-/*
- * Copyright (C) 2017 Jérémie Galarneau <jeremie.galarneau@efficios.com>
- *
- * SPDX-License-Identifier: LGPL-2.1-only
- *
- */
-
-#include <lttng/condition/condition-internal.h>
-#include <lttng/condition/buffer-usage-internal.h>
-#include <common/macros.h>
-#include <common/error.h>
-#include <assert.h>
-#include <math.h>
-#include <float.h>
-#include <time.h>
-
-#define IS_USAGE_CONDITION(condition) ( \
- lttng_condition_get_type(condition) == LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW || \
- lttng_condition_get_type(condition) == LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH \
- )
-
-static
-double fixed_to_double(uint32_t val)
-{
- return (double) val / (double) UINT32_MAX;
-}
-
-static
-uint64_t double_to_fixed(double val)
-{
- return (val * (double) UINT32_MAX);
-}
-
-static
-bool is_usage_evaluation(const struct lttng_evaluation *evaluation)
-{
- enum lttng_condition_type type = lttng_evaluation_get_type(evaluation);
-
- return type == LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW ||
- type == LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH;
-}
-
-static
-void lttng_condition_buffer_usage_destroy(struct lttng_condition *condition)
-{
- struct lttng_condition_buffer_usage *usage;
-
- usage = container_of(condition, struct lttng_condition_buffer_usage,
- parent);
-
- free(usage->session_name);
- free(usage->channel_name);
- free(usage);
-}
-
-static
-bool lttng_condition_buffer_usage_validate(
- const struct lttng_condition *condition)
-{
- bool valid = false;
- struct lttng_condition_buffer_usage *usage;
-
- if (!condition) {
- goto end;
- }
-
- usage = container_of(condition, struct lttng_condition_buffer_usage,
- parent);
- if (!usage->session_name) {
- ERR("Invalid buffer condition: a target session name must be set.");
- goto end;
- }
- if (!usage->channel_name) {
- ERR("Invalid buffer condition: a target channel name must be set.");
- goto end;
- }
- if (!usage->threshold_ratio.set && !usage->threshold_bytes.set) {
- ERR("Invalid buffer condition: a threshold must be set.");
- goto end;
- }
- if (!usage->domain.set) {
- ERR("Invalid buffer usage condition: a domain must be set.");
- goto end;
- }
-
- valid = true;
-end:
- return valid;
-}
-
-static
-int lttng_condition_buffer_usage_serialize(
- const struct lttng_condition *condition,
- struct lttng_payload *payload)
-{
- int ret;
- struct lttng_condition_buffer_usage *usage;
- size_t session_name_len, channel_name_len;
- struct lttng_condition_buffer_usage_comm usage_comm;
-
- if (!condition || !IS_USAGE_CONDITION(condition)) {
- ret = -1;
- goto end;
- }
-
- DBG("Serializing buffer usage condition");
- usage = container_of(condition, struct lttng_condition_buffer_usage,
- parent);
-
- session_name_len = strlen(usage->session_name) + 1;
- channel_name_len = strlen(usage->channel_name) + 1;
- if (session_name_len > LTTNG_NAME_MAX ||
- channel_name_len > LTTNG_NAME_MAX) {
- ret = -1;
- goto end;
- }
-
- usage_comm.threshold_set_in_bytes = !!usage->threshold_bytes.set;
- usage_comm.session_name_len = session_name_len;
- usage_comm.channel_name_len = channel_name_len;
- usage_comm.domain_type = (int8_t) usage->domain.type;
-
- if (usage->threshold_bytes.set) {
- usage_comm.threshold = usage->threshold_bytes.value;
- } else {
- uint64_t val = double_to_fixed(
- usage->threshold_ratio.value);
-
- if (val > UINT32_MAX) {
- /* overflow. */
- ret = -1;
- goto end;
- }
- usage_comm.threshold = val;
- }
-
- ret = lttng_dynamic_buffer_append(&payload->buffer, &usage_comm,
- sizeof(usage_comm));
- if (ret) {
- goto end;
- }
-
- ret = lttng_dynamic_buffer_append(&payload->buffer, usage->session_name,
- session_name_len);
- if (ret) {
- goto end;
- }
-
- ret = lttng_dynamic_buffer_append(&payload->buffer, usage->channel_name,
- channel_name_len);
- if (ret) {
- goto end;
- }
-end:
- return ret;
-}
-
-static
-bool lttng_condition_buffer_usage_is_equal(const struct lttng_condition *_a,
- const struct lttng_condition *_b)
-{
- bool is_equal = false;
- struct lttng_condition_buffer_usage *a, *b;
-
- a = container_of(_a, struct lttng_condition_buffer_usage, parent);
- b = container_of(_b, struct lttng_condition_buffer_usage, parent);
-
- if ((a->threshold_ratio.set && !b->threshold_ratio.set) ||
- (a->threshold_bytes.set && !b->threshold_bytes.set)) {
- goto end;
- }
-
- if (a->threshold_ratio.set && b->threshold_ratio.set) {
- double a_value, b_value, diff;
-
- a_value = a->threshold_ratio.value;
- b_value = b->threshold_ratio.value;
- diff = fabs(a_value - b_value);
-
- if (diff > DBL_EPSILON) {
- goto end;
- }
- } else if (a->threshold_bytes.set && b->threshold_bytes.set) {
- uint64_t a_value, b_value;
-
- a_value = a->threshold_bytes.value;
- b_value = b->threshold_bytes.value;
- if (a_value != b_value) {
- goto end;
- }
- }
-
- /* Condition is not valid if this is not true. */
- assert(a->session_name);
- assert(b->session_name);
- if (strcmp(a->session_name, b->session_name)) {
- goto end;
- }
-
- assert(a->channel_name);
- assert(b->channel_name);
- if (strcmp(a->channel_name, b->channel_name)) {
- goto end;
- }
-
- assert(a->domain.set);
- assert(b->domain.set);
- if (a->domain.type != b->domain.type) {
- goto end;
- }
- is_equal = true;
-end:
- return is_equal;
-}
-
-static
-struct lttng_condition *lttng_condition_buffer_usage_create(
- enum lttng_condition_type type)
-{
- struct lttng_condition_buffer_usage *condition;
-
- condition = zmalloc(sizeof(struct lttng_condition_buffer_usage));
- if (!condition) {
- return NULL;
- }
-
- lttng_condition_init(&condition->parent, type);
- condition->parent.validate = lttng_condition_buffer_usage_validate;
- condition->parent.serialize = lttng_condition_buffer_usage_serialize;
- condition->parent.equal = lttng_condition_buffer_usage_is_equal;
- condition->parent.destroy = lttng_condition_buffer_usage_destroy;
- return &condition->parent;
-}
-
-struct lttng_condition *lttng_condition_buffer_usage_low_create(void)
-{
- return lttng_condition_buffer_usage_create(
- LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW);
-}
-
-struct lttng_condition *lttng_condition_buffer_usage_high_create(void)
-{
- return lttng_condition_buffer_usage_create(
- LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH);
-}
-
-static
-ssize_t init_condition_from_payload(struct lttng_condition *condition,
- struct lttng_payload_view *src_view)
-{
- ssize_t ret, condition_size;
- enum lttng_condition_status status;
- enum lttng_domain_type domain_type;
- const char *session_name, *channel_name;
- struct lttng_buffer_view names_view;
- const struct lttng_condition_buffer_usage_comm *condition_comm;
- const struct lttng_payload_view condition_comm_view =
- lttng_payload_view_from_view(
- src_view, 0, sizeof(*condition_comm));
-
- if (!lttng_payload_view_is_valid(&condition_comm_view)) {
- ERR("Failed to initialize from malformed condition buffer: buffer too short to contain header");
- ret = -1;
- goto end;
- }
-
- condition_comm = (typeof(condition_comm)) condition_comm_view.buffer.data;
- names_view = lttng_buffer_view_from_view(&src_view->buffer,
- sizeof(*condition_comm), -1);
-
- if (condition_comm->session_name_len > LTTNG_NAME_MAX ||
- condition_comm->channel_name_len > LTTNG_NAME_MAX) {
- ERR("Failed to initialize from malformed condition buffer: name exceeds LTTNG_MAX_NAME");
- ret = -1;
- goto end;
- }
-
- if (names_view.size <
- (condition_comm->session_name_len +
- condition_comm->channel_name_len)) {
- ERR("Failed to initialize from malformed condition buffer: buffer too short to contain element names");
- ret = -1;
- goto end;
- }
-
- if (condition_comm->threshold_set_in_bytes) {
- status = lttng_condition_buffer_usage_set_threshold(condition,
- condition_comm->threshold);
- } else {
- status = lttng_condition_buffer_usage_set_threshold_ratio(
- condition,
- fixed_to_double(condition_comm->threshold));
- }
-
- if (status != LTTNG_CONDITION_STATUS_OK) {
- ERR("Failed to initialize buffer usage condition threshold");
- ret = -1;
- goto end;
- }
-
- if (condition_comm->domain_type <= LTTNG_DOMAIN_NONE ||
- condition_comm->domain_type > LTTNG_DOMAIN_PYTHON) {
- /* Invalid domain value. */
- ERR("Invalid domain type value (%i) found in condition buffer",
- (int) condition_comm->domain_type);
- ret = -1;
- goto end;
- }
-
- domain_type = (enum lttng_domain_type) condition_comm->domain_type;
- status = lttng_condition_buffer_usage_set_domain_type(condition,
- domain_type);
- if (status != LTTNG_CONDITION_STATUS_OK) {
- ERR("Failed to set buffer usage condition domain");
- ret = -1;
- goto end;
- }
-
- session_name = names_view.data;
- if (*(session_name + condition_comm->session_name_len - 1) != '\0') {
- ERR("Malformed session name encountered in condition buffer");
- ret = -1;
- goto end;
- }
-
- channel_name = session_name + condition_comm->session_name_len;
- if (*(channel_name + condition_comm->channel_name_len - 1) != '\0') {
- ERR("Malformed channel name encountered in condition buffer");
- ret = -1;
- goto end;
- }
-
- status = lttng_condition_buffer_usage_set_session_name(condition,
- session_name);
- if (status != LTTNG_CONDITION_STATUS_OK) {
- ERR("Failed to set buffer usage session name");
- ret = -1;
- goto end;
- }
-
- status = lttng_condition_buffer_usage_set_channel_name(condition,
- channel_name);
- if (status != LTTNG_CONDITION_STATUS_OK) {
- ERR("Failed to set buffer usage channel name");
- ret = -1;
- goto end;
- }
-
- if (!lttng_condition_validate(condition)) {
- ret = -1;
- goto end;
- }
-
- condition_size = sizeof(*condition_comm) +
- (ssize_t) condition_comm->session_name_len +
- (ssize_t) condition_comm->channel_name_len;
- ret = condition_size;
-end:
- return ret;
-}
-
-LTTNG_HIDDEN
-ssize_t lttng_condition_buffer_usage_low_create_from_payload(
- struct lttng_payload_view *view,
- struct lttng_condition **_condition)
-{
- ssize_t ret;
- struct lttng_condition *condition =
- lttng_condition_buffer_usage_low_create();
-
- if (!_condition || !condition) {
- ret = -1;
- goto error;
- }
-
- ret = init_condition_from_payload(condition, view);
- if (ret < 0) {
- goto error;
- }
-
- *_condition = condition;
- return ret;
-error:
- lttng_condition_destroy(condition);
- return ret;
-}
-
-LTTNG_HIDDEN
-ssize_t lttng_condition_buffer_usage_high_create_from_payload(
- struct lttng_payload_view *view,
- struct lttng_condition **_condition)
-{
- ssize_t ret;
- struct lttng_condition *condition =
- lttng_condition_buffer_usage_high_create();
-
- if (!_condition || !condition) {
- ret = -1;
- goto error;
- }
-
- ret = init_condition_from_payload(condition, view);
- if (ret < 0) {
- goto error;
- }
-
- *_condition = condition;
- return ret;
-error:
- lttng_condition_destroy(condition);
- return ret;
-}
-
-static
-struct lttng_evaluation *create_evaluation_from_payload(
- enum lttng_condition_type type,
- struct lttng_payload_view *view)
-{
- const struct lttng_evaluation_buffer_usage_comm *comm =
- (typeof(comm)) view->buffer.data;
- struct lttng_evaluation *evaluation = NULL;
-
- if (view->buffer.size < sizeof(*comm)) {
- goto end;
- }
-
- evaluation = lttng_evaluation_buffer_usage_create(type,
- comm->buffer_use, comm->buffer_capacity);
-end:
- return evaluation;
-}
-
-LTTNG_HIDDEN
-ssize_t lttng_evaluation_buffer_usage_low_create_from_payload(
- struct lttng_payload_view *view,
- struct lttng_evaluation **_evaluation)
-{
- ssize_t ret;
- struct lttng_evaluation *evaluation = NULL;
-
- if (!_evaluation) {
- ret = -1;
- goto error;
- }
-
- evaluation = create_evaluation_from_payload(
- LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW, view);
- if (!evaluation) {
- ret = -1;
- goto error;
- }
-
- *_evaluation = evaluation;
- ret = sizeof(struct lttng_evaluation_buffer_usage_comm);
- return ret;
-error:
- lttng_evaluation_destroy(evaluation);
- return ret;
-}
-
-LTTNG_HIDDEN
-ssize_t lttng_evaluation_buffer_usage_high_create_from_payload(
- struct lttng_payload_view *view,
- struct lttng_evaluation **_evaluation)
-{
- ssize_t ret;
- struct lttng_evaluation *evaluation = NULL;
-
- if (!_evaluation) {
- ret = -1;
- goto error;
- }
-
- evaluation = create_evaluation_from_payload(
- LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH, view);
- if (!evaluation) {
- ret = -1;
- goto error;
- }
-
- *_evaluation = evaluation;
- ret = sizeof(struct lttng_evaluation_buffer_usage_comm);
- return ret;
-error:
- lttng_evaluation_destroy(evaluation);
- return ret;
-}
-
-enum lttng_condition_status
-lttng_condition_buffer_usage_get_threshold_ratio(
- const struct lttng_condition *condition,
- double *threshold_ratio)
-{
- struct lttng_condition_buffer_usage *usage;
- enum lttng_condition_status status = LTTNG_CONDITION_STATUS_OK;
-
- if (!condition || !IS_USAGE_CONDITION(condition) ||
- !threshold_ratio) {
- status = LTTNG_CONDITION_STATUS_INVALID;
- goto end;
- }
-
- usage = container_of(condition, struct lttng_condition_buffer_usage,
- parent);
- if (!usage->threshold_ratio.set) {
- status = LTTNG_CONDITION_STATUS_UNSET;
- goto end;
- }
- *threshold_ratio = usage->threshold_ratio.value;
-end:
- return status;
-}
-
-/* threshold_ratio expressed as [0.0, 1.0]. */
-enum lttng_condition_status
-lttng_condition_buffer_usage_set_threshold_ratio(
- struct lttng_condition *condition, double threshold_ratio)
-{
- struct lttng_condition_buffer_usage *usage;
- enum lttng_condition_status status = LTTNG_CONDITION_STATUS_OK;
-
- if (!condition || !IS_USAGE_CONDITION(condition) ||
- threshold_ratio < 0.0 ||
- threshold_ratio > 1.0) {
- status = LTTNG_CONDITION_STATUS_INVALID;
- goto end;
- }
-
- usage = container_of(condition, struct lttng_condition_buffer_usage,
- parent);
- usage->threshold_ratio.set = true;
- usage->threshold_bytes.set = false;
- usage->threshold_ratio.value = threshold_ratio;
-end:
- return status;
-}
-
-enum lttng_condition_status
-lttng_condition_buffer_usage_get_threshold(
- const struct lttng_condition *condition,
- uint64_t *threshold_bytes)
-{
- struct lttng_condition_buffer_usage *usage;
- enum lttng_condition_status status = LTTNG_CONDITION_STATUS_OK;
-
- if (!condition || !IS_USAGE_CONDITION(condition) || !threshold_bytes) {
- status = LTTNG_CONDITION_STATUS_INVALID;
- goto end;
- }
-
- usage = container_of(condition, struct lttng_condition_buffer_usage,
- parent);
- if (!usage->threshold_bytes.set) {
- status = LTTNG_CONDITION_STATUS_UNSET;
- goto end;
- }
- *threshold_bytes = usage->threshold_bytes.value;
-end:
- return status;
-}
-
-enum lttng_condition_status
-lttng_condition_buffer_usage_set_threshold(
- struct lttng_condition *condition, uint64_t threshold_bytes)
-{
- struct lttng_condition_buffer_usage *usage;
- enum lttng_condition_status status = LTTNG_CONDITION_STATUS_OK;
-
- if (!condition || !IS_USAGE_CONDITION(condition)) {
- status = LTTNG_CONDITION_STATUS_INVALID;
- goto end;
- }
-
- usage = container_of(condition, struct lttng_condition_buffer_usage,
- parent);
- usage->threshold_ratio.set = false;
- usage->threshold_bytes.set = true;
- usage->threshold_bytes.value = threshold_bytes;
-end:
- return status;
-}
-
-enum lttng_condition_status
-lttng_condition_buffer_usage_get_session_name(
- const struct lttng_condition *condition,
- const char **session_name)
-{
- struct lttng_condition_buffer_usage *usage;
- enum lttng_condition_status status = LTTNG_CONDITION_STATUS_OK;
-
- if (!condition || !IS_USAGE_CONDITION(condition) || !session_name) {
- status = LTTNG_CONDITION_STATUS_INVALID;
- goto end;
- }
-
- usage = container_of(condition, struct lttng_condition_buffer_usage,
- parent);
- if (!usage->session_name) {
- status = LTTNG_CONDITION_STATUS_UNSET;
- goto end;
- }
- *session_name = usage->session_name;
-end:
- return status;
-}
-
-enum lttng_condition_status
-lttng_condition_buffer_usage_set_session_name(
- struct lttng_condition *condition, const char *session_name)
-{
- char *session_name_copy;
- struct lttng_condition_buffer_usage *usage;
- enum lttng_condition_status status = LTTNG_CONDITION_STATUS_OK;
-
- if (!condition || !IS_USAGE_CONDITION(condition) || !session_name ||
- strlen(session_name) == 0) {
- status = LTTNG_CONDITION_STATUS_INVALID;
- goto end;
- }
-
- usage = container_of(condition, struct lttng_condition_buffer_usage,
- parent);
- session_name_copy = strdup(session_name);
- if (!session_name_copy) {
- status = LTTNG_CONDITION_STATUS_ERROR;
- goto end;
- }
-
- if (usage->session_name) {
- free(usage->session_name);
- }
- usage->session_name = session_name_copy;
-end:
- return status;
-}
-
-enum lttng_condition_status
-lttng_condition_buffer_usage_get_channel_name(
- const struct lttng_condition *condition,
- const char **channel_name)
-{
- struct lttng_condition_buffer_usage *usage;
- enum lttng_condition_status status = LTTNG_CONDITION_STATUS_OK;
-
- if (!condition || !IS_USAGE_CONDITION(condition) || !channel_name) {
- status = LTTNG_CONDITION_STATUS_INVALID;
- goto end;
- }
-
- usage = container_of(condition, struct lttng_condition_buffer_usage,
- parent);
- if (!usage->channel_name) {
- status = LTTNG_CONDITION_STATUS_UNSET;
- goto end;
- }
- *channel_name = usage->channel_name;
-end:
- return status;
-}
-
-enum lttng_condition_status
-lttng_condition_buffer_usage_set_channel_name(
- struct lttng_condition *condition, const char *channel_name)
-{
- char *channel_name_copy;
- struct lttng_condition_buffer_usage *usage;
- enum lttng_condition_status status = LTTNG_CONDITION_STATUS_OK;
-
- if (!condition || !IS_USAGE_CONDITION(condition) || !channel_name ||
- strlen(channel_name) == 0) {
- status = LTTNG_CONDITION_STATUS_INVALID;
- goto end;
- }
-
- usage = container_of(condition, struct lttng_condition_buffer_usage,
- parent);
- channel_name_copy = strdup(channel_name);
- if (!channel_name_copy) {
- status = LTTNG_CONDITION_STATUS_ERROR;
- goto end;
- }
-
- if (usage->channel_name) {
- free(usage->channel_name);
- }
- usage->channel_name = channel_name_copy;
-end:
- return status;
-}
-
-enum lttng_condition_status
-lttng_condition_buffer_usage_get_domain_type(
- const struct lttng_condition *condition,
- enum lttng_domain_type *type)
-{
- struct lttng_condition_buffer_usage *usage;
- enum lttng_condition_status status = LTTNG_CONDITION_STATUS_OK;
-
- if (!condition || !IS_USAGE_CONDITION(condition) || !type) {
- status = LTTNG_CONDITION_STATUS_INVALID;
- goto end;
- }
-
- usage = container_of(condition, struct lttng_condition_buffer_usage,
- parent);
- if (!usage->domain.set) {
- status = LTTNG_CONDITION_STATUS_UNSET;
- goto end;
- }
- *type = usage->domain.type;
-end:
- return status;
-}
-
-enum lttng_condition_status
-lttng_condition_buffer_usage_set_domain_type(
- struct lttng_condition *condition, enum lttng_domain_type type)
-{
- struct lttng_condition_buffer_usage *usage;
- enum lttng_condition_status status = LTTNG_CONDITION_STATUS_OK;
-
- if (!condition || !IS_USAGE_CONDITION(condition) ||
- type == LTTNG_DOMAIN_NONE) {
- status = LTTNG_CONDITION_STATUS_INVALID;
- goto end;
- }
-
- usage = container_of(condition, struct lttng_condition_buffer_usage,
- parent);
- usage->domain.set = true;
- usage->domain.type = type;
-end:
- return status;
-}
-
-static
-int lttng_evaluation_buffer_usage_serialize(
- const struct lttng_evaluation *evaluation,
- struct lttng_payload *payload)
-{
- struct lttng_evaluation_buffer_usage *usage;
- struct lttng_evaluation_buffer_usage_comm comm;
-
- usage = container_of(evaluation, struct lttng_evaluation_buffer_usage,
- parent);
- comm.buffer_use = usage->buffer_use;
- comm.buffer_capacity = usage->buffer_capacity;
-
- return lttng_dynamic_buffer_append(
- &payload->buffer, &comm, sizeof(comm));
-}
-
-static
-void lttng_evaluation_buffer_usage_destroy(
- struct lttng_evaluation *evaluation)
-{
- struct lttng_evaluation_buffer_usage *usage;
-
- usage = container_of(evaluation, struct lttng_evaluation_buffer_usage,
- parent);
- free(usage);
-}
-
-LTTNG_HIDDEN
-struct lttng_evaluation *lttng_evaluation_buffer_usage_create(
- enum lttng_condition_type type, uint64_t use, uint64_t capacity)
-{
- struct lttng_evaluation_buffer_usage *usage;
-
- usage = zmalloc(sizeof(struct lttng_evaluation_buffer_usage));
- if (!usage) {
- goto end;
- }
-
- usage->parent.type = type;
- usage->buffer_use = use;
- usage->buffer_capacity = capacity;
- usage->parent.serialize = lttng_evaluation_buffer_usage_serialize;
- usage->parent.destroy = lttng_evaluation_buffer_usage_destroy;
-end:
- return &usage->parent;
-}
-
-/*
- * Get the sampled buffer usage which caused the associated condition to
- * evaluate to "true".
- */
-enum lttng_evaluation_status
-lttng_evaluation_buffer_usage_get_usage_ratio(
- const struct lttng_evaluation *evaluation, double *usage_ratio)
-{
- struct lttng_evaluation_buffer_usage *usage;
- enum lttng_evaluation_status status = LTTNG_EVALUATION_STATUS_OK;
-
- if (!evaluation || !is_usage_evaluation(evaluation) || !usage_ratio) {
- status = LTTNG_EVALUATION_STATUS_INVALID;
- goto end;
- }
-
- usage = container_of(evaluation, struct lttng_evaluation_buffer_usage,
- parent);
- *usage_ratio = (double) usage->buffer_use /
- (double) usage->buffer_capacity;
-end:
- return status;
-}
-
-enum lttng_evaluation_status
-lttng_evaluation_buffer_usage_get_usage(
- const struct lttng_evaluation *evaluation,
- uint64_t *usage_bytes)
-{
- struct lttng_evaluation_buffer_usage *usage;
- enum lttng_evaluation_status status = LTTNG_EVALUATION_STATUS_OK;
-
- if (!evaluation || !is_usage_evaluation(evaluation) || !usage_bytes) {
- status = LTTNG_EVALUATION_STATUS_INVALID;
- goto end;
- }
-
- usage = container_of(evaluation, struct lttng_evaluation_buffer_usage,
- parent);
- *usage_bytes = usage->buffer_use;
-end:
- return status;
-}
projects / lttng-tools.git / commitdiff
