emission_site";

/* String related to enum lttng_event_rule_kernel_syscall_emission_site. */
const char *const
                mi_lttng_event_rule_kernel_syscall_emission_site_entry_exit =
                                "entry+exit";
const char
                *const mi_lttng_event_rule_kernel_syscall_emission_site_entry =
                                "entry";
const char *const
                mi_lttng_event_rule_kernel_syscall_emission_site_exit = "exit";

/* String related to lttng_event_rule_user_tracepoint */
const char *const
                mi_lttng_element_event_rule_user_tracepoint_name_pattern_exclusions =
                                "name_pattern_exclusions";
const char *const
                mi_lttng_element_event_rule_user_tracepoint_name_pattern_exclusion =
                                "name_pattern_exclusion";

/* String related to log level rule. */
const char *const mi_lttng_element_log_level_rule =
                "log_level_rule";
const char *const mi_lttng_element_log_level_rule_exactly =
                "log_level_rule_exactly";
const char
                *const mi_lttng_element_log_level_rule_at_least_as_severe_as =
                                "log_level_rule_at_least_as_severe_as";
const char *const mi_lttng_element_log_level_rule_level = "level";

/* String related to kernel probe location. */
const char *const mi_lttng_element_kernel_probe_location =
                "kernel_probe_location";
const char
                *const mi_lttng_element_kernel_probe_location_symbol_offset =
                                "kernel_probe_location_symbol_offset";
const char *const
                mi_lttng_element_kernel_probe_location_symbol_offset_name =
                                "name";
const char *const
                mi_lttng_element_kernel_probe_location_symbol_offset_offset =
                                "offset";

const char *const mi_lttng_element_kernel_probe_location_address =
                "kernel_probe_location_address";
const char
                *const mi_lttng_element_kernel_probe_location_address_address =
                                "address";

/* String related to userspace probe location. */
const char *const mi_lttng_element_userspace_probe_location =
                "userspace_probe_location";
const char
                *const mi_lttng_element_userspace_probe_location_binary_path =
                                "binary_path";
const char
                *const mi_lttng_element_userspace_probe_location_function =
                                "userspace_probe_location_function";
const char
                *const mi_lttng_element_userspace_probe_location_function_name =
                                "name";
const char
                *const mi_lttng_element_userspace_probe_location_lookup_method =
                                "userspace_probe_location_lookup_method";
const char *const
                mi_lttng_element_userspace_probe_location_lookup_method_function_default =
                                "userspace_probe_location_lookup_method_function_default";
const char *const
                mi_lttng_element_userspace_probe_location_lookup_method_function_elf =
                                "userspace_probe_location_lookup_method_function_elf";
const char *const
                mi_lttng_element_userspace_probe_location_lookup_method_tracepoint_sdt =
                                "userspace_probe_location_lookup_method_tracepoint_sdt";
const char
                *const mi_lttng_element_userspace_probe_location_tracepoint =
                                "userspace_probe_location_tracepoint";
const char *const
                mi_lttng_element_userspace_probe_location_tracepoint_probe_name =
                                "probe_name";
const char *const
                mi_lttng_element_userspace_probe_location_tracepoint_provider_name =
                                "provider_name";

/* String related to enum
 * lttng_userspace_probe_location_function_instrumentation_type */
const char *const
                mi_lttng_element_userspace_probe_location_function_instrumentation_type =
                                "instrumentation_type";
const char *const
                mi_lttng_userspace_probe_location_function_instrumentation_type_entry =
                                "ENTRY";

/* String related to trigger */
const char *const mi_lttng_element_triggers = "triggers";
const char *const mi_lttng_element_trigger = "trigger";
const char *const mi_lttng_element_trigger_owner_uid = "owner_uid";

/* String related to error_query. */
const char *const mi_lttng_element_error_query_result =
                "error_query_result";
const char *const mi_lttng_element_error_query_result_counter =
                "error_query_result_counter";
const char *const
                mi_lttng_element_error_query_result_counter_value = "value";
const char *const mi_lttng_element_error_query_result_description =
                "description";
const char *const mi_lttng_element_error_query_result_name =
                "name";
const char *const mi_lttng_element_error_query_result_type =
                "type";
const char *const mi_lttng_element_error_query_results =
                "error_query_results";

/* String related to add-context command */
const char * const mi_lttng_element_context_symbol = "symbol";

/* Deprecated symbols preserved for ABI compatibility. */
LTTNG_EXPORT const char *mi_lttng_context_type_perf_counter;
LTTNG_EXPORT const char *mi_lttng_context_type_perf_cpu_counter;
LTTNG_EXPORT const char *mi_lttng_context_type_perf_thread_counter;
LTTNG_EXPORT const char *mi_lttng_element_track_untrack_pid_target;
LTTNG_EXPORT const char *mi_lttng_element_track_untrack_targets;
LTTNG_EXPORT const char *mi_lttng_element_calibrate;
LTTNG_EXPORT const char *mi_lttng_element_calibrate_function;
LTTNG_EXPORT const char *mi_lttng_element_command_calibrate;

/* This is a merge of jul loglevel and regular loglevel
 * Those should never overlap by definition
 * (see struct lttng_event loglevel)
 */
const char *mi_lttng_loglevel_string(int value, enum lttng_domain_type domain)
{
        switch (domain) {
        case LTTNG_DOMAIN_KERNEL:
        case LTTNG_DOMAIN_UST:
                switch (value) {
                case -1:
                        return mi_lttng_element_empty;
                case LTTNG_LOGLEVEL_EMERG:
                        return mi_lttng_loglevel_str_emerg;
                case LTTNG_LOGLEVEL_ALERT:
                        return mi_lttng_loglevel_str_alert;
                case LTTNG_LOGLEVEL_CRIT:
                        return mi_lttng_loglevel_str_crit;
                case LTTNG_LOGLEVEL_ERR:
                        return mi_lttng_loglevel_str_err;
                case LTTNG_LOGLEVEL_WARNING:
                        return mi_lttng_loglevel_str_warning;
                case LTTNG_LOGLEVEL_NOTICE:
                        return mi_lttng_loglevel_str_notice;
                case LTTNG_LOGLEVEL_INFO:
                        return mi_lttng_loglevel_str_info;
                case LTTNG_LOGLEVEL_DEBUG_SYSTEM:
                        return mi_lttng_loglevel_str_debug_system;
                case LTTNG_LOGLEVEL_DEBUG_PROGRAM:
                        return mi_lttng_loglevel_str_debug_program;
                case LTTNG_LOGLEVEL_DEBUG_PROCESS:
                        return mi_lttng_loglevel_str_debug_process;
                case LTTNG_LOGLEVEL_DEBUG_MODULE:
                        return mi_lttng_loglevel_str_debug_module;
                case LTTNG_LOGLEVEL_DEBUG_UNIT:
                        return mi_lttng_loglevel_str_debug_unit;
                case LTTNG_LOGLEVEL_DEBUG_FUNCTION:
                        return mi_lttng_loglevel_str_debug_function;
                case LTTNG_LOGLEVEL_DEBUG_LINE:
                        return mi_lttng_loglevel_str_debug_line;
                case LTTNG_LOGLEVEL_DEBUG:
                        return mi_lttng_loglevel_str_debug;
                default:
                        return mi_lttng_loglevel_str_unknown;
                }
                break;
        case LTTNG_DOMAIN_LOG4J:
                switch (value) {
                case -1:
                        return mi_lttng_element_empty;
                case LTTNG_LOGLEVEL_LOG4J_OFF:
                        return mi_lttng_loglevel_str_log4j_off;
                case LTTNG_LOGLEVEL_LOG4J_FATAL:
                        return mi_lttng_loglevel_str_log4j_fatal;
                case LTTNG_LOGLEVEL_LOG4J_ERROR:
                        return mi_lttng_loglevel_str_log4j_error;
                case LTTNG_LOGLEVEL_LOG4J_WARN:
                        return mi_lttng_loglevel_str_log4j_warn;
                case LTTNG_LOGLEVEL_LOG4J_INFO:
                        return mi_lttng_loglevel_str_log4j_info;
                case LTTNG_LOGLEVEL_LOG4J_DEBUG:
                        return mi_lttng_loglevel_str_log4j_debug;
                case LTTNG_LOGLEVEL_LOG4J_TRACE:
                        return mi_lttng_loglevel_str_log4j_trace;
                case LTTNG_LOGLEVEL_LOG4J_ALL:
                        return mi_lttng_loglevel_str_log4j_all;
                default:
                        return mi_lttng_loglevel_str_unknown;
                }
                break;
        case LTTNG_DOMAIN_JUL:
                switch (value) {
                case -1:
                        return mi_lttng_element_empty;
                case LTTNG_LOGLEVEL_JUL_OFF:
                        return mi_lttng_loglevel_str_jul_off;
                case LTTNG_LOGLEVEL_JUL_SEVERE:
                        return mi_lttng_loglevel_str_jul_severe;
                case LTTNG_LOGLEVEL_JUL_WARNING:
                        return mi_lttng_loglevel_str_jul_warning;
                case LTTNG_LOGLEVEL_JUL_INFO:
                        return mi_lttng_loglevel_str_jul_info;
                case LTTNG_LOGLEVEL_JUL_CONFIG:
                        return mi_lttng_loglevel_str_jul_config;
                case LTTNG_LOGLEVEL_JUL_FINE:
                        return mi_lttng_loglevel_str_jul_fine;
                case LTTNG_LOGLEVEL_JUL_FINER:
                        return mi_lttng_loglevel_str_jul_finer;
                case LTTNG_LOGLEVEL_JUL_FINEST:
                        return mi_lttng_loglevel_str_jul_finest;
                case LTTNG_LOGLEVEL_JUL_ALL:
                        return mi_lttng_loglevel_str_jul_all;
                default:
                        return mi_lttng_loglevel_str_unknown;
                }
                break;
        case LTTNG_DOMAIN_PYTHON:
                switch (value) {
                case LTTNG_LOGLEVEL_PYTHON_CRITICAL:
                        return mi_lttng_loglevel_str_python_critical;
                case LTTNG_LOGLEVEL_PYTHON_ERROR:
                        return mi_lttng_loglevel_str_python_error;
                case LTTNG_LOGLEVEL_PYTHON_WARNING:
                        return mi_lttng_loglevel_str_python_warning;
                case LTTNG_LOGLEVEL_PYTHON_INFO:
                        return mi_lttng_loglevel_str_python_info;
                case LTTNG_LOGLEVEL_PYTHON_DEBUG:
                        return mi_lttng_loglevel_str_python_debug;
                case LTTNG_LOGLEVEL_PYTHON_NOTSET:
                        return mi_lttng_loglevel_str_python_notset;
                default:
                        return mi_lttng_loglevel_str_unknown;
                }
                break;
        default:
                return mi_lttng_loglevel_str_unknown;
        }
}

const char *mi_lttng_logleveltype_string(enum lttng_loglevel_type value)
{
        switch (value) {
        case LTTNG_EVENT_LOGLEVEL_ALL:
                return mi_lttng_loglevel_type_all;
        case LTTNG_EVENT_LOGLEVEL_RANGE:
                return mi_lttng_loglevel_type_range;
        case LTTNG_EVENT_LOGLEVEL_SINGLE:
                return mi_lttng_loglevel_type_single;
        default:
                return mi_lttng_loglevel_type_unknown;
        }
}

static
const char *mi_lttng_eventtype_string(enum lttng_event_type value)
{
        switch (value) {
        case LTTNG_EVENT_ALL:
                return config_event_type_all;
        case LTTNG_EVENT_TRACEPOINT:
                return config_event_type_tracepoint;
        case LTTNG_EVENT_PROBE:
                return config_event_type_probe;
        case LTTNG_EVENT_USERSPACE_PROBE:
                return config_event_type_userspace_probe;
        case LTTNG_EVENT_FUNCTION:
                return config_event_type_function;
        case LTTNG_EVENT_FUNCTION_ENTRY:
                return config_event_type_function_entry;
        case LTTNG_EVENT_SYSCALL:
                return config_event_type_syscall;
        case LTTNG_EVENT_NOOP:
                return config_event_type_noop;
        default:
                return mi_lttng_element_empty;
        }
}

static
const char *mi_lttng_event_contexttype_string(enum lttng_event_context_type val)
{
        switch (val) {
        case LTTNG_EVENT_CONTEXT_PID:
                return config_event_context_pid;
        case LTTNG_EVENT_CONTEXT_PROCNAME:
                return config_event_context_procname;
        case LTTNG_EVENT_CONTEXT_PRIO:
                return config_event_context_prio;
        case LTTNG_EVENT_CONTEXT_NICE:
                return config_event_context_nice;
        case LTTNG_EVENT_CONTEXT_VPID:
                return config_event_context_vpid;
        case LTTNG_EVENT_CONTEXT_TID:
                return config_event_context_tid;
        case LTTNG_EVENT_CONTEXT_VTID:
                return config_event_context_vtid;
        case LTTNG_EVENT_CONTEXT_PPID:
                return config_event_context_ppid;
        case LTTNG_EVENT_CONTEXT_VPPID:
                return config_event_context_vppid;
        case LTTNG_EVENT_CONTEXT_PTHREAD_ID:
                return config_event_context_pthread_id;
        case LTTNG_EVENT_CONTEXT_HOSTNAME:
                return config_event_context_hostname;
        case LTTNG_EVENT_CONTEXT_IP:
                return config_event_context_ip;
        case LTTNG_EVENT_CONTEXT_INTERRUPTIBLE:
                return config_event_context_interruptible;
        case LTTNG_EVENT_CONTEXT_PREEMPTIBLE:
                return config_event_context_preemptible;
        case LTTNG_EVENT_CONTEXT_NEED_RESCHEDULE:
                return config_event_context_need_reschedule;
        case LTTNG_EVENT_CONTEXT_MIGRATABLE:
                return config_event_context_migratable;
        case LTTNG_EVENT_CONTEXT_CALLSTACK_USER:
                return config_event_context_callstack_user;
        case LTTNG_EVENT_CONTEXT_CALLSTACK_KERNEL:
                return config_event_context_callstack_kernel;
        case LTTNG_EVENT_CONTEXT_CGROUP_NS:
                return config_event_context_cgroup_ns;
        case LTTNG_EVENT_CONTEXT_IPC_NS:
                return config_event_context_ipc_ns;
        case LTTNG_EVENT_CONTEXT_MNT_NS:
                return config_event_context_mnt_ns;
        case LTTNG_EVENT_CONTEXT_NET_NS:
                return config_event_context_net_ns;
        case LTTNG_EVENT_CONTEXT_PID_NS:
                return config_event_context_pid_ns;
        case LTTNG_EVENT_CONTEXT_TIME_NS:
                return config_event_context_time_ns;
        case LTTNG_EVENT_CONTEXT_USER_NS:
                return config_event_context_user_ns;
        case LTTNG_EVENT_CONTEXT_UTS_NS:
                return config_event_context_uts_ns;
        case LTTNG_EVENT_CONTEXT_UID:
                return config_event_context_uid;
        case LTTNG_EVENT_CONTEXT_EUID:
                return config_event_context_euid;
        case LTTNG_EVENT_CONTEXT_SUID:
                return config_event_context_suid;
        case LTTNG_EVENT_CONTEXT_GID:
                return config_event_context_gid;
        case LTTNG_EVENT_CONTEXT_EGID:
                return config_event_context_egid;
        case LTTNG_EVENT_CONTEXT_SGID:
                return config_event_context_sgid;
        case LTTNG_EVENT_CONTEXT_VUID:
                return config_event_context_vuid;
        case LTTNG_EVENT_CONTEXT_VEUID:
                return config_event_context_veuid;
        case LTTNG_EVENT_CONTEXT_VSUID:
                return config_event_context_vsuid;
        case LTTNG_EVENT_CONTEXT_VGID:
                return config_event_context_vgid;
        case LTTNG_EVENT_CONTEXT_VEGID:
                return config_event_context_vegid;
        case LTTNG_EVENT_CONTEXT_VSGID:
                return config_event_context_vsgid;
        default:
                return NULL;
        }
}

const char *mi_lttng_eventfieldtype_string(enum lttng_event_field_type val)
{
        switch (val) {
        case(LTTNG_EVENT_FIELD_INTEGER):
                return mi_lttng_element_type_integer;
        case(LTTNG_EVENT_FIELD_ENUM):
                return mi_lttng_element_type_enum;
        case(LTTNG_EVENT_FIELD_FLOAT):
                return mi_lttng_element_type_float;
        case(LTTNG_EVENT_FIELD_STRING):
                return mi_lttng_element_type_string;
        default:
                return mi_lttng_element_type_other;
        }
}

const char *mi_lttng_domaintype_string(enum lttng_domain_type value)
{
        switch (value) {
        case LTTNG_DOMAIN_KERNEL:
                return config_domain_type_kernel;
        case LTTNG_DOMAIN_UST:
                return config_domain_type_ust;
        case LTTNG_DOMAIN_JUL:
                return config_domain_type_jul;
        case LTTNG_DOMAIN_LOG4J:
                return config_domain_type_log4j;
        case LTTNG_DOMAIN_PYTHON:
                return config_domain_type_python;
        default:
                /* Should not have an unknown domain */
                abort();
                return NULL;
        }
}

const char *mi_lttng_buffertype_string(enum lttng_buffer_type value)
{
        switch (value) {
        case LTTNG_BUFFER_PER_PID:
                return config_buffer_type_per_pid;
        case LTTNG_BUFFER_PER_UID:
                return config_buffer_type_per_uid;
        case LTTNG_BUFFER_GLOBAL:
                return config_buffer_type_global;
        default:
                /* Should not have an unknow buffer type */
                abort();
                return NULL;
        }
}

const char *mi_lttng_rotation_state_string(enum lttng_rotation_state value)
{
        switch (value) {
        case LTTNG_ROTATION_STATE_ONGOING:
                return mi_lttng_rotation_state_str_ongoing;
        case LTTNG_ROTATION_STATE_COMPLETED:
                return mi_lttng_rotation_state_str_completed;
        case LTTNG_ROTATION_STATE_EXPIRED:
                return mi_lttng_rotation_state_str_expired;
        case LTTNG_ROTATION_STATE_ERROR:
                return mi_lttng_rotation_state_str_error;
        default:
                /* Should not have an unknow rotation state. */
                abort();
                return NULL;
        }
}

const char *mi_lttng_trace_archive_location_relay_protocol_type_string(
                enum lttng_trace_archive_location_relay_protocol_type value)
{
        switch (value) {
        case LTTNG_TRACE_ARCHIVE_LOCATION_RELAY_PROTOCOL_TYPE_TCP:
                return mi_lttng_rotation_location_relay_protocol_str_tcp;
        default:
                /* Should not have an unknown relay protocol. */
                abort();
                return NULL;
        }
}

struct mi_writer *mi_lttng_writer_create(int fd_output, int mi_output_type)
{
        struct mi_writer *mi_writer;

        mi_writer = zmalloc<struct mi_writer>();
        if (!mi_writer) {
                PERROR("zmalloc mi_writer_create");
                goto end;
        }
        if (mi_output_type == LTTNG_MI_XML) {
                mi_writer->writer = config_writer_create(fd_output, 0);
                if (!mi_writer->writer) {
                        goto err_destroy;
                }
                mi_writer->type = LTTNG_MI_XML;
        } else {
                goto err_destroy;
        }

end:
        return mi_writer;

err_destroy:
        free(mi_writer);
        return NULL;
}

int mi_lttng_writer_destroy(struct mi_writer *writer)
{
        int ret;

        if (!writer) {
                ret = -EINVAL;
                goto end;
        }

        ret = config_writer_destroy(writer->writer);
        if (ret < 0) {
                goto end;
        }

        free(writer);
end:
        return ret;
}

int mi_lttng_writer_command_open(struct mi_writer *writer, const char *command)
{
        int ret;

        /*
         * A command is always the MI's root node, it must declare the current
         * namespace and schema URIs and the schema's version.
         */
        ret = config_writer_open_element(writer->writer,
                        mi_lttng_element_command);
        if (ret) {
                goto end;
        }

        ret = config_writer_write_attribute(writer->writer,
                        mi_lttng_xmlns, DEFAULT_LTTNG_MI_NAMESPACE);
        if (ret) {
                goto end;
        }

        ret = config_writer_write_attribute(writer->writer,
                        mi_lttng_xmlns_xsi, mi_lttng_w3_schema_uri);
        if (ret) {
                goto end;
        }

        ret = config_writer_write_attribute(writer->writer,
                        mi_lttng_schema_location,
                        mi_lttng_schema_location_uri);
        if (ret) {
                goto end;
        }

        ret = config_writer_write_attribute(writer->writer,
                        mi_lttng_schema_version,
                        mi_lttng_schema_version_value);
        if (ret) {
                goto end;
        }

        ret = mi_lttng_writer_write_element_string(writer,
                        mi_lttng_element_command_name, command);
end:
        return ret;
}

int mi_lttng_writer_command_close(struct mi_writer *writer)
{
        return mi_lttng_writer_close_element(writer);
}

int mi_lttng_writer_open_element(struct mi_writer *writer,
                const char *element_name)
{
        return config_writer_open_element(writer->writer, element_name);
}

int mi_lttng_writer_close_element(struct mi_writer *writer)
{
        return config_writer_close_element(writer->writer);
}

int mi_lttng_close_multi_element(struct mi_writer *writer,
                unsigned int nb_element)
{
        int ret, i;

        if (nb_element < 1) {
                ret = 0;
                goto end;
        }
        for (i = 0; i < nb_element; i++) {
                ret = mi_lttng_writer_close_element(writer);
                if (ret) {
                        goto end;
                }
        }
end:
        return ret;
}

int mi_lttng_writer_write_element_unsigned_int(struct mi_writer *writer,
                const char *element_name, uint64_t value)
{
        return config_writer_write_element_unsigned_int(writer->writer,
                        element_name, value);
}

int mi_lttng_writer_write_element_signed_int(struct mi_writer *writer,
                const char *element_name, int64_t value)
{
        return config_writer_write_element_signed_int(writer->writer,
                        element_name, value);
}

int mi_lttng_writer_write_element_bool(struct mi_writer *writer,
                const char *element_name, int value)
{
        return config_writer_write_element_bool(writer->writer,
                        element_name, value);
}

int mi_lttng_writer_write_element_string(struct mi_writer *writer,
                const char *element_name, const char *value)
{
        return config_writer_write_element_string(writer->writer,
                        element_name, value);
}

int mi_lttng_writer_write_element_double(struct mi_writer *writer,
                const char *element_name,
                double value)
{
        return config_writer_write_element_double(
                        writer->writer, element_name, value);
}

int mi_lttng_version(struct mi_writer *writer, struct mi_lttng_version_data *version,
        const char *lttng_description, const char *lttng_license)
{
        int ret;

        /* Open version */
        ret = mi_lttng_writer_open_element(writer, mi_lttng_element_version);
        if (ret) {
                goto end;
        }

        /* Version string (contain info like rc etc.) */
        ret = mi_lttng_writer_write_element_string(writer,
                        mi_lttng_element_version_str, version->version);
        if (ret) {
                goto end;
        }

        /* Major version number */
        ret = mi_lttng_writer_write_element_unsigned_int(writer,
                        mi_lttng_element_version_major, version->version_major);
        if (ret) {
                goto end;
        }

        /* Minor version number */
        ret = mi_lttng_writer_write_element_unsigned_int(writer,
                        mi_lttng_element_version_minor, version->version_minor);
        if (ret) {
                goto end;
        }

        /* Commit version number */
        ret = mi_lttng_writer_write_element_string(writer,
                        mi_lttng_element_version_commit, version->version_commit);
        if (ret) {
                goto end;
        }

        /* Patch number */
        ret = mi_lttng_writer_write_element_unsigned_int(writer,
                        mi_lttng_element_version_patch_level, version->version_patchlevel);
        if (ret) {
                goto end;
        }

        /* Name of the version */
        ret = mi_lttng_writer_write_element_string(writer,
                        config_element_name, version->version_name);
        if (ret) {
                goto end;
        }

        /* Description mostly related to beer... */
        ret = mi_lttng_writer_write_element_string(writer,
                        mi_lttng_element_version_description, lttng_description);
        if (ret) {
                goto end;
        }

        /* url */
        ret = mi_lttng_writer_write_element_string(writer,
                        mi_lttng_element_version_web, version->package_url);
        if (ret) {
                goto end;
        }

        /* License: free as in free beer...no...*speech* */
        ret = mi_lttng_writer_write_element_string(writer,
                        mi_lttng_element_version_license, lttng_license);
        if (ret) {
                goto end;
        }

        /* Close version element */
        ret = mi_lttng_writer_close_element(writer);

end:
        return ret;
}

int mi_lttng_sessions_open(struct mi_writer *writer)
{
        return mi_lttng_writer_open_element(writer, config_element_sessions);
}

int mi_lttng_session(struct mi_writer *writer,
                struct lttng_session *session, int is_open)
{
        int ret;

        LTTNG_ASSERT(session);

        /* Open sessions element */
        ret = mi_lttng_writer_open_element(writer,
                        config_element_session);
        if (ret) {
                goto end;
        }

        /* Name of the session */
        ret = mi_lttng_writer_write_element_string(writer,
                        config_element_name, session->name);
        if (ret) {
                goto end;
        }

        /* Path */
        ret = mi_lttng_writer_write_element_string(writer,
                        config_element_path, session->path);
        if (ret) {
                goto end;
        }

        /* Enabled ? */
        ret = mi_lttng_writer_write_element_bool(writer,
                        config_element_enabled, session->enabled);
        if (ret) {
                goto end;
        }

        /* Snapshot mode */
        ret = mi_lttng_writer_write_element_unsigned_int(writer,
                        config_element_snapshot_mode, session->snapshot_mode);
        if (ret) {
                goto end;
        }

        /* Live timer interval in usec */
        ret = mi_lttng_writer_write_element_unsigned_int(writer,
                        config_element_live_timer_interval,
                        session->live_timer_interval);
        if (ret) {
                goto end;
        }

        if (!is_open) {
                /* Closing session element */
                ret = mi_lttng_writer_close_element(writer);
        }
end:
        return ret;

}

int mi_lttng_domains_open(struct mi_writer *writer)
{
        return mi_lttng_writer_open_element(writer, config_element_domains);
}

int mi_lttng_domain(struct mi_writer *writer,
                struct lttng_domain *domain, int is_open)
{
        int ret = 0;
        const char *str_domain;
        const char *str_buffer;

        LTTNG_ASSERT(domain);

        /* Open domain element */
        ret = mi_lttng_writer_open_element(writer, config_element_domain);
        if (ret) {
                goto end;
        }

        /* Domain Type */
        str_domain = mi_lttng_domaintype_string(domain->type);
        ret = mi_lttng_writer_write_element_string(writer, config_element_type,
                        str_domain);
        if (ret) {
                goto end;
        }

        /* Buffer Type */
        str_buffer= mi_lttng_buffertype_string(domain->buf_type);
        ret = mi_lttng_writer_write_element_string(writer,
                        config_element_buffer_type, str_buffer);
        if (ret) {
                goto end;
        }

        /* TODO: union  attr
         * This union is not currently used and was added for
         * future ust domain support.
         * Date: 25-06-2014
         * */

        if (!is_open) {
                /* Closing domain element */
                ret = mi_lttng_writer_close_element(writer);
        }

end:
        return ret;

}

int mi_lttng_channels_open(struct mi_writer *writer)
{
        return mi_lttng_writer_open_element(writer, config_element_channels);
}

int mi_lttng_channel(struct mi_writer *writer,
                struct lttng_channel *channel, int is_open)
{
        int ret = 0;

        LTTNG_ASSERT(channel);

        /* Opening channel element */
        ret = mi_lttng_writer_open_element(writer, config_element_channel);
        if (ret) {
                goto end;
        }

        /* Name */
        ret = mi_lttng_writer_write_element_string(writer, config_element_name,
                        channel->name);
        if (ret) {
                goto end;
        }

        /* Enabled ? */
        ret = mi_lttng_writer_write_element_bool(writer,
                        config_element_enabled, channel->enabled);
        if (ret) {
                goto end;
        }

        /* Attribute */
        ret = mi_lttng_channel_attr(writer, &channel->attr);
        if (ret) {
                goto end;
        }

        if (!is_open) {
                /* Closing channel element */
                ret = mi_lttng_writer_close_element(writer);
                if (ret) {
                        goto end;
                }
        }
end:
        return ret;
}

int mi_lttng_channel_attr(struct mi_writer *writer,
                struct lttng_channel_attr *attr)
{
        int ret = 0;
        struct lttng_channel *chan = caa_container_of(attr,
                        struct lttng_channel, attr);
        uint64_t discarded_events, lost_packets, monitor_timer_interval;
        int64_t blocking_timeout;

        LTTNG_ASSERT(attr);

        ret = lttng_channel_get_discarded_event_count(chan, &discarded_events);
        if (ret) {
                goto end;
        }

        ret = lttng_channel_get_lost_packet_count(chan, &lost_packets);
        if (ret) {
                goto end;
        }

        ret = lttng_channel_get_monitor_timer_interval(chan,
                        &monitor_timer_interval);
        if (ret) {
                goto end;
        }

        ret = lttng_channel_get_blocking_timeout(chan,
                        &blocking_timeout);
        if (ret) {
                goto end;
        }

        /* Opening Attributes */
        ret = mi_lttng_writer_open_element(writer, config_element_attributes);
        if (ret) {
                goto end;
        }

        /* Overwrite */
        ret = mi_lttng_writer_write_element_string(writer,
                config_element_overwrite_mode,
                attr->overwrite ? config_overwrite_mode_overwrite :
                        config_overwrite_mode_discard);
        if (ret) {
                goto end;
        }

        /* Sub buffer size in byte */
        ret = mi_lttng_writer_write_element_unsigned_int(writer,
                config_element_subbuf_size, attr->subbuf_size);
        if (ret) {
                goto end;
        }

        /* Number of subbuffer (power of two) */
        ret = mi_lttng_writer_write_element_unsigned_int(writer,
                config_element_num_subbuf,
                attr->num_subbuf);
        if (ret) {
                goto end;
        }

        /* Switch timer interval in usec */
        ret = mi_lttng_writer_write_element_unsigned_int(writer,
                config_element_switch_timer_interval,
                attr->switch_timer_interval);
        if (ret) {
                goto end;
        }

        /* Read timer interval in usec */
        ret = mi_lttng_writer_write_element_unsigned_int(writer,
                config_element_read_timer_interval,
                attr->read_timer_interval);
        if (ret) {
                goto end;
        }

        /* Monitor timer interval in usec */
        ret = mi_lttng_writer_write_element_unsigned_int(writer,
                config_element_monitor_timer_interval,
                monitor_timer_interval);
        if (ret) {
                goto end;
        }

        /* Retry timeout in usec */
        ret = mi_lttng_writer_write_element_signed_int(writer,
                config_element_blocking_timeout,
                blocking_timeout);
        if (ret) {
                goto end;
        }

        /* Event output */
        ret = mi_lttng_writer_write_element_string(writer,
                config_element_output_type,
                attr->output == LTTNG_EVENT_SPLICE ?
                config_output_type_splice : config_output_type_mmap);
        if (ret) {
                goto end;
        }

        /* Tracefile size in bytes */
        ret = mi_lttng_writer_write_element_unsigned_int(writer,
                config_element_tracefile_size, attr->tracefile_size);
        if (ret) {
                goto end;
        }

        /* Count of tracefiles */
        ret = mi_lttng_writer_write_element_unsigned_int(writer,
                config_element_tracefile_count,
                attr->tracefile_count);
        if (ret) {
                goto end;
        }

        /* Live timer interval in usec*/
        ret = mi_lttng_writer_write_element_unsigned_int(writer,
                config_element_live_timer_interval,
                attr->live_timer_interval);
        if (ret) {
                goto end;
        }

        /* Discarded events */
        ret = mi_lttng_writer_write_element_unsigned_int(writer,
                config_element_discarded_events,
                discarded_events);
        if (ret) {
                goto end;
        }

        /* Lost packets */
        ret = mi_lttng_writer_write_element_unsigned_int(writer,
                config_element_lost_packets,
                lost_packets);
        if (ret) {
                goto end;
        }

        /* Closing attributes */
        ret = mi_lttng_writer_close_element(writer);
        if (ret) {
                goto end;
        }
end:
        return ret;

}

int mi_lttng_event_common_attributes(struct mi_writer *writer,
                struct lttng_event *event)
{
        int ret;
        const char *filter_expression;

        /* Open event element */
        ret = mi_lttng_writer_open_element(writer, config_element_event);
        if (ret) {
                goto end;
        }

        /* Event name */
        ret = mi_lttng_writer_write_element_string(writer,
                        config_element_name, event->name);
        if (ret) {
                goto end;
        }

        /* Event type */
        ret = mi_lttng_writer_write_element_string(writer,
                        config_element_type, mi_lttng_eventtype_string(event->type));
        if (ret) {
                goto end;
        }

        /* Is event enabled */
        ret = mi_lttng_writer_write_element_bool(writer,
                        config_element_enabled, event->enabled);
        if (ret) {
                goto end;
        }

        /* Event filter expression */
        ret = lttng_event_get_filter_expression(event, &filter_expression);
        if (ret) {
                goto end;
        }

        if (filter_expression) {
                ret = mi_lttng_writer_write_element_string(writer,
                                config_element_filter_expression,
                                filter_expression);
                if (ret) {
                        goto end;
                }
        }

end:
        return ret;
}

static int write_event_exclusions(struct mi_writer *writer,
                struct lttng_event *event)
{
        int i;
        int ret;
        int exclusion_count;

        /* Open event exclusions */
        ret = mi_lttng_writer_open_element(writer, config_element_exclusions);
        if (ret) {
                goto end;
        }

        exclusion_count = lttng_event_get_exclusion_name_count(event);
        if (exclusion_count < 0) {
                ret = exclusion_count;
                goto end;
        }

        for (i = 0; i < exclusion_count; i++) {
                const char *name;

                ret = lttng_event_get_exclusion_name(event, i, &name);
                if (ret) {
                        /* Close exclusions */
                        mi_lttng_writer_close_element(writer);
                        goto end;
                }

                ret = mi_lttng_writer_write_element_string(writer,
                                config_element_exclusion, name);
                if (ret) {
                        /* Close exclusions */
                        mi_lttng_writer_close_element(writer);
                        goto end;
                }
        }

        /* Close exclusions */
        ret = mi_lttng_writer_close_element(writer);

end:
        return ret;
}

int mi_lttng_event_tracepoint_loglevel(struct mi_writer *writer,
                struct lttng_event *event, enum lttng_domain_type domain)
{
        int ret;

        /* Event loglevel */
        ret = mi_lttng_writer_write_element_string(writer,
                        config_element_loglevel,
                        mi_lttng_loglevel_string(event->loglevel, domain));
        if (ret) {
                goto end;
        }

        /* Log level type */
        ret = mi_lttng_writer_write_element_string(writer,
                        config_element_loglevel_type,
                        mi_lttng_logleveltype_string(event->loglevel_type));
        if (ret) {
                goto end;
        }

        /* Event exclusions */
        ret = write_event_exclusions(writer, event);

end:
        return ret;
}

int mi_lttng_event_tracepoint_no_loglevel(struct mi_writer *writer,
                struct lttng_event *event)
{
        /* event exclusion filter */
        return write_event_exclusions(writer, event);
}

int mi_lttng_event_function_probe(struct mi_writer *writer,
                struct lttng_event *event)
{
        int ret;

        ret = mi_lttng_writer_open_element(writer, config_element_attributes);
        if (ret) {
                goto end;
        }

        ret = mi_lttng_writer_open_element(writer, config_element_probe_attributes);
        if (ret) {
                goto end;
        }

        if (event->attr.probe.addr != 0) {
                /* event probe address */
                ret = mi_lttng_writer_write_element_unsigned_int(writer,
                                config_element_address, event->attr.probe.addr);
                if (ret) {
                        goto end;
                }
        } else {
                /* event probe offset */
                ret = mi_lttng_writer_write_element_unsigned_int(writer,
                                config_element_offset, event->attr.probe.offset);
                if (ret) {
                        goto end;
                }

                /* event probe symbol_name */
                ret = mi_lttng_writer_write_element_string(writer,
                                config_element_symbol_name, event->attr.probe.symbol_name);
                if (ret) {
                        goto end;
                }
        }

        /* Close probe_attributes and attributes */
        ret = mi_lttng_close_multi_element(writer, 2);
end:
        return ret;
}

static
int mi_lttng_event_userspace_probe(struct mi_writer *writer,
                struct lttng_event *event)
{
        int ret;
        const struct lttng_userspace_probe_location *location;
        const struct lttng_userspace_probe_location_lookup_method *lookup_method;
        enum lttng_userspace_probe_location_lookup_method_type lookup_type;

        location = lttng_event_get_userspace_probe_location(event);
        if (!location) {
                ret = -LTTNG_ERR_INVALID;
                goto end;
        }

        lookup_method = lttng_userspace_probe_location_get_lookup_method(location);
        if (!lookup_method) {
                ret = -LTTNG_ERR_INVALID;
                goto end;
        }

        lookup_type = lttng_userspace_probe_location_lookup_method_get_type(lookup_method);

        ret = mi_lttng_writer_open_element(writer, config_element_attributes);
        if (ret) {
                goto end;
        }

        switch (lttng_userspace_probe_location_get_type(location)) {
        case LTTNG_USERSPACE_PROBE_LOCATION_TYPE_FUNCTION:
        {
                const char *function_name;
                const char *binary_path;

                ret = mi_lttng_writer_open_element(writer,
                                config_element_userspace_probe_function_attributes);
                if (ret) {
                        goto end;
                }

                switch (lookup_type) {
                case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF:
                        ret = mi_lttng_writer_write_element_string(writer,
                                        config_element_userspace_probe_lookup,
                                        config_element_userspace_probe_lookup_function_elf);
                        if (ret) {
                                goto end;
                        }
                        break;
                case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_DEFAULT:
                        ret = mi_lttng_writer_write_element_string(writer,
                                        config_element_userspace_probe_lookup,
                                        config_element_userspace_probe_lookup_function_default);
                        if (ret) {
                                goto end;
                        }
                        break;
                default:
                        goto end;
                }

                binary_path = lttng_userspace_probe_location_function_get_binary_path(location);
                ret = mi_lttng_writer_write_element_string(writer,
                                config_element_userspace_probe_location_binary_path, binary_path);
                if (ret) {
                        goto end;
                }

                function_name = lttng_userspace_probe_location_function_get_function_name(location);
                ret = mi_lttng_writer_write_element_string(writer,
                                config_element_userspace_probe_function_location_function_name,
                                function_name);
                if (ret) {
                        goto end;
                }

                break;
        }
        case LTTNG_USERSPACE_PROBE_LOCATION_TYPE_TRACEPOINT:
        {
                const char *probe_name, *provider_name;
                const char *binary_path;

                ret = mi_lttng_writer_open_element(writer,
                                config_element_userspace_probe_function_attributes);
                if (ret) {
                        goto end;
                }

                switch (lookup_type) {
                case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_TRACEPOINT_SDT:
                        ret = mi_lttng_writer_write_element_string(writer,
                                        config_element_userspace_probe_lookup,
                                        config_element_userspace_probe_lookup_tracepoint_sdt);
                        if (ret) {
                                goto end;
                        }
                        break;
                default:
                        goto end;
                }

                binary_path = lttng_userspace_probe_location_tracepoint_get_binary_path(location);
                ret = mi_lttng_writer_write_element_string(writer,
                                config_element_userspace_probe_location_binary_path,
                                binary_path);
                if (ret) {
                        goto end;
                }

                provider_name = lttng_userspace_probe_location_tracepoint_get_provider_name(location);
                ret = mi_lttng_writer_write_element_string(writer,
                                config_element_userspace_probe_tracepoint_location_provider_name,
                                provider_name);
                if (ret) {
                        goto end;
                }

                probe_name = lttng_userspace_probe_location_tracepoint_get_probe_name(location);
                ret = mi_lttng_writer_write_element_string(writer,
                                config_element_userspace_probe_tracepoint_location_probe_name, probe_name);
                if (ret) {
                        goto end;
                }
                break;
        }
        default:
                ERR("Invalid probe type encountered");
        }
        /* Close probe_attributes and attributes */
        ret = mi_lttng_close_multi_element(writer, 2);
end:
        return ret;
}

int mi_lttng_event_function_entry(struct mi_writer *writer,
                struct lttng_event *event)
{
        int ret;

        ret = mi_lttng_writer_open_element(writer, config_element_attributes);
        if (ret) {
                goto end;
        }

        ret = mi_lttng_writer_open_element(writer, config_element_probe_attributes);
        if (ret) {
                goto end;
        }

        /* event probe symbol_name */
        ret = mi_lttng_writer_write_element_string(writer,
                        config_element_symbol_name, event->attr.ftrace.symbol_name);
        if (ret) {
                goto end;
        }

        /* Close function_attributes and attributes */
        ret = mi_lttng_close_multi_element(writer, 2);
end:
        return ret;
}

int mi_lttng_events_open(struct mi_writer *writer)
{
        return mi_lttng_writer_open_element(writer, config_element_events);
}

int mi_lttng_event(struct mi_writer *writer,
                struct lttng_event *event, int is_open, enum lttng_domain_type domain)
{
        int ret;

        ret = mi_lttng_event_common_attributes(writer, event);
        if (ret) {
                goto end;
        }

        switch (event->type) {
        case LTTNG_EVENT_TRACEPOINT:
        {
                if (event->loglevel != -1) {
                        ret = mi_lttng_event_tracepoint_loglevel(writer, event, domain);
                } else {
                        ret = mi_lttng_event_tracepoint_no_loglevel(writer, event);
                }
                break;
        }
        case LTTNG_EVENT_FUNCTION:
                /* Fallthrough */
        case LTTNG_EVENT_PROBE:
                ret = mi_lttng_event_function_probe(writer, event);
                break;
        case LTTNG_EVENT_FUNCTION_ENTRY:
                ret = mi_lttng_event_function_entry(writer, event);
                break;
        case LTTNG_EVENT_USERSPACE_PROBE:
                ret = mi_lttng_event_userspace_probe(writer, event);
                break;
        case LTTNG_EVENT_ALL:
                /* Fallthrough */
        default:
                break;
        }

        if (ret) {
                goto end;
        }

        if (!is_open) {
                ret = mi_lttng_writer_close_element(writer);
        }

end:
        return ret;
}

int mi_lttng_trackers_open(struct mi_writer *writer)
{
        return mi_lttng_writer_open_element(
                        writer, config_element_process_attr_trackers);
}

static int get_tracker_elements(enum lttng_process_attr process_attr,
                const char **element_process_attr_tracker,
                const char **element_process_attr_value)
{
        int ret = 0;

        switch (process_attr) {
        case LTTNG_PROCESS_ATTR_PROCESS_ID:
                *element_process_attr_tracker =
                                config_element_process_attr_tracker_pid;
                *element_process_attr_value =
                                config_element_process_attr_pid_value;
                break;
        case LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID:
                *element_process_attr_tracker =
                                config_element_process_attr_tracker_vpid;
                *element_process_attr_value =
                                config_element_process_attr_vpid_value;
                break;
        case LTTNG_PROCESS_ATTR_USER_ID:
                *element_process_attr_tracker =
                                config_element_process_attr_tracker_uid;
                *element_process_attr_value =
                                config_element_process_attr_uid_value;
                break;
        case LTTNG_PROCESS_ATTR_VIRTUAL_USER_ID:
                *element_process_attr_tracker =
                                config_element_process_attr_tracker_vuid;
                *element_process_attr_value =
                                config_element_process_attr_vuid_value;
                break;
        case LTTNG_PROCESS_ATTR_GROUP_ID:
                *element_process_attr_tracker =
                                config_element_process_attr_tracker_gid;
                *element_process_attr_value =
                                config_element_process_attr_gid_value;
                break;
        case LTTNG_PROCESS_ATTR_VIRTUAL_GROUP_ID:
                *element_process_attr_tracker =
                                config_element_process_attr_tracker_vgid;
                *element_process_attr_value =
                                config_element_process_attr_vgid_value;
                break;
        default:
                ret = LTTNG_ERR_SAVE_IO_FAIL;
        }
        return ret;
}

int mi_lttng_process_attribute_tracker_open(
                struct mi_writer *writer, enum lttng_process_attr process_attr)
{
        int ret;
        const char *element_tracker, *element_value;

        ret = get_tracker_elements(
                        process_attr, &element_tracker, &element_value);
        if (ret) {
                return ret;
        }

        /* Open process attribute tracker element */
        ret = mi_lttng_writer_open_element(writer, element_tracker);
        if (ret) {
                goto end;
        }

        /* Open values element */
        ret = mi_lttng_process_attr_values_open(writer);
end:
        return ret;
}

int mi_lttng_pids_open(struct mi_writer *writer)
{
        return mi_lttng_writer_open_element(writer, config_element_pids);
}

/*
 * TODO: move the listing of pid for user agent to process semantic on
 * mi api bump. The use of process element break the mi api.
 */
int mi_lttng_pid(struct mi_writer *writer,
                pid_t pid,
                const char *name,
                int is_open)
{
        int ret;

        /* Open pid process */
        ret = mi_lttng_writer_open_element(writer, config_element_pid);
        if (ret) {
                goto end;
        }

        /* Writing pid number */
        ret = mi_lttng_writer_write_element_signed_int(writer,
                        mi_lttng_element_pid_id, (int)pid);
        if (ret) {
                goto end;
        }

        /* Writing name of the process */
        if (name) {
                ret = mi_lttng_writer_write_element_string(writer, config_element_name,
                                name);
                if (ret) {
                        goto end;
                }
        }

        if (!is_open) {
                /* Closing Pid */
                ret = mi_lttng_writer_close_element(writer);
        }

end:
        return ret;
}

int mi_lttng_process_attr_values_open(struct mi_writer *writer)
{
        return mi_lttng_writer_open_element(
                        writer, config_element_process_attr_values);
}

int mi_lttng_all_process_attribute_value(struct mi_writer *writer,
                enum lttng_process_attr process_attr,
                bool is_open)
{
        int ret;
        const char *element_id_tracker, *element_target_id;

        ret = get_tracker_elements(
                        process_attr, &element_id_tracker, &element_target_id);
        if (ret) {
                return ret;
        }

        ret = mi_lttng_writer_open_element(writer, element_target_id);
        if (ret) {
                goto end;
        }

        ret = mi_lttng_writer_open_element(writer, config_element_type);
        if (ret) {
                goto end;
        }

        ret = mi_lttng_writer_write_element_bool(writer, config_element_all, 1);
        if (ret) {
                goto end;
        }

        ret = mi_lttng_writer_close_element(writer);
        if (ret) {
                goto end;
        }

        if (!is_open) {
                ret = mi_lttng_writer_close_element(writer);
                if (ret) {
                        goto end;
                }
        }
end:
        return ret;
}

int mi_lttng_integral_process_attribute_value(struct mi_writer *writer,
                enum lttng_process_attr process_attr,
                int64_t value,
                bool is_open)
{
        int ret;
        const char *element_id_tracker, *element_target_id;

        ret = get_tracker_elements(
                        process_attr, &element_id_tracker, &element_target_id);
        if (ret) {
                return ret;
        }

        ret = mi_lttng_writer_open_element(writer, element_target_id);
        if (ret) {
                goto end;
        }

        ret = mi_lttng_writer_open_element(writer, config_element_type);
        if (ret) {
                goto end;
        }

        ret = mi_lttng_writer_write_element_signed_int(
                        writer, config_element_process_attr_id, value);
        if (ret) {
                goto end;
        }

        ret = mi_lttng_writer_close_element(writer);
        if (ret) {
                goto end;
        }

        if (!is_open) {
                ret = mi_lttng_writer_close_element(writer);
                if (ret) {
                        goto end;
                }
        }

end:
        return ret;
}

int mi_lttng_string_process_attribute_value(struct mi_writer *writer,
                enum lttng_process_attr process_attr,
                const char *value,
                bool is_open)

{
        int ret;
        const char *element_id_tracker, *element_target_id;

        ret = get_tracker_elements(
                        process_attr, &element_id_tracker, &element_target_id);
        if (ret) {
                return ret;
        }

        ret = mi_lttng_writer_open_element(writer, element_target_id);
        if (ret) {
                goto end;
        }

        ret = mi_lttng_writer_open_element(writer, config_element_type);
        if (ret) {
                goto end;
        }

        ret = mi_lttng_writer_write_element_string(
                        writer, config_element_name, value);
        if (ret) {
                goto end;
        }

        ret = mi_lttng_writer_close_element(writer);
        if (ret) {
                goto end;
        }

        if (!is_open) {
                ret = mi_lttng_writer_close_element(writer);
                if (ret) {
                        goto end;
                }
        }

end:
        return ret;
}

int mi_lttng_event_fields_open(struct mi_writer *writer)
{
        return mi_lttng_writer_open_element(writer, mi_lttng_element_event_fields);
}

int mi_lttng_event_field(struct mi_writer *writer,
                struct lttng_event_field *field)
{
        int ret;

        if (!field->field_name[0]) {
                ret = 0;
                goto end;
        }

        /* Open field */
        ret = mi_lttng_writer_open_element(writer, mi_lttng_element_event_field);
        if (ret) {
                goto end;
        }

        if (!field->field_name[0]) {
                goto close;
        }

        /* Name */
        ret = mi_lttng_writer_write_element_string(writer, config_element_name,
                        field->field_name);
        if (ret) {
                goto end;
        }

        /* Type */
        ret = mi_lttng_writer_write_element_string(writer, config_element_type,
                        mi_lttng_eventfieldtype_string(field->type));
        if (ret) {
                goto end;
        }

        /* nowrite  */
        ret = mi_lttng_writer_write_element_signed_int(writer,
                        mi_lttng_element_nowrite, field->nowrite);
        if (ret) {
                goto end;
        }

close:
        /* Close field element */
        ret = mi_lttng_writer_close_element(writer);

end:
        return ret;
}

int mi_lttng_perf_counter_context(struct mi_writer *writer,
                struct lttng_event_perf_counter_ctx  *perf_context)
{
        int ret;

        /* Open perf_counter_context */
        ret = mi_lttng_writer_open_element(writer,
                        mi_lttng_element_perf_counter_context);
        if (ret) {
                goto end;
        }

        /* Type */
        ret = mi_lttng_writer_write_element_unsigned_int(writer,
                        config_element_type, perf_context->type);
        if (ret) {
                goto end;
        }

        /* Config */
        ret = mi_lttng_writer_write_element_unsigned_int(writer,
                        config_element_config, perf_context->config);
        if (ret) {
                goto end;
        }

        /* Name of the perf counter */
        ret = mi_lttng_writer_write_element_string(writer,
                        config_element_name, perf_context->name);
        if (ret) {
                goto end;
        }

        /* Close perf_counter_context */
        ret = mi_lttng_writer_close_element(writer);
end:
        return ret;
}

static
int mi_lttng_app_context(struct mi_writer *writer,
                const char *provider_name, const char *ctx_name)
{
        int ret;

        /* Open app */
        ret = mi_lttng_writer_open_element(writer,
                        config_element_context_app);
        if (ret) {
                goto end;
        }

        /* provider_name */
        ret = mi_lttng_writer_write_element_string(writer,
                        config_element_context_app_provider_name,
                        provider_name);
        if (ret) {
                goto end;
        }

        /* ctx_name */
        ret = mi_lttng_writer_write_element_string(writer,
                        config_element_context_app_ctx_name, ctx_name);
        if (ret) {
                goto end;
        }

        /* Close app */
        ret = mi_lttng_writer_close_element(writer);
end:
        return ret;
}

int mi_lttng_context(struct mi_writer *writer,
                struct lttng_event_context *context, int is_open)
{
        int ret;

        /* Open context */
        ret = mi_lttng_writer_open_element(writer , config_element_context);
        if (ret) {
                goto end;
        }

        /* Special case for PERF_*_COUNTER
         * print the lttng_event_perf_counter_ctx*/
        switch (context->ctx) {
        case LTTNG_EVENT_CONTEXT_PERF_COUNTER:
        case LTTNG_EVENT_CONTEXT_PERF_THREAD_COUNTER:
        case LTTNG_EVENT_CONTEXT_PERF_CPU_COUNTER:
        {
                struct lttng_event_perf_counter_ctx *perf_context =
                                &context->u.perf_counter;
                ret =  mi_lttng_perf_counter_context(writer, perf_context);
                if (ret) {
                        goto end;
                }
                break;
        }
        case LTTNG_EVENT_CONTEXT_APP_CONTEXT:
        {
                ret = mi_lttng_app_context(writer,
                                context->u.app_ctx.provider_name,
                                context->u.app_ctx.ctx_name);
                if (ret) {
                        goto end;
                }
                break;
        }
        default:
        {
                const char *type_string = mi_lttng_event_contexttype_string(
                                context->ctx);
                if (!type_string) {
                        ret = -LTTNG_ERR_INVALID;
                        goto end;
                }

                /* Print context type */
                ret = mi_lttng_writer_write_element_string(writer,
                                config_element_type, type_string);
                break;
        }
        }

        /* Close context */
        if (!is_open) {
                ret = mi_lttng_writer_close_element(writer);
        }

end:
        return ret;
}

int mi_lttng_snapshot_output_session_name(struct mi_writer *writer,
                const char *session_name)
{
        int ret;

        /* Open session element */
        ret = mi_lttng_writer_open_element(writer, config_element_session);
        if (ret) {
                goto end;
        }

        /* Snapshot output list for current session name */
        ret = mi_lttng_writer_write_element_string(writer, config_element_name,
                        session_name);
        if (ret) {
                goto end;
        }

        /* Open element snapshots (sequence one snapshot) */
        ret = mi_lttng_writer_open_element(writer, mi_lttng_element_snapshots);
        if (ret) {
                goto end;
        }

end:
        return ret;
}

int mi_lttng_snapshot_list_output(struct mi_writer *writer,
                const struct lttng_snapshot_output *output)
{
        int ret;

        /* Open element snapshot output */
        ret = mi_lttng_writer_open_element(writer,
                        mi_lttng_element_command_snapshot);
        if (ret) {
                goto end;
        }

        /* ID of the snapshot output */
        ret = mi_lttng_writer_write_element_unsigned_int(writer,
                        mi_lttng_element_id, output->id);
        if (ret) {
                goto end;
        }

        /* Name of the output */
        ret = mi_lttng_writer_write_element_string(writer, config_element_name,
                        output->name);
        if (ret) {
                goto end;
        }

        /* Destination of the output (ctrl_url)*/
        ret = mi_lttng_writer_write_element_string(writer,
                        mi_lttng_element_snapshot_ctrl_url, output->ctrl_url);
        if (ret) {
                goto end;
        }

        /* Destination of the output (data_url) */
        ret = mi_lttng_writer_write_element_string(writer,
                        mi_lttng_element_snapshot_data_url, output->data_url);
        if (ret) {
                goto end;
        }

        /* total size of all stream combined */
        ret = mi_lttng_writer_write_element_unsigned_int(writer,
                        mi_lttng_element_snapshot_max_size, output->max_size);
        if (ret) {
                goto end;
        }

        /* Close snapshot output element */
        ret = mi_lttng_writer_close_element(writer);

end:
        return ret;
}

int mi_lttng_snapshot_del_output(struct mi_writer *writer, int id,
                const char *name, const char *current_session_name)
{
        int ret;

        /* Open element del_snapshot */
        ret = mi_lttng_writer_open_element(writer,
                        mi_lttng_element_command_snapshot);
        if (ret) {
                goto end;
        }


        if (id != UINT32_MAX) {
                /* "Snapshot output "id" successfully deleted
                 * for "current_session_name"
                 * ID of the snapshot output
                 */
                ret = mi_lttng_writer_write_element_unsigned_int(writer,
                                mi_lttng_element_id, id);
                if (ret) {
                        goto end;
                }
        } else {
                /* "Snapshot output "name" successfully deleted
                 * for session "current_session_name"
                 * Name of the output
                 */
                ret = mi_lttng_writer_write_element_string(writer, config_element_name,
                                name);
                if (ret) {
                        goto end;
                }
        }

        /* Snapshot was deleted for session "current_session_name"*/
        ret = mi_lttng_writer_write_element_string(writer,
                        mi_lttng_element_snapshot_session_name,
                        current_session_name);
        if (ret) {
                goto end;
        }

        /* Close snapshot element */
        ret = mi_lttng_writer_close_element(writer);

end:
        return ret;
}

int mi_lttng_snapshot_add_output(struct mi_writer *writer,
                const char *current_session_name, const char *n_ptr,
                struct lttng_snapshot_output *output)
{
        int ret;

        /* Open element snapshot */
        ret = mi_lttng_writer_open_element(writer,
                        mi_lttng_element_command_snapshot);
        if (ret) {
                goto end;
        }

        /* Snapshot output id */
        ret = mi_lttng_writer_write_element_unsigned_int(writer,
                        mi_lttng_element_id, output->id);
        if (ret) {
                goto end;
        }

        /* Snapshot output names */
        ret = mi_lttng_writer_write_element_string(writer,
                        config_element_name, n_ptr);
        if (ret) {
                goto end;
        }

        /* Destination of the output (ctrl_url)*/
        ret = mi_lttng_writer_write_element_string(writer,
                        mi_lttng_element_snapshot_ctrl_url, output->ctrl_url);
        if (ret) {
                goto end;
        }

        /* Snapshot added for session "current_session_name"*/
        ret = mi_lttng_writer_write_element_string(writer,
                        mi_lttng_element_snapshot_session_name, current_session_name);
        if (ret) {
                goto end;
        }

        /* total size of all stream combined */
        ret = mi_lttng_writer_write_element_unsigned_int(writer,
                        mi_lttng_element_snapshot_max_size, output->max_size);
        if (ret) {
                goto end;
        }

        /* Close snapshot element */
        ret = mi_lttng_writer_close_element(writer);

end:
        return ret;
}

int mi_lttng_snapshot_record(struct mi_writer *writer, const char *url,
                const char *cmdline_ctrl_url, const char *cmdline_data_url)
{
        int ret;

        /* Open element snapshot */
        ret = mi_lttng_writer_open_element(writer,
                        mi_lttng_element_command_snapshot);
        if (ret) {
                goto end;
        }

        /*
         * If a valid an URL was given, serialize it,
         * else take the command line data and ctrl urls*/
        if (url) {
                /* Destination of the output (ctrl_url)*/
                ret = mi_lttng_writer_write_element_string(writer,
                                mi_lttng_element_snapshot_ctrl_url, url);
                if (ret) {
                        goto end;
                }
        } else if (cmdline_ctrl_url) {
                /* Destination of the output (ctrl_url)*/
                ret = mi_lttng_writer_write_element_string(writer,
                                mi_lttng_element_snapshot_ctrl_url, cmdline_ctrl_url);
                if (ret) {
                        goto end;
                }

                /* Destination of the output (data_url) */
                ret = mi_lttng_writer_write_element_string(writer,
                                mi_lttng_element_snapshot_data_url, cmdline_data_url);
                if (ret) {
                        goto end;
                }
        }

        /* Close record_snapshot element */
        ret = mi_lttng_writer_close_element(writer);

end:
        return ret;
}

int mi_lttng_rotation_schedule(struct mi_writer *writer,
                const struct lttng_rotation_schedule *schedule)
{
        int ret = 0;
        enum lttng_rotation_status status;
        uint64_t value;
        const char *element_name;
        const char *value_name;
        bool empty_schedule = false;

        switch (lttng_rotation_schedule_get_type(schedule)) {
        case LTTNG_ROTATION_SCHEDULE_TYPE_PERIODIC:
                status = lttng_rotation_schedule_periodic_get_period(schedule,
                                &value);
                element_name = mi_lttng_element_rotation_schedule_periodic;
                value_name = mi_lttng_element_rotation_schedule_periodic_time_us;
                break;
        case LTTNG_ROTATION_SCHEDULE_TYPE_SIZE_THRESHOLD:
                status = lttng_rotation_schedule_size_threshold_get_threshold(
                                schedule, &value);
                element_name = mi_lttng_element_rotation_schedule_size_threshold;
                value_name = mi_lttng_element_rotation_schedule_size_threshold_bytes;
                break;
        default:
                ret = -1;
                goto end;
        }

        if (status != LTTNG_ROTATION_STATUS_OK) {
                if (status == LTTNG_ROTATION_STATUS_UNAVAILABLE) {
                        empty_schedule = true;
                } else {
                        ret = -1;
                        goto end;
                }
        }

        ret = mi_lttng_writer_open_element(writer, element_name);
        if (ret) {
                goto end;
        }

        if (!empty_schedule) {
                ret = mi_lttng_writer_write_element_unsigned_int(writer,
                                value_name, value);
                if (ret) {
                        goto end;
                }
        }

        /* Close schedule descriptor element. */
        ret = mi_lttng_writer_close_element(writer);
        if (ret) {
                goto end;
        }
end:
        return ret;
}

int mi_lttng_rotation_schedule_result(struct mi_writer *writer,
                const struct lttng_rotation_schedule *schedule,
                bool success)
{
        int ret = 0;

        ret = mi_lttng_writer_open_element(writer,
                        mi_lttng_element_rotation_schedule_result);
        if (ret) {
                goto end;
        }

        ret = mi_lttng_writer_open_element(writer,
                        mi_lttng_element_rotation_schedule);
        if (ret) {
                goto end;
        }

        ret = mi_lttng_rotation_schedule(writer, schedule);
        if (ret) {
                goto end;
        }

        /* Close rotation_schedule element */
        ret = mi_lttng_writer_close_element(writer);
        if (ret) {
                goto end;
        }

        ret = mi_lttng_writer_write_element_bool(writer,
                        mi_lttng_element_command_success, success);
        if (ret) {
                goto end;
        }

        /* Close rotation_schedule_result element */
        ret = mi_lttng_writer_close_element(writer);
        if (ret) {
                goto end;
        }
end:
        return ret;
}

static
int mi_lttng_location(struct mi_writer *writer,
                const struct lttng_trace_archive_location *location)
{
        int ret = 0;
        enum lttng_trace_archive_location_type location_type;
        enum lttng_trace_archive_location_status status;

        location_type = lttng_trace_archive_location_get_type(location);

        switch (location_type) {
        case LTTNG_TRACE_ARCHIVE_LOCATION_TYPE_LOCAL:
        {
                const char *absolute_path;

                status = lttng_trace_archive_location_local_get_absolute_path(
                                location, &absolute_path);
                if (status != LTTNG_TRACE_ARCHIVE_LOCATION_STATUS_OK) {
                        ret = -1;
                        goto end;
                }

                ret = mi_lttng_writer_open_element(writer,
                                mi_lttng_element_rotation_location_local);
                if (ret) {
                        goto end;
                }


                ret = mi_lttng_writer_write_element_string(writer,
                                mi_lttng_element_rotation_location_local_absolute_path,
                                absolute_path);
                if (ret) {
                        goto end;
                }

                /* Close local element */
                ret = mi_lttng_writer_close_element(writer);
                if (ret) {
                        goto end;
                }
                break;
        }
        case LTTNG_TRACE_ARCHIVE_LOCATION_TYPE_RELAY:
        {
                uint16_t control_port, data_port;
                const char *host, *relative_path;
                enum lttng_trace_archive_location_relay_protocol_type protocol;

                /* Fetch all relay location parameters. */
                status = lttng_trace_archive_location_relay_get_protocol_type(
                                location, &protocol);
                if (status != LTTNG_TRACE_ARCHIVE_LOCATION_STATUS_OK) {
                        ret = -1;
                        goto end;
                }

                status = lttng_trace_archive_location_relay_get_host(
                                location, &host);
                if (status != LTTNG_TRACE_ARCHIVE_LOCATION_STATUS_OK) {
                        ret = -1;
                        goto end;
                }

                status = lttng_trace_archive_location_relay_get_control_port(
                                location, &control_port);
                if (status != LTTNG_TRACE_ARCHIVE_LOCATION_STATUS_OK) {
                        ret = -1;
                        goto end;
                }

                status = lttng_trace_archive_location_relay_get_data_port(
                                location, &data_port);
                if (status != LTTNG_TRACE_ARCHIVE_LOCATION_STATUS_OK) {
                        ret = -1;
                        goto end;
                }

                status = lttng_trace_archive_location_relay_get_relative_path(
                                location, &relative_path);
                if (status != LTTNG_TRACE_ARCHIVE_LOCATION_STATUS_OK) {
                        ret = -1;
                        goto end;
                }

                ret = mi_lttng_writer_open_element(writer,
                                mi_lttng_element_rotation_location_relay);
                if (ret) {
                        goto end;
                }

                ret = mi_lttng_writer_write_element_string(writer,
                                mi_lttng_element_rotation_location_relay_host,
                                host);
                if (ret) {
                        goto end;
                }

                ret = mi_lttng_writer_write_element_unsigned_int(writer,
                                mi_lttng_element_rotation_location_relay_control_port,
                                control_port);
                if (ret) {
                        goto end;
                }

                ret = mi_lttng_writer_write_element_unsigned_int(writer,
                                mi_lttng_element_rotation_location_relay_data_port,
                                data_port);
                if (ret) {
                        goto end;
                }

                ret = mi_lttng_writer_write_element_string(writer,
                                mi_lttng_element_rotation_location_relay_protocol,
                                mi_lttng_trace_archive_location_relay_protocol_type_string(protocol));
                if (ret) {
                        goto end;
                }

                ret = mi_lttng_writer_write_element_string(writer,
                                mi_lttng_element_rotation_location_relay_relative_path,
                                relative_path);
                if (ret) {
                        goto end;
                }

                /* Close relay element */
                ret = mi_lttng_writer_close_element(writer);
                if (ret) {
                        goto end;
                }
                break;
        }
        default:
                abort();
        }
end:
        return ret;
}

int mi_lttng_rotate(struct mi_writer *writer,
                const char *session_name,
                enum lttng_rotation_state rotation_state,
                const struct lttng_trace_archive_location *location)
{
        int ret;

        ret = mi_lttng_writer_open_element(writer,
                        mi_lttng_element_rotation);
        if (ret) {
                goto end;
        }

        ret = mi_lttng_writer_write_element_string(writer,
                        mi_lttng_element_session_name,
                        session_name);
        if (ret) {
                goto end;
        }

        ret = mi_lttng_writer_write_element_string(writer,
                        mi_lttng_element_rotation_state,
                        mi_lttng_rotation_state_string(rotation_state));
        if (ret) {
                goto end;
        }

        if (!location) {
                /* Not a serialization error. */
                goto close_rotation;
        }

        ret = mi_lttng_writer_open_element(writer,
                        mi_lttng_element_rotation_location);
        if (ret) {
                goto end;
        }

        ret = mi_lttng_location(writer, location);
        if (ret) {
                goto close_location;
        }

close_location:
        /* Close location element */
        ret = mi_lttng_writer_close_element(writer);
        if (ret) {
                goto end;
        }

close_rotation:
        /* Close rotation element */
        ret = mi_lttng_writer_close_element(writer);
        if (ret) {
                goto end;
        }
end:
        return ret;
}