/*
* 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 free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2 only,
+ * as published by the Free Software Foundation.
*
* 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.
+ * 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#define _GNU_SOURCE
#include <sys/types.h>
#include <unistd.h>
#include <urcu/compiler.h>
+#include <lttng/ust-error.h>
#include <common/common.h>
+#include <common/sessiond-comm/sessiond-comm.h>
+#include "fd-limit.h"
+#include "health.h"
#include "ust-app.h"
#include "ust-consumer.h"
#include "ust-ctl.h"
+/* Next available channel key. */
+static unsigned long next_channel_key;
+
+/*
+ * Return the atomically incremented value of next_channel_key.
+ */
+static inline unsigned long get_next_channel_key(void)
+{
+ return uatomic_add_return(&next_channel_key, 1);
+}
+
+/*
+ * Return the consumer socket from the given consumer output with the right
+ * bitness. On error, returns NULL.
+ *
+ * The caller MUST acquire a rcu read side lock and keep it until the socket
+ * object reference is not needed anymore.
+ */
+static struct consumer_socket *find_consumer_socket_by_bitness(int bits,
+ struct consumer_output *consumer)
+{
+ int consumer_fd;
+ struct consumer_socket *socket = NULL;
+
+ switch (bits) {
+ case 64:
+ consumer_fd = uatomic_read(&ust_consumerd64_fd);
+ break;
+ case 32:
+ consumer_fd = uatomic_read(&ust_consumerd32_fd);
+ break;
+ default:
+ assert(0);
+ goto end;
+ }
+
+ socket = consumer_find_socket(consumer_fd, consumer);
+
+end:
+ return socket;
+}
+
+/*
+ * Match function for the hash table lookup.
+ *
+ * It matches an ust app event based on three attributes which are the event
+ * name, the filter bytecode and the loglevel.
+ */
+static int ht_match_ust_app_event(struct cds_lfht_node *node, const void *_key)
+{
+ struct ust_app_event *event;
+ const struct ust_app_ht_key *key;
+
+ assert(node);
+ assert(_key);
+
+ event = caa_container_of(node, struct ust_app_event, node.node);
+ key = _key;
+
+ /* Match the 3 elements of the key: name, filter and loglevel. */
+
+ /* Event name */
+ if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) {
+ goto no_match;
+ }
+
+ /* Event loglevel. */
+ if (event->attr.loglevel != key->loglevel) {
+ if (event->attr.loglevel_type == LTTNG_UST_LOGLEVEL_ALL
+ && key->loglevel == 0 && event->attr.loglevel == -1) {
+ /*
+ * Match is accepted. This is because on event creation, the
+ * loglevel is set to -1 if the event loglevel type is ALL so 0 and
+ * -1 are accepted for this loglevel type since 0 is the one set by
+ * the API when receiving an enable event.
+ */
+ } else {
+ goto no_match;
+ }
+ }
+
+ /* One of the filters is NULL, fail. */
+ if ((key->filter && !event->filter) || (!key->filter && event->filter)) {
+ goto no_match;
+ }
+
+ if (key->filter && event->filter) {
+ /* Both filters exists, check length followed by the bytecode. */
+ if (event->filter->len != key->filter->len ||
+ memcmp(event->filter->data, key->filter->data,
+ event->filter->len) != 0) {
+ goto no_match;
+ }
+ }
+
+ /* Match. */
+ return 1;
+
+no_match:
+ return 0;
+}
+
+/*
+ * Unique add of an ust app event in the given ht. This uses the custom
+ * ht_match_ust_app_event match function and the event name as hash.
+ */
+static void add_unique_ust_app_event(struct lttng_ht *ht,
+ struct ust_app_event *event)
+{
+ struct cds_lfht_node *node_ptr;
+ struct ust_app_ht_key key;
+
+ assert(ht);
+ assert(ht->ht);
+ assert(event);
+
+ key.name = event->attr.name;
+ key.filter = event->filter;
+ key.loglevel = event->attr.loglevel;
+
+ node_ptr = cds_lfht_add_unique(ht->ht,
+ ht->hash_fct(event->node.key, lttng_ht_seed),
+ ht_match_ust_app_event, &key, &event->node.node);
+ assert(node_ptr == &event->node.node);
+}
+
/*
* Delete ust context safely. RCU read lock must be held before calling
* this function.
static
void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx)
{
+ int ret;
+
+ assert(ua_ctx);
+
if (ua_ctx->obj) {
- ustctl_release_object(sock, ua_ctx->obj);
+ ret = ustctl_release_object(sock, ua_ctx->obj);
+ if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
+ ERR("UST app sock %d release context obj failed with ret %d",
+ sock, ret);
+ }
free(ua_ctx->obj);
}
free(ua_ctx);
void delete_ust_app_event(int sock, struct ust_app_event *ua_event)
{
int ret;
- struct lttng_ht_iter iter;
- struct ust_app_ctx *ua_ctx;
- /* Destroy each context of event */
- cds_lfht_for_each_entry(ua_event->ctx->ht, &iter.iter, ua_ctx,
- node.node) {
- ret = lttng_ht_del(ua_event->ctx, &iter);
- assert(!ret);
- delete_ust_app_ctx(sock, ua_ctx);
- }
- lttng_ht_destroy(ua_event->ctx);
+ assert(ua_event);
+
+ free(ua_event->filter);
if (ua_event->obj != NULL) {
- ustctl_release_object(sock, ua_event->obj);
+ ret = ustctl_release_object(sock, ua_event->obj);
+ if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
+ ERR("UST app sock %d release event obj failed with ret %d",
+ sock, ret);
+ }
free(ua_event->obj);
}
free(ua_event);
* this function.
*/
static
-void delete_ust_app_stream(int sock, struct ltt_ust_stream *stream)
+void delete_ust_app_stream(int sock, struct ust_app_stream *stream)
{
+ int ret;
+
+ assert(stream);
+
if (stream->obj) {
- ustctl_release_object(sock, stream->obj);
+ ret = ustctl_release_object(sock, stream->obj);
+ if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
+ ERR("UST app sock %d release stream obj failed with ret %d",
+ sock, ret);
+ }
+ lttng_fd_put(LTTNG_FD_APPS, 2);
free(stream->obj);
}
free(stream);
struct lttng_ht_iter iter;
struct ust_app_event *ua_event;
struct ust_app_ctx *ua_ctx;
- struct ltt_ust_stream *stream, *stmp;
+ struct ust_app_stream *stream, *stmp;
+
+ assert(ua_chan);
+
+ DBG3("UST app deleting channel %s", ua_chan->name);
/* Wipe stream */
cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) {
lttng_ht_destroy(ua_chan->events);
if (ua_chan->obj != NULL) {
- ustctl_release_object(sock, ua_chan->obj);
+ ret = ustctl_release_object(sock, ua_chan->obj);
+ if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
+ ERR("UST app sock %d release channel obj failed with ret %d",
+ sock, ret);
+ }
+ lttng_fd_put(LTTNG_FD_APPS, 2);
free(ua_chan->obj);
}
free(ua_chan);
struct ust_app_channel *ua_chan;
if (ua_sess->metadata) {
- if (ua_sess->metadata->stream_obj) {
- ustctl_release_object(sock, ua_sess->metadata->stream_obj);
- free(ua_sess->metadata->stream_obj);
- }
- if (ua_sess->metadata->obj) {
- ustctl_release_object(sock, ua_sess->metadata->obj);
- free(ua_sess->metadata->obj);
- }
+ delete_ust_app_channel(sock, ua_sess->metadata);
}
cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
lttng_ht_destroy(ua_sess->channels);
if (ua_sess->handle != -1) {
- ustctl_release_handle(sock, ua_sess->handle);
+ ret = ustctl_release_handle(sock, ua_sess->handle);
+ if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
+ ERR("UST app sock %d release session handle failed with ret %d",
+ sock, ret);
+ }
}
free(ua_sess);
}
void delete_ust_app(struct ust_app *app)
{
int ret, sock;
- struct lttng_ht_iter iter;
- struct ust_app_session *ua_sess;
+ struct ust_app_session *ua_sess, *tmp_ua_sess;
rcu_read_lock();
/* Delete ust app sessions info */
- sock = app->key.sock;
- app->key.sock = -1;
+ sock = app->sock;
+ app->sock = -1;
+
+ lttng_ht_destroy(app->sessions);
/* Wipe sessions */
- cds_lfht_for_each_entry(app->sessions->ht, &iter.iter, ua_sess,
- node.node) {
- ret = lttng_ht_del(app->sessions, &iter);
- assert(!ret);
- delete_ust_app_session(app->key.sock, ua_sess);
+ cds_list_for_each_entry_safe(ua_sess, tmp_ua_sess, &app->teardown_head,
+ teardown_node) {
+ /* Free every object in the session and the session. */
+ delete_ust_app_session(sock, ua_sess);
}
- lttng_ht_destroy(app->sessions);
/*
- * Wait until we have removed the key from the sock hash table before
- * closing this socket, otherwise an application could re-use the socket ID
- * and race with the teardown, using the same hash table entry.
+ * Wait until we have deleted the application from the sock hash table
+ * before closing this socket, otherwise an application could re-use the
+ * socket ID and race with the teardown, using the same hash table entry.
+ *
+ * It's OK to leave the close in call_rcu. We want it to stay unique for
+ * all RCU readers that could run concurrently with unregister app,
+ * therefore we _need_ to only close that socket after a grace period. So
+ * it should stay in this RCU callback.
+ *
+ * This close() is a very important step of the synchronization model so
+ * every modification to this function must be carefully reviewed.
*/
ret = close(sock);
if (ret) {
PERROR("close");
}
+ lttng_fd_put(LTTNG_FD_APPS, 1);
- DBG2("UST app pid %d deleted", app->key.pid);
+ DBG2("UST app pid %d deleted", app->pid);
free(app);
rcu_read_unlock();
struct lttng_ht_node_ulong *node =
caa_container_of(head, struct lttng_ht_node_ulong, head);
struct ust_app *app =
- caa_container_of(node, struct ust_app, node);
+ caa_container_of(node, struct ust_app, pid_n);
- DBG3("Call RCU deleting app PID %d", app->key.pid);
+ DBG3("Call RCU deleting app PID %d", app->pid);
delete_ust_app(app);
}
+/*
+ * Delete the session from the application ht and delete the data structure by
+ * freeing every object inside and releasing them.
+ */
+static void destroy_session(struct ust_app *app,
+ struct ust_app_session *ua_sess)
+{
+ int ret;
+ struct lttng_ht_iter iter;
+
+ assert(app);
+ assert(ua_sess);
+
+ iter.iter.node = &ua_sess->node.node;
+ ret = lttng_ht_del(app->sessions, &iter);
+ if (ret) {
+ /* Already scheduled for teardown. */
+ goto end;
+ }
+
+ /* Once deleted, free the data structure. */
+ delete_ust_app_session(app->sock, ua_sess);
+
+end:
+ return;
+}
+
/*
* Alloc new UST app session.
*/
ua_sess = zmalloc(sizeof(struct ust_app_session));
if (ua_sess == NULL) {
PERROR("malloc");
- goto error;
+ goto error_free;
}
ua_sess->handle = -1;
ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
+ if ((lttng_uuid_generate(ua_sess->uuid))) {
+ ERR("Failed to generate UST uuid");
+ goto error;
+ }
+
return ua_sess;
error:
+ free(ua_sess);
+error_free:
return NULL;
}
*/
static
struct ust_app_channel *alloc_ust_app_channel(char *name,
- struct lttng_ust_channel *attr)
+ struct lttng_ust_channel_attr *attr)
{
struct ust_app_channel *ua_chan;
ua_chan->enabled = 1;
ua_chan->handle = -1;
+ ua_chan->key = get_next_channel_key();
ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
lttng_ht_node_init_str(&ua_chan->node, ua_chan->name);
/* Copy attributes */
if (attr) {
- memcpy(&ua_chan->attr, attr, sizeof(ua_chan->attr));
+ /* Translate from lttng_ust_channel to ustctl_consumer_channel_attr. */
+ ua_chan->attr.subbuf_size = attr->subbuf_size;
+ ua_chan->attr.num_subbuf = attr->num_subbuf;
+ ua_chan->attr.overwrite = attr->overwrite;
+ ua_chan->attr.switch_timer_interval = attr->switch_timer_interval;
+ ua_chan->attr.read_timer_interval = attr->read_timer_interval;
+ ua_chan->attr.output = attr->output;
}
+ /* By default, the channel is a per cpu channel. */
+ ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU;
DBG3("UST app channel %s allocated", ua_chan->name);
return NULL;
}
+/*
+ * Allocate and initialize a UST app stream.
+ *
+ * Return newly allocated stream pointer or NULL on error.
+ */
+struct ust_app_stream *ust_app_alloc_stream(void)
+{
+ struct ust_app_stream *stream = NULL;
+
+ stream = zmalloc(sizeof(*stream));
+ if (stream == NULL) {
+ PERROR("zmalloc ust app stream");
+ goto error;
+ }
+
+ /* Zero could be a valid value for a handle so flag it to -1. */
+ stream->handle = -1;
+
+error:
+ return stream;
+}
+
/*
* Alloc new UST app event.
*/
ua_event->enabled = 1;
strncpy(ua_event->name, name, sizeof(ua_event->name));
ua_event->name[sizeof(ua_event->name) - 1] = '\0';
- ua_event->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
lttng_ht_node_init_str(&ua_event->node, ua_event->name);
/* Copy attributes */
return ua_ctx;
}
+/*
+ * Allocate a filter and copy the given original filter.
+ *
+ * Return allocated filter or NULL on error.
+ */
+static struct lttng_ust_filter_bytecode *alloc_copy_ust_app_filter(
+ struct lttng_ust_filter_bytecode *orig_f)
+{
+ struct lttng_ust_filter_bytecode *filter = NULL;
+
+ /* Copy filter bytecode */
+ filter = zmalloc(sizeof(*filter) + orig_f->len);
+ if (!filter) {
+ PERROR("zmalloc alloc ust app filter");
+ goto error;
+ }
+
+ memcpy(filter, orig_f, sizeof(*filter) + orig_f->len);
+
+error:
+ return filter;
+}
+
/*
* Find an ust_app using the sock and return it. RCU read side lock must be
* held before calling this helper function.
struct ust_app *find_app_by_sock(int sock)
{
struct lttng_ht_node_ulong *node;
- struct ust_app_key *key;
struct lttng_ht_iter iter;
- lttng_ht_lookup(ust_app_sock_key_map, (void *)((unsigned long) sock),
- &iter);
- node = lttng_ht_iter_get_node_ulong(&iter);
- if (node == NULL) {
- DBG2("UST app find by sock %d key not found", sock);
- goto error;
- }
- key = caa_container_of(node, struct ust_app_key, node);
-
- lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) key->pid), &iter);
+ lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter);
node = lttng_ht_iter_get_node_ulong(&iter);
if (node == NULL) {
DBG2("UST app find by sock %d not found", sock);
goto error;
}
- return caa_container_of(node, struct ust_app, node);
+
+ return caa_container_of(node, struct ust_app, sock_n);
error:
return NULL;
}
+/*
+ * Lookup for an ust app event based on event name, filter bytecode and the
+ * event loglevel.
+ *
+ * Return an ust_app_event object or NULL on error.
+ */
+static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht,
+ char *name, struct lttng_ust_filter_bytecode *filter, int loglevel)
+{
+ struct lttng_ht_iter iter;
+ struct lttng_ht_node_str *node;
+ struct ust_app_event *event = NULL;
+ struct ust_app_ht_key key;
+
+ assert(name);
+ assert(ht);
+
+ /* Setup key for event lookup. */
+ key.name = name;
+ key.filter = filter;
+ key.loglevel = loglevel;
+
+ /* Lookup using the event name as hash and a custom match fct. */
+ cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed),
+ ht_match_ust_app_event, &key, &iter.iter);
+ node = lttng_ht_iter_get_node_str(&iter);
+ if (node == NULL) {
+ goto end;
+ }
+
+ event = caa_container_of(node, struct ust_app_event, node);
+
+end:
+ return event;
+}
+
/*
* Create the channel context on the tracer.
*/
{
int ret;
- ret = ustctl_add_context(app->key.sock, &ua_ctx->ctx,
+ health_code_update();
+
+ ret = ustctl_add_context(app->sock, &ua_ctx->ctx,
ua_chan->obj, &ua_ctx->obj);
if (ret < 0) {
+ if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
+ ERR("UST app create channel context failed for app (pid: %d) "
+ "with ret %d", app->pid, ret);
+ } else {
+ DBG3("UST app disable event failed. Application is dead.");
+ }
goto error;
}
DBG2("UST app context created successfully for channel %s", ua_chan->name);
error:
+ health_code_update();
return ret;
}
/*
- * Create the event context on the tracer.
+ * Set the filter on the tracer.
*/
static
-int create_ust_event_context(struct ust_app_event *ua_event,
- struct ust_app_ctx *ua_ctx, struct ust_app *app)
+int set_ust_event_filter(struct ust_app_event *ua_event,
+ struct ust_app *app)
{
int ret;
- ret = ustctl_add_context(app->key.sock, &ua_ctx->ctx,
- ua_event->obj, &ua_ctx->obj);
- if (ret < 0) {
+ health_code_update();
+
+ if (!ua_event->filter) {
+ ret = 0;
goto error;
}
- ua_ctx->handle = ua_ctx->obj->handle;
+ ret = ustctl_set_filter(app->sock, ua_event->filter,
+ ua_event->obj);
+ if (ret < 0) {
+ if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
+ ERR("UST app event %s filter failed for app (pid: %d) "
+ "with ret %d", ua_event->attr.name, app->pid, ret);
+ } else {
+ DBG3("UST app filter event failed. Application is dead.");
+ }
+ goto error;
+ }
- DBG2("UST app context created successfully for event %s", ua_event->name);
+ DBG2("UST filter set successfully for event %s", ua_event->name);
error:
+ health_code_update();
return ret;
}
{
int ret;
- ret = ustctl_disable(app->key.sock, ua_event->obj);
+ health_code_update();
+
+ ret = ustctl_disable(app->sock, ua_event->obj);
if (ret < 0) {
- ERR("UST app event %s disable failed for app (pid: %d) "
- "and session handle %d with ret %d",
- ua_event->attr.name, app->key.pid, ua_sess->handle, ret);
+ if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
+ ERR("UST app event %s disable failed for app (pid: %d) "
+ "and session handle %d with ret %d",
+ ua_event->attr.name, app->pid, ua_sess->handle, ret);
+ } else {
+ DBG3("UST app disable event failed. Application is dead.");
+ }
goto error;
}
DBG2("UST app event %s disabled successfully for app (pid: %d)",
- ua_event->attr.name, app->key.pid);
+ ua_event->attr.name, app->pid);
error:
+ health_code_update();
return ret;
}
{
int ret;
- ret = ustctl_disable(app->key.sock, ua_chan->obj);
+ health_code_update();
+
+ ret = ustctl_disable(app->sock, ua_chan->obj);
if (ret < 0) {
- ERR("UST app channel %s disable failed for app (pid: %d) "
- "and session handle %d with ret %d",
- ua_chan->name, app->key.pid, ua_sess->handle, ret);
+ if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
+ ERR("UST app channel %s disable failed for app (pid: %d) "
+ "and session handle %d with ret %d",
+ ua_chan->name, app->pid, ua_sess->handle, ret);
+ } else {
+ DBG3("UST app disable channel failed. Application is dead.");
+ }
goto error;
}
DBG2("UST app channel %s disabled successfully for app (pid: %d)",
- ua_chan->name, app->key.pid);
+ ua_chan->name, app->pid);
error:
+ health_code_update();
return ret;
}
{
int ret;
- ret = ustctl_enable(app->key.sock, ua_chan->obj);
+ health_code_update();
+
+ ret = ustctl_enable(app->sock, ua_chan->obj);
if (ret < 0) {
- ERR("UST app channel %s enable failed for app (pid: %d) "
- "and session handle %d with ret %d",
- ua_chan->name, app->key.pid, ua_sess->handle, ret);
+ if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
+ ERR("UST app channel %s enable failed for app (pid: %d) "
+ "and session handle %d with ret %d",
+ ua_chan->name, app->pid, ua_sess->handle, ret);
+ } else {
+ DBG3("UST app enable channel failed. Application is dead.");
+ }
goto error;
}
ua_chan->enabled = 1;
DBG2("UST app channel %s enabled successfully for app (pid: %d)",
- ua_chan->name, app->key.pid);
+ ua_chan->name, app->pid);
error:
+ health_code_update();
return ret;
}
{
int ret;
- ret = ustctl_enable(app->key.sock, ua_event->obj);
+ health_code_update();
+
+ ret = ustctl_enable(app->sock, ua_event->obj);
if (ret < 0) {
- ERR("UST app event %s enable failed for app (pid: %d) "
- "and session handle %d with ret %d",
- ua_event->attr.name, app->key.pid, ua_sess->handle, ret);
+ if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
+ ERR("UST app event %s enable failed for app (pid: %d) "
+ "and session handle %d with ret %d",
+ ua_event->attr.name, app->pid, ua_sess->handle, ret);
+ } else {
+ DBG3("UST app enable event failed. Application is dead.");
+ }
goto error;
}
DBG2("UST app event %s enabled successfully for app (pid: %d)",
- ua_event->attr.name, app->key.pid);
+ ua_event->attr.name, app->pid);
error:
+ health_code_update();
return ret;
}
/*
- * Open metadata onto the UST tracer for a UST session.
+ * Create the specified channel onto the UST tracer for a UST session.
+ *
+ * Return 0 on success. On error, a negative value is returned.
*/
-static int open_ust_metadata(struct ust_app *app,
- struct ust_app_session *ua_sess)
+static int create_ust_channel(struct ust_app *app,
+ struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan,
+ struct consumer_output *consumer)
{
int ret;
- struct lttng_ust_channel_attr uattr;
-
- uattr.overwrite = ua_sess->metadata->attr.overwrite;
- uattr.subbuf_size = ua_sess->metadata->attr.subbuf_size;
- uattr.num_subbuf = ua_sess->metadata->attr.num_subbuf;
- uattr.switch_timer_interval =
- ua_sess->metadata->attr.switch_timer_interval;
- uattr.read_timer_interval =
- ua_sess->metadata->attr.read_timer_interval;
- uattr.output = ua_sess->metadata->attr.output;
-
- /* UST tracer metadata creation */
- ret = ustctl_open_metadata(app->key.sock, ua_sess->handle, &uattr,
- &ua_sess->metadata->obj);
- if (ret < 0) {
- ERR("UST app open metadata failed for app pid:%d with ret %d",
- app->key.pid, ret);
+ unsigned int nb_fd = 0;
+ struct consumer_socket *socket;
+ struct ust_app_stream *stream, *stmp;
+
+ assert(app);
+ assert(ua_sess);
+ assert(ua_chan);
+ assert(consumer);
+
+ health_code_update();
+
+ /* Get the right consumer socket for the application. */
+ socket = find_consumer_socket_by_bitness(app->bits_per_long, consumer);
+ if (!socket) {
+ ret = -1;
goto error;
}
- ua_sess->metadata->handle = ua_sess->metadata->obj->handle;
+ health_code_update();
-error:
- return ret;
-}
+ /*
+ * Ask consumer to create channel. The consumer will return the number of
+ * stream we have to expect.
+ */
+ ret = ust_consumer_ask_channel(ua_sess, ua_chan, consumer, socket);
+ if (ret < 0) {
+ goto error;
+ }
-/*
- * Create stream onto the UST tracer for a UST session.
- */
-static int create_ust_stream(struct ust_app *app,
- struct ust_app_session *ua_sess)
-{
- int ret;
+ /*
+ * Compute the number of fd needed before receiving them. It must be 2 per
+ * stream.
+ */
+ nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count;
- ret = ustctl_create_stream(app->key.sock, ua_sess->metadata->obj,
- &ua_sess->metadata->stream_obj);
+ /* Reserve the amount of file descriptor we need. */
+ ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd);
if (ret < 0) {
- ERR("UST create metadata stream failed");
- goto error;
+ ERR("Exhausted number of available FD upon create channel");
+ goto error_fd_get;
}
-error:
- return ret;
-}
+ health_code_update();
-/*
- * Create the specified channel onto the UST tracer for a UST session.
- */
-static int create_ust_channel(struct ust_app *app,
- struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
-{
- int ret;
+ /*
+ * Now get the channel from the consumer. This call wil populate the stream
+ * list of that channel and set the ust object.
+ */
+ ret = ust_consumer_get_channel(socket, ua_chan);
+ if (ret < 0) {
+ goto error_destroy;
+ }
- /* TODO: remove cast and use lttng-ust-abi.h */
- ret = ustctl_create_channel(app->key.sock, ua_sess->handle,
- (struct lttng_ust_channel_attr *)&ua_chan->attr, &ua_chan->obj);
+ /* Send channel to the application. */
+ ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan);
if (ret < 0) {
- ERR("Creating channel %s for app (pid: %d, sock: %d) "
- "and session handle %d with ret %d",
- ua_chan->name, app->key.pid, app->key.sock,
- ua_sess->handle, ret);
goto error;
}
- ua_chan->handle = ua_chan->obj->handle;
+ /* Send all streams to application. */
+ cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) {
+ ret = ust_consumer_send_stream_to_ust(app, ua_chan, stream);
+ if (ret < 0) {
+ goto error;
+ }
+ /* We don't need the stream anymore once sent to the tracer. */
+ cds_list_del(&stream->list);
+ delete_ust_app_stream(-1, stream);
+ }
+
+ /* Flag the channel that it is sent to the application. */
+ ua_chan->is_sent = 1;
- DBG2("UST app channel %s created successfully for pid:%d and sock:%d",
- ua_chan->name, app->key.pid, app->key.sock);
+ health_code_update();
/* If channel is not enabled, disable it on the tracer */
if (!ua_chan->enabled) {
}
}
+ return 0;
+
+error_destroy:
+ lttng_fd_put(LTTNG_FD_APPS, nb_fd);
+error_fd_get:
+ /*
+ * Initiate a destroy channel on the consumer since we had an error
+ * handling it on our side. The return value is of no importance since we
+ * already have a ret value set by the previous error that we need to
+ * return.
+ */
+ (void) ust_consumer_destroy_channel(socket, ua_chan);
error:
+ health_code_update();
return ret;
}
{
int ret = 0;
+ health_code_update();
+
/* Create UST event on tracer */
- ret = ustctl_create_event(app->key.sock, &ua_event->attr, ua_chan->obj,
+ ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj,
&ua_event->obj);
if (ret < 0) {
- if (ret == -EEXIST) {
- ret = 0;
- goto error;
+ if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
+ ERR("Error ustctl create event %s for app pid: %d with ret %d",
+ ua_event->attr.name, app->pid, ret);
+ } else {
+ DBG3("UST app create event failed. Application is dead.");
}
- ERR("Error ustctl create event %s for app pid: %d with ret %d",
- ua_event->attr.name, app->key.pid, ret);
goto error;
}
ua_event->handle = ua_event->obj->handle;
DBG2("UST app event %s created successfully for pid:%d",
- ua_event->attr.name, app->key.pid);
+ ua_event->attr.name, app->pid);
+
+ health_code_update();
+
+ /* Set filter if one is present. */
+ if (ua_event->filter) {
+ ret = set_ust_event_filter(ua_event, app);
+ if (ret < 0) {
+ goto error;
+ }
+ }
/* If event not enabled, disable it on the tracer */
if (ua_event->enabled == 0) {
* just created it.
*/
switch (ret) {
- case -EPERM:
+ case -LTTNG_UST_ERR_PERM:
/* Code flow problem */
assert(0);
- case -EEXIST:
+ case -LTTNG_UST_ERR_EXIST:
/* It's OK for our use case. */
ret = 0;
break;
}
error:
+ health_code_update();
return ret;
}
static void shadow_copy_event(struct ust_app_event *ua_event,
struct ltt_ust_event *uevent)
{
- struct lttng_ht_iter iter;
- struct ltt_ust_context *uctx;
- struct ust_app_ctx *ua_ctx;
-
strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name));
ua_event->name[sizeof(ua_event->name) - 1] = '\0';
/* Copy event attributes */
memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr));
- cds_lfht_for_each_entry(uevent->ctx->ht, &iter.iter, uctx, node.node) {
- ua_ctx = alloc_ust_app_ctx(&uctx->ctx);
- if (ua_ctx == NULL) {
- /* malloc() failed. We should simply stop */
- return;
- }
-
- lttng_ht_node_init_ulong(&ua_ctx->node,
- (unsigned long) ua_ctx->ctx.ctx);
- lttng_ht_add_unique_ulong(ua_event->ctx, &ua_ctx->node);
+ /* Copy filter bytecode */
+ if (uevent->filter) {
+ ua_event->filter = alloc_copy_ust_app_filter(uevent->filter);
+ /* Filter might be NULL here in case of ENONEM. */
}
}
struct ltt_ust_channel *uchan)
{
struct lttng_ht_iter iter;
- struct lttng_ht_node_str *ua_event_node;
struct ltt_ust_event *uevent;
struct ltt_ust_context *uctx;
struct ust_app_event *ua_event;
strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name));
ua_chan->name[sizeof(ua_chan->name) - 1] = '\0';
- /* Copy event attributes */
- memcpy(&ua_chan->attr, &uchan->attr, sizeof(ua_chan->attr));
+
+ /* Copy event attributes since the layout is different. */
+ ua_chan->attr.subbuf_size = uchan->attr.subbuf_size;
+ ua_chan->attr.num_subbuf = uchan->attr.num_subbuf;
+ ua_chan->attr.overwrite = uchan->attr.overwrite;
+ ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval;
+ ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval;
+ ua_chan->attr.output = uchan->attr.output;
+ /*
+ * Note that the attribute channel type is not set since the channel on the
+ * tracing registry side does not have this information.
+ */
ua_chan->enabled = uchan->enabled;
/* Copy all events from ltt ust channel to ust app channel */
cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
- struct lttng_ht_iter uiter;
-
- lttng_ht_lookup(ua_chan->events, (void *) uevent->attr.name, &uiter);
- ua_event_node = lttng_ht_iter_get_node_str(&uiter);
- if (ua_event_node == NULL) {
+ ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name,
+ uevent->filter, uevent->attr.loglevel);
+ if (ua_event == NULL) {
DBG2("UST event %s not found on shadow copy channel",
uevent->attr.name);
ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
continue;
}
shadow_copy_event(ua_event, uevent);
- lttng_ht_add_unique_str(ua_chan->events, &ua_event->node);
+ add_unique_ust_app_event(ua_chan->events, ua_event);
}
}
ua_sess->uid = usess->uid;
ua_sess->gid = usess->gid;
- ret = snprintf(ua_sess->path, PATH_MAX, "%s/%s-%d-%s", usess->pathname,
- app->name, app->key.pid, datetime);
+ ret = snprintf(ua_sess->path, PATH_MAX, "%s-%d-%s/", app->name, app->pid,
+ datetime);
if (ret < 0) {
PERROR("asprintf UST shadow copy session");
/* TODO: We cannot return an error from here.. */
/* malloc failed FIXME: Might want to do handle ENOMEM .. */
continue;
}
-
shadow_copy_channel(ua_chan, uchan);
+ /*
+ * The concept of metadata channel does not exist on the tracing
+ * registry side of the session daemon so this can only be a per CPU
+ * channel and not metadata.
+ */
+ ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU;
+
lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node);
}
}
}
/*
- * Create a UST session onto the tracer of app and add it the session
- * hashtable.
+ * Create a session on the tracer side for the given app.
+ *
+ * On success, ua_sess_ptr is populated with the session pointer or else left
+ * untouched. If the session was created, is_created is set to 1. On error,
+ * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can
+ * be NULL.
*
- * Return ust app session or NULL on error.
+ * Returns 0 on success or else a negative code which is either -ENOMEM or
+ * -ENOTCONN which is the default code if the ustctl_create_session fails.
*/
-static struct ust_app_session *create_ust_app_session(
- struct ltt_ust_session *usess, struct ust_app *app)
+static int create_ust_app_session(struct ltt_ust_session *usess,
+ struct ust_app *app, struct ust_app_session **ua_sess_ptr,
+ int *is_created)
{
- int ret;
+ int ret, created = 0;
struct ust_app_session *ua_sess;
+ assert(usess);
+ assert(app);
+ assert(ua_sess_ptr);
+
+ health_code_update();
+
ua_sess = lookup_session_by_app(usess, app);
if (ua_sess == NULL) {
DBG2("UST app pid: %d session id %d not found, creating it",
- app->key.pid, usess->id);
+ app->pid, usess->id);
ua_sess = alloc_ust_app_session();
if (ua_sess == NULL) {
/* Only malloc can failed so something is really wrong */
- goto end;
+ ret = -ENOMEM;
+ goto error;
}
shadow_copy_session(ua_sess, usess, app);
+ created = 1;
}
+ health_code_update();
+
if (ua_sess->handle == -1) {
- ret = ustctl_create_session(app->key.sock);
+ ret = ustctl_create_session(app->sock);
if (ret < 0) {
- ERR("Creating session for app pid %d", app->key.pid);
- /* This means that the tracer is gone... */
- ua_sess = (void*) -1UL;
+ if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
+ ERR("Creating session for app pid %d with ret %d",
+ app->pid, ret);
+ } else {
+ DBG("UST app creating session failed. Application is dead");
+ }
+ delete_ust_app_session(-1, ua_sess);
+ if (ret != -ENOMEM) {
+ /*
+ * Tracer is probably gone or got an internal error so let's
+ * behave like it will soon unregister or not usable.
+ */
+ ret = -ENOTCONN;
+ }
goto error;
}
DBG2("UST app session created successfully with handle %d", ret);
}
-end:
- return ua_sess;
+ *ua_sess_ptr = ua_sess;
+ if (is_created) {
+ *is_created = created;
+ }
+ /* Everything went well. */
+ ret = 0;
error:
- delete_ust_app_session(-1, ua_sess);
- return NULL;
+ health_code_update();
+ return ret;
}
/*
return ret;
}
-/*
- * Create an UST context and enable it for the event on the tracer.
- */
-static
-int create_ust_app_event_context(struct ust_app_session *ua_sess,
- struct ust_app_event *ua_event, struct lttng_ust_context *uctx,
- struct ust_app *app)
-{
- int ret = 0;
- struct lttng_ht_iter iter;
- struct lttng_ht_node_ulong *node;
- struct ust_app_ctx *ua_ctx;
-
- DBG2("UST app adding context to event %s", ua_event->name);
-
- lttng_ht_lookup(ua_event->ctx, (void *)((unsigned long)uctx->ctx), &iter);
- node = lttng_ht_iter_get_node_ulong(&iter);
- if (node != NULL) {
- ret = -EEXIST;
- goto error;
- }
-
- ua_ctx = alloc_ust_app_ctx(uctx);
- if (ua_ctx == NULL) {
- /* malloc failed */
- ret = -1;
- goto error;
- }
-
- lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx);
- lttng_ht_add_unique_ulong(ua_event->ctx, &ua_ctx->node);
-
- ret = create_ust_event_context(ua_event, ua_ctx, app);
- if (ret < 0) {
- goto error;
- }
-
-error:
- return ret;
-}
-
/*
* Enable on the tracer side a ust app event for the session and channel.
*/
}
/*
- * Create UST app channel and create it on the tracer.
+ * Create UST app channel and create it on the tracer. Set ua_chanp of the
+ * newly created channel if not NULL.
*/
-static struct ust_app_channel *create_ust_app_channel(
- struct ust_app_session *ua_sess, struct ltt_ust_channel *uchan,
- struct ust_app *app)
+static int create_ust_app_channel(struct ust_app_session *ua_sess,
+ struct ltt_ust_channel *uchan, struct ust_app *app,
+ struct consumer_output *consumer, enum lttng_ust_chan_type type,
+ struct ust_app_channel **ua_chanp)
{
int ret = 0;
struct lttng_ht_iter iter;
ua_chan = alloc_ust_app_channel(uchan->name, &uchan->attr);
if (ua_chan == NULL) {
/* Only malloc can fail here */
+ ret = -ENOMEM;
goto error;
}
shadow_copy_channel(ua_chan, uchan);
- ret = create_ust_channel(app, ua_sess, ua_chan);
+ /* Set channel type. */
+ ua_chan->attr.type = type;
+
+ ret = create_ust_channel(app, ua_sess, ua_chan, consumer);
if (ret < 0) {
- /* Not found previously means that it does not exist on the tracer */
- assert(ret != -EEXIST);
goto error;
}
+ /* Only add the channel if successful on the tracer side. */
lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node);
DBG2("UST app create channel %s for PID %d completed", ua_chan->name,
- app->key.pid);
+ app->pid);
end:
- return ua_chan;
+ if (ua_chanp) {
+ *ua_chanp = ua_chan;
+ }
+
+ /* Everything went well. */
+ return 0;
error:
- delete_ust_app_channel(-1, ua_chan);
- return NULL;
+ delete_ust_app_channel(ua_chan->is_sent ? app->sock : -1, ua_chan);
+ return ret;
}
/*
struct ust_app *app)
{
int ret = 0;
- struct lttng_ht_iter iter;
- struct lttng_ht_node_str *ua_event_node;
struct ust_app_event *ua_event;
/* Get event node */
- lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter);
- ua_event_node = lttng_ht_iter_get_node_str(&iter);
- if (ua_event_node != NULL) {
+ ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name,
+ uevent->filter, uevent->attr.loglevel);
+ if (ua_event != NULL) {
ret = -EEXIST;
goto end;
}
ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
if (ret < 0) {
/* Not found previously means that it does not exist on the tracer */
- assert(ret != -EEXIST);
+ assert(ret != -LTTNG_UST_ERR_EXIST);
goto error;
}
- lttng_ht_add_unique_str(ua_chan->events, &ua_event->node);
+ add_unique_ust_app_event(ua_chan->events, ua_event);
DBG2("UST app create event %s for PID %d completed", ua_event->name,
- app->key.pid);
+ app->pid);
end:
return ret;
* Create UST metadata and open it on the tracer side.
*/
static int create_ust_app_metadata(struct ust_app_session *ua_sess,
- char *pathname, struct ust_app *app)
+ struct ust_app *app, struct consumer_output *consumer)
{
int ret = 0;
+ struct ust_app_channel *metadata;
- if (ua_sess->metadata == NULL) {
- /* Allocate UST metadata */
- ua_sess->metadata = trace_ust_create_metadata(pathname);
- if (ua_sess->metadata == NULL) {
- /* malloc() failed */
- goto error;
- }
-
- ret = open_ust_metadata(app, ua_sess);
- if (ret < 0) {
- DBG3("Opening metadata failed. Cleaning up memory");
+ assert(ua_sess);
+ assert(app);
- /* Cleanup failed metadata struct */
- free(ua_sess->metadata);
- /*
- * This is very important because delete_ust_app_session check if
- * the pointer is null or not in order to delete the metadata.
- */
- ua_sess->metadata = NULL;
- goto error;
- }
+ if (ua_sess->metadata) {
+ /* Already exist. Return success. */
+ goto end;
+ }
- DBG2("UST metadata opened for app pid %d", app->key.pid);
+ /* Allocate UST metadata */
+ metadata = alloc_ust_app_channel(DEFAULT_METADATA_NAME, NULL);
+ if (!metadata) {
+ /* malloc() failed */
+ ret = -ENOMEM;
+ goto error;
}
- /* Open UST metadata stream */
- if (ua_sess->metadata->stream_obj == NULL) {
- ret = create_ust_stream(app, ua_sess);
- if (ret < 0) {
- goto error;
- }
+ /* Set default attributes for metadata. */
+ metadata->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
+ metadata->attr.subbuf_size = default_get_metadata_subbuf_size();
+ metadata->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM;
+ metadata->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER;
+ metadata->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER;
+ metadata->attr.output = LTTNG_UST_MMAP;
+ metadata->attr.type = LTTNG_UST_CHAN_METADATA;
- ret = run_as_mkdir(ua_sess->path, S_IRWXU | S_IRWXG,
- ua_sess->uid, ua_sess->gid);
- if (ret < 0) {
- PERROR("mkdir UST metadata");
- goto error;
- }
+ ret = create_ust_channel(app, ua_sess, metadata, consumer);
+ if (ret < 0) {
+ goto error_create;
+ }
- ret = snprintf(ua_sess->metadata->pathname, PATH_MAX,
- "%s/metadata", ua_sess->path);
- if (ret < 0) {
- PERROR("asprintf UST create stream");
- goto error;
- }
+ ua_sess->metadata = metadata;
- DBG2("UST metadata stream object created for app pid %d",
- app->key.pid);
- } else {
- ERR("Attempting to create stream without metadata opened");
- goto error;
- }
+ DBG2("UST metadata opened for app pid %d", app->pid);
+end:
return 0;
-
+error_create:
+ delete_ust_app_channel(metadata->is_sent ? app->sock : -1, metadata);
error:
- return -1;
+ return ret;
}
/*
DBG2("Found UST app by pid %d", pid);
- return caa_container_of(node, struct ust_app, node);
+ return caa_container_of(node, struct ust_app, pid_n);
error:
rcu_read_unlock();
struct ust_app *lta;
int ret;
- if ((msg->bits_per_long == 64 && ust_consumerd64_fd == -EINVAL)
- || (msg->bits_per_long == 32 && ust_consumerd32_fd == -EINVAL)) {
+ if ((msg->bits_per_long == 64 &&
+ (uatomic_read(&ust_consumerd64_fd) == -EINVAL))
+ || (msg->bits_per_long == 32 &&
+ (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) {
ERR("Registration failed: application \"%s\" (pid: %d) has "
"%d-bit long, but no consumerd for this long size is available.\n",
msg->name, msg->pid, msg->bits_per_long);
if (ret) {
PERROR("close");
}
+ lttng_fd_put(LTTNG_FD_APPS, 1);
return -EINVAL;
}
if (msg->major != LTTNG_UST_COMM_MAJOR) {
if (ret) {
PERROR("close");
}
+ lttng_fd_put(LTTNG_FD_APPS, 1);
return -EINVAL;
}
lta = zmalloc(sizeof(struct ust_app));
lta->name[16] = '\0';
lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
- /* Set key map */
- lta->key.pid = msg->pid;
- lttng_ht_node_init_ulong(<a->node, (unsigned long)lta->key.pid);
- lta->key.sock = sock;
- lttng_ht_node_init_ulong(<a->key.node, (unsigned long)lta->key.sock);
+ lta->pid = msg->pid;
+ lttng_ht_node_init_ulong(<a->pid_n, (unsigned long)lta->pid);
+ lta->sock = sock;
+ lttng_ht_node_init_ulong(<a->sock_n, (unsigned long)lta->sock);
+
+ CDS_INIT_LIST_HEAD(<a->teardown_head);
rcu_read_lock();
- lttng_ht_add_unique_ulong(ust_app_sock_key_map, <a->key.node);
- lttng_ht_add_unique_ulong(ust_app_ht, <a->node);
+
+ /*
+ * On a re-registration, we want to kick out the previous registration of
+ * that pid
+ */
+ lttng_ht_add_replace_ulong(ust_app_ht, <a->pid_n);
+
+ /*
+ * The socket _should_ be unique until _we_ call close. So, a add_unique
+ * for the ust_app_ht_by_sock is used which asserts fail if the entry was
+ * already in the table.
+ */
+ lttng_ht_add_unique_ulong(ust_app_ht_by_sock, <a->sock_n);
+
rcu_read_unlock();
DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s"
- " (version %d.%d)", lta->key.pid, lta->ppid, lta->uid, lta->gid,
- lta->key.sock, lta->name, lta->v_major, lta->v_minor);
+ " (version %d.%d)", lta->pid, lta->ppid, lta->uid, lta->gid,
+ lta->sock, lta->name, lta->v_major, lta->v_minor);
return 0;
}
struct ust_app *lta;
struct lttng_ht_node_ulong *node;
struct lttng_ht_iter iter;
+ struct ust_app_session *ua_sess;
int ret;
rcu_read_lock();
- lta = find_app_by_sock(sock);
- if (lta == NULL) {
- ERR("Unregister app sock %d not found!", sock);
+
+ /* Get the node reference for a call_rcu */
+ lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter);
+ node = lttng_ht_iter_get_node_ulong(&iter);
+ if (node == NULL) {
+ ERR("Unable to find app by sock %d", sock);
goto error;
}
- DBG("PID %d unregistering with sock %d", lta->key.pid, sock);
+ lta = caa_container_of(node, struct ust_app, sock_n);
+
+ DBG("PID %d unregistering with sock %d", lta->pid, sock);
+
+ /* Remove application from PID hash table */
+ ret = lttng_ht_del(ust_app_ht_by_sock, &iter);
+ assert(!ret);
+
+ /* Assign second node for deletion */
+ iter.iter.node = <a->pid_n.node;
+
+ /*
+ * Ignore return value since the node might have been removed before by an
+ * add replace during app registration because the PID can be reassigned by
+ * the OS.
+ */
+ ret = lttng_ht_del(ust_app_ht, &iter);
+ if (ret) {
+ DBG3("Unregister app by PID %d failed. This can happen on pid reuse",
+ lta->pid);
+ }
+
+ /* Remove sessions so they are not visible during deletion.*/
+ cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess,
+ node.node) {
+ ret = lttng_ht_del(lta->sessions, &iter);
+ if (ret) {
+ /* The session was already removed so scheduled for teardown. */
+ continue;
+ }
+
+ /*
+ * Add session to list for teardown. This is safe since at this point we
+ * are the only one using this list.
+ */
+ cds_list_add(&ua_sess->teardown_node, <a->teardown_head);
+ }
+
+ /* Free memory */
+ call_rcu(<a->pid_n.head, delete_ust_app_rcu);
+
+error:
+ rcu_read_unlock();
+ return;
+}
+
+/*
+ * Return traceable_app_count
+ */
+unsigned long ust_app_list_count(void)
+{
+ unsigned long count;
+
+ rcu_read_lock();
+ count = lttng_ht_get_count(ust_app_ht);
+ rcu_read_unlock();
+
+ return count;
+}
+
+/*
+ * Fill events array with all events name of all registered apps.
+ */
+int ust_app_list_events(struct lttng_event **events)
+{
+ int ret, handle;
+ size_t nbmem, count = 0;
+ struct lttng_ht_iter iter;
+ struct ust_app *app;
+ struct lttng_event *tmp_event;
+
+ nbmem = UST_APP_EVENT_LIST_SIZE;
+ tmp_event = zmalloc(nbmem * sizeof(struct lttng_event));
+ if (tmp_event == NULL) {
+ PERROR("zmalloc ust app events");
+ ret = -ENOMEM;
+ goto error;
+ }
+
+ rcu_read_lock();
+
+ cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
+ struct lttng_ust_tracepoint_iter uiter;
+
+ health_code_update();
+
+ if (!app->compatible) {
+ /*
+ * TODO: In time, we should notice the caller of this error by
+ * telling him that this is a version error.
+ */
+ continue;
+ }
+ handle = ustctl_tracepoint_list(app->sock);
+ if (handle < 0) {
+ if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) {
+ ERR("UST app list events getting handle failed for app pid %d",
+ app->pid);
+ }
+ continue;
+ }
+
+ while ((ret = ustctl_tracepoint_list_get(app->sock, handle,
+ &uiter)) != -LTTNG_UST_ERR_NOENT) {
+ /* Handle ustctl error. */
+ if (ret < 0) {
+ free(tmp_event);
+ if (ret != -LTTNG_UST_ERR_EXITING || ret != -EPIPE) {
+ ERR("UST app tp list get failed for app %d with ret %d",
+ app->sock, ret);
+ } else {
+ DBG3("UST app tp list get failed. Application is dead");
+ }
+ goto rcu_error;
+ }
- /* Remove application from socket hash table */
- lttng_ht_lookup(ust_app_sock_key_map, (void *)((unsigned long) sock), &iter);
- ret = lttng_ht_del(ust_app_sock_key_map, &iter);
- assert(!ret);
+ health_code_update();
+ if (count >= nbmem) {
+ /* In case the realloc fails, we free the memory */
+ void *ptr;
- /* Get the node reference for a call_rcu */
- lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) lta->key.pid), &iter);
- node = lttng_ht_iter_get_node_ulong(&iter);
- if (node == NULL) {
- ERR("Unable to find app sock %d by pid %d", sock, lta->key.pid);
- goto error;
+ DBG2("Reallocating event list from %zu to %zu entries", nbmem,
+ 2 * nbmem);
+ nbmem *= 2;
+ ptr = realloc(tmp_event, nbmem * sizeof(struct lttng_event));
+ if (ptr == NULL) {
+ PERROR("realloc ust app events");
+ free(tmp_event);
+ ret = -ENOMEM;
+ goto rcu_error;
+ }
+ tmp_event = ptr;
+ }
+ memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN);
+ tmp_event[count].loglevel = uiter.loglevel;
+ tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT;
+ tmp_event[count].pid = app->pid;
+ tmp_event[count].enabled = -1;
+ count++;
+ }
}
- /* Remove application from PID hash table */
- ret = lttng_ht_del(ust_app_ht, &iter);
- assert(!ret);
- call_rcu(&node->head, delete_ust_app_rcu);
-error:
- rcu_read_unlock();
- return;
-}
+ ret = count;
+ *events = tmp_event;
-/*
- * Return traceable_app_count
- */
-unsigned long ust_app_list_count(void)
-{
- unsigned long count;
+ DBG2("UST app list events done (%zu events)", count);
- rcu_read_lock();
- count = lttng_ht_get_count(ust_app_ht);
+rcu_error:
rcu_read_unlock();
-
- return count;
+error:
+ health_code_update();
+ return ret;
}
/*
* Fill events array with all events name of all registered apps.
*/
-int ust_app_list_events(struct lttng_event **events)
+int ust_app_list_event_fields(struct lttng_event_field **fields)
{
int ret, handle;
size_t nbmem, count = 0;
struct lttng_ht_iter iter;
struct ust_app *app;
- struct lttng_event *tmp;
+ struct lttng_event_field *tmp_event;
nbmem = UST_APP_EVENT_LIST_SIZE;
- tmp = zmalloc(nbmem * sizeof(struct lttng_event));
- if (tmp == NULL) {
- PERROR("zmalloc ust app events");
+ tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field));
+ if (tmp_event == NULL) {
+ PERROR("zmalloc ust app event fields");
ret = -ENOMEM;
goto error;
}
rcu_read_lock();
- cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
- struct lttng_ust_tracepoint_iter uiter;
+ cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
+ struct lttng_ust_field_iter uiter;
+
+ health_code_update();
if (!app->compatible) {
/*
*/
continue;
}
- handle = ustctl_tracepoint_list(app->key.sock);
+ handle = ustctl_tracepoint_field_list(app->sock);
if (handle < 0) {
- ERR("UST app list events getting handle failed for app pid %d",
- app->key.pid);
+ if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) {
+ ERR("UST app list field getting handle failed for app pid %d",
+ app->pid);
+ }
continue;
}
- while ((ret = ustctl_tracepoint_list_get(app->key.sock, handle,
- &uiter)) != -ENOENT) {
+ while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle,
+ &uiter)) != -LTTNG_UST_ERR_NOENT) {
+ /* Handle ustctl error. */
+ if (ret < 0) {
+ free(tmp_event);
+ if (ret != -LTTNG_UST_ERR_EXITING || ret != -EPIPE) {
+ ERR("UST app tp list field failed for app %d with ret %d",
+ app->sock, ret);
+ } else {
+ DBG3("UST app tp list field failed. Application is dead");
+ }
+ goto rcu_error;
+ }
+
+ health_code_update();
if (count >= nbmem) {
- DBG2("Reallocating event list from %zu to %zu entries", nbmem,
+ /* In case the realloc fails, we free the memory */
+ void *ptr;
+
+ DBG2("Reallocating event field list from %zu to %zu entries", nbmem,
2 * nbmem);
nbmem *= 2;
- tmp = realloc(tmp, nbmem * sizeof(struct lttng_event));
- if (tmp == NULL) {
- PERROR("realloc ust app events");
+ ptr = realloc(tmp_event, nbmem * sizeof(struct lttng_event_field));
+ if (ptr == NULL) {
+ PERROR("realloc ust app event fields");
+ free(tmp_event);
ret = -ENOMEM;
goto rcu_error;
}
+ tmp_event = ptr;
}
- memcpy(tmp[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN);
- tmp[count].loglevel = uiter.loglevel;
- tmp[count].type = LTTNG_UST_TRACEPOINT;
- tmp[count].pid = app->key.pid;
- tmp[count].enabled = -1;
+
+ memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN);
+ tmp_event[count].type = uiter.type;
+ tmp_event[count].nowrite = uiter.nowrite;
+
+ memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN);
+ tmp_event[count].event.loglevel = uiter.loglevel;
+ tmp_event[count].event.type = LTTNG_UST_TRACEPOINT;
+ tmp_event[count].event.pid = app->pid;
+ tmp_event[count].event.enabled = -1;
count++;
}
}
ret = count;
- *events = tmp;
+ *fields = tmp_event;
- DBG2("UST app list events done (%zu events)", count);
+ DBG2("UST app list event fields done (%zu events)", count);
rcu_error:
rcu_read_unlock();
error:
+ health_code_update();
return ret;
}
void ust_app_clean_list(void)
{
int ret;
+ struct ust_app *app;
struct lttng_ht_iter iter;
- struct lttng_ht_node_ulong *node;
DBG2("UST app cleaning registered apps hash table");
rcu_read_lock();
- cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, node, node) {
+ cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
ret = lttng_ht_del(ust_app_ht, &iter);
assert(!ret);
- call_rcu(&node->head, delete_ust_app_rcu);
+ call_rcu(&app->pid_n.head, delete_ust_app_rcu);
}
- /* Destroy is done only when the ht is empty */
- lttng_ht_destroy(ust_app_ht);
- cds_lfht_for_each_entry(ust_app_sock_key_map->ht, &iter.iter, node, node) {
- ret = lttng_ht_del(ust_app_sock_key_map, &iter);
+ /* Cleanup socket hash table */
+ cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app,
+ sock_n.node) {
+ ret = lttng_ht_del(ust_app_ht_by_sock, &iter);
assert(!ret);
}
+
/* Destroy is done only when the ht is empty */
- lttng_ht_destroy(ust_app_sock_key_map);
+ lttng_ht_destroy(ust_app_ht);
+ lttng_ht_destroy(ust_app_ht_by_sock);
rcu_read_unlock();
}
void ust_app_ht_alloc(void)
{
ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
- ust_app_sock_key_map = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
+ ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
}
/*
rcu_read_lock();
/* For every registered applications */
- cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
+ cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
struct lttng_ht_iter uiter;
if (!app->compatible) {
/*
rcu_read_lock();
/* For every registered applications */
- cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
+ cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
if (!app->compatible) {
/*
* TODO: In time, we should notice the caller of this error by
rcu_read_lock();
/* For all registered applications */
- cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
+ cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
if (!app->compatible) {
/*
* TODO: In time, we should notice the caller of this error by
ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
if (ua_chan_node == NULL) {
DBG2("Channel %s not found in session id %d for app pid %d."
- "Skipping", uchan->name, usess->id, app->key.pid);
+ "Skipping", uchan->name, usess->id, app->pid);
continue;
}
ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
ua_event_node = lttng_ht_iter_get_node_str(&uiter);
if (ua_event_node == NULL) {
DBG2("Event %s not found in channel %s for app pid %d."
- "Skipping", uevent->attr.name, uchan->name, app->key.pid);
+ "Skipping", uevent->attr.name, uchan->name, app->pid);
continue;
}
ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
rcu_read_lock();
/* For all registered applications */
- cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
+ cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
if (!app->compatible) {
/*
* TODO: In time, we should notice the caller of this error by
continue;
}
ua_sess = lookup_session_by_app(usess, app);
- /* If ua_sess is NULL, there is a code flow error */
- assert(ua_sess);
+ if (!ua_sess) {
+ /* The application has problem or is probably dead. */
+ continue;
+ }
/* Lookup channel in the ust app session */
lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
int ust_app_create_channel_glb(struct ltt_ust_session *usess,
struct ltt_ust_channel *uchan)
{
+ int ret = 0, created;
struct lttng_ht_iter iter;
struct ust_app *app;
- struct ust_app_session *ua_sess;
- struct ust_app_channel *ua_chan;
+ struct ust_app_session *ua_sess = NULL;
/* Very wrong code flow */
assert(usess);
rcu_read_lock();
/* For every registered applications */
- cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
+ cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
if (!app->compatible) {
/*
* TODO: In time, we should notice the caller of this error by
* that if session exist, it will simply return a pointer to the ust
* app session.
*/
- ua_sess = create_ust_app_session(usess, app);
- if (ua_sess == NULL) {
- /* The malloc() failed. */
- goto error;
- } else if (ua_sess == (void *) -1UL) {
- /* The application's socket is not valid. Contiuing */
- continue;
+ ret = create_ust_app_session(usess, app, &ua_sess, &created);
+ if (ret < 0) {
+ switch (ret) {
+ case -ENOTCONN:
+ /*
+ * The application's socket is not valid. Either a bad socket
+ * or a timeout on it. We can't inform the caller that for a
+ * specific app, the session failed so lets continue here.
+ */
+ continue;
+ case -ENOMEM:
+ default:
+ goto error_rcu_unlock;
+ }
}
+ assert(ua_sess);
- /* Create channel onto application */
- ua_chan = create_ust_app_channel(ua_sess, uchan, app);
- if (ua_chan == NULL) {
- /* Major problem here and it's maybe the tracer or malloc() */
- goto error;
+ /* Create channel onto application. We don't need the chan ref. */
+ ret = create_ust_app_channel(ua_sess, uchan, app, usess->consumer,
+ LTTNG_UST_CHAN_PER_CPU, NULL);
+ if (ret < 0) {
+ if (ret == -ENOMEM) {
+ /* No more memory is a fatal error. Stop right now. */
+ goto error_rcu_unlock;
+ }
+ /* Cleanup the created session if it's the case. */
+ if (created) {
+ destroy_session(app, ua_sess);
+ }
}
}
+error_rcu_unlock:
rcu_read_unlock();
-
- return 0;
-
-error:
- return -1;
+ return ret;
}
/*
{
int ret = 0;
struct lttng_ht_iter iter, uiter;
- struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
+ struct lttng_ht_node_str *ua_chan_node;
struct ust_app *app;
struct ust_app_session *ua_sess;
struct ust_app_channel *ua_chan;
rcu_read_lock();
/* For all registered applications */
- cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
+ cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
if (!app->compatible) {
/*
* TODO: In time, we should notice the caller of this error by
continue;
}
ua_sess = lookup_session_by_app(usess, app);
- /* If ua_sess is NULL, there is a code flow error */
- assert(ua_sess);
+ if (!ua_sess) {
+ /* The application has problem or is probably dead. */
+ continue;
+ }
/* Lookup channel in the ust app session */
lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
- lttng_ht_lookup(ua_chan->events, (void*)uevent->attr.name, &uiter);
- ua_event_node = lttng_ht_iter_get_node_str(&uiter);
- if (ua_event_node == NULL) {
+ /* Get event node */
+ ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name,
+ uevent->filter, uevent->attr.loglevel);
+ if (ua_event == NULL) {
DBG3("UST app enable event %s not found for app PID %d."
- "Skipping app", uevent->attr.name, app->key.pid);
+ "Skipping app", uevent->attr.name, app->pid);
continue;
}
- ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
ret = enable_ust_app_event(ua_sess, ua_event, app);
if (ret < 0) {
rcu_read_lock();
/* For all registered applications */
- cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
+ cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
if (!app->compatible) {
/*
* TODO: In time, we should notice the caller of this error by
continue;
}
ua_sess = lookup_session_by_app(usess, app);
- /* If ua_sess is NULL, there is a code flow error */
- assert(ua_sess);
+ if (!ua_sess) {
+ /* The application has problem or is probably dead. */
+ continue;
+ }
/* Lookup channel in the ust app session */
lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
if (ret < 0) {
- if (ret != -EEXIST) {
+ if (ret != -LTTNG_UST_ERR_EXIST) {
/* Possible value at this point: -ENOMEM. If so, we stop! */
break;
}
DBG2("UST app event %s already exist on app PID %d",
- uevent->attr.name, app->key.pid);
+ uevent->attr.name, app->pid);
continue;
}
}
int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app)
{
int ret = 0;
- struct lttng_ht_iter iter;
struct ust_app_session *ua_sess;
- struct ust_app_channel *ua_chan;
- struct ltt_ust_stream *ustream;
- int consumerd_fd;
- DBG("Starting tracing for ust app pid %d", app->key.pid);
+ DBG("Starting tracing for ust app pid %d", app->pid);
rcu_read_lock();
ua_sess = lookup_session_by_app(usess, app);
if (ua_sess == NULL) {
- goto error_rcu_unlock;
+ /* The session is in teardown process. Ignore and continue. */
+ goto end;
}
/* Upon restart, we skip the setup, already done */
goto skip_setup;
}
- /* Indicate that the session has been started once */
- ua_sess->started = 1;
-
- ret = create_ust_app_metadata(ua_sess, usess->pathname, app);
- if (ret < 0) {
- goto error_rcu_unlock;
- }
-
- /* For each channel */
- cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
- node.node) {
- /* Create all streams */
- while (1) {
- /* Create UST stream */
- ustream = zmalloc(sizeof(*ustream));
- if (ustream == NULL) {
- PERROR("zmalloc ust stream");
+ /* Create directories if consumer is LOCAL and has a path defined. */
+ if (usess->consumer->type == CONSUMER_DST_LOCAL &&
+ strlen(usess->consumer->dst.trace_path) > 0) {
+ ret = run_as_mkdir_recursive(usess->consumer->dst.trace_path,
+ S_IRWXU | S_IRWXG, usess->uid, usess->gid);
+ if (ret < 0) {
+ if (ret != -EEXIST) {
+ ERR("Trace directory creation error");
goto error_rcu_unlock;
}
-
- ret = ustctl_create_stream(app->key.sock, ua_chan->obj,
- &ustream->obj);
- if (ret < 0) {
- /* Got all streams */
- break;
- }
- ustream->handle = ustream->obj->handle;
-
- /* Order is important */
- cds_list_add_tail(&ustream->list, &ua_chan->streams.head);
- ret = snprintf(ustream->pathname, PATH_MAX, "%s/%s_%u",
- ua_sess->path, ua_chan->name,
- ua_chan->streams.count++);
- if (ret < 0) {
- PERROR("asprintf UST create stream");
- continue;
- }
- DBG2("UST stream %d ready at %s", ua_chan->streams.count,
- ustream->pathname);
}
}
- switch (app->bits_per_long) {
- case 64:
- consumerd_fd = ust_consumerd64_fd;
- break;
- case 32:
- consumerd_fd = ust_consumerd32_fd;
- break;
- default:
- ret = -EINVAL;
- goto error_rcu_unlock;
- }
-
- /* Setup UST consumer socket and send fds to it */
- ret = ust_consumer_send_session(consumerd_fd, ua_sess);
+ /* Create the metadata for the application. */
+ ret = create_ust_app_metadata(ua_sess, app, usess->consumer);
if (ret < 0) {
goto error_rcu_unlock;
}
+ health_code_update();
+
skip_setup:
/* This start the UST tracing */
- ret = ustctl_start_session(app->key.sock, ua_sess->handle);
+ ret = ustctl_start_session(app->sock, ua_sess->handle);
if (ret < 0) {
- ERR("Error starting tracing for app pid: %d", app->key.pid);
+ if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
+ ERR("Error starting tracing for app pid: %d (ret: %d)",
+ app->pid, ret);
+ } else {
+ DBG("UST app start session failed. Application is dead.");
+ }
goto error_rcu_unlock;
}
+ /* Indicate that the session has been started once */
+ ua_sess->started = 1;
+
+ health_code_update();
+
/* Quiescent wait after starting trace */
- ustctl_wait_quiescent(app->key.sock);
+ ret = ustctl_wait_quiescent(app->sock);
+ if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
+ ERR("UST app wait quiescent failed for app pid %d ret %d",
+ app->pid, ret);
+ }
end:
rcu_read_unlock();
+ health_code_update();
return 0;
error_rcu_unlock:
rcu_read_unlock();
+ health_code_update();
return -1;
}
struct ust_app_session *ua_sess;
struct ust_app_channel *ua_chan;
- DBG("Stopping tracing for ust app pid %d", app->key.pid);
+ DBG("Stopping tracing for ust app pid %d", app->pid);
rcu_read_lock();
ua_sess = lookup_session_by_app(usess, app);
if (ua_sess == NULL) {
- /* Only malloc can failed so something is really wrong */
- goto error_rcu_unlock;
+ goto end;
}
/*
* If started = 0, it means that stop trace has been called for a session
- * that was never started. This is a code flow error and should never
- * happen.
+ * that was never started. It's possible since we can have a fail start
+ * from either the application manager thread or the command thread. Simply
+ * indicate that this is a stop error.
*/
- assert(ua_sess->started == 1);
+ if (!ua_sess->started) {
+ goto error_rcu_unlock;
+ }
+
+ health_code_update();
/* This inhibits UST tracing */
- ret = ustctl_stop_session(app->key.sock, ua_sess->handle);
+ ret = ustctl_stop_session(app->sock, ua_sess->handle);
if (ret < 0) {
- ERR("Error stopping tracing for app pid: %d", app->key.pid);
+ if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
+ ERR("Error stopping tracing for app pid: %d (ret: %d)",
+ app->pid, ret);
+ } else {
+ DBG("UST app stop session failed. Application is dead.");
+ }
goto error_rcu_unlock;
}
+ health_code_update();
+
/* Quiescent wait after stopping trace */
- ustctl_wait_quiescent(app->key.sock);
+ ret = ustctl_wait_quiescent(app->sock);
+ if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
+ ERR("UST app wait quiescent failed for app pid %d ret %d",
+ app->pid, ret);
+ }
+
+ health_code_update();
/* Flushing buffers */
cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
node.node) {
- ret = ustctl_sock_flush_buffer(app->key.sock, ua_chan->obj);
+ health_code_update();
+ assert(ua_chan->is_sent);
+ ret = ustctl_sock_flush_buffer(app->sock, ua_chan->obj);
if (ret < 0) {
- ERR("UST app PID %d channel %s flush failed with ret %d",
- app->key.pid, ua_chan->name, ret);
+ if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
+ ERR("UST app PID %d channel %s flush failed with ret %d",
+ app->pid, ua_chan->name, ret);
+ } else {
+ DBG3("UST app failed to flush %s. Application is dead.",
+ ua_chan->name);
+ /* No need to continue. */
+ goto end;
+ }
/* Continuing flushing all buffers */
continue;
}
}
+ health_code_update();
+
+ assert(ua_sess->metadata->is_sent);
/* Flush all buffers before stopping */
- ret = ustctl_sock_flush_buffer(app->key.sock, ua_sess->metadata->obj);
+ ret = ustctl_sock_flush_buffer(app->sock, ua_sess->metadata->obj);
if (ret < 0) {
- ERR("UST app PID %d metadata flush failed with ret %d", app->key.pid,
- ret);
+ if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
+ ERR("UST app PID %d metadata flush failed with ret %d", app->pid,
+ ret);
+ goto error_rcu_unlock;
+ } else {
+ DBG3("UST app failed to flush metadata. Application is dead.");
+ }
}
end:
rcu_read_unlock();
+ health_code_update();
return 0;
error_rcu_unlock:
rcu_read_unlock();
+ health_code_update();
return -1;
}
/*
* Destroy a specific UST session in apps.
*/
-int ust_app_destroy_trace(struct ltt_ust_session *usess, struct ust_app *app)
+static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app)
{
+ int ret;
struct ust_app_session *ua_sess;
- struct lttng_ust_object_data obj;
struct lttng_ht_iter iter;
struct lttng_ht_node_ulong *node;
- int ret;
- DBG("Destroy tracing for ust app pid %d", app->key.pid);
+ DBG("Destroy tracing for ust app pid %d", app->pid);
rcu_read_lock();
__lookup_session_by_app(usess, app, &iter);
node = lttng_ht_iter_get_node_ulong(&iter);
if (node == NULL) {
- /* Only malloc can failed so something is really wrong */
- goto error_rcu_unlock;
+ /* Session is being or is deleted. */
+ goto end;
}
ua_sess = caa_container_of(node, struct ust_app_session, node);
- ret = lttng_ht_del(app->sessions, &iter);
- assert(!ret);
- obj.handle = ua_sess->handle;
- obj.shm_fd = -1;
- obj.wait_fd = -1;
- obj.memory_map_size = 0;
- ustctl_release_object(app->key.sock, &obj);
- delete_ust_app_session(app->key.sock, ua_sess);
+ health_code_update();
+ destroy_session(app, ua_sess);
+
+ health_code_update();
/* Quiescent wait after stopping trace */
- ustctl_wait_quiescent(app->key.sock);
+ ret = ustctl_wait_quiescent(app->sock);
+ if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
+ ERR("UST app wait quiescent failed for app pid %d ret %d",
+ app->pid, ret);
+ }
end:
rcu_read_unlock();
+ health_code_update();
return 0;
-
-error_rcu_unlock:
- rcu_read_unlock();
- return -1;
}
/*
rcu_read_lock();
- cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
+ cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
ret = ust_app_start_trace(usess, app);
if (ret < 0) {
/* Continue to next apps even on error */
rcu_read_lock();
- cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
+ cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
ret = ust_app_stop_trace(usess, app);
if (ret < 0) {
/* Continue to next apps even on error */
rcu_read_lock();
- cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
- ret = ust_app_destroy_trace(usess, app);
+ cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
+ ret = destroy_trace(usess, app);
if (ret < 0) {
/* Continue to next apps even on error */
continue;
int ret = 0;
struct lttng_ht_iter iter, uiter, iter_ctx;
struct ust_app *app;
- struct ust_app_session *ua_sess;
+ struct ust_app_session *ua_sess = NULL;
struct ust_app_channel *ua_chan;
struct ust_app_event *ua_event;
struct ust_app_ctx *ua_ctx;
- if (usess == NULL) {
- ERR("No UST session on global update. Returning");
- goto error;
- }
+ assert(usess);
+ assert(sock >= 0);
DBG2("UST app global update for app sock %d for session id %d", sock,
usess->id);
app = find_app_by_sock(sock);
if (app == NULL) {
- ERR("Failed to update app sock %d", sock);
+ ERR("Failed to find app sock %d", sock);
goto error;
}
goto error;
}
- ua_sess = create_ust_app_session(usess, app);
- if (ua_sess == NULL) {
+ ret = create_ust_app_session(usess, app, &ua_sess, NULL);
+ if (ret < 0) {
+ /* Tracer is probably gone or ENOMEM. */
goto error;
}
+ assert(ua_sess);
/*
* We can iterate safely here over all UST app session sicne the create ust
*/
cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
node.node) {
- ret = create_ust_channel(app, ua_sess, ua_chan);
+ ret = create_ust_channel(app, ua_sess, ua_chan, usess->consumer);
if (ret < 0) {
- /* FIXME: Should we quit here or continue... */
- continue;
+ /*
+ * Stop everything. On error, the application failed, no more file
+ * descriptor are available or ENOMEM so stopping here is the only
+ * thing we can do for now.
+ */
+ goto error;
}
cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter_ctx.iter, ua_ctx,
node.node) {
ret = create_ust_channel_context(ua_chan, ua_ctx, app);
if (ret < 0) {
- /* FIXME: Should we quit here or continue... */
- continue;
+ goto error;
}
}
node.node) {
ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
if (ret < 0) {
- /* FIXME: Should we quit here or continue... */
- continue;
- }
-
- /* Add context on events. */
- cds_lfht_for_each_entry(ua_event->ctx->ht, &iter_ctx.iter,
- ua_ctx, node.node) {
- ret = create_ust_event_context(ua_event, ua_ctx, app);
- if (ret < 0) {
- /* FIXME: Should we quit here or continue... */
- continue;
- }
+ goto error;
}
}
}
goto error;
}
- DBG2("UST trace started for app pid %d", app->key.pid);
+ DBG2("UST trace started for app pid %d", app->pid);
}
+ /* Everything went well at this point. */
+ rcu_read_unlock();
+ return;
+
error:
+ if (ua_sess) {
+ destroy_session(app, ua_sess);
+ }
rcu_read_unlock();
return;
}
rcu_read_lock();
- cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
+ cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
if (!app->compatible) {
/*
* TODO: In time, we should notice the caller of this error by
return ret;
}
-/*
- * Add context to a specific event in a channel for global UST domain.
- */
-int ust_app_add_ctx_event_glb(struct ltt_ust_session *usess,
- struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent,
- struct ltt_ust_context *uctx)
-{
- int ret = 0;
- struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
- struct lttng_ht_iter iter, uiter;
- struct ust_app_session *ua_sess;
- struct ust_app_event *ua_event;
- struct ust_app_channel *ua_chan = NULL;
- struct ust_app *app;
-
- rcu_read_lock();
-
- cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
- if (!app->compatible) {
- /*
- * TODO: In time, we should notice the caller of this error by
- * telling him that this is a version error.
- */
- continue;
- }
- ua_sess = lookup_session_by_app(usess, app);
- if (ua_sess == NULL) {
- continue;
- }
-
- /* Lookup channel in the ust app session */
- lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
- ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
- if (ua_chan_node == NULL) {
- continue;
- }
- ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
- node);
-
- lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter);
- ua_event_node = lttng_ht_iter_get_node_str(&uiter);
- if (ua_event_node == NULL) {
- continue;
- }
- ua_event = caa_container_of(ua_event_node, struct ust_app_event,
- node);
-
- ret = create_ust_app_event_context(ua_sess, ua_event, &uctx->ctx, app);
- if (ret < 0) {
- continue;
- }
- }
-
- rcu_read_unlock();
- return ret;
-}
-
/*
* Enable event for a channel from a UST session for a specific PID.
*/
{
int ret = 0;
struct lttng_ht_iter iter;
- struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
+ struct lttng_ht_node_str *ua_chan_node;
struct ust_app *app;
struct ust_app_session *ua_sess;
struct ust_app_channel *ua_chan;
}
ua_sess = lookup_session_by_app(usess, app);
- /* If ua_sess is NULL, there is a code flow error */
- assert(ua_sess);
+ if (!ua_sess) {
+ /* The application has problem or is probably dead. */
+ goto error;
+ }
/* Lookup channel in the ust app session */
lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
- lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter);
- ua_event_node = lttng_ht_iter_get_node_str(&iter);
- if (ua_event_node == NULL) {
+ ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name,
+ uevent->filter, uevent->attr.loglevel);
+ if (ua_event == NULL) {
ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
if (ret < 0) {
goto error;
}
} else {
- ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
-
ret = enable_ust_app_event(ua_sess, ua_event, app);
if (ret < 0) {
goto error;
}
ua_sess = lookup_session_by_app(usess, app);
- /* If ua_sess is NULL, there is a code flow error */
- assert(ua_sess);
+ if (!ua_sess) {
+ /* The application has problem or is probably dead. */
+ goto error;
+ }
/* Lookup channel in the ust app session */
lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
app = find_app_by_sock(sock);
assert(app);
+ health_code_update();
+
ret = ustctl_tracer_version(sock, &app->version);
if (ret < 0) {
+ if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
+ ERR("UST app tracer version failed for app pid %d", app->pid);
+ }
goto error;
}
/* Validate version */
- if (app->version.major > UST_APP_MAJOR_VERSION) {
+ if (app->version.major != UST_APP_MAJOR_VERSION) {
goto error;
}
- DBG2("UST app PID %d is compatible with major version %d "
- "(supporting <= %d)", app->key.pid, app->version.major,
+ DBG2("UST app PID %d is compatible with internal major version %d "
+ "(supporting == %d)", app->pid, app->version.major,
UST_APP_MAJOR_VERSION);
app->compatible = 1;
rcu_read_unlock();
+ health_code_update();
return 0;
error:
- DBG2("UST app PID %d is not compatible with major version %d "
- "(supporting <= %d)", app->key.pid, app->version.major,
+ DBG2("UST app PID %d is not compatible with internal major version %d "
+ "(supporting == %d)", app->pid, app->version.major,
UST_APP_MAJOR_VERSION);
app->compatible = 0;
rcu_read_unlock();
+ health_code_update();
return -1;
}
rcu_read_lock();
- cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
+ cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
if (!app->compatible) {
/*
* TODO: In time, we should notice the caller of this error by
continue;
}
- ret = ustctl_calibrate(app->key.sock, calibrate);
+ health_code_update();
+
+ ret = ustctl_calibrate(app->sock, calibrate);
if (ret < 0) {
switch (ret) {
case -ENOSYS:
ret = 0;
break;
default:
- /* TODO: Report error to user */
DBG2("Calibrate app PID %d returned with error %d",
- app->key.pid, ret);
+ app->pid, ret);
break;
}
}
rcu_read_unlock();
+ health_code_update();
+
return ret;
}
projects / lttng-tools.git / blobdiff