/*
- * lttng-context-provider.c
- *
- * LTTng UST application context provider.
+ * SPDX-License-Identifier: LGPL-2.1-only
*
* Copyright (C) 2016 Mathieu Desnoyers <mathieu.desnoyers@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 as published by the Free Software Foundation; only
- * version 2.1 of the License.
- *
- * 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
+ * LTTng UST application context provider.
*/
+#define _LGPL_SOURCE
+#include <stddef.h>
+#include <stdint.h>
#include <sys/types.h>
#include <unistd.h>
-#include <lttng/ust-context-provider.h>
+
+#include <ust-context-provider.h>
+
+#include "context-internal.h"
#include "lttng-tracer-core.h"
#include "jhash.h"
-#include <helper.h>
+#include "context-provider-internal.h"
+#include <ust-helper.h>
+
+struct lttng_ust_registered_context_provider {
+ const struct lttng_ust_context_provider *provider;
+
+ struct cds_hlist_node node;
+};
+
+struct lttng_ust_app_ctx {
+ char *name;
+ struct lttng_ust_event_field *event_field;
+ struct lttng_ust_type_common *type;
+};
#define CONTEXT_PROVIDER_HT_BITS 12
#define CONTEXT_PROVIDER_HT_SIZE (1U << CONTEXT_PROVIDER_HT_BITS)
static struct context_provider_ht context_provider_ht;
-static struct lttng_ust_context_provider *
+static const struct lttng_ust_context_provider *
lookup_provider_by_name(const char *name)
{
struct cds_hlist_head *head;
struct cds_hlist_node *node;
- struct lttng_ust_context_provider *provider;
+ struct lttng_ust_registered_context_provider *reg_provider;
uint32_t hash;
const char *end;
size_t len;
len = strlen(name);
hash = jhash(name, len, 0);
head = &context_provider_ht.table[hash & (CONTEXT_PROVIDER_HT_SIZE - 1)];
- cds_hlist_for_each_entry(provider, node, head, node) {
- if (!strncmp(provider->name, name, len))
- return provider;
+ cds_hlist_for_each_entry(reg_provider, node, head, node) {
+ if (!strncmp(reg_provider->provider->name, name, len))
+ return reg_provider->provider;
}
return NULL;
}
-int lttng_ust_context_provider_register(struct lttng_ust_context_provider *provider)
+struct lttng_ust_registered_context_provider *lttng_ust_context_provider_register(struct lttng_ust_context_provider *provider)
{
+ struct lttng_ust_registered_context_provider *reg_provider = NULL;
struct cds_hlist_head *head;
size_t name_len = strlen(provider->name);
uint32_t hash;
- int ret = 0;
+
+ lttng_ust_fixup_tls();
/* Provider name starts with "$app.". */
- if (strncmp("$app.", provider->name, strlen("$app.") != 0))
- return -EINVAL;
- /* Provider name cannot contain a column character. */
+ if (strncmp("$app.", provider->name, strlen("$app.")) != 0)
+ return NULL;
+ /* Provider name cannot contain a colon character. */
if (strchr(provider->name, ':'))
- return -EINVAL;
- if (ust_lock()) {
- ret = -EBUSY;
+ return NULL;
+ if (ust_lock())
goto end;
- }
- if (lookup_provider_by_name(provider->name)) {
- ret = -EBUSY;
+ if (lookup_provider_by_name(provider->name))
goto end;
- }
+ reg_provider = zmalloc(sizeof(struct lttng_ust_registered_context_provider));
+ if (!reg_provider)
+ goto end;
+ reg_provider->provider = provider;
hash = jhash(provider->name, name_len, 0);
head = &context_provider_ht.table[hash & (CONTEXT_PROVIDER_HT_SIZE - 1)];
- cds_hlist_add_head(&provider->node, head);
+ cds_hlist_add_head(®_provider->node, head);
+
lttng_ust_context_set_session_provider(provider->name,
provider->get_size, provider->record,
- provider->get_value);
+ provider->get_value, provider->priv);
+
+ lttng_ust_context_set_event_notifier_group_provider(provider->name,
+ provider->get_size, provider->record,
+ provider->get_value, provider->priv);
end:
ust_unlock();
- return ret;
+ return reg_provider;
}
-void lttng_ust_context_provider_unregister(struct lttng_ust_context_provider *provider)
+void lttng_ust_context_provider_unregister(struct lttng_ust_registered_context_provider *reg_provider)
{
+ lttng_ust_fixup_tls();
+
if (ust_lock())
goto end;
- lttng_ust_context_set_session_provider(provider->name,
+ lttng_ust_context_set_session_provider(reg_provider->provider->name,
+ lttng_ust_dummy_get_size, lttng_ust_dummy_record,
+ lttng_ust_dummy_get_value, NULL);
+
+ lttng_ust_context_set_event_notifier_group_provider(reg_provider->provider->name,
lttng_ust_dummy_get_size, lttng_ust_dummy_record,
- lttng_ust_dummy_get_value);
- cds_hlist_del(&provider->node);
+ lttng_ust_dummy_get_value, NULL);
+
+ cds_hlist_del(®_provider->node);
end:
ust_unlock();
+ free(reg_provider);
+}
+
+static void destroy_app_ctx(void *priv)
+{
+ struct lttng_ust_app_ctx *app_ctx = (struct lttng_ust_app_ctx *) priv;
+
+ free(app_ctx->name);
+ free(app_ctx->event_field);
+ free(app_ctx->type);
+ free(app_ctx);
}
/*
* metadata describing the context.
*/
int lttng_ust_add_app_context_to_ctx_rcu(const char *name,
- struct lttng_ctx **ctx)
+ struct lttng_ust_ctx **ctx)
{
- struct lttng_ust_context_provider *provider;
- struct lttng_ctx_field new_field;
+ const struct lttng_ust_context_provider *provider;
+ struct lttng_ust_ctx_field new_field = { 0 };
+ struct lttng_ust_event_field *event_field = NULL;
+ struct lttng_ust_type_common *type = NULL;
+ struct lttng_ust_app_ctx *app_ctx = NULL;
+ char *ctx_name;
int ret;
if (*ctx && lttng_find_context(*ctx, name))
return -EEXIST;
- /*
- * For application context, add it by expanding
- * ctx array.
- */
- memset(&new_field, 0, sizeof(new_field));
- new_field.field_name = strdup(name);
- if (!new_field.field_name)
- return -ENOMEM;
- new_field.event_field.name = new_field.field_name;
- new_field.event_field.type.atype = atype_dynamic;
+ event_field = zmalloc(sizeof(struct lttng_ust_event_field));
+ if (!event_field) {
+ ret = -ENOMEM;
+ goto error_event_field_alloc;
+ }
+ ctx_name = strdup(name);
+ if (!ctx_name) {
+ ret = -ENOMEM;
+ goto error_field_name_alloc;
+ }
+ type = zmalloc(sizeof(struct lttng_ust_type_common));
+ if (!type) {
+ ret = -ENOMEM;
+ goto error_field_type_alloc;
+ }
+ app_ctx = zmalloc(sizeof(struct lttng_ust_app_ctx));
+ if (!app_ctx) {
+ ret = -ENOMEM;
+ goto error_app_ctx_alloc;
+ }
+ event_field->name = ctx_name;
+ type->type = lttng_ust_type_dynamic;
+ event_field->type = type;
+ new_field.event_field = event_field;
/*
* If provider is not found, we add the context anyway, but
* it will provide a dummy context.
new_field.record = lttng_ust_dummy_record;
new_field.get_value = lttng_ust_dummy_get_value;
}
- ret = lttng_context_add_rcu(ctx, &new_field);
+ new_field.destroy = destroy_app_ctx;
+ new_field.priv = app_ctx;
+ /*
+ * For application context, add it by expanding
+ * ctx array.
+ */
+ ret = lttng_ust_context_append_rcu(ctx, &new_field);
if (ret) {
- free(new_field.field_name);
+ destroy_app_ctx(app_ctx);
return ret;
}
return 0;
+
+error_app_ctx_alloc:
+ free(type);
+error_field_type_alloc:
+ free(ctx_name);
+error_field_name_alloc:
+ free(event_field);
+error_event_field_alloc:
+ return ret;
}
projects / lttng-ust.git / blobdiff