+++ /dev/null
-/*
- * SPDX-License-Identifier: LGPL-2.1-only
- *
- * Copyright (C) 2016 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- *
- * LTTng UST application context provider.
- */
-
-#define _LGPL_SOURCE
-#include <stddef.h>
-#include <stdint.h>
-#include <sys/types.h>
-#include <unistd.h>
-
-#include <ust-context-provider.h>
-
-#include "context-internal.h"
-#include "lttng-tracer-core.h"
-#include "jhash.h"
-#include "context-provider-internal.h"
-#include <ust-helper.h>
-
-#define CONTEXT_PROVIDER_HT_BITS 12
-#define CONTEXT_PROVIDER_HT_SIZE (1U << CONTEXT_PROVIDER_HT_BITS)
-struct context_provider_ht {
- struct cds_hlist_head table[CONTEXT_PROVIDER_HT_SIZE];
-};
-
-static struct context_provider_ht context_provider_ht;
-
-static 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;
- uint32_t hash;
- const char *end;
- size_t len;
-
- /* Lookup using everything before first ':' as key. */
- end = strchr(name, ':');
- if (end)
- len = end - name;
- else
- 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;
- }
- return NULL;
-}
-
-int lttng_ust_context_provider_register(struct lttng_ust_context_provider *provider)
-{
- 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 colon character. */
- if (strchr(provider->name, ':'))
- return -EINVAL;
- if (ust_lock()) {
- ret = -EBUSY;
- goto end;
- }
- if (lookup_provider_by_name(provider->name)) {
- ret = -EBUSY;
- goto end;
- }
- 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);
-
- lttng_ust_context_set_session_provider(provider->name,
- provider->get_size, provider->record,
- provider->get_value);
-
- lttng_ust_context_set_event_notifier_group_provider(provider->name,
- provider->get_size, provider->record,
- provider->get_value);
-end:
- ust_unlock();
- return ret;
-}
-
-void lttng_ust_context_provider_unregister(struct lttng_ust_context_provider *provider)
-{
- lttng_ust_fixup_tls();
-
- if (ust_lock())
- goto end;
- lttng_ust_context_set_session_provider(provider->name,
- lttng_ust_dummy_get_size, lttng_ust_dummy_record,
- lttng_ust_dummy_get_value);
-
- lttng_ust_context_set_event_notifier_group_provider(provider->name,
- lttng_ust_dummy_get_size, lttng_ust_dummy_record,
- lttng_ust_dummy_get_value);
-
- cds_hlist_del(&provider->node);
-end:
- ust_unlock();
-}
-
-/*
- * Called with ust mutex held.
- * Add application context to array of context, even if the application
- * context is not currently loaded by application. It will then use the
- * dummy callbacks in that case.
- * Always performed before tracing is started, since it modifies
- * metadata describing the context.
- */
-int lttng_ust_add_app_context_to_ctx_rcu(const char *name,
- struct lttng_ust_ctx **ctx)
-{
- struct lttng_ust_context_provider *provider;
- struct lttng_ust_ctx_field *new_field = NULL;
- int ret;
-
- if (*ctx && lttng_find_context(*ctx, name))
- return -EEXIST;
- new_field = zmalloc(sizeof(struct lttng_ust_ctx_field));
- if (!new_field) {
- ret = -ENOMEM;
- goto error_field_alloc;
- }
- new_field->struct_size = sizeof(struct lttng_ust_ctx_field);
- new_field->event_field = zmalloc(sizeof(struct lttng_ust_event_field));
- if (!new_field->event_field) {
- ret = -ENOMEM;
- goto error_event_field_alloc;
- }
- new_field->field_name = strdup(name);
- if (!new_field->field_name) {
- ret = -ENOMEM;
- goto error_field_name_alloc;
- }
- new_field->event_field->name = new_field->field_name;
- new_field->event_field->type.atype = atype_dynamic;
- /*
- * If provider is not found, we add the context anyway, but
- * it will provide a dummy context.
- */
- provider = lookup_provider_by_name(name);
- if (provider) {
- new_field->get_size = provider->get_size;
- new_field->record = provider->record;
- new_field->get_value = provider->get_value;
- } else {
- new_field->get_size = lttng_ust_dummy_get_size;
- new_field->record = lttng_ust_dummy_record;
- new_field->get_value = lttng_ust_dummy_get_value;
- }
- /*
- * For application context, add it by expanding
- * ctx array. Ownership of new_field is passed to the callee on
- * success.
- */
- ret = lttng_context_add_rcu(ctx, new_field);
- if (ret) {
- free(new_field->field_name);
- free(new_field->event_field);
- free(new_field);
- return ret;
- }
- return 0;
-
-error_field_name_alloc:
- free(new_field->event_field);
-error_event_field_alloc:
- free(new_field);
-error_field_alloc:
- return ret;
-}
projects / lttng-ust.git / blobdiff