--- /dev/null
+/*
+ * Copyright (C) 2017 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
+ *
+ * This library is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License, version 2.1 only,
+ * as published by the Free Software Foundation.
+ *
+ * This library is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <assert.h>
+#include <common/error.h>
+#include <common/macros.h>
+#include <common/compat/string.h>
+#include <fcntl.h>
+#include <lttng/constant.h>
+#include <lttng/userspace-probe-internal.h>
+
+enum lttng_userspace_probe_location_lookup_method_type
+lttng_userspace_probe_location_lookup_method_get_type(
+ const struct lttng_userspace_probe_location_lookup_method *lookup_method)
+{
+ return lookup_method ? lookup_method->type :
+ LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_UNKNOWN;
+}
+
+void lttng_userspace_probe_location_lookup_method_destroy(
+ struct lttng_userspace_probe_location_lookup_method *lookup_method)
+{
+ if (!lookup_method){
+ return;
+ }
+
+ switch (lookup_method->type) {
+ case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF:
+ {
+ struct lttng_userspace_probe_location_lookup_method_elf *elf_method =
+ container_of(lookup_method,
+ struct lttng_userspace_probe_location_lookup_method_elf, parent);
+ free(elf_method);
+ break;
+ }
+ default:
+ break;
+ }
+}
+
+struct lttng_userspace_probe_location_lookup_method *
+lttng_userspace_probe_location_lookup_method_function_elf_create(void)
+{
+ struct lttng_userspace_probe_location_lookup_method *ret = NULL;
+ struct lttng_userspace_probe_location_lookup_method_elf *elf_method;
+
+ elf_method = zmalloc(sizeof(*elf_method));
+ if (!elf_method) {
+ PERROR("zmalloc");
+ goto end;
+ }
+
+ ret = &elf_method->parent;
+ ret->type = LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF;
+end:
+ return ret;
+}
+
+enum lttng_userspace_probe_location_type lttng_userspace_probe_location_get_type(
+ const struct lttng_userspace_probe_location *location)
+{
+ return location ? location->type :
+ LTTNG_USERSPACE_PROBE_LOCATION_TYPE_UNKNOWN;
+}
+
+static
+void lttng_userspace_probe_location_function_destroy(
+ struct lttng_userspace_probe_location *location)
+{
+ struct lttng_userspace_probe_location_function *location_function = NULL;
+
+ assert(location);
+
+ location_function = container_of(location,
+ struct lttng_userspace_probe_location_function, parent);
+
+ assert(location_function);
+
+ free(location_function->function_name);
+ free(location_function->binary_path);
+ if (location_function->binary_fd >= 0) {
+ if (close(location_function->binary_fd)) {
+ PERROR("close");
+ }
+ }
+ free(location);
+}
+
+void lttng_userspace_probe_location_destroy(
+ struct lttng_userspace_probe_location *location)
+{
+ if (!location) {
+ return;
+ }
+
+ lttng_userspace_probe_location_lookup_method_destroy(
+ location->lookup_method);
+
+ switch (location->type) {
+ case LTTNG_USERSPACE_PROBE_LOCATION_TYPE_FUNCTION:
+ lttng_userspace_probe_location_function_destroy(location);
+ break;
+ default:
+ free(location);
+ }
+}
+
+static struct lttng_userspace_probe_location *
+lttng_userspace_probe_location_function_create_no_check(const char *binary_path,
+ const char *function_name,
+ struct lttng_userspace_probe_location_lookup_method *lookup_method,
+ bool open_binary)
+{
+ int binary_fd = -1;
+ char *function_name_copy = NULL, *binary_path_copy = NULL;
+ struct lttng_userspace_probe_location *ret = NULL;
+ struct lttng_userspace_probe_location_function *location;
+
+ if (open_binary) {
+ binary_fd = open(binary_path, O_RDONLY);
+ if (binary_fd < 0) {
+ PERROR("Error opening the binary");
+ goto error;
+ }
+ } else {
+ binary_fd = -1;
+ }
+
+ function_name_copy = lttng_strndup(function_name, LTTNG_SYMBOL_NAME_LEN);
+ if (!function_name_copy) {
+ PERROR("Error duplicating the function name");
+ goto error;
+ }
+
+ binary_path_copy = lttng_strndup(binary_path, LTTNG_PATH_MAX);
+ if (!binary_path_copy) {
+ PERROR("Error duplicating the function name");
+ goto error;
+ }
+
+ location = zmalloc(sizeof(*location));
+ if (!location) {
+ PERROR("Error allocating userspace probe location");
+ goto error;
+ }
+
+ location->function_name = function_name_copy;
+ location->binary_path = binary_path_copy;
+ location->binary_fd = binary_fd;
+
+ ret = &location->parent;
+ ret->lookup_method = lookup_method;
+ ret->type = LTTNG_USERSPACE_PROBE_LOCATION_TYPE_FUNCTION;
+ goto end;
+
+error:
+ free(function_name_copy);
+ free(binary_path_copy);
+ if (binary_fd >= 0) {
+ if (close(binary_fd)) {
+ PERROR("Error closing binary fd in error path");
+ }
+ }
+end:
+ return ret;
+}
+
+struct lttng_userspace_probe_location *
+lttng_userspace_probe_location_function_create(const char *binary_path,
+ const char *function_name,
+ struct lttng_userspace_probe_location_lookup_method *lookup_method)
+{
+ struct lttng_userspace_probe_location *ret = NULL;
+
+ if (!binary_path || !function_name) {
+ ERR("Invalid argument(s)");
+ goto end;
+ }
+
+ switch (lttng_userspace_probe_location_lookup_method_get_type(
+ lookup_method)) {
+ case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_DEFAULT:
+ case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF:
+ break;
+ default:
+ /* Invalid probe location lookup method. */
+ goto end;
+ }
+
+ ret = lttng_userspace_probe_location_function_create_no_check(
+ binary_path, function_name, lookup_method, true);
+end:
+ return ret;
+}
+
+const char *lttng_userspace_probe_location_function_get_binary_path(
+ const struct lttng_userspace_probe_location *location)
+{
+ const char *ret = NULL;
+ struct lttng_userspace_probe_location_function *function_location;
+
+ if (!location || lttng_userspace_probe_location_get_type(location) !=
+ LTTNG_USERSPACE_PROBE_LOCATION_TYPE_FUNCTION) {
+ ERR("Invalid argument(s)");
+ goto end;
+ }
+
+ function_location = container_of(location,
+ struct lttng_userspace_probe_location_function,
+ parent);
+ ret = function_location->binary_path;
+end:
+ return ret;
+}
+
+const char *lttng_userspace_probe_location_function_get_function_name(
+ const struct lttng_userspace_probe_location *location)
+{
+ const char *ret = NULL;
+ struct lttng_userspace_probe_location_function *function_location;
+
+ if (!location || lttng_userspace_probe_location_get_type(location) !=
+ LTTNG_USERSPACE_PROBE_LOCATION_TYPE_FUNCTION) {
+ ERR("Invalid argument(s)");
+ goto end;
+ }
+
+ function_location = container_of(location,
+ struct lttng_userspace_probe_location_function, parent);
+ ret = function_location->function_name;
+end:
+ return ret;
+}
+
+int lttng_userspace_probe_location_function_get_binary_fd(
+ const struct lttng_userspace_probe_location *location)
+{
+ int ret = -1;
+ struct lttng_userspace_probe_location_function *function_location;
+
+ if (!location || lttng_userspace_probe_location_get_type(location) !=
+ LTTNG_USERSPACE_PROBE_LOCATION_TYPE_FUNCTION) {
+ ERR("Invalid argument(s)");
+ goto end;
+ }
+
+ function_location = container_of(location,
+ struct lttng_userspace_probe_location_function, parent);
+ ret = function_location->binary_fd;
+end:
+ return ret;
+}
+
+static struct lttng_userspace_probe_location_lookup_method *
+lttng_userspace_probe_location_function_get_lookup_method(
+ const struct lttng_userspace_probe_location *location)
+{
+ struct lttng_userspace_probe_location_lookup_method *ret = NULL;
+
+ if (!location || lttng_userspace_probe_location_get_type(location) !=
+ LTTNG_USERSPACE_PROBE_LOCATION_TYPE_FUNCTION) {
+ ERR("Invalid argument(s)");
+ goto end;
+ }
+
+ ret = location->lookup_method;
+end:
+ return ret;
+}
+
+struct lttng_userspace_probe_location_lookup_method *
+lttng_userspace_probe_location_get_lookup_method(
+ const struct lttng_userspace_probe_location *location)
+{
+ struct lttng_userspace_probe_location_lookup_method *ret = NULL;
+
+ assert(location);
+ switch (location->type) {
+ case LTTNG_USERSPACE_PROBE_LOCATION_TYPE_FUNCTION:
+ ret = lttng_userspace_probe_location_function_get_lookup_method(
+ location);
+ break;
+ default:
+ ERR("Unknowned lookup method.");
+ break;
+ }
+ return ret;
+}
+
+static
+int lttng_userspace_probe_location_lookup_method_serialize(
+ struct lttng_userspace_probe_location_lookup_method *method,
+ struct lttng_dynamic_buffer *buffer)
+{
+ int ret;
+ struct lttng_userspace_probe_location_lookup_method_comm
+ lookup_method_comm;
+
+ lookup_method_comm.type = (int8_t) (method ? method->type :
+ LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_DEFAULT);
+ if (buffer) {
+ ret = lttng_dynamic_buffer_append(buffer, &lookup_method_comm,
+ sizeof(lookup_method_comm));
+ if (ret) {
+ goto end;
+ }
+ }
+ ret = sizeof(lookup_method_comm);
+end:
+ return ret;
+}
+
+static
+int lttng_userspace_probe_location_function_serialize(
+ const struct lttng_userspace_probe_location *location,
+ struct lttng_dynamic_buffer *buffer,
+ int *binary_fd)
+{
+ int ret;
+ size_t function_name_len, binary_path_len;
+ struct lttng_userspace_probe_location_function *location_function;
+ struct lttng_userspace_probe_location_function_comm location_function_comm;
+
+ assert(location);
+ assert(lttng_userspace_probe_location_get_type(location) ==
+ LTTNG_USERSPACE_PROBE_LOCATION_TYPE_FUNCTION);
+
+ location_function = container_of(location,
+ struct lttng_userspace_probe_location_function,
+ parent);
+ if (!location_function->function_name || !location_function->binary_path) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ if (binary_fd && location_function->binary_fd < 0) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ if (binary_fd) {
+ *binary_fd = location_function->binary_fd;
+ }
+
+ function_name_len = strlen(location_function->function_name);
+ if (function_name_len == 0) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+ binary_path_len = strlen(location_function->binary_path);
+ if (binary_path_len == 0) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ location_function_comm.function_name_len = function_name_len + 1;
+ location_function_comm.binary_path_len = binary_path_len + 1;
+
+ if (buffer) {
+ ret = lttng_dynamic_buffer_append(buffer,
+ &location_function_comm,
+ sizeof(location_function_comm));
+ if (ret) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+ ret = lttng_dynamic_buffer_append(buffer,
+ location_function->function_name,
+ location_function_comm.function_name_len);
+ if (ret) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+ ret = lttng_dynamic_buffer_append(buffer,
+ location_function->binary_path,
+ location_function_comm.binary_path_len);
+ if (ret) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+ }
+ ret = sizeof(location_function_comm) +
+ location_function_comm.function_name_len +
+ location_function_comm.binary_path_len;
+end:
+ return ret;
+}
+
+LTTNG_HIDDEN
+int lttng_userspace_probe_location_serialize(
+ const struct lttng_userspace_probe_location *location,
+ struct lttng_dynamic_buffer *buffer,
+ int *binary_fd)
+{
+ int ret, buffer_use = 0;
+ struct lttng_userspace_probe_location_comm location_generic_comm;
+
+ if (!location) {
+ ERR("Invalid argument(s)");
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ location_generic_comm.type = (int8_t) location->type;
+ if (buffer) {
+ ret = lttng_dynamic_buffer_append(buffer, &location_generic_comm,
+ sizeof(location_generic_comm));
+ if (ret) {
+ goto end;
+ }
+ }
+ buffer_use += sizeof(location_generic_comm);
+
+ switch (lttng_userspace_probe_location_get_type(location)) {
+ case LTTNG_USERSPACE_PROBE_LOCATION_TYPE_FUNCTION:
+ ret = lttng_userspace_probe_location_function_serialize(
+ location, buffer, binary_fd);
+ break;
+ default:
+ ERR("Unsupported probe location type");
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+ if (ret < 0) {
+ goto end;
+ }
+ buffer_use += ret;
+
+ ret = lttng_userspace_probe_location_lookup_method_serialize(
+ location->lookup_method, buffer);
+ if (ret < 0) {
+ goto end;
+ }
+ ret += buffer_use;
+end:
+ return ret;
+}
+
+static
+int lttng_userspace_probe_location_function_create_from_buffer(
+ const struct lttng_buffer_view *buffer,
+ struct lttng_userspace_probe_location **location)
+{
+ struct lttng_userspace_probe_location_function_comm *location_function_comm;
+ const char *function_name_src, *binary_path_src;
+ char *function_name = NULL, *binary_path = NULL;
+ int ret = 0;
+
+ assert(buffer);
+ assert(buffer->data);
+ assert(location);
+
+ location_function_comm =
+ (struct lttng_userspace_probe_location_function_comm *) buffer->data;
+
+ const size_t expected_size = sizeof(*location_function_comm) +
+ location_function_comm->function_name_len +
+ location_function_comm->binary_path_len;
+
+ if (buffer->size < expected_size) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ function_name_src = buffer->data + sizeof(*location_function_comm);
+ binary_path_src = function_name_src +
+ location_function_comm->function_name_len;
+
+ if (function_name_src[location_function_comm->function_name_len - 1] != '\0') {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+ if (binary_path_src[location_function_comm->binary_path_len - 1] != '\0') {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ function_name = lttng_strndup(function_name_src, LTTNG_SYMBOL_NAME_LEN);
+ if (!function_name) {
+ PERROR("lttng_strndup");
+ goto end;
+ }
+
+ binary_path = lttng_strndup(binary_path_src, LTTNG_PATH_MAX);
+ if (!binary_path) {
+ PERROR("lttng_strndup");
+ goto end;
+ }
+
+ *location = lttng_userspace_probe_location_function_create_no_check(
+ binary_path, function_name, NULL, false);
+ if (!(*location)) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ ret = (int) expected_size;
+end:
+ free(function_name);
+ free(binary_path);
+ return ret;
+}
+
+static
+int lttng_userspace_probe_location_lookup_method_create_from_buffer(
+ struct lttng_buffer_view *buffer,
+ struct lttng_userspace_probe_location_lookup_method **lookup_method)
+{
+ int ret;
+ struct lttng_userspace_probe_location_lookup_method_comm *lookup_comm;
+ enum lttng_userspace_probe_location_lookup_method_type type;
+
+ assert(buffer);
+ assert(buffer->data);
+ assert(lookup_method);
+
+ if (buffer->size < sizeof(*lookup_comm)) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ lookup_comm = (struct lttng_userspace_probe_location_lookup_method_comm *)
+ buffer->data;
+ type = (enum lttng_userspace_probe_location_lookup_method_type)
+ lookup_comm->type;
+ switch (type) {
+ case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_DEFAULT:
+ *lookup_method = NULL;
+ break;
+ case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF:
+ *lookup_method =
+ lttng_userspace_probe_location_lookup_method_function_elf_create();
+ if (!(*lookup_method)) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+ break;
+ default:
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ ret = sizeof(*lookup_comm);
+end:
+ return ret;
+}
+
+LTTNG_HIDDEN
+int lttng_userspace_probe_location_create_from_buffer(
+ const struct lttng_buffer_view *buffer,
+ struct lttng_userspace_probe_location **location)
+{
+ struct lttng_userspace_probe_location_lookup_method *lookup_method;
+ struct lttng_userspace_probe_location_comm *probe_location_comm;
+ enum lttng_userspace_probe_location_type type;
+ struct lttng_buffer_view lookup_method_view;
+ int consumed = 0;
+ int ret;
+
+
+ assert(buffer);
+ assert(buffer->data);
+ assert(location);
+
+ lookup_method = NULL;
+
+ if (buffer->size <= sizeof(*probe_location_comm)) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ probe_location_comm =
+ (struct lttng_userspace_probe_location_comm *) buffer->data;
+ type = (enum lttng_userspace_probe_location_type) probe_location_comm->type;
+ consumed += sizeof(*probe_location_comm);
+
+ switch (type) {
+ case LTTNG_USERSPACE_PROBE_LOCATION_TYPE_FUNCTION:
+ {
+ struct lttng_buffer_view view = lttng_buffer_view_from_view(
+ buffer, consumed, buffer->size - consumed);
+
+ ret = lttng_userspace_probe_location_function_create_from_buffer(
+ &view, location);
+ if (ret < 0) {
+ goto end;
+ }
+ break;
+ }
+ default:
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ consumed += ret;
+ if (buffer->size <= consumed) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ lookup_method_view = lttng_buffer_view_from_view(buffer, consumed,
+ buffer->size - consumed);
+ ret = lttng_userspace_probe_location_lookup_method_create_from_buffer(
+ &lookup_method_view, &lookup_method);
+ if (ret < 0) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ assert(lookup_method);
+ (*location)->lookup_method = lookup_method;
+ lookup_method = NULL;
+ ret += consumed;
+end:
+ return ret;
+}
+
+LTTNG_HIDDEN
+int lttng_userspace_probe_location_function_set_binary_fd(
+ struct lttng_userspace_probe_location *location, int binary_fd)
+{
+ int ret = 0;
+ struct lttng_userspace_probe_location_function *function_location;
+
+ assert(location);
+ assert(location->type == LTTNG_USERSPACE_PROBE_LOCATION_TYPE_FUNCTION);
+
+ function_location = container_of(location,
+ struct lttng_userspace_probe_location_function, parent);
+ if (function_location->binary_fd >= 0) {
+ ret = close(function_location->binary_fd);
+ if (ret) {
+ PERROR("close");
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+ }
+
+ function_location->binary_fd = binary_fd;
+end:
+ return ret;
+}
+
+static
+int lttng_userspace_probe_location_function_flatten(
+ const struct lttng_userspace_probe_location *location,
+ struct lttng_dynamic_buffer *buffer)
+{
+ struct lttng_userspace_probe_location_lookup_method_elf flat_lookup_method;
+ struct lttng_userspace_probe_location_function *probe_function;
+ struct lttng_userspace_probe_location_function flat_probe;
+ size_t function_name_len, binary_path_len;
+ size_t padding_needed = 0;
+ char *flat_probe_start;
+ int storage_needed = 0;
+ int ret;
+
+ assert(location);
+
+ if (location->lookup_method && location->lookup_method->type !=
+ LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ probe_function = container_of(location,
+ struct lttng_userspace_probe_location_function,
+ parent);
+ assert(probe_function->function_name);
+ assert(probe_function->binary_path);
+
+ storage_needed +=
+ sizeof(struct lttng_userspace_probe_location_function);
+ function_name_len = strlen(probe_function->function_name) + 1;
+ binary_path_len = strlen(probe_function->binary_path) + 1;
+ storage_needed += function_name_len + binary_path_len;
+
+ /*
+ * The lookup method is aligned to 64-bit within the buffer.
+ * This is needed even if there is no lookup method since
+ * the next structure in the buffer probably needs to be
+ * aligned too (depending on the arch).
+ */
+ padding_needed = ALIGN_TO(storage_needed, sizeof(uint64_t)) - storage_needed;
+ storage_needed += padding_needed;
+
+ if (location->lookup_method) {
+ /* NOTE: elf look-up method is assumed here. */
+ storage_needed += sizeof(struct lttng_userspace_probe_location_lookup_method_elf);
+ }
+
+ if (!buffer) {
+ ret = storage_needed;
+ goto end;
+ }
+
+ if (lttng_dynamic_buffer_get_capacity_left(buffer) < storage_needed) {
+ ret = lttng_dynamic_buffer_set_capacity(buffer,
+ buffer->size + storage_needed);
+ if (ret) {
+ goto end;
+ }
+ }
+
+ memset(&flat_probe, 0, sizeof(flat_probe));
+
+ flat_probe_start = buffer->data + buffer->size;
+ flat_probe.parent.type = location->type;
+ /*
+ * The lookup method, if present, is the last element in the flat
+ * representation of the probe.
+ */
+ if (location->lookup_method) {
+ flat_probe.parent.lookup_method =
+ (struct lttng_userspace_probe_location_lookup_method *)
+ (flat_probe_start + sizeof(flat_probe) +
+ function_name_len + binary_path_len + padding_needed);
+ } else {
+ flat_probe.parent.lookup_method = NULL;
+ }
+
+ flat_probe.function_name = flat_probe_start + sizeof(flat_probe);
+ flat_probe.binary_path = flat_probe.function_name + function_name_len;
+ flat_probe.binary_fd = -1;
+ ret = lttng_dynamic_buffer_append(buffer, &flat_probe,
+ sizeof(flat_probe));
+ if (ret) {
+ goto end;
+ }
+
+ ret = lttng_dynamic_buffer_append(buffer,
+ probe_function->function_name, function_name_len);
+ if (ret) {
+ goto end;
+ }
+ ret = lttng_dynamic_buffer_append(buffer,
+ probe_function->binary_path, binary_path_len);
+ if (ret) {
+ goto end;
+ }
+
+ /* Insert padding before the lookup method. */
+ ret = lttng_dynamic_buffer_set_size(buffer,
+ buffer->size + padding_needed);
+ if (ret) {
+ goto end;
+ }
+
+ if (!location->lookup_method) {
+ /* Not an error, the default method is used. */
+ ret = storage_needed;
+ goto end;
+ }
+
+ memset(&flat_lookup_method, 0, sizeof(flat_lookup_method));
+ flat_lookup_method.parent.type =
+ LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF;
+ ret = lttng_dynamic_buffer_append(buffer,
+ &flat_lookup_method, sizeof(flat_lookup_method));
+ if (ret) {
+ goto end;
+ }
+ ret = storage_needed;
+end:
+ return ret;
+}
+
+LTTNG_HIDDEN
+int lttng_userspace_probe_location_flatten(
+ const struct lttng_userspace_probe_location *location,
+ struct lttng_dynamic_buffer *buffer)
+{
+ int ret;
+ if (!location) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ /* Only types currently supported. */
+ switch (location->type) {
+ case LTTNG_USERSPACE_PROBE_LOCATION_TYPE_FUNCTION:
+ ret = lttng_userspace_probe_location_function_flatten(location, buffer);
+ break;
+ default:
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+end:
+ return ret;
+}
projects / lttng-tools.git / commitdiff
