+++ /dev/null
-/*
- * lttng-events.c
- *
- * Holds LTTng per-session event registry.
- *
- * Copyright (C) 2010-2012 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 _GNU_SOURCE
-#include <stdio.h>
-#include <urcu/list.h>
-#include <urcu/hlist.h>
-#include <pthread.h>
-#include <errno.h>
-#include <sys/shm.h>
-#include <sys/ipc.h>
-#include <stdint.h>
-#include <stddef.h>
-#include <inttypes.h>
-#include <time.h>
-#include <lttng/ust-endian.h>
-#include "clock.h"
-
-#include <urcu-bp.h>
-#include <urcu/compiler.h>
-#include <urcu/uatomic.h>
-#include <urcu/arch.h>
-
-#include <lttng/tracepoint.h>
-#include <lttng/ust-events.h>
-
-#include <usterr-signal-safe.h>
-#include <helper.h>
-#include <ust-ctl.h>
-#include <ust-comm.h>
-#include "error.h"
-#include "compat.h"
-#include "lttng-ust-uuid.h"
-
-#include "tracepoint-internal.h"
-#include "lttng-tracer.h"
-#include "lttng-tracer-core.h"
-#include "wait.h"
-#include "../libringbuffer/shm.h"
-#include "jhash.h"
-
-/*
- * The sessions mutex is the centralized mutex across UST tracing
- * control and probe registration. All operations within this file are
- * called by the communication thread, under ust_lock protection.
- */
-static pthread_mutex_t sessions_mutex = PTHREAD_MUTEX_INITIALIZER;
-
-void ust_lock(void)
-{
- pthread_mutex_lock(&sessions_mutex);
-}
-
-void ust_unlock(void)
-{
- pthread_mutex_unlock(&sessions_mutex);
-}
-
-static CDS_LIST_HEAD(sessions);
-
-static void _lttng_event_destroy(struct lttng_event *event);
-static int _lttng_event_unregister(struct lttng_event *event);
-static
-int _lttng_event_metadata_statedump(struct lttng_session *session,
- struct lttng_channel *chan,
- struct lttng_event *event);
-static
-int _lttng_session_metadata_statedump(struct lttng_session *session);
-
-static
-void lttng_session_lazy_sync_enablers(struct lttng_session *session);
-static
-void lttng_session_sync_enablers(struct lttng_session *session);
-static
-void lttng_enabler_destroy(struct lttng_enabler *enabler);
-
-/*
- * Called with ust lock held.
- */
-int lttng_session_active(void)
-{
- struct lttng_session *iter;
-
- cds_list_for_each_entry(iter, &sessions, node) {
- if (iter->active)
- return 1;
- }
- return 0;
-}
-
-static
-int lttng_loglevel_match(int loglevel,
- unsigned int has_loglevel,
- enum lttng_ust_loglevel_type req_type,
- int req_loglevel)
-{
- if (req_type == LTTNG_UST_LOGLEVEL_ALL)
- return 1;
- if (!has_loglevel)
- loglevel = TRACE_DEFAULT;
- switch (req_type) {
- case LTTNG_UST_LOGLEVEL_RANGE:
- if (loglevel <= req_loglevel || req_loglevel == -1)
- return 1;
- else
- return 0;
- case LTTNG_UST_LOGLEVEL_SINGLE:
- if (loglevel == req_loglevel || req_loglevel == -1)
- return 1;
- else
- return 0;
- case LTTNG_UST_LOGLEVEL_ALL:
- default:
- return 1;
- }
-}
-
-void synchronize_trace(void)
-{
- synchronize_rcu();
-}
-
-struct lttng_session *lttng_session_create(void)
-{
- struct lttng_session *session;
- int i;
-
- session = zmalloc(sizeof(struct lttng_session));
- if (!session)
- return NULL;
- CDS_INIT_LIST_HEAD(&session->chan_head);
- CDS_INIT_LIST_HEAD(&session->events_head);
- CDS_INIT_LIST_HEAD(&session->enablers_head);
- for (i = 0; i < LTTNG_UST_EVENT_HT_SIZE; i++)
- CDS_INIT_HLIST_HEAD(&session->events_ht.table[i]);
- cds_list_add(&session->node, &sessions);
- return session;
-}
-
-/*
- * Only used internally at session destruction.
- */
-static
-void _lttng_channel_unmap(struct lttng_channel *lttng_chan)
-{
- struct channel *chan;
- struct lttng_ust_shm_handle *handle;
-
- cds_list_del(<tng_chan->node);
- lttng_destroy_context(lttng_chan->ctx);
- chan = lttng_chan->chan;
- handle = lttng_chan->handle;
- /*
- * note: lttng_chan is private data contained within handle. It
- * will be freed along with the handle.
- */
- channel_destroy(chan, handle, 0);
-}
-
-void lttng_session_destroy(struct lttng_session *session)
-{
- struct lttng_channel *chan, *tmpchan;
- struct lttng_event *event, *tmpevent;
- struct lttng_enabler *enabler, *tmpenabler;
- int ret;
-
- CMM_ACCESS_ONCE(session->active) = 0;
- cds_list_for_each_entry(event, &session->events_head, node) {
- ret = _lttng_event_unregister(event);
- WARN_ON(ret);
- }
- synchronize_trace(); /* Wait for in-flight events to complete */
- cds_list_for_each_entry_safe(enabler, tmpenabler,
- &session->enablers_head, node)
- lttng_enabler_destroy(enabler);
- cds_list_for_each_entry_safe(event, tmpevent,
- &session->events_head, node)
- _lttng_event_destroy(event);
- cds_list_for_each_entry_safe(chan, tmpchan, &session->chan_head, node)
- _lttng_channel_unmap(chan);
- cds_list_del(&session->node);
- free(session);
-}
-
-int lttng_session_enable(struct lttng_session *session)
-{
- int ret = 0;
- struct lttng_channel *chan;
- int notify_socket;
-
- if (session->active) {
- ret = -EBUSY;
- goto end;
- }
-
- notify_socket = lttng_get_notify_socket(session->owner);
- if (notify_socket < 0)
- return notify_socket;
-
- /* We need to sync enablers with session before activation. */
- lttng_session_sync_enablers(session);
-
- /*
- * Snapshot the number of events per channel to know the type of header
- * we need to use.
- */
- cds_list_for_each_entry(chan, &session->chan_head, node) {
- const struct lttng_ctx *ctx;
- const struct lttng_event_field *fields = NULL;
- size_t nr_fields = 0;
-
- /* don't change it if session stop/restart */
- if (chan->header_type)
- continue;
- ctx = chan->ctx;
- if (ctx) {
- nr_fields = ctx->nr_fields;
- fields = &ctx->fields->event_field;
- }
- ret = ustcomm_register_channel(notify_socket,
- session->objd,
- chan->objd,
- nr_fields,
- fields,
- &chan->id,
- &chan->header_type);
- if (ret)
- return ret;
- }
-
- CMM_ACCESS_ONCE(session->active) = 1;
- CMM_ACCESS_ONCE(session->been_active) = 1;
- ret = _lttng_session_metadata_statedump(session);
- if (ret)
- CMM_ACCESS_ONCE(session->active) = 0;
-end:
- return ret;
-}
-
-int lttng_session_disable(struct lttng_session *session)
-{
- int ret = 0;
-
- if (!session->active) {
- ret = -EBUSY;
- goto end;
- }
- CMM_ACCESS_ONCE(session->active) = 0;
-end:
- return ret;
-}
-
-int lttng_channel_enable(struct lttng_channel *channel)
-{
- int old;
-
- if (channel == channel->session->metadata)
- return -EPERM;
- old = uatomic_xchg(&channel->enabled, 1);
- if (old)
- return -EEXIST;
- return 0;
-}
-
-int lttng_channel_disable(struct lttng_channel *channel)
-{
- int old;
-
- if (channel == channel->session->metadata)
- return -EPERM;
- old = uatomic_xchg(&channel->enabled, 0);
- if (!old)
- return -EEXIST;
- return 0;
-}
-
-int lttng_event_enable(struct lttng_event *event)
-{
- int old;
-
- if (event->chan == event->chan->session->metadata)
- return -EPERM;
- old = uatomic_xchg(&event->enabled, 1);
- if (old)
- return -EEXIST;
- return 0;
-}
-
-int lttng_event_disable(struct lttng_event *event)
-{
- int old;
-
- if (event->chan == event->chan->session->metadata)
- return -EPERM;
- old = uatomic_xchg(&event->enabled, 0);
- if (!old)
- return -EEXIST;
- return 0;
-}
-
-/*
- * Supports event creation while tracing session is active.
- */
-static
-int lttng_event_create(const struct lttng_event_desc *desc,
- struct lttng_channel *chan)
-{
- const char *event_name = desc->name;
- struct lttng_event *event;
- struct lttng_session *session = chan->session;
- struct cds_hlist_head *head;
- struct cds_hlist_node *node;
- int ret = 0;
- size_t name_len = strlen(event_name);
- uint32_t hash;
- int notify_socket, loglevel;
- const char *uri;
-
- hash = jhash(event_name, name_len, 0);
- head = &chan->session->events_ht.table[hash & (LTTNG_UST_EVENT_HT_SIZE - 1)];
- cds_hlist_for_each_entry(event, node, head, hlist) {
- assert(event->desc);
- if (!strncmp(event->desc->name,
- desc->name,
- LTTNG_UST_SYM_NAME_LEN - 1)) {
- ret = -EEXIST;
- goto exist;
- }
- }
-
- notify_socket = lttng_get_notify_socket(session->owner);
- if (notify_socket < 0) {
- ret = notify_socket;
- goto socket_error;
- }
-
- /*
- * Check if loglevel match. Refuse to connect event if not.
- */
- event = zmalloc(sizeof(struct lttng_event));
- if (!event) {
- ret = -ENOMEM;
- goto cache_error;
- }
- event->chan = chan;
-
- event->enabled = 1;
- CDS_INIT_LIST_HEAD(&event->bytecode_runtime_head);
- CDS_INIT_LIST_HEAD(&event->enablers_ref_head);
- event->desc = desc;
-
- if (desc->loglevel)
- loglevel = *(*event->desc->loglevel);
- else
- loglevel = TRACE_DEFAULT;
- if (desc->u.ext.model_emf_uri)
- uri = *(desc->u.ext.model_emf_uri);
- else
- uri = NULL;
-
- /* Fetch event ID from sessiond */
- ret = ustcomm_register_event(notify_socket,
- session->objd,
- chan->objd,
- event_name,
- loglevel,
- desc->signature,
- desc->nr_fields,
- desc->fields,
- uri,
- &event->id);
- if (ret < 0) {
- goto sessiond_register_error;
- }
- /* Populate lttng_event structure before tracepoint registration. */
- cmm_smp_wmb();
- ret = __tracepoint_probe_register(event_name,
- desc->probe_callback,
- event, desc->signature);
- if (ret)
- goto tracepoint_register_error;
-
- ret = _lttng_event_metadata_statedump(chan->session, chan, event);
- if (ret)
- goto statedump_error;
- cds_list_add(&event->node, &chan->session->events_head);
- cds_hlist_add_head(&event->hlist, head);
- return 0;
-
-statedump_error:
- WARN_ON_ONCE(__tracepoint_probe_unregister(event_name,
- desc->probe_callback,
- event));
-tracepoint_register_error:
-sessiond_register_error:
- free(event);
-cache_error:
-socket_error:
-exist:
- return ret;
-}
-
-static
-int lttng_desc_match_wildcard_enabler(const struct lttng_event_desc *desc,
- struct lttng_enabler *enabler)
-{
- int loglevel = 0;
- unsigned int has_loglevel;
-
- assert(enabler->type == LTTNG_ENABLER_WILDCARD);
- /* Compare excluding final '*' */
- if (strncmp(desc->name, enabler->event_param.name,
- strlen(enabler->event_param.name) - 1))
- return 0;
- if (desc->loglevel) {
- loglevel = *(*desc->loglevel);
- has_loglevel = 1;
- }
- if (!lttng_loglevel_match(loglevel,
- has_loglevel,
- enabler->event_param.loglevel_type,
- enabler->event_param.loglevel))
- return 0;
- return 1;
-}
-
-static
-int lttng_desc_match_event_enabler(const struct lttng_event_desc *desc,
- struct lttng_enabler *enabler)
-{
- int loglevel = 0;
- unsigned int has_loglevel = 0;
-
- assert(enabler->type == LTTNG_ENABLER_EVENT);
- if (strcmp(desc->name, enabler->event_param.name))
- return 0;
- if (desc->loglevel) {
- loglevel = *(*desc->loglevel);
- has_loglevel = 1;
- }
- if (!lttng_loglevel_match(loglevel,
- has_loglevel,
- enabler->event_param.loglevel_type,
- enabler->event_param.loglevel))
- return 0;
- return 1;
-}
-
-static
-int lttng_desc_match_enabler(const struct lttng_event_desc *desc,
- struct lttng_enabler *enabler)
-{
- switch (enabler->type) {
- case LTTNG_ENABLER_WILDCARD:
- return lttng_desc_match_wildcard_enabler(desc, enabler);
- case LTTNG_ENABLER_EVENT:
- return lttng_desc_match_event_enabler(desc, enabler);
- default:
- return -EINVAL;
- }
-}
-
-static
-int lttng_event_match_enabler(struct lttng_event *event,
- struct lttng_enabler *enabler)
-{
- return lttng_desc_match_enabler(event->desc, enabler);
-}
-
-static
-struct lttng_enabler_ref * lttng_event_enabler_ref(struct lttng_event *event,
- struct lttng_enabler *enabler)
-{
- struct lttng_enabler_ref *enabler_ref;
-
- cds_list_for_each_entry(enabler_ref,
- &event->enablers_ref_head, node) {
- if (enabler_ref->ref == enabler)
- return enabler_ref;
- }
- return NULL;
-}
-
-/*
- * Create struct lttng_event if it is missing and present in the list of
- * tracepoint probes.
- */
-static
-void lttng_create_event_if_missing(struct lttng_enabler *enabler)
-{
- struct lttng_session *session = enabler->chan->session;
- struct lttng_probe_desc *probe_desc;
- const struct lttng_event_desc *desc;
- struct lttng_event *event;
- int i;
- struct cds_list_head *probe_list;
-
- probe_list = lttng_get_probe_list_head();
- /*
- * For each probe event, if we find that a probe event matches
- * our enabler, create an associated lttng_event if not
- * already present.
- */
- cds_list_for_each_entry(probe_desc, probe_list, head) {
- for (i = 0; i < probe_desc->nr_events; i++) {
- int found = 0, ret;
- struct cds_hlist_head *head;
- struct cds_hlist_node *node;
- const char *event_name;
- size_t name_len;
- uint32_t hash;
-
- desc = probe_desc->event_desc[i];
- if (!lttng_desc_match_enabler(desc, enabler))
- continue;
- event_name = desc->name;
- name_len = strlen(event_name);
-
- /*
- * Check if already created.
- */
- hash = jhash(event_name, name_len, 0);
- head = &session->events_ht.table[hash & (LTTNG_UST_EVENT_HT_SIZE - 1)];
- cds_hlist_for_each_entry(event, node, head, hlist) {
- if (event->desc == desc)
- found = 1;
- }
- if (found)
- continue;
-
- /*
- * We need to create an event for this
- * event probe.
- */
- ret = lttng_event_create(probe_desc->event_desc[i],
- enabler->chan);
- if (ret) {
- DBG("Unable to create event %s, error %d\n",
- probe_desc->event_desc[i]->name, ret);
- }
- }
- }
-}
-
-/*
- * Create events associated with an enabler (if not already present),
- * and add backward reference from the event to the enabler.
- */
-static
-int lttng_enabler_ref_events(struct lttng_enabler *enabler)
-{
- struct lttng_session *session = enabler->chan->session;
- struct lttng_event *event;
-
- /* First ensure that probe events are created for this enabler. */
- lttng_create_event_if_missing(enabler);
-
- /* For each event matching enabler in session event list. */
- cds_list_for_each_entry(event, &session->events_head, node) {
- struct lttng_enabler_ref *enabler_ref;
-
- if (!lttng_event_match_enabler(event, enabler))
- continue;
-
- enabler_ref = lttng_event_enabler_ref(event, enabler);
- if (!enabler_ref) {
- /*
- * If no backward ref, create it.
- * Add backward ref from event to enabler.
- */
- enabler_ref = zmalloc(sizeof(*enabler_ref));
- if (!enabler_ref)
- return -ENOMEM;
- enabler_ref->ref = enabler;
- cds_list_add(&enabler_ref->node,
- &event->enablers_ref_head);
- }
-
- /*
- * Link filter bytecodes if not linked yet.
- */
- lttng_enabler_event_link_bytecode(event, enabler);
-
- /* TODO: merge event context. */
- }
- return 0;
-}
-
-/*
- * Called at library load: connect the probe on all enablers matching
- * this event.
- * called with session mutex held.
- * TODO: currently, for each desc added, we iterate on all event desc
- * (inefficient). We should create specific code that only target the
- * added desc.
- */
-int lttng_fix_pending_event_desc(const struct lttng_event_desc *desc)
-{
- struct lttng_session *session;
-
- cds_list_for_each_entry(session, &sessions, node) {
- lttng_session_lazy_sync_enablers(session);
- }
- return 0;
-}
-
-/*
- * Only used internally at session destruction.
- */
-int _lttng_event_unregister(struct lttng_event *event)
-{
- return __tracepoint_probe_unregister(event->desc->name,
- event->desc->probe_callback,
- event);
-}
-
-/*
- * Only used internally at session destruction.
- */
-static
-void _lttng_event_destroy(struct lttng_event *event)
-{
- struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref;
-
- cds_list_del(&event->node);
- lttng_destroy_context(event->ctx);
- lttng_free_event_filter_runtime(event);
- /* Free event enabler refs */
- cds_list_for_each_entry_safe(enabler_ref, tmp_enabler_ref,
- &event->enablers_ref_head, node)
- free(enabler_ref);
- free(event);
-}
-
-/*
- * We have exclusive access to our metadata buffer (protected by the
- * ust_lock), so we can do racy operations such as looking for
- * remaining space left in packet and write, since mutual exclusion
- * protects us from concurrent writes.
- */
-int lttng_metadata_printf(struct lttng_session *session,
- const char *fmt, ...)
-{
- struct lttng_ust_lib_ring_buffer_ctx ctx;
- struct lttng_channel *chan = session->metadata;
- char *str = NULL;
- int ret = 0, waitret;
- size_t len, reserve_len, pos;
- va_list ap;
-
- WARN_ON_ONCE(!CMM_ACCESS_ONCE(session->active));
-
- va_start(ap, fmt);
- ret = vasprintf(&str, fmt, ap);
- va_end(ap);
- if (ret < 0)
- return -ENOMEM;
-
- len = strlen(str);
- pos = 0;
-
- for (pos = 0; pos < len; pos += reserve_len) {
- reserve_len = min_t(size_t,
- chan->ops->packet_avail_size(chan->chan, chan->handle),
- len - pos);
- lib_ring_buffer_ctx_init(&ctx, chan->chan, NULL, reserve_len,
- sizeof(char), -1, chan->handle);
- /*
- * We don't care about metadata buffer's records lost
- * count, because we always retry here. Report error if
- * we need to bail out after timeout or being
- * interrupted.
- */
- waitret = wait_cond_interruptible_timeout(
- ({
- ret = chan->ops->event_reserve(&ctx, 0);
- ret != -ENOBUFS || !ret;
- }),
- LTTNG_METADATA_TIMEOUT_MSEC);
- if (waitret == -ETIMEDOUT || waitret == -EINTR || ret) {
- DBG("LTTng: Failure to write metadata to buffers (%s)\n",
- waitret == -EINTR ? "interrupted" :
- (ret == -ENOBUFS ? "timeout" : "I/O error"));
- if (waitret == -EINTR)
- ret = waitret;
- goto end;
- }
- chan->ops->event_write(&ctx, &str[pos], reserve_len);
- chan->ops->event_commit(&ctx);
- }
-end:
- free(str);
- return ret;
-}
-
-static
-int _lttng_field_statedump(struct lttng_session *session,
- const struct lttng_event_field *field)
-{
- int ret = 0;
-
- if (field->nowrite)
- return 0;
-
- switch (field->type.atype) {
- case atype_integer:
- ret = lttng_metadata_printf(session,
- " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s;\n",
- field->type.u.basic.integer.size,
- field->type.u.basic.integer.alignment,
- field->type.u.basic.integer.signedness,
- (field->type.u.basic.integer.encoding == lttng_encode_none)
- ? "none"
- : (field->type.u.basic.integer.encoding == lttng_encode_UTF8)
- ? "UTF8"
- : "ASCII",
- field->type.u.basic.integer.base,
-#if (BYTE_ORDER == BIG_ENDIAN)
- field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "",
-#else
- field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "",
-#endif
- field->name);
- break;
- case atype_float:
- ret = lttng_metadata_printf(session,
- " floating_point { exp_dig = %u; mant_dig = %u; align = %u;%s } _%s;\n",
- field->type.u.basic._float.exp_dig,
- field->type.u.basic._float.mant_dig,
- field->type.u.basic._float.alignment,
-#if (BYTE_ORDER == BIG_ENDIAN)
- field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "",
-#else
- field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "",
-#endif
- field->name);
- break;
- case atype_enum:
- ret = lttng_metadata_printf(session,
- " %s %s;\n",
- field->type.u.basic.enumeration.name,
- field->name);
- break;
- case atype_array:
- {
- const struct lttng_basic_type *elem_type;
-
- elem_type = &field->type.u.array.elem_type;
- ret = lttng_metadata_printf(session,
- " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[%u];\n",
- elem_type->u.basic.integer.size,
- elem_type->u.basic.integer.alignment,
- elem_type->u.basic.integer.signedness,
- (elem_type->u.basic.integer.encoding == lttng_encode_none)
- ? "none"
- : (elem_type->u.basic.integer.encoding == lttng_encode_UTF8)
- ? "UTF8"
- : "ASCII",
- elem_type->u.basic.integer.base,
-#if (BYTE_ORDER == BIG_ENDIAN)
- elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "",
-#else
- elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "",
-#endif
- field->name, field->type.u.array.length);
- break;
- }
- case atype_sequence:
- {
- const struct lttng_basic_type *elem_type;
- const struct lttng_basic_type *length_type;
-
- elem_type = &field->type.u.sequence.elem_type;
- length_type = &field->type.u.sequence.length_type;
- ret = lttng_metadata_printf(session,
- " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } __%s_length;\n",
- length_type->u.basic.integer.size,
- (unsigned int) length_type->u.basic.integer.alignment,
- length_type->u.basic.integer.signedness,
- (length_type->u.basic.integer.encoding == lttng_encode_none)
- ? "none"
- : ((length_type->u.basic.integer.encoding == lttng_encode_UTF8)
- ? "UTF8"
- : "ASCII"),
- length_type->u.basic.integer.base,
-#if (BYTE_ORDER == BIG_ENDIAN)
- length_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "",
-#else
- length_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "",
-#endif
- field->name);
- if (ret)
- return ret;
-
- ret = lttng_metadata_printf(session,
- " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[ __%s_length ];\n",
- elem_type->u.basic.integer.size,
- (unsigned int) elem_type->u.basic.integer.alignment,
- elem_type->u.basic.integer.signedness,
- (elem_type->u.basic.integer.encoding == lttng_encode_none)
- ? "none"
- : ((elem_type->u.basic.integer.encoding == lttng_encode_UTF8)
- ? "UTF8"
- : "ASCII"),
- elem_type->u.basic.integer.base,
-#if (BYTE_ORDER == BIG_ENDIAN)
- elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "",
-#else
- elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "",
-#endif
- field->name,
- field->name);
- break;
- }
-
- case atype_string:
- /* Default encoding is UTF8 */
- ret = lttng_metadata_printf(session,
- " string%s _%s;\n",
- field->type.u.basic.string.encoding == lttng_encode_ASCII ?
- " { encoding = ASCII; }" : "",
- field->name);
- break;
- default:
- WARN_ON_ONCE(1);
- return -EINVAL;
- }
- return ret;
-}
-
-static
-int _lttng_context_metadata_statedump(struct lttng_session *session,
- struct lttng_ctx *ctx)
-{
- int ret = 0;
- int i;
-
- if (!ctx)
- return 0;
- for (i = 0; i < ctx->nr_fields; i++) {
- const struct lttng_ctx_field *field = &ctx->fields[i];
-
- ret = _lttng_field_statedump(session, &field->event_field);
- if (ret)
- return ret;
- }
- return ret;
-}
-
-static
-int _lttng_fields_metadata_statedump(struct lttng_session *session,
- struct lttng_event *event)
-{
- const struct lttng_event_desc *desc = event->desc;
- int ret = 0;
- int i;
-
- for (i = 0; i < desc->nr_fields; i++) {
- const struct lttng_event_field *field = &desc->fields[i];
-
- ret = _lttng_field_statedump(session, field);
- if (ret)
- return ret;
- }
- return ret;
-}
-
-static
-int _lttng_event_metadata_statedump(struct lttng_session *session,
- struct lttng_channel *chan,
- struct lttng_event *event)
-{
- int ret = 0;
- int loglevel = TRACE_DEFAULT;
-
- if (event->metadata_dumped || !CMM_ACCESS_ONCE(session->active))
- return 0;
- if (chan == session->metadata)
- return 0;
- /*
- * Don't print events for which probe load is pending.
- */
- if (!event->desc)
- return 0;
-
- ret = lttng_metadata_printf(session,
- "event {\n"
- " name = \"%s\";\n"
- " id = %u;\n"
- " stream_id = %u;\n",
- event->desc->name,
- event->id,
- event->chan->id);
- if (ret)
- goto end;
-
- if (event->desc->loglevel)
- loglevel = *(*event->desc->loglevel);
-
- ret = lttng_metadata_printf(session,
- " loglevel = %d;\n",
- loglevel);
- if (ret)
- goto end;
-
- if (event->desc->u.ext.model_emf_uri) {
- ret = lttng_metadata_printf(session,
- " model.emf.uri = \"%s\";\n",
- *(event->desc->u.ext.model_emf_uri));
- if (ret)
- goto end;
- }
-
- if (event->ctx) {
- ret = lttng_metadata_printf(session,
- " context := struct {\n");
- if (ret)
- goto end;
- }
- ret = _lttng_context_metadata_statedump(session, event->ctx);
- if (ret)
- goto end;
- if (event->ctx) {
- ret = lttng_metadata_printf(session,
- " };\n");
- if (ret)
- goto end;
- }
-
- ret = lttng_metadata_printf(session,
- " fields := struct {\n"
- );
- if (ret)
- goto end;
-
- ret = _lttng_fields_metadata_statedump(session, event);
- if (ret)
- goto end;
-
- /*
- * LTTng space reservation can only reserve multiples of the
- * byte size.
- */
- ret = lttng_metadata_printf(session,
- " };\n"
- "};\n\n");
- if (ret)
- goto end;
-
- event->metadata_dumped = 1;
-end:
- return ret;
-
-}
-
-static
-int _lttng_channel_metadata_statedump(struct lttng_session *session,
- struct lttng_channel *chan)
-{
- int ret = 0;
-
- if (chan->metadata_dumped || !CMM_ACCESS_ONCE(session->active))
- return 0;
- if (chan == session->metadata)
- return 0;
-
- WARN_ON_ONCE(!chan->header_type);
- ret = lttng_metadata_printf(session,
- "stream {\n"
- " id = %u;\n"
- " event.header := %s;\n"
- " packet.context := struct packet_context;\n",
- chan->id,
- chan->header_type == 1 ? "struct event_header_compact" :
- "struct event_header_large");
- if (ret)
- goto end;
-
- if (chan->ctx) {
- ret = lttng_metadata_printf(session,
- " event.context := struct {\n");
- if (ret)
- goto end;
- }
- ret = _lttng_context_metadata_statedump(session, chan->ctx);
- if (ret)
- goto end;
- if (chan->ctx) {
- ret = lttng_metadata_printf(session,
- " };\n");
- if (ret)
- goto end;
- }
-
- ret = lttng_metadata_printf(session,
- "};\n\n");
-
- chan->metadata_dumped = 1;
-end:
- return ret;
-}
-
-static
-int _lttng_stream_packet_context_declare(struct lttng_session *session)
-{
- return lttng_metadata_printf(session,
- "struct packet_context {\n"
- " uint64_clock_monotonic_t timestamp_begin;\n"
- " uint64_clock_monotonic_t timestamp_end;\n"
- " uint64_t content_size;\n"
- " uint64_t packet_size;\n"
- " unsigned long events_discarded;\n"
- " uint32_t cpu_id;\n"
- "};\n\n"
- );
-}
-
-/*
- * Compact header:
- * id: range: 0 - 30.
- * id 31 is reserved to indicate an extended header.
- *
- * Large header:
- * id: range: 0 - 65534.
- * id 65535 is reserved to indicate an extended header.
- */
-static
-int _lttng_event_header_declare(struct lttng_session *session)
-{
- return lttng_metadata_printf(session,
- "struct event_header_compact {\n"
- " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
- " variant <id> {\n"
- " struct {\n"
- " uint27_clock_monotonic_t timestamp;\n"
- " } compact;\n"
- " struct {\n"
- " uint32_t id;\n"
- " uint64_clock_monotonic_t timestamp;\n"
- " } extended;\n"
- " } v;\n"
- "} align(%u);\n"
- "\n"
- "struct event_header_large {\n"
- " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
- " variant <id> {\n"
- " struct {\n"
- " uint32_clock_monotonic_t timestamp;\n"
- " } compact;\n"
- " struct {\n"
- " uint32_t id;\n"
- " uint64_clock_monotonic_t timestamp;\n"
- " } extended;\n"
- " } v;\n"
- "} align(%u);\n\n",
- lttng_alignof(uint32_t) * CHAR_BIT,
- lttng_alignof(uint16_t) * CHAR_BIT
- );
-}
-
-/*
- * Approximation of NTP time of day to clock monotonic correlation,
- * taken at start of trace.
- * Yes, this is only an approximation. Yes, we can (and will) do better
- * in future versions.
- */
-static
-uint64_t measure_clock_offset(void)
-{
- uint64_t offset, monotonic[2], realtime;
- struct timespec rts = { 0, 0 };
- int ret;
-
- monotonic[0] = trace_clock_read64();
- ret = clock_gettime(CLOCK_REALTIME, &rts);
- if (ret < 0)
- return 0;
- monotonic[1] = trace_clock_read64();
- offset = (monotonic[0] + monotonic[1]) >> 1;
- realtime = (uint64_t) rts.tv_sec * 1000000000ULL;
- realtime += rts.tv_nsec;
- offset = realtime - offset;
- return offset;
-}
-
-/*
- * Output metadata into this session's metadata buffers.
- */
-static
-int _lttng_session_metadata_statedump(struct lttng_session *session)
-{
- unsigned char *uuid_c;
- char uuid_s[LTTNG_UST_UUID_STR_LEN],
- clock_uuid_s[LTTNG_UST_UUID_STR_LEN];
- struct lttng_channel *chan;
- struct lttng_event *event;
- int ret = 0;
- char procname[LTTNG_UST_PROCNAME_LEN] = "";
- char hostname[HOST_NAME_MAX];
-
- if (!CMM_ACCESS_ONCE(session->active))
- return 0;
- if (session->metadata_dumped)
- goto skip_session;
- if (!session->metadata) {
- DBG("LTTng: attempt to start tracing, but metadata channel is not found. Operation abort.\n");
- return -EPERM;
- }
- uuid_c = session->metadata->uuid;
-
- snprintf(uuid_s, sizeof(uuid_s),
- "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
- uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3],
- uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7],
- uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11],
- uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]);
-
- ret = lttng_metadata_printf(session,
- "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
- "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
- "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
- "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
- "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
- "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
- "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
- "\n"
- "trace {\n"
- " major = %u;\n"
- " minor = %u;\n"
- " uuid = \"%s\";\n"
- " byte_order = %s;\n"
- " packet.header := struct {\n"
- " uint32_t magic;\n"
- " uint8_t uuid[16];\n"
- " uint32_t stream_id;\n"
- " };\n"
- "};\n\n",
- lttng_alignof(uint8_t) * CHAR_BIT,
- lttng_alignof(uint16_t) * CHAR_BIT,
- lttng_alignof(uint32_t) * CHAR_BIT,
- lttng_alignof(uint64_t) * CHAR_BIT,
- sizeof(unsigned long) * CHAR_BIT,
- lttng_alignof(unsigned long) * CHAR_BIT,
- CTF_SPEC_MAJOR,
- CTF_SPEC_MINOR,
- uuid_s,
-#if (BYTE_ORDER == BIG_ENDIAN)
- "be"
-#else
- "le"
-#endif
- );
- if (ret)
- goto end;
-
- /* ignore error, just use empty string if error. */
- hostname[0] = '\0';
- ret = gethostname(hostname, sizeof(hostname));
- if (ret && errno == ENAMETOOLONG)
- hostname[HOST_NAME_MAX - 1] = '\0';
- lttng_ust_getprocname(procname);
- procname[LTTNG_UST_PROCNAME_LEN - 1] = '\0';
- ret = lttng_metadata_printf(session,
- "env {\n"
- " hostname = \"%s\";\n"
- " vpid = %d;\n"
- " procname = \"%s\";\n"
- " domain = \"ust\";\n"
- " tracer_name = \"lttng-ust\";\n"
- " tracer_major = %u;\n"
- " tracer_minor = %u;\n"
- " tracer_patchlevel = %u;\n"
- "};\n\n",
- hostname,
- (int) getpid(),
- procname,
- LTTNG_UST_MAJOR_VERSION,
- LTTNG_UST_MINOR_VERSION,
- LTTNG_UST_PATCHLEVEL_VERSION
- );
- if (ret)
- goto end;
-
- ret = lttng_metadata_printf(session,
- "clock {\n"
- " name = %s;\n",
- "monotonic"
- );
- if (ret)
- goto end;
-
- if (!trace_clock_uuid(clock_uuid_s)) {
- ret = lttng_metadata_printf(session,
- " uuid = \"%s\";\n",
- clock_uuid_s
- );
- if (ret)
- goto end;
- }
-
- ret = lttng_metadata_printf(session,
- " description = \"Monotonic Clock\";\n"
- " freq = %" PRIu64 "; /* Frequency, in Hz */\n"
- " /* clock value offset from Epoch is: offset * (1/freq) */\n"
- " offset = %" PRIu64 ";\n"
- "};\n\n",
- trace_clock_freq(),
- measure_clock_offset()
- );
- if (ret)
- goto end;
-
- ret = lttng_metadata_printf(session,
- "typealias integer {\n"
- " size = 27; align = 1; signed = false;\n"
- " map = clock.monotonic.value;\n"
- "} := uint27_clock_monotonic_t;\n"
- "\n"
- "typealias integer {\n"
- " size = 32; align = %u; signed = false;\n"
- " map = clock.monotonic.value;\n"
- "} := uint32_clock_monotonic_t;\n"
- "\n"
- "typealias integer {\n"
- " size = 64; align = %u; signed = false;\n"
- " map = clock.monotonic.value;\n"
- "} := uint64_clock_monotonic_t;\n\n",
- lttng_alignof(uint32_t) * CHAR_BIT,
- lttng_alignof(uint64_t) * CHAR_BIT
- );
- if (ret)
- goto end;
-
- ret = _lttng_stream_packet_context_declare(session);
- if (ret)
- goto end;
-
- ret = _lttng_event_header_declare(session);
- if (ret)
- goto end;
-
-skip_session:
- cds_list_for_each_entry(chan, &session->chan_head, node) {
- ret = _lttng_channel_metadata_statedump(session, chan);
- if (ret)
- goto end;
- }
-
- cds_list_for_each_entry(event, &session->events_head, node) {
- ret = _lttng_event_metadata_statedump(session, event->chan, event);
- if (ret)
- goto end;
- }
- session->metadata_dumped = 1;
-end:
- return ret;
-}
-
-void lttng_ust_events_exit(void)
-{
- struct lttng_session *session, *tmpsession;
-
- cds_list_for_each_entry_safe(session, tmpsession, &sessions, node)
- lttng_session_destroy(session);
-}
-
-/*
- * Enabler management.
- */
-struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type,
- struct lttng_ust_event *event_param,
- struct lttng_channel *chan)
-{
- struct lttng_enabler *enabler;
-
- enabler = zmalloc(sizeof(*enabler));
- if (!enabler)
- return NULL;
- enabler->type = type;
- CDS_INIT_LIST_HEAD(&enabler->filter_bytecode_head);
- memcpy(&enabler->event_param, event_param,
- sizeof(enabler->event_param));
- enabler->chan = chan;
- /* ctx left NULL */
- enabler->enabled = 1;
- cds_list_add(&enabler->node, &enabler->chan->session->enablers_head);
- lttng_session_lazy_sync_enablers(enabler->chan->session);
- return enabler;
-}
-
-int lttng_enabler_enable(struct lttng_enabler *enabler)
-{
- enabler->enabled = 1;
- lttng_session_lazy_sync_enablers(enabler->chan->session);
- return 0;
-}
-
-int lttng_enabler_disable(struct lttng_enabler *enabler)
-{
- if (enabler->chan == enabler->chan->session->metadata)
- return -EPERM;
- enabler->enabled = 0;
- lttng_session_lazy_sync_enablers(enabler->chan->session);
- return 0;
-}
-
-int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler,
- struct lttng_ust_filter_bytecode_node *bytecode)
-{
- bytecode->enabler = enabler;
- cds_list_add_tail(&bytecode->node, &enabler->filter_bytecode_head);
- lttng_session_lazy_sync_enablers(enabler->chan->session);
- return 0;
-}
-
-int lttng_attach_context(struct lttng_ust_context *context_param,
- struct lttng_ctx **ctx, struct lttng_session *session)
-{
- /*
- * We cannot attach a context after trace has been started for a
- * session because the metadata does not allow expressing this
- * information outside of the original channel scope.
- */
- if (session->been_active)
- return -EPERM;
-
- switch (context_param->ctx) {
- case LTTNG_UST_CONTEXT_PTHREAD_ID:
- return lttng_add_pthread_id_to_ctx(ctx);
- case LTTNG_UST_CONTEXT_VTID:
- return lttng_add_vtid_to_ctx(ctx);
- case LTTNG_UST_CONTEXT_VPID:
- return lttng_add_vpid_to_ctx(ctx);
- case LTTNG_UST_CONTEXT_PROCNAME:
- return lttng_add_procname_to_ctx(ctx);
- default:
- return -EINVAL;
- }
-}
-
-int lttng_enabler_attach_context(struct lttng_enabler *enabler,
- struct lttng_ust_context *context_param)
-{
-#if 0 // disabled for now.
- struct lttng_session *session = enabler->chan->session;
- int ret;
-
- ret = lttng_attach_context(context_param, &enabler->ctx,
- session);
- if (ret)
- return ret;
- lttng_session_lazy_sync_enablers(enabler->chan->session);
-#endif
- return -ENOSYS;
-}
-
-static
-void lttng_enabler_destroy(struct lttng_enabler *enabler)
-{
- struct lttng_ust_filter_bytecode_node *filter_node, *tmp_filter_node;
-
- /* Destroy filter bytecode */
- cds_list_for_each_entry_safe(filter_node, tmp_filter_node,
- &enabler->filter_bytecode_head, node) {
- free(filter_node);
- }
-
- /* Destroy contexts */
- lttng_destroy_context(enabler->ctx);
-
- cds_list_del(&enabler->node);
- free(enabler);
-}
-
-/*
- * lttng_session_sync_enablers should be called just before starting a
- * session.
- */
-static
-void lttng_session_sync_enablers(struct lttng_session *session)
-{
- struct lttng_enabler *enabler;
- struct lttng_event *event;
-
- cds_list_for_each_entry(enabler, &session->enablers_head, node)
- lttng_enabler_ref_events(enabler);
- /*
- * For each event, if at least one of its enablers is enabled,
- * we enable the event, else we disable it.
- */
- cds_list_for_each_entry(event, &session->events_head, node) {
- struct lttng_enabler_ref *enabler_ref;
- struct lttng_bytecode_runtime *runtime;
- int enabled = 0, has_enablers_without_bytecode = 0;
-
- /* Enable events */
- cds_list_for_each_entry(enabler_ref,
- &event->enablers_ref_head, node) {
- if (enabler_ref->ref->enabled) {
- enabled = 1;
- break;
- }
- }
- event->enabled = enabled;
-
- /* Check if has enablers without bytecode enabled */
- cds_list_for_each_entry(enabler_ref,
- &event->enablers_ref_head, node) {
- if (enabler_ref->ref->enabled
- && cds_list_empty(&enabler_ref->ref->filter_bytecode_head)) {
- has_enablers_without_bytecode = 1;
- break;
- }
- }
- event->has_enablers_without_bytecode =
- has_enablers_without_bytecode;
-
- /* Enable filters */
- cds_list_for_each_entry(runtime,
- &event->bytecode_runtime_head, node) {
- lttng_filter_sync_state(runtime);
- }
- }
-}
-
-/*
- * Apply enablers to session events, adding events to session if need
- * be. It is required after each modification applied to an active
- * session, and right before session "start".
- * "lazy" sync means we only sync if required.
- */
-static
-void lttng_session_lazy_sync_enablers(struct lttng_session *session)
-{
- /* We can skip if session is not active */
- if (!session->active)
- return;
- lttng_session_sync_enablers(session);
-}
projects / lttng-ust.git / blobdiff