+ /*
+ * We have a filter, so we need to set up a variable-length
+ * memory block from where to send the data.
+ */
+
+ /* Parse filter expression */
+ if (filter_expression != NULL || handle->domain.type == LTTNG_DOMAIN_JUL
+ || handle->domain.type == LTTNG_DOMAIN_LOG4J
+ || handle->domain.type == LTTNG_DOMAIN_PYTHON) {
+ if (handle->domain.type == LTTNG_DOMAIN_JUL ||
+ handle->domain.type == LTTNG_DOMAIN_LOG4J ||
+ handle->domain.type == LTTNG_DOMAIN_PYTHON) {
+ char *agent_filter;
+
+ /* Setup JUL filter if needed. */
+ agent_filter = set_agent_filter(filter_expression, ev);
+ if (!agent_filter) {
+ if (!filter_expression) {
+ /*
+ * No JUL and no filter, just skip
+ * everything below.
+ */
+ goto ask_sessiond;
+ }
+ } else {
+ /*
+ * With a JUL filter, the original filter has
+ * been added to it thus replace the filter
+ * expression.
+ */
+ filter_expression = agent_filter;
+ free_filter_expression = 1;
+ }
+ }
+
+ ret = generate_filter(filter_expression, &lsm, &ctx);
+ if (ret) {
+ goto filter_error;
+ }
+ }
+
+ varlen_data = zmalloc(lsm.u.disable.bytecode_len
+ + lsm.u.disable.expression_len);
+ if (!varlen_data) {
+ ret = -LTTNG_ERR_EXCLUSION_NOMEM;
+ goto mem_error;
+ }
+
+ /* Add filter expression. */
+ if (lsm.u.disable.expression_len != 0) {
+ memcpy(varlen_data,
+ filter_expression,
+ lsm.u.disable.expression_len);
+ }
+ /* Add filter bytecode next. */
+ if (ctx && lsm.u.disable.bytecode_len != 0) {
+ memcpy(varlen_data
+ + lsm.u.disable.expression_len,
+ &ctx->bytecode->b,
+ lsm.u.disable.bytecode_len);
+ }
+
+ ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, varlen_data,
+ lsm.u.disable.bytecode_len + lsm.u.disable.expression_len, NULL);
+ free(varlen_data);
+
+mem_error:
+ if (filter_expression && ctx) {
+ filter_bytecode_free(ctx);
+ filter_ir_free(ctx);
+ filter_parser_ctx_free(ctx);
+ }
+filter_error:
+ if (free_filter_expression) {
+ /*
+ * The filter expression has been replaced and must be freed as
+ * it is not the original filter expression received as a
+ * parameter.
+ */
+ free(filter_expression);
+ }
+error:
+ /*
+ * Return directly to the caller and don't ask the sessiond since
+ * something went wrong in the parsing of data above.
+ */
+ return ret;
+
+ask_sessiond:
+ ret = lttng_ctl_ask_sessiond(&lsm, NULL);
+ return ret;
+}
+
+/*
+ * Disable event(s) of a channel and domain.
+ * If no event name is specified, all events are disabled.
+ * If no channel name is specified, the default 'channel0' is used.
+ * Returns size of returned session payload data or a negative error code.
+ */
+int lttng_disable_event(struct lttng_handle *handle, const char *name,
+ const char *channel_name)
+{
+ int ret;
+ struct lttng_event ev;
+
+ memset(&ev, 0, sizeof(ev));
+ ev.loglevel = -1;
+ ev.type = LTTNG_EVENT_ALL;
+ ret = lttng_strncpy(ev.name, name ?: "", sizeof(ev.name));
+ if (ret) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ ret = lttng_disable_event_ext(handle, &ev, channel_name, NULL);
+end:
+ return ret;
+}
+
+struct lttng_channel *lttng_channel_create(struct lttng_domain *domain)
+{
+ struct lttng_channel *channel = NULL;
+
+ if (!domain) {
+ goto end;
+ }
+
+ /* Validate domain. */
+ switch (domain->type) {
+ case LTTNG_DOMAIN_UST:
+ switch (domain->buf_type) {
+ case LTTNG_BUFFER_PER_UID:
+ case LTTNG_BUFFER_PER_PID:
+ break;
+ default:
+ goto end;
+ }
+ break;
+ case LTTNG_DOMAIN_KERNEL:
+ if (domain->buf_type != LTTNG_BUFFER_GLOBAL) {
+ goto end;
+ }
+ break;
+ default:
+ goto end;
+ }
+
+ channel = lttng_channel_create_internal();
+ if (!channel) {
+ goto end;
+ }
+
+ lttng_channel_set_default_attr(domain, &channel->attr);
+end:
+ return channel;
+}
+
+void lttng_channel_destroy(struct lttng_channel *channel)
+{
+ if (!channel) {
+ return;
+ }
+
+ if (channel->attr.extended.ptr) {
+ free(channel->attr.extended.ptr);
+ }
+ free(channel);
+}
+
+/*
+ * Enable channel per domain
+ * Returns size of returned session payload data or a negative error code.
+ */
+int lttng_enable_channel(struct lttng_handle *handle,
+ struct lttng_channel *in_chan)
+{
+ enum lttng_error_code ret_code;
+ int ret;
+ struct lttng_dynamic_buffer buffer;
+ struct lttcomm_session_msg lsm;
+ uint64_t total_buffer_size_needed_per_cpu = 0;
+ struct lttng_channel *channel = NULL;
+
+ lttng_dynamic_buffer_init(&buffer);
+
+ /* NULL arguments are forbidden. No default values. */
+ if (handle == NULL || in_chan == NULL) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ /*
+ * Verify that the amount of memory required to create the requested
+ * buffer is available on the system at the moment.
+ */
+ if (in_chan->attr.num_subbuf >
+ UINT64_MAX / in_chan->attr.subbuf_size) {
+ /* Overflow */
+ ret = -LTTNG_ERR_OVERFLOW;
+ goto end;
+ }
+
+ total_buffer_size_needed_per_cpu =
+ in_chan->attr.num_subbuf * in_chan->attr.subbuf_size;
+ ret_code = check_enough_available_memory(
+ total_buffer_size_needed_per_cpu);
+ if (ret_code != LTTNG_OK) {
+ ret = -ret_code;
+ goto end;
+ }
+
+ /* Copy the channel for easier manipulation. */
+ channel = lttng_channel_copy(in_chan);
+ if (!channel) {
+ ret = -LTTNG_ERR_NOMEM;
+ goto end;
+ }
+
+ /* Populate the channel extended attribute if necessary. */
+ if (!channel->attr.extended.ptr) {
+ struct lttng_channel_extended *extended =
+ zmalloc(sizeof(*extended));
+
+ if (!extended) {
+ ret = -LTTNG_ERR_NOMEM;
+ goto end;
+ }
+ lttng_channel_set_default_extended_attr(
+ &handle->domain, extended);
+ channel->attr.extended.ptr = extended;
+ }
+
+ /* Prepare the payload */
+ memset(&lsm, 0, sizeof(lsm));
+
+ lsm.cmd_type = LTTNG_ENABLE_CHANNEL;
+ COPY_DOMAIN_PACKED(lsm.domain, handle->domain);
+
+ ret = lttng_strncpy(lsm.session.name, handle->session_name,
+ sizeof(lsm.session.name));
+ if (ret) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ ret = lttng_channel_serialize(channel, &buffer);
+ if (ret) {
+ ret = -LTTNG_ERR_FATAL;
+ goto end;
+ }
+
+ lsm.u.channel.length = buffer.size;
+
+ ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(
+ &lsm, buffer.data, buffer.size, NULL);
+end:
+ lttng_channel_destroy(channel);
+ lttng_dynamic_buffer_reset(&buffer);
+ return ret;
+}
+
+/*
+ * All tracing will be stopped for registered events of the channel.
+ * Returns size of returned session payload data or a negative error code.
+ */
+int lttng_disable_channel(struct lttng_handle *handle, const char *name)
+{
+ int ret;
+ struct lttcomm_session_msg lsm;
+
+ /* Safety check. Both are mandatory. */
+ if (handle == NULL || name == NULL) {
+ return -LTTNG_ERR_INVALID;
+ }
+
+ memset(&lsm, 0, sizeof(lsm));
+
+ lsm.cmd_type = LTTNG_DISABLE_CHANNEL;
+
+ ret = lttng_strncpy(lsm.u.disable.channel_name, name,
+ sizeof(lsm.u.disable.channel_name));
+ if (ret) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ COPY_DOMAIN_PACKED(lsm.domain, handle->domain);
+
+ ret = lttng_strncpy(lsm.session.name, handle->session_name,
+ sizeof(lsm.session.name));
+ if (ret) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ ret = lttng_ctl_ask_sessiond(&lsm, NULL);
+end:
+ return ret;
+}
+
+/*
+ * Lists all available tracepoints of domain.
+ * Sets the contents of the events array.
+ * Returns the number of lttng_event entries in events;
+ * on error, returns a negative value.
+ */
+int lttng_list_tracepoints(struct lttng_handle *handle,
+ struct lttng_event **events)
+{
+ int ret;
+ struct lttcomm_session_msg lsm;
+
+ if (handle == NULL) {
+ return -LTTNG_ERR_INVALID;
+ }
+
+ memset(&lsm, 0, sizeof(lsm));
+ lsm.cmd_type = LTTNG_LIST_TRACEPOINTS;
+ COPY_DOMAIN_PACKED(lsm.domain, handle->domain);
+
+ ret = lttng_ctl_ask_sessiond(&lsm, (void **) events);
+ if (ret < 0) {
+ return ret;
+ }
+
+ return ret / sizeof(struct lttng_event);
+}
+
+/*
+ * Lists all available tracepoint fields of domain.
+ * Sets the contents of the event field array.
+ * Returns the number of lttng_event_field entries in events;
+ * on error, returns a negative value.
+ */
+int lttng_list_tracepoint_fields(struct lttng_handle *handle,
+ struct lttng_event_field **fields)
+{
+ int ret;
+ struct lttcomm_session_msg lsm;
+
+ if (handle == NULL) {
+ return -LTTNG_ERR_INVALID;
+ }
+
+ memset(&lsm, 0, sizeof(lsm));
+ lsm.cmd_type = LTTNG_LIST_TRACEPOINT_FIELDS;
+ COPY_DOMAIN_PACKED(lsm.domain, handle->domain);
+
+ ret = lttng_ctl_ask_sessiond(&lsm, (void **) fields);
+ if (ret < 0) {
+ return ret;
+ }
+
+ return ret / sizeof(struct lttng_event_field);
+}
+
+/*
+ * Lists all available kernel system calls. Allocates and sets the contents of
+ * the events array.
+ *
+ * Returns the number of lttng_event entries in events; on error, returns a
+ * negative value.
+ */
+int lttng_list_syscalls(struct lttng_event **events)
+{
+ int ret;
+ struct lttcomm_session_msg lsm;
+
+ if (!events) {
+ return -LTTNG_ERR_INVALID;
+ }
+
+ memset(&lsm, 0, sizeof(lsm));
+ lsm.cmd_type = LTTNG_LIST_SYSCALLS;
+ /* Force kernel domain for system calls. */
+ lsm.domain.type = LTTNG_DOMAIN_KERNEL;
+
+ ret = lttng_ctl_ask_sessiond(&lsm, (void **) events);
+ if (ret < 0) {
+ return ret;
+ }
+
+ return ret / sizeof(struct lttng_event);
+}
+