-/*
- * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; only version 2 of the License.
- *
- * This program 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 General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along with
- * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
- * Place - Suite 330, Boston, MA 02111-1307, USA.
- */
-
-#define _GNU_SOURCE
-#include <errno.h>
-#include <urcu/list.h>
-#include <string.h>
-
-#include <lttng/lttng.h>
-#include <lttng-ht.h>
-#include <lttng-sessiond-comm.h>
-#include <lttngerr.h>
-
-#include "channel.h"
-#include "event.h"
-#include "kernel.h"
-#include "ust-ctl.h"
-#include "ust-app.h"
-#include "trace-kernel.h"
-#include "trace-ust.h"
-
-/*
- * Setup a lttng_event used to enable *all* syscall tracing.
- */
-static void init_syscalls_kernel_event(struct lttng_event *event)
-{
- event->name[0] = '\0';
- /*
- * We use LTTNG_EVENT* here since the trace kernel creation will make the
- * right changes for the kernel.
- */
- event->type = LTTNG_EVENT_SYSCALL;
-}
-
-/*
- * Disable kernel tracepoint event for a channel from the kernel session.
- */
-int event_kernel_disable_tracepoint(struct ltt_kernel_session *ksession,
- struct ltt_kernel_channel *kchan, char *event_name)
-{
- int ret;
- struct ltt_kernel_event *kevent;
-
- kevent = trace_kernel_get_event_by_name(event_name, kchan);
- if (kevent == NULL) {
- ret = LTTCOMM_NO_EVENT;
- goto error;
- }
-
- ret = kernel_disable_event(kevent);
- if (ret < 0) {
- ret = LTTCOMM_KERN_DISABLE_FAIL;
- goto error;
- }
-
- DBG("Kernel event %s disable for channel %s.",
- kevent->event->name, kchan->channel->name);
-
- ret = LTTCOMM_OK;
-
-error:
- return ret;
-}
-
-/*
- * Disable kernel tracepoint events for a channel from the kernel session.
- */
-int event_kernel_disable_all_tracepoints(struct ltt_kernel_session *ksession,
- struct ltt_kernel_channel *kchan)
-{
- int ret;
- struct ltt_kernel_event *kevent;
-
- /* For each event in the kernel session */
- cds_list_for_each_entry(kevent, &kchan->events_list.head, list) {
- ret = kernel_disable_event(kevent);
- if (ret < 0) {
- /* We continue disabling the rest */
- continue;
- }
- }
- ret = LTTCOMM_OK;
- return ret;
-}
-
-/*
- * Disable kernel syscall events for a channel from the kernel session.
- */
-int event_kernel_disable_all_syscalls(struct ltt_kernel_session *ksession,
- struct ltt_kernel_channel *kchan)
-{
- ERR("Cannot disable syscall tracing for existing session. Please destroy session instead.");
- return LTTCOMM_OK; /* Return OK so disable all succeeds */
-}
-
-/*
- * Disable all kernel event for a channel from the kernel session.
- */
-int event_kernel_disable_all(struct ltt_kernel_session *ksession,
- struct ltt_kernel_channel *kchan)
-{
- int ret;
-
- ret = event_kernel_disable_all_tracepoints(ksession, kchan);
- if (ret != LTTCOMM_OK)
- return ret;
- ret = event_kernel_disable_all_syscalls(ksession, kchan);
- return ret;
-}
-
-/*
- * Enable kernel tracepoint event for a channel from the kernel session.
- */
-int event_kernel_enable_tracepoint(struct ltt_kernel_session *ksession,
- struct ltt_kernel_channel *kchan, struct lttng_event *event)
-{
- int ret;
- struct ltt_kernel_event *kevent;
-
- kevent = trace_kernel_get_event_by_name(event->name, kchan);
- if (kevent == NULL) {
- ret = kernel_create_event(event, kchan);
- if (ret < 0) {
- if (ret == -EEXIST) {
- ret = LTTCOMM_KERN_EVENT_EXIST;
- } else {
- ret = LTTCOMM_KERN_ENABLE_FAIL;
- }
- goto end;
- }
- } else if (kevent->enabled == 0) {
- ret = kernel_enable_event(kevent);
- if (ret < 0) {
- ret = LTTCOMM_KERN_ENABLE_FAIL;
- goto end;
- }
- }
- ret = LTTCOMM_OK;
-end:
- return ret;
-}
-
-/*
- * Enable all kernel tracepoint events of a channel of the kernel session.
- */
-int event_kernel_enable_all_tracepoints(struct ltt_kernel_session *ksession,
- struct ltt_kernel_channel *kchan, int kernel_tracer_fd)
-{
- int size, i, ret;
- struct ltt_kernel_event *kevent;
- struct lttng_event *event_list = NULL;
-
- /* For each event in the kernel session */
- cds_list_for_each_entry(kevent, &kchan->events_list.head, list) {
- if (kevent->enabled == 0) {
- ret = kernel_enable_event(kevent);
- if (ret < 0) {
- /* Enable failed but still continue */
- continue;
- }
- }
- }
-
- size = kernel_list_events(kernel_tracer_fd, &event_list);
- if (size < 0) {
- ret = LTTCOMM_KERN_LIST_FAIL;
- goto end;
- }
-
- for (i = 0; i < size; i++) {
- kevent = trace_kernel_get_event_by_name(event_list[i].name, kchan);
- if (kevent == NULL) {
- /* Default event type for enable all */
- event_list[i].type = LTTNG_EVENT_TRACEPOINT;
- /* Enable each single tracepoint event */
- ret = kernel_create_event(&event_list[i], kchan);
- if (ret < 0) {
- /* Ignore error here and continue */
- }
- }
- }
- free(event_list);
-
- ret = LTTCOMM_OK;
-end:
- return ret;
-
-}
-
-/*
- * Enable all kernel tracepoint events of a channel of the kernel session.
- */
-int event_kernel_enable_all_syscalls(struct ltt_kernel_session *ksession,
- struct ltt_kernel_channel *kchan, int kernel_tracer_fd)
-{
- int ret;
- struct lttng_event event;
-
- init_syscalls_kernel_event(&event);
-
- DBG("Enabling all syscall tracing");
-
- ret = kernel_create_event(&event, kchan);
- if (ret < 0) {
- if (ret == -EEXIST) {
- ret = LTTCOMM_KERN_EVENT_EXIST;
- } else {
- ret = LTTCOMM_KERN_ENABLE_FAIL;
- }
- goto end;
- }
-
- ret = LTTCOMM_OK;
-end:
- return ret;
-}
-
-/*
- * Enable all kernel events of a channel of the kernel session.
- */
-int event_kernel_enable_all(struct ltt_kernel_session *ksession,
- struct ltt_kernel_channel *kchan, int kernel_tracer_fd)
-{
- int ret;
-
- ret = event_kernel_enable_all_tracepoints(ksession, kchan, kernel_tracer_fd);
- if (ret != LTTCOMM_OK) {
- goto end;
- }
- ret = event_kernel_enable_all_syscalls(ksession, kchan, kernel_tracer_fd);
-end:
- return ret;
-}
-
-/*
- * ============================
- * UST : The Ultimate Frontier!
- * ============================
- */
-
-/*
- * Enable all UST tracepoints for a channel from a UST session.
- */
-int event_ust_enable_all_tracepoints(struct ltt_ust_session *usess, int domain,
- struct ltt_ust_channel *uchan)
-{
- int ret, i;
- size_t size;
- struct lttng_ht_iter iter;
- struct ltt_ust_event *uevent = NULL;
- struct lttng_event *events = NULL;
-
- switch (domain) {
- case LTTNG_DOMAIN_UST:
- {
- /* Enable existing events */
- cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent,
- node.node) {
- if (uevent->enabled == 0) {
- ret = ust_app_enable_event_glb(usess, uchan, uevent);
- if (ret < 0) {
- continue;
- }
- uevent->enabled = 1;
- }
- }
-
- /* Get all UST available events */
- size = ust_app_list_events(&events);
- if (size < 0) {
- ret = LTTCOMM_UST_LIST_FAIL;
- goto error;
- }
-
- for (i = 0; i < size; i++) {
- /*
- * Check if event exist and if so, continue since it was enable
- * previously.
- */
- uevent = trace_ust_find_event_by_name(uchan->events,
- events[i].name);
- if (uevent != NULL) {
- ret = ust_app_enable_event_pid(usess, uchan, uevent,
- events[i].pid);
- if (ret < 0) {
- if (ret != -EEXIST) {
- ret = LTTCOMM_UST_ENABLE_FAIL;
- goto error;
- }
- }
- continue;
- }
-
- /* Create ust event */
- uevent = trace_ust_create_event(&events[i]);
- if (uevent == NULL) {
- ret = LTTCOMM_FATAL;
- goto error_destroy;
- }
-
- /* Create event for the specific PID */
- ret = ust_app_enable_event_pid(usess, uchan, uevent,
- events[i].pid);
- if (ret < 0) {
- if (ret == -EEXIST) {
- ret = LTTCOMM_UST_EVENT_EXIST;
- goto error;
- } else {
- ret = LTTCOMM_UST_ENABLE_FAIL;
- goto error_destroy;
- }
- }
-
- uevent->enabled = 1;
- /* Add ltt ust event to channel */
- rcu_read_lock();
- lttng_ht_add_unique_str(uchan->events, &uevent->node);
- rcu_read_unlock();
- }
-
- free(events);
- break;
- }
- case LTTNG_DOMAIN_UST_EXEC_NAME:
- case LTTNG_DOMAIN_UST_PID:
- case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
- default:
- ret = LTTCOMM_NOT_IMPLEMENTED;
- goto error;
- }
-
- return LTTCOMM_OK;
-
-error_destroy:
- trace_ust_destroy_event(uevent);
-
-error:
- free(events);
- return ret;
-}
-
-/*
- * Enable UST tracepoint event for a channel from a UST session.
- */
-int event_ust_enable_tracepoint(struct ltt_ust_session *usess, int domain,
- struct ltt_ust_channel *uchan, struct lttng_event *event)
-{
- int ret = LTTCOMM_OK, to_create = 0;
- struct ltt_ust_event *uevent;
-
- uevent = trace_ust_find_event_by_name(uchan->events, event->name);
- if (uevent == NULL) {
- uevent = trace_ust_create_event(event);
- if (uevent == NULL) {
- ret = LTTCOMM_FATAL;
- goto error;
- }
- /* Valid to set it after the goto error since uevent is still NULL */
- to_create = 1;
- }
-
- if (uevent->enabled) {
- /* It's already enabled so everything is OK */
- goto end;
- }
-
- uevent->enabled = 1;
-
- switch (domain) {
- case LTTNG_DOMAIN_UST:
- {
- if (to_create) {
- /* Create event on all UST registered apps for session */
- ret = ust_app_create_event_glb(usess, uchan, uevent);
- } else {
- /* Enable event on all UST registered apps for session */
- ret = ust_app_enable_event_glb(usess, uchan, uevent);
- }
-
- if (ret < 0) {
- if (ret == -EEXIST) {
- ret = LTTCOMM_UST_EVENT_EXIST;
- goto end;
- } else {
- ret = LTTCOMM_UST_ENABLE_FAIL;
- goto error;
- }
- }
- break;
- }
- case LTTNG_DOMAIN_UST_EXEC_NAME:
- case LTTNG_DOMAIN_UST_PID:
- case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
- default:
- ret = LTTCOMM_NOT_IMPLEMENTED;
- goto end;
- }
-
- if (to_create) {
- rcu_read_lock();
- /* Add ltt ust event to channel */
- lttng_ht_add_unique_str(uchan->events, &uevent->node);
- rcu_read_unlock();
- }
-
- DBG("Event UST %s %s in channel %s", uevent->attr.name,
- to_create ? "created" : "enabled", uchan->name);
-
- ret = LTTCOMM_OK;
-
-end:
- return ret;
-
-error:
- /*
- * Only destroy event on creation time (not enabling time) because if the
- * event is found in the channel (to_create == 0), it means that at some
- * point the enable_event worked and it's thus valid to keep it alive.
- * Destroying it also implies that we also destroy it's shadow copy to sync
- * everyone up.
- */
- if (to_create) {
- /* In this code path, the uevent was not added to the hash table */
- trace_ust_destroy_event(uevent);
- }
- return ret;
-}
-
-/*
- * Disable UST tracepoint of a channel from a UST session.
- */
-int event_ust_disable_tracepoint(struct ltt_ust_session *usess, int domain,
- struct ltt_ust_channel *uchan, char *event_name)
-{
- int ret;
- struct ltt_ust_event *uevent;
-
- uevent = trace_ust_find_event_by_name(uchan->events, event_name);
- if (uevent == NULL) {
- ret = LTTCOMM_UST_EVENT_NOT_FOUND;
- goto error;
- }
-
- if (uevent->enabled == 0) {
- /* It's already enabled so everything is OK */
- ret = LTTCOMM_OK;
- goto end;
- }
-
- switch (domain) {
- case LTTNG_DOMAIN_UST:
- ret = ust_app_disable_event_glb(usess, uchan, uevent);
- if (ret < 0 && ret != -EEXIST) {
- ret = LTTCOMM_UST_DISABLE_FAIL;
- goto error;
- }
- break;
- case LTTNG_DOMAIN_UST_EXEC_NAME:
- case LTTNG_DOMAIN_UST_PID:
- case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
- default:
- ret = LTTCOMM_NOT_IMPLEMENTED;
- goto error;
- }
-
- uevent->enabled = 0;
- ret = LTTCOMM_OK;
-
-end:
- DBG2("Event UST %s disabled in channel %s", uevent->attr.name,
- uchan->name);
-
-error:
- return ret;
-}
-
-/*
- * Disable all UST tracepoints for a channel from a UST session.
- */
-int event_ust_disable_all_tracepoints(struct ltt_ust_session *usess, int domain,
- struct ltt_ust_channel *uchan)
-{
- int ret, i;
- size_t size;
- struct lttng_ht_iter iter;
- struct ltt_ust_event *uevent = NULL;
- struct lttng_event *events = NULL;
-
- switch (domain) {
- case LTTNG_DOMAIN_UST:
- {
- /* Disabling existing events */
- cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent,
- node.node) {
- if (uevent->enabled == 1) {
- ret = ust_app_disable_event_glb(usess, uchan, uevent);
- if (ret < 0) {
- continue;
- }
- uevent->enabled = 0;
- }
- }
-
- /* Get all UST available events */
- size = ust_app_list_events(&events);
- if (size < 0) {
- ret = LTTCOMM_UST_LIST_FAIL;
- goto error;
- }
-
- for (i = 0; i < size; i++) {
- uevent = trace_ust_find_event_by_name(uchan->events,
- events[i].name);
- if (uevent != NULL && uevent->enabled == 1) {
- ret = ust_app_disable_event_pid(usess, uchan, uevent,
- events[i].pid);
- if (ret < 0 && ret != -EEXIST) {
- ret = LTTCOMM_UST_DISABLE_FAIL;
- goto error;
- }
- uevent->enabled = 0;
- continue;
- }
- }
-
- free(events);
- break;
- }
- case LTTNG_DOMAIN_UST_EXEC_NAME:
- case LTTNG_DOMAIN_UST_PID:
- case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
- default:
- ret = LTTCOMM_NOT_IMPLEMENTED;
- goto error;
- }
-
- return LTTCOMM_OK;
-
-error:
- free(events);
- return ret;
-}
projects / lttng-tools.git / blobdiff