X-Git-Url: http://git.liburcu.org/?a=blobdiff_plain;f=liblttng-ust%2Flttng-probes.c;h=862b19e7c47e3c7c5b5e262e5b1bc02edf3c090f;hb=HEAD;hp=a09497f87ba444adc58a1765d0757a04fda7a809;hpb=0fdd0b8989a06910521827f82058f7100d9b6b8e;p=lttng-ust.git

diff --git a/liblttng-ust/lttng-probes.c b/liblttng-ust/lttng-probes.c
deleted file mode 100644
index a09497f8..00000000
--- a/liblttng-ust/lttng-probes.c
+++ /dev/null
@@ -1,447 +0,0 @@
-/*
- * lttng-probes.c
- *
- * Holds LTTng probes registry.
- *
- * Copyright 2010-2012 (c) - 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
- */
-
-#define _LGPL_SOURCE
-#include <string.h>
-#include <errno.h>
-#include <urcu/list.h>
-#include <urcu/hlist.h>
-#include <lttng/ust-events.h>
-#include <lttng/tracepoint.h>
-#include "tracepoint-internal.h"
-#include <assert.h>
-#include <helper.h>
-#include <ctype.h>
-
-#include "lttng-tracer-core.h"
-#include "jhash.h"
-#include "error.h"
-
-/*
- * probe list is protected by ust_lock()/ust_unlock().
- */
-static CDS_LIST_HEAD(_probe_list);
-
-/*
- * List of probes registered by not yet processed.
- */
-static CDS_LIST_HEAD(lazy_probe_init);
-
-/*
- * lazy_nesting counter ensures we don't trigger lazy probe registration
- * fixup while we are performing the fixup. It is protected by the ust
- * mutex.
- */
-static int lazy_nesting;
-
-/*
- * Called under ust lock.
- */
-static
-int check_event_provider(struct lttng_probe_desc *desc)
-{
-	int i;
-	size_t provider_name_len;
-
-	provider_name_len = strnlen(desc->provider,
-				LTTNG_UST_SYM_NAME_LEN - 1);
-	for (i = 0; i < desc->nr_events; i++) {
-		if (strncmp(desc->event_desc[i]->name,
-				desc->provider,
-				provider_name_len))
-			return 0;	/* provider mismatch */
-	}
-	return 1;
-}
-
-/*
- * Called under ust lock.
- */
-static
-void lttng_lazy_probe_register(struct lttng_probe_desc *desc)
-{
-	struct lttng_probe_desc *iter;
-	struct cds_list_head *probe_list;
-
-	/*
-	 * Each provider enforce that every event name begins with the
-	 * provider name. Check this in an assertion for extra
-	 * carefulness. This ensures we cannot have duplicate event
-	 * names across providers.
-	 */
-	assert(check_event_provider(desc));
-
-	/*
-	 * The provider ensures there are no duplicate event names.
-	 * Duplicated TRACEPOINT_EVENT event names would generate a
-	 * compile-time error due to duplicated symbol names.
-	 */
-
-	/*
-	 * We sort the providers by struct lttng_probe_desc pointer
-	 * address.
-	 */
-	probe_list = &_probe_list;
-	cds_list_for_each_entry_reverse(iter, probe_list, head) {
-		BUG_ON(iter == desc); /* Should never be in the list twice */
-		if (iter < desc) {
-			/* We belong to the location right after iter. */
-			cds_list_add(&desc->head, &iter->head);
-			goto desc_added;
-		}
-	}
-	/* We should be added at the head of the list */
-	cds_list_add(&desc->head, probe_list);
-desc_added:
-	DBG("just registered probe %s containing %u events",
-		desc->provider, desc->nr_events);
-}
-
-/*
- * Called under ust lock.
- */
-static
-void fixup_lazy_probes(void)
-{
-	struct lttng_probe_desc *iter, *tmp;
-	int ret;
-
-	lazy_nesting++;
-	cds_list_for_each_entry_safe(iter, tmp,
-			&lazy_probe_init, lazy_init_head) {
-		lttng_lazy_probe_register(iter);
-		iter->lazy = 0;
-		cds_list_del(&iter->lazy_init_head);
-	}
-	ret = lttng_fix_pending_events();
-	assert(!ret);
-	lazy_nesting--;
-}
-
-/*
- * Called under ust lock.
- */
-struct cds_list_head *lttng_get_probe_list_head(void)
-{
-	if (!lazy_nesting && !cds_list_empty(&lazy_probe_init))
-		fixup_lazy_probes();
-	return &_probe_list;
-}
-
-static
-int check_provider_version(struct lttng_probe_desc *desc)
-{
-	/*
-	 * Check tracepoint provider version compatibility.
-	 */
-	if (desc->major <= LTTNG_UST_PROVIDER_MAJOR) {
-		DBG("Provider \"%s\" accepted, version %u.%u is compatible "
-			"with LTTng UST provider version %u.%u.",
-			desc->provider, desc->major, desc->minor,
-			LTTNG_UST_PROVIDER_MAJOR,
-			LTTNG_UST_PROVIDER_MINOR);
-		if (desc->major < LTTNG_UST_PROVIDER_MAJOR) {
-			DBG("However, some LTTng UST features might not be "
-				"available for this provider unless it is "
-				"recompiled against a more recent LTTng UST.");
-		}
-		return 1;		/* accept */
-	} else {
-		ERR("Provider \"%s\" rejected, version %u.%u is incompatible "
-			"with LTTng UST provider version %u.%u. Please upgrade "
-			"LTTng UST.",
-			desc->provider, desc->major, desc->minor,
-			LTTNG_UST_PROVIDER_MAJOR,
-			LTTNG_UST_PROVIDER_MINOR);
-		return 0;		/* reject */
-	}
-}
-
-
-int lttng_probe_register(struct lttng_probe_desc *desc)
-{
-	int ret = 0;
-
-	lttng_ust_fixup_tls();
-
-	/*
-	 * If version mismatch, don't register, but don't trigger assert
-	 * on caller. The version check just prints an error.
-	 */
-	if (!check_provider_version(desc))
-		return 0;
-
-	ust_lock_nocheck();
-
-	cds_list_add(&desc->lazy_init_head, &lazy_probe_init);
-	desc->lazy = 1;
-	DBG("adding probe %s containing %u events to lazy registration list",
-		desc->provider, desc->nr_events);
-	/*
-	 * If there is at least one active session, we need to register
-	 * the probe immediately, since we cannot delay event
-	 * registration because they are needed ASAP.
-	 */
-	if (lttng_session_active())
-		fixup_lazy_probes();
-
-	ust_unlock();
-	return ret;
-}
-
-/* Backward compatibility with UST 2.0 */
-int ltt_probe_register(struct lttng_probe_desc *desc)
-{
-	return lttng_probe_register(desc);
-}
-
-void lttng_probe_unregister(struct lttng_probe_desc *desc)
-{
-	lttng_ust_fixup_tls();
-
-	if (!check_provider_version(desc))
-		return;
-
-	ust_lock_nocheck();
-	if (!desc->lazy)
-		cds_list_del(&desc->head);
-	else
-		cds_list_del(&desc->lazy_init_head);
-	DBG("just unregistered probe %s", desc->provider);
-	ust_unlock();
-}
-
-/* Backward compatibility with UST 2.0 */
-void ltt_probe_unregister(struct lttng_probe_desc *desc)
-{
-	lttng_probe_unregister(desc);
-}
-
-void lttng_probes_prune_event_list(struct lttng_ust_tracepoint_list *list)
-{
-	struct tp_list_entry *list_entry, *tmp;
-
-	cds_list_for_each_entry_safe(list_entry, tmp, &list->head, head) {
-		cds_list_del(&list_entry->head);
-		free(list_entry);
-	}
-}
-
-/*
- * called with UST lock held.
- */
-int lttng_probes_get_event_list(struct lttng_ust_tracepoint_list *list)
-{
-	struct lttng_probe_desc *probe_desc;
-	int i;
-	struct cds_list_head *probe_list;
-
-	probe_list = lttng_get_probe_list_head();
-	CDS_INIT_LIST_HEAD(&list->head);
-	cds_list_for_each_entry(probe_desc, probe_list, head) {
-		for (i = 0; i < probe_desc->nr_events; i++) {
-			struct tp_list_entry *list_entry;
-
-			list_entry = zmalloc(sizeof(*list_entry));
-			if (!list_entry)
-				goto err_nomem;
-			cds_list_add(&list_entry->head, &list->head);
-			strncpy(list_entry->tp.name,
-				probe_desc->event_desc[i]->name,
-				LTTNG_UST_SYM_NAME_LEN);
-			list_entry->tp.name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
-			if (!probe_desc->event_desc[i]->loglevel) {
-				list_entry->tp.loglevel = TRACE_DEFAULT;
-			} else {
-				list_entry->tp.loglevel = *(*probe_desc->event_desc[i]->loglevel);
-			}
-		}
-	}
-	if (cds_list_empty(&list->head))
-		list->iter = NULL;
-	else
-		list->iter =
-			cds_list_first_entry(&list->head, struct tp_list_entry, head);
-	return 0;
-
-err_nomem:
-	lttng_probes_prune_event_list(list);
-	return -ENOMEM;
-}
-
-/*
- * Return current iteration position, advance internal iterator to next.
- * Return NULL if end of list.
- */
-struct lttng_ust_tracepoint_iter *
-	lttng_ust_tracepoint_list_get_iter_next(struct lttng_ust_tracepoint_list *list)
-{
-	struct tp_list_entry *entry;
-
-	if (!list->iter)
-		return NULL;
-	entry = list->iter;
-	if (entry->head.next == &list->head)
-		list->iter = NULL;
-	else
-		list->iter = cds_list_entry(entry->head.next,
-				struct tp_list_entry, head);
-	return &entry->tp;
-}
-
-void lttng_probes_prune_field_list(struct lttng_ust_field_list *list)
-{
-	struct tp_field_list_entry *list_entry, *tmp;
-
-	cds_list_for_each_entry_safe(list_entry, tmp, &list->head, head) {
-		cds_list_del(&list_entry->head);
-		free(list_entry);
-	}
-}
-
-/*
- * called with UST lock held.
- */
-int lttng_probes_get_field_list(struct lttng_ust_field_list *list)
-{
-	struct lttng_probe_desc *probe_desc;
-	int i;
-	struct cds_list_head *probe_list;
-
-	probe_list = lttng_get_probe_list_head();
-	CDS_INIT_LIST_HEAD(&list->head);
-	cds_list_for_each_entry(probe_desc, probe_list, head) {
-		for (i = 0; i < probe_desc->nr_events; i++) {
-			const struct lttng_event_desc *event_desc =
-				probe_desc->event_desc[i];
-			int j;
-
-			if (event_desc->nr_fields == 0) {
-				/* Events without fields. */
-				struct tp_field_list_entry *list_entry;
-
-				list_entry = zmalloc(sizeof(*list_entry));
-				if (!list_entry)
-					goto err_nomem;
-				cds_list_add(&list_entry->head, &list->head);
-				strncpy(list_entry->field.event_name,
-					event_desc->name,
-					LTTNG_UST_SYM_NAME_LEN);
-				list_entry->field.event_name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
-				list_entry->field.field_name[0] = '\0';
-				list_entry->field.type = LTTNG_UST_FIELD_OTHER;
-				if (!event_desc->loglevel) {
-					list_entry->field.loglevel = TRACE_DEFAULT;
-				} else {
-					list_entry->field.loglevel = *(*event_desc->loglevel);
-				}
-				list_entry->field.nowrite = 1;
-			}
-
-			for (j = 0; j < event_desc->nr_fields; j++) {
-				const struct lttng_event_field *event_field =
-					&event_desc->fields[j];
-				struct tp_field_list_entry *list_entry;
-
-				list_entry = zmalloc(sizeof(*list_entry));
-				if (!list_entry)
-					goto err_nomem;
-				cds_list_add(&list_entry->head, &list->head);
-				strncpy(list_entry->field.event_name,
-					event_desc->name,
-					LTTNG_UST_SYM_NAME_LEN);
-				list_entry->field.event_name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
-				strncpy(list_entry->field.field_name,
-					event_field->name,
-					LTTNG_UST_SYM_NAME_LEN);
-				list_entry->field.field_name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
-				switch (event_field->type.atype) {
-				case atype_integer:
-					list_entry->field.type = LTTNG_UST_FIELD_INTEGER;
-					break;
-				case atype_string:
-					list_entry->field.type = LTTNG_UST_FIELD_STRING;
-					break;
-				case atype_array:
-					if (event_field->type.u.array.elem_type.atype != atype_integer
-						|| event_field->type.u.array.elem_type.u.basic.integer.encoding == lttng_encode_none)
-						list_entry->field.type = LTTNG_UST_FIELD_OTHER;
-					else
-						list_entry->field.type = LTTNG_UST_FIELD_STRING;
-					break;
-				case atype_sequence:
-					if (event_field->type.u.sequence.elem_type.atype != atype_integer
-						|| event_field->type.u.sequence.elem_type.u.basic.integer.encoding == lttng_encode_none)
-						list_entry->field.type = LTTNG_UST_FIELD_OTHER;
-					else
-						list_entry->field.type = LTTNG_UST_FIELD_STRING;
-					break;
-				case atype_float:
-					list_entry->field.type = LTTNG_UST_FIELD_FLOAT;
-					break;
-				case atype_enum:
-					list_entry->field.type = LTTNG_UST_FIELD_ENUM;
-					break;
-				default:
-					list_entry->field.type = LTTNG_UST_FIELD_OTHER;
-				}
-				if (!event_desc->loglevel) {
-					list_entry->field.loglevel = TRACE_DEFAULT;
-				} else {
-					list_entry->field.loglevel = *(*event_desc->loglevel);
-				}
-				list_entry->field.nowrite = event_field->nowrite;
-			}
-		}
-	}
-	if (cds_list_empty(&list->head))
-		list->iter = NULL;
-	else
-		list->iter =
-			cds_list_first_entry(&list->head,
-				struct tp_field_list_entry, head);
-	return 0;
-
-err_nomem:
-	lttng_probes_prune_field_list(list);
-	return -ENOMEM;
-}
-
-/*
- * Return current iteration position, advance internal iterator to next.
- * Return NULL if end of list.
- */
-struct lttng_ust_field_iter *
-	lttng_ust_field_list_get_iter_next(struct lttng_ust_field_list *list)
-{
-	struct tp_field_list_entry *entry;
-
-	if (!list->iter)
-		return NULL;
-	entry = list->iter;
-	if (entry->head.next == &list->head)
-		list->iter = NULL;
-	else
-		list->iter = cds_list_entry(entry->head.next,
-				struct tp_field_list_entry, head);
-	return &entry->field;
-}