#include <stdio.h>
#include <stdlib.h>
#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
#include <unistd.h>
+#include <urcu/compiler.h>
#include <lttngerr.h>
#include <lttng-share.h>
#include "hashtable.h"
#include "ust-app.h"
-#include "../hashtable/hash.h"
-#include "ust-ctl.h"
#include "ust-consumer.h"
+#include "ust-ctl.h"
/*
- * Delete a traceable application structure from the global list.
+ * Delete ust context safely. RCU read lock must be held before calling
+ * this function.
*/
-static void delete_ust_app(struct ust_app *lta)
+static
+void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx)
{
- int ret;
- struct cds_lfht_node *node;
- struct cds_lfht_iter iter;
-
- rcu_read_lock();
-
- free(lta->sessions);
- close(lta->key.sock);
-
- /* Remove from apps hash table */
- node = hashtable_lookup(ust_app_ht,
- (void *) ((unsigned long) lta->key.pid), sizeof(void *), &iter);
- if (node == NULL) {
- ERR("UST app pid %d not found in hash table", lta->key.pid);
- } else {
- ret = hashtable_del(ust_app_ht, &iter);
- if (ret) {
- ERR("UST app unable to delete app %d from hash table",
- lta->key.pid);
- } else {
- DBG2("UST app pid %d deleted", lta->key.pid);
- }
- }
-
- /* Remove from key hash table */
- node = hashtable_lookup(ust_app_sock_key_map,
- (void *) ((unsigned long) lta->key.sock), sizeof(void *), &iter);
- if (node == NULL) {
- ERR("UST app key %d not found in key hash table", lta->key.sock);
- } else {
- ret = hashtable_del(ust_app_sock_key_map, &iter);
- if (ret) {
- ERR("UST app unable to delete app sock %d from key hash table",
- lta->key.sock);
- } else {
- DBG2("UST app pair sock %d key %d deleted",
- lta->key.sock, lta->key.pid);
- }
+ if (ua_ctx->obj) {
+ ustctl_release_object(sock, ua_ctx->obj);
+ free(ua_ctx->obj);
}
-
- free(lta);
-
- rcu_read_unlock();
-}
-
-/*
- * URCU intermediate call to delete an UST app.
- */
-static void delete_ust_app_rcu(struct rcu_head *head)
-{
- struct cds_lfht_node *node =
- caa_container_of(head, struct cds_lfht_node, head);
- struct ust_app *app =
- caa_container_of(node, struct ust_app, node);
-
- delete_ust_app(app);
+ free(ua_ctx);
}
/*
- * Find an ust_app using the sock and return it.
+ * Delete ust app event safely. RCU read lock must be held before calling
+ * this function.
*/
-static struct ust_app *find_app_by_sock(int sock)
+static
+void delete_ust_app_event(int sock, struct ust_app_event *ua_event)
{
- struct cds_lfht_node *node;
- struct ust_app_key *key;
+ int ret;
struct cds_lfht_iter iter;
+ struct ust_app_ctx *ua_ctx;
- rcu_read_lock();
-
- node = hashtable_lookup(ust_app_sock_key_map,
- (void *)((unsigned long) sock), sizeof(void *), &iter);
- if (node == NULL) {
- DBG2("UST app find by sock %d key not found", sock);
- rcu_read_unlock();
- goto error;
+ cds_lfht_for_each_entry(ua_event->ctx, &iter, ua_ctx, node) {
+ ret = hashtable_del(ua_event->ctx, &iter);
+ assert(!ret);
+ delete_ust_app_ctx(sock, ua_ctx);
}
+ ret = hashtable_destroy(ua_event->ctx);
+ assert(!ret);
- key = caa_container_of(node, struct ust_app_key, node);
-
- node = hashtable_lookup(ust_app_ht,
- (void *)((unsigned long) key->pid), sizeof(void *), &iter);
- if (node == NULL) {
- DBG2("UST app find by sock %d not found", sock);
- rcu_read_unlock();
- goto error;
+ if (ua_event->obj != NULL) {
+ ustctl_release_object(sock, ua_event->obj);
+ free(ua_event->obj);
}
- rcu_read_unlock();
-
- return caa_container_of(node, struct ust_app, node);
-
-error:
- return NULL;
+ free(ua_event);
}
/*
- * Return pointer to traceable apps list.
+ * Delete ust app stream safely. RCU read lock must be held before calling
+ * this function.
*/
-struct cds_lfht *ust_app_get_ht(void)
+static
+void delete_ust_app_stream(int sock, struct ltt_ust_stream *stream)
{
- return ust_app_ht;
+ if (stream->obj) {
+ ustctl_release_object(sock, stream->obj);
+ free(stream->obj);
+ }
+ free(stream);
}
/*
- * Return ust app pointer or NULL if not found.
+ * Delete ust app channel safely. RCU read lock must be held before calling
+ * this function.
*/
-struct ust_app *ust_app_find_by_pid(pid_t pid)
+static
+void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan)
{
- struct cds_lfht_node *node;
+ int ret;
struct cds_lfht_iter iter;
+ struct ust_app_event *ua_event;
+ struct ust_app_ctx *ua_ctx;
+ struct ltt_ust_stream *stream, *stmp;
- rcu_read_lock();
- node = hashtable_lookup(ust_app_ht,
- (void *)((unsigned long) pid), sizeof(void *), &iter);
- if (node == NULL) {
- rcu_read_unlock();
- DBG2("UST app no found with pid %d", pid);
- goto error;
+ /* Wipe stream */
+ cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) {
+ cds_list_del(&stream->list);
+ delete_ust_app_stream(sock, stream);
}
- rcu_read_unlock();
-
- DBG2("Found UST app by pid %d", pid);
- return caa_container_of(node, struct ust_app, node);
+ /* Wipe context */
+ cds_lfht_for_each_entry(ua_chan->ctx, &iter, ua_ctx, node) {
+ ret = hashtable_del(ua_chan->ctx, &iter);
+ assert(!ret);
+ delete_ust_app_ctx(sock, ua_ctx);
+ }
+ ret = hashtable_destroy(ua_chan->ctx);
+ assert(!ret);
+
+ /* Wipe events */
+ cds_lfht_for_each_entry(ua_chan->events, &iter, ua_event, node) {
+ ret = hashtable_del(ua_chan->events, &iter);
+ assert(!ret);
+ delete_ust_app_event(sock, ua_event);
+ }
+ ret = hashtable_destroy(ua_chan->events);
+ assert(!ret);
-error:
- return NULL;
+ if (ua_chan->obj != NULL) {
+ ustctl_release_object(sock, ua_chan->obj);
+ free(ua_chan->obj);
+ }
+ free(ua_chan);
}
/*
- * Using pid and uid (of the app), allocate a new ust_app struct and
- * add it to the global traceable app list.
- *
- * On success, return 0, else return malloc ENOMEM.
+ * Delete ust app session safely. RCU read lock must be held before calling
+ * this function.
*/
-int ust_app_register(struct ust_register_msg *msg, int sock)
+static
+void delete_ust_app_session(int sock, struct ust_app_session *ua_sess)
{
- struct ust_app *lta;
+ int ret;
+ struct cds_lfht_iter iter;
+ struct ust_app_channel *ua_chan;
- lta = malloc(sizeof(struct ust_app));
- if (lta == NULL) {
- PERROR("malloc");
- return -ENOMEM;
+ 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);
+ }
}
- lta->uid = msg->uid;
- lta->gid = msg->gid;
- lta->key.pid = msg->pid;
- lta->ppid = msg->ppid;
- lta->v_major = msg->major;
- lta->v_minor = msg->minor;
- lta->key.sock = sock;
- strncpy(lta->name, msg->name, sizeof(lta->name));
- lta->name[16] = '\0';
- hashtable_node_init(<a->node, (void *)((unsigned long)lta->key.pid),
- sizeof(void *));
-
- /* Session hashtable */
- lta->sessions = hashtable_new(0);
-
- /* Set sock key map */
- hashtable_node_init(<a->key.node, (void *)((unsigned long)lta->key.sock),
- sizeof(void *));
-
- rcu_read_lock();
- hashtable_add_unique(ust_app_ht, <a->node);
- hashtable_add_unique(ust_app_sock_key_map, <a->key.node);
- 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);
-
- return 0;
-}
-
-/*
- * Unregister app by removing it from the global traceable app list and freeing
- * the data struct.
- *
- * The socket is already closed at this point so no close to sock.
- */
-void ust_app_unregister(int sock)
-{
- struct ust_app *lta;
-
- DBG2("UST app unregistering sock %d", sock);
+ cds_lfht_for_each_entry(ua_sess->channels, &iter, ua_chan, node) {
+ ret = hashtable_del(ua_sess->channels, &iter);
+ assert(!ret);
+ delete_ust_app_channel(sock, ua_chan);
+ }
+ ret = hashtable_destroy(ua_sess->channels);
+ assert(!ret);
- lta = find_app_by_sock(sock);
- if (lta) {
- DBG("PID %d unregistering with sock %d", lta->key.pid, sock);
- /* FIXME: Better use a call_rcu here ? */
- delete_ust_app(lta);
+ if (ua_sess->handle != -1) {
+ ustctl_release_handle(sock, ua_sess->handle);
}
+ free(ua_sess);
}
/*
- * Return traceable_app_count
+ * Delete a traceable application structure from the global list. Never call
+ * this function outside of a call_rcu call.
*/
-unsigned long ust_app_list_count(void)
+static
+void delete_ust_app(struct ust_app *app)
{
- unsigned long count;
+ int ret, sock;
+ struct cds_lfht_node *node;
+ struct cds_lfht_iter iter;
+ struct ust_app_session *ua_sess;
rcu_read_lock();
- count = hashtable_get_count(ust_app_ht);
- rcu_read_unlock();
- return count;
-}
+ /* Remove from key hash table */
+ node = hashtable_lookup(ust_app_sock_key_map,
+ (void *) ((unsigned long) app->key.sock), sizeof(void *), &iter);
+ if (node == NULL) {
+ /* Not suppose to happen */
+ ERR("UST app key %d not found in key hash table", app->key.sock);
+ goto end;
+ }
-/*
- * Free and clean all traceable apps of the global list.
- */
-void ust_app_clean_list(void)
-{
- int ret;
- struct cds_lfht_node *node;
- struct cds_lfht_iter iter;
+ ret = hashtable_del(ust_app_sock_key_map, &iter);
+ if (ret) {
+ ERR("UST app unable to delete app sock %d from key hash table",
+ app->key.sock);
+ } else {
+ DBG2("UST app pair sock %d key %d deleted",
+ app->key.sock, app->key.pid);
+ }
- DBG2("UST app clean hash table");
+ /* Socket is already closed at this point */
- rcu_read_lock();
+ /* Delete ust app sessions info */
+ sock = app->key.sock;
+ app->key.sock = -1;
- hashtable_get_first(ust_app_ht, &iter);
- while ((node = hashtable_iter_get_node(&iter)) != NULL) {
- ret = hashtable_del(ust_app_ht, &iter);
- if (!ret) {
- call_rcu(&node->head, delete_ust_app_rcu);
- }
- hashtable_get_next(ust_app_ht, &iter);
+ /* Wipe sessions */
+ cds_lfht_for_each_entry(app->sessions, &iter, ua_sess, node) {
+ ret = hashtable_del(app->sessions, &iter);
+ assert(!ret);
+ delete_ust_app_session(app->key.sock, ua_sess);
}
-
+ ret = hashtable_destroy(app->sessions);
+ assert(!ret);
+
+ /*
+ * 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.
+ */
+ close(sock);
+
+ DBG2("UST app pid %d deleted", app->key.pid);
+ free(app);
+end:
rcu_read_unlock();
}
/*
- * Init UST app hash table.
+ * URCU intermediate call to delete an UST app.
*/
-void ust_app_ht_alloc(void)
+static
+void delete_ust_app_rcu(struct rcu_head *head)
{
- ust_app_ht = hashtable_new(0);
- ust_app_sock_key_map = hashtable_new(0);
+ struct cds_lfht_node *node =
+ caa_container_of(head, struct cds_lfht_node, head);
+ struct ust_app *app =
+ caa_container_of(node, struct ust_app, node);
+
+ delete_ust_app(app);
}
/*
* Alloc new UST app session.
*/
-static struct ust_app_session *alloc_app_session(void)
+static
+struct ust_app_session *alloc_ust_app_session(void)
{
struct ust_app_session *ua_sess;
+ /* Init most of the default value by allocating and zeroing */
ua_sess = zmalloc(sizeof(struct ust_app_session));
if (ua_sess == NULL) {
PERROR("malloc");
goto error;
}
- ua_sess->enabled = 0;
ua_sess->handle = -1;
ua_sess->channels = hashtable_new_str(0);
- ua_sess->metadata = NULL;
- ua_sess->obj = NULL;
return ua_sess;
return NULL;
}
-static struct ust_app_channel *alloc_app_channel(char *name)
+/*
+ * Alloc new UST app channel.
+ */
+static
+struct ust_app_channel *alloc_ust_app_channel(char *name,
+ struct lttng_ust_channel *attr)
{
struct ust_app_channel *ua_chan;
+ /* Init most of the default value by allocating and zeroing */
ua_chan = zmalloc(sizeof(struct ust_app_channel));
if (ua_chan == NULL) {
PERROR("malloc");
goto error;
}
+ /* Setup channel name */
strncpy(ua_chan->name, name, sizeof(ua_chan->name));
ua_chan->name[sizeof(ua_chan->name) - 1] = '\0';
- ua_chan->enabled = 0;
+
+ ua_chan->enabled = 1;
ua_chan->handle = -1;
- ua_chan->obj = NULL;
ua_chan->ctx = hashtable_new(0);
- CDS_INIT_LIST_HEAD(&ua_chan->streams.head);
ua_chan->events = hashtable_new_str(0);
hashtable_node_init(&ua_chan->node, (void *) ua_chan->name,
strlen(ua_chan->name));
+ CDS_INIT_LIST_HEAD(&ua_chan->streams.head);
+
+ /* Copy attributes */
+ if (attr) {
+ memcpy(&ua_chan->attr, attr, sizeof(ua_chan->attr));
+ }
+
DBG3("UST app channel %s allocated", ua_chan->name);
return ua_chan;
return NULL;
}
-static struct ust_app_event *alloc_app_event(char *name)
+/*
+ * Alloc new UST app event.
+ */
+static
+struct ust_app_event *alloc_ust_app_event(char *name,
+ struct lttng_ust_event *attr)
{
struct ust_app_event *ua_event;
+ /* Init most of the default value by allocating and zeroing */
ua_event = zmalloc(sizeof(struct ust_app_event));
if (ua_event == NULL) {
PERROR("malloc");
goto error;
}
+ 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 = hashtable_new(0);
hashtable_node_init(&ua_event->node, (void *) ua_event->name,
strlen(ua_event->name));
+ /* Copy attributes */
+ if (attr) {
+ memcpy(&ua_event->attr, attr, sizeof(ua_event->attr));
+ }
+
DBG3("UST app event %s allocated", ua_event->name);
return ua_event;
return NULL;
}
-static void shallow_copy_event(struct ust_app_event *ua_event,
- struct ltt_ust_event *uevent)
+/*
+ * Alloc new UST app context.
+ */
+static
+struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context *uctx)
{
- strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name));
- ua_event->name[sizeof(ua_event->name) - 1] = '\0';
-
- /* TODO: support copy context */
-}
+ struct ust_app_ctx *ua_ctx;
-static void shallow_copy_channel(struct ust_app_channel *ua_chan,
- struct ltt_ust_channel *uchan)
-{
- struct cds_lfht_iter iter;
- struct cds_lfht_node *node, *ua_event_node;
- struct ltt_ust_event *uevent;
- struct ust_app_event *ua_event;
+ ua_ctx = zmalloc(sizeof(struct ust_app_ctx));
+ if (ua_ctx == NULL) {
+ goto error;
+ }
- DBG2("Shallow copy of UST app channel %s", ua_chan->name);
+ if (uctx) {
+ memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx));
+ }
- strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name));
- ua_chan->name[sizeof(ua_chan->name) - 1] = '\0';
+ DBG3("UST app context %d allocated", ua_ctx->ctx.ctx);
- /* TODO: support copy context */
+error:
+ return ua_ctx;
+}
- hashtable_get_first(uchan->events, &iter);
- while ((node = hashtable_iter_get_node(&iter)) != NULL) {
- uevent = caa_container_of(node, struct ltt_ust_event, node);
+/*
+ * Find an ust_app using the sock and return it. RCU read side lock must be
+ * held before calling this helper function.
+ */
+static
+struct ust_app *find_app_by_sock(int sock)
+{
+ struct cds_lfht_node *node;
+ struct ust_app_key *key;
+ struct cds_lfht_iter iter;
- ua_event_node = hashtable_lookup(ua_chan->events,
- (void *) uevent->attr.name, strlen(uevent->attr.name), &iter);
- if (ua_event_node == NULL) {
- DBG2("UST event %s not found on shallow copy channel",
- uevent->attr.name);
- ua_event = alloc_app_event(uevent->attr.name);
- if (ua_event == NULL) {
- continue;
- }
- hashtable_add_unique(ua_chan->events, &ua_event->node);
- } else {
- ua_event = caa_container_of(node, struct ust_app_event, node);
- }
+ node = hashtable_lookup(ust_app_sock_key_map,
+ (void *)((unsigned long) sock), sizeof(void *), &iter);
+ if (node == NULL) {
+ DBG2("UST app find by sock %d key not found", sock);
+ goto error;
+ }
- shallow_copy_event(ua_event, uevent);
+ key = caa_container_of(node, struct ust_app_key, node);
- /* Get next UST events */
- hashtable_get_next(uchan->events, &iter);
+ node = hashtable_lookup(ust_app_ht,
+ (void *)((unsigned long) key->pid), sizeof(void *), &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);
- DBG3("Shallow copy channel done");
+error:
+ return NULL;
}
-static void shallow_copy_session(struct ust_app_session *ua_sess,
- struct ltt_ust_session *usess)
+/*
+ * Create the channel context on the tracer.
+ */
+static
+int create_ust_channel_context(struct ust_app_channel *ua_chan,
+ struct ust_app_ctx *ua_ctx, struct ust_app *app)
{
- struct cds_lfht_node *node, *ua_chan_node;
- struct cds_lfht_iter iter;
- struct ltt_ust_channel *uchan;
- struct ust_app_channel *ua_chan;
+ int ret;
- DBG2("Shallow copy of session handle");
+ ret = ustctl_add_context(app->key.sock, &ua_ctx->ctx,
+ ua_chan->obj, &ua_ctx->obj);
+ if (ret < 0) {
+ goto error;
+ }
- ua_sess->uid = usess->uid;
+ ua_ctx->handle = ua_ctx->obj->handle;
- /* TODO: support all UST domain */
+ DBG2("UST app context added to channel %s successfully", ua_chan->name);
- /* Iterate over all channels in global domain. */
- hashtable_get_first(usess->domain_global.channels, &iter);
- while ((node = hashtable_iter_get_node(&iter)) != NULL) {
- uchan = caa_container_of(node, struct ltt_ust_channel, node);
+error:
+ return ret;
+}
- ua_chan_node = hashtable_lookup(ua_sess->channels,
- (void *) uchan->name, strlen(uchan->name), &iter);
- if (ua_chan_node == NULL) {
- DBG2("Channel %s not found on shallow session copy, creating it",
- uchan->name);
- ua_chan = alloc_app_channel(uchan->name);
- if (ua_chan == NULL) {
- /* malloc failed... continuing */
+/*
+ * Create the event context 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 ret;
+
+ ret = ustctl_add_context(app->key.sock, &ua_ctx->ctx,
+ ua_event->obj, &ua_ctx->obj);
+ if (ret < 0) {
+ goto error;
+ }
+
+ ua_ctx->handle = ua_ctx->obj->handle;
+
+ DBG2("UST app context added to event %s successfully", ua_event->name);
+
+error:
+ return ret;
+}
+
+/*
+ * Disable the specified event on to UST tracer for the UST session.
+ */
+static int disable_ust_event(struct ust_app *app,
+ struct ust_app_session *ua_sess, struct ust_app_event *ua_event)
+{
+ int ret;
+
+ ret = ustctl_disable(app->key.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);
+ goto error;
+ }
+
+ DBG2("UST app event %s disabled successfully for app (pid: %d)",
+ ua_event->attr.name, app->key.pid);
+
+error:
+ return ret;
+}
+
+/*
+ * Disable the specified channel on to UST tracer for the UST session.
+ */
+static int disable_ust_channel(struct ust_app *app,
+ struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
+{
+ int ret;
+
+ ret = ustctl_disable(app->key.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);
+ goto error;
+ }
+
+ DBG2("UST app channel %s disabled successfully for app (pid: %d)",
+ ua_chan->name, app->key.pid);
+
+error:
+ return ret;
+}
+
+/*
+ * Enable the specified channel on to UST tracer for the UST session.
+ */
+static int enable_ust_channel(struct ust_app *app,
+ struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
+{
+ int ret;
+
+ ret = ustctl_enable(app->key.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);
+ goto error;
+ }
+
+ ua_chan->enabled = 1;
+
+ DBG2("UST app channel %s enabled successfully for app (pid: %d)",
+ ua_chan->name, app->key.pid);
+
+error:
+ return ret;
+}
+
+/*
+ * Enable the specified event on to UST tracer for the UST session.
+ */
+static int enable_ust_event(struct ust_app *app,
+ struct ust_app_session *ua_sess, struct ust_app_event *ua_event)
+{
+ int ret;
+
+ ret = ustctl_enable(app->key.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);
+ goto error;
+ }
+
+ DBG2("UST app event %s enabled successfully for app (pid: %d)",
+ ua_event->attr.name, app->key.pid);
+
+error:
+ return ret;
+}
+
+/*
+ * Open metadata onto the UST tracer for a UST session.
+ */
+static int open_ust_metadata(struct ust_app *app,
+ struct ust_app_session *ua_sess)
+{
+ 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",
+ app->key.pid);
+ goto error;
+ }
+
+ ua_sess->metadata->handle = ua_sess->metadata->obj->handle;
+
+error:
+ return ret;
+}
+
+/*
+ * 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;
+
+ ret = ustctl_create_stream(app->key.sock, ua_sess->metadata->obj,
+ &ua_sess->metadata->stream_obj);
+ if (ret < 0) {
+ ERR("UST create metadata stream failed");
+ goto error;
+ }
+
+error:
+ return ret;
+}
+
+/*
+ * 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;
+
+ /* 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);
+ if (ret < 0) {
+ DBG("Error 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;
+ ua_chan->attr.shm_fd = ua_chan->obj->shm_fd;
+ ua_chan->attr.wait_fd = ua_chan->obj->wait_fd;
+ ua_chan->attr.memory_map_size = ua_chan->obj->memory_map_size;
+
+ DBG2("UST app channel %s created successfully for pid:%d and sock:%d",
+ ua_chan->name, app->key.pid, app->key.sock);
+
+ /* If channel is not enabled, disable it on the tracer */
+ if (!ua_chan->enabled) {
+ ret = disable_ust_channel(app, ua_sess, ua_chan);
+ if (ret < 0) {
+ goto error;
+ }
+ }
+
+error:
+ return ret;
+}
+
+/*
+ * Create the specified event onto the UST tracer for a UST session.
+ */
+static
+int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess,
+ struct ust_app_channel *ua_chan, struct ust_app_event *ua_event)
+{
+ int ret = 0;
+
+ /* Create UST event on tracer */
+ ret = ustctl_create_event(app->key.sock, &ua_event->attr, ua_chan->obj,
+ &ua_event->obj);
+ if (ret < 0) {
+ 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);
+
+ /* If event not enabled, disable it on the tracer */
+ if (!ua_event->enabled) {
+ ret = disable_ust_event(app, ua_sess, ua_event);
+ if (ret < 0) {
+ goto error;
+ }
+ }
+
+error:
+ return ret;
+}
+
+/*
+ * Copy data between an UST app event and a LTT event.
+ */
+static void shadow_copy_event(struct ust_app_event *ua_event,
+ struct ltt_ust_event *uevent)
+{
+ struct cds_lfht_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, &iter, uctx, node) {
+ ua_ctx = alloc_ust_app_ctx(&uctx->ctx);
+ if (ua_ctx == NULL) {
+ continue;
+ }
+ hashtable_node_init(&ua_ctx->node,
+ (void *)((unsigned long) ua_ctx->ctx.ctx), sizeof(void *));
+ hashtable_add_unique(ua_event->ctx, &ua_ctx->node);
+ }
+}
+
+/*
+ * Copy data between an UST app channel and a LTT channel.
+ */
+static void shadow_copy_channel(struct ust_app_channel *ua_chan,
+ struct ltt_ust_channel *uchan)
+{
+ struct cds_lfht_iter iter;
+ struct cds_lfht_node *ua_event_node;
+ struct ltt_ust_event *uevent;
+ struct ltt_ust_context *uctx;
+ struct ust_app_event *ua_event;
+ struct ust_app_ctx *ua_ctx;
+
+ DBG2("Shadow copy of UST app channel %s", ua_chan->name);
+
+ 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));
+
+ cds_lfht_for_each_entry(uchan->ctx, &iter, uctx, node) {
+ ua_ctx = alloc_ust_app_ctx(&uctx->ctx);
+ if (ua_ctx == NULL) {
+ continue;
+ }
+ hashtable_node_init(&ua_ctx->node,
+ (void *)((unsigned long) ua_ctx->ctx.ctx), sizeof(void *));
+ hashtable_add_unique(ua_chan->ctx, &ua_ctx->node);
+ }
+
+ /* Copy all events from ltt ust channel to ust app channel */
+ cds_lfht_for_each_entry(uchan->events, &iter, uevent, node) {
+ struct cds_lfht_iter uiter;
+
+ ua_event_node = hashtable_lookup(ua_chan->events,
+ (void *) uevent->attr.name, strlen(uevent->attr.name),
+ &uiter);
+ if (ua_event_node == 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);
+ if (ua_event == NULL) {
continue;
}
- hashtable_add_unique(ua_sess->channels, &ua_chan->node);
- } else {
- ua_chan = caa_container_of(node, struct ust_app_channel, node);
+ shadow_copy_event(ua_event, uevent);
+ hashtable_add_unique(ua_chan->events, &ua_event->node);
+ }
+ }
+
+ DBG3("Shadow copy channel done");
+}
+
+/*
+ * Copy data between a UST app session and a regular LTT session.
+ */
+static void shadow_copy_session(struct ust_app_session *ua_sess,
+ struct ltt_ust_session *usess,
+ struct ust_app *app)
+{
+ struct cds_lfht_node *ua_chan_node;
+ struct cds_lfht_iter iter;
+ struct ltt_ust_channel *uchan;
+ struct ust_app_channel *ua_chan;
+ time_t rawtime;
+ struct tm *timeinfo;
+ char datetime[16];
+ int ret;
+
+ /* Get date and time for unique app path */
+ time(&rawtime);
+ timeinfo = localtime(&rawtime);
+ strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo);
+
+ DBG2("Shadow copy of session handle %d", ua_sess->handle);
+
+ ua_sess->uid = usess->uid;
+
+ ret = snprintf(ua_sess->path, PATH_MAX,
+ "%s/%s-%d-%s",
+ usess->pathname, app->name, app->key.pid,
+ datetime);
+ if (ret < 0) {
+ PERROR("asprintf UST shadow copy session");
+ /* TODO: We cannot return an error from here.. */
+ assert(0);
+ }
+
+ /* TODO: support all UST domain */
+
+ /* Iterate over all channels in global domain. */
+ cds_lfht_for_each_entry(usess->domain_global.channels, &iter,
+ uchan, node) {
+ struct cds_lfht_iter uiter;
+
+ ua_chan_node = hashtable_lookup(ua_sess->channels,
+ (void *)uchan->name, strlen(uchan->name),
+ &uiter);
+ if (ua_chan_node != NULL) {
+ continue;
}
- shallow_copy_channel(ua_chan, uchan);
+ DBG2("Channel %s not found on shadow session copy, creating it",
+ uchan->name);
+ ua_chan = alloc_ust_app_channel(uchan->name, &uchan->attr);
+ if (ua_chan == NULL) {
+ /* malloc failed... continuing */
+ continue;
+ }
- /* Next item in hash table */
- hashtable_get_next(usess->domain_global.channels, &iter);
+ shadow_copy_channel(ua_chan, uchan);
+ hashtable_add_unique(ua_sess->channels, &ua_chan->node);
}
}
+/*
+ * Lookup sesison wrapper.
+ */
+static
+void __lookup_session_by_app(struct ltt_ust_session *usess,
+ struct ust_app *app, struct cds_lfht_iter *iter)
+{
+ /* Get right UST app session from app */
+ (void) hashtable_lookup(app->sessions,
+ (void *) ((unsigned long) usess->uid), sizeof(void *),
+ iter);
+}
+
+/*
+ * Return ust app session from the app session hashtable using the UST session
+ * uid.
+ */
static struct ust_app_session *lookup_session_by_app(
struct ltt_ust_session *usess, struct ust_app *app)
{
struct cds_lfht_iter iter;
struct cds_lfht_node *node;
- /* Get right UST app session from app */
- node = hashtable_lookup(app->sessions,
- (void *) ((unsigned long) usess->uid),
- sizeof(void *), &iter);
+ __lookup_session_by_app(usess, app, &iter);
+ node = hashtable_iter_get_node(&iter);
+ if (node == NULL) {
+ goto error;
+ }
+
+ return caa_container_of(node, struct ust_app_session, node);
+
+error:
+ return NULL;
+}
+
+/*
+ * Create a UST session onto the tracer of app and add it the session
+ * hashtable.
+ *
+ * Return ust app session or NULL on error.
+ */
+static struct ust_app_session *create_ust_app_session(
+ struct ltt_ust_session *usess, struct ust_app *app)
+{
+ int ret;
+ struct ust_app_session *ua_sess;
+
+ ua_sess = lookup_session_by_app(usess, app);
+ if (ua_sess == NULL) {
+ DBG2("UST app pid: %d session uid %d not found, creating it",
+ app->key.pid, usess->uid);
+ ua_sess = alloc_ust_app_session();
+ if (ua_sess == NULL) {
+ /* Only malloc can failed so something is really wrong */
+ goto error;
+ }
+ shadow_copy_session(ua_sess, usess, app);
+ }
+
+ if (ua_sess->handle == -1) {
+ ret = ustctl_create_session(app->key.sock);
+ if (ret < 0) {
+ ERR("Error creating session for app pid %d, sock %d",
+ app->key.pid, app->key.sock);
+ /* TODO: free() ua_sess */
+ goto error;
+ }
+
+ DBG2("UST app ustctl create session handle %d", ret);
+ ua_sess->handle = ret;
+
+ /* Add ust app session to app's HT */
+ hashtable_node_init(&ua_sess->node,
+ (void *)((unsigned long) ua_sess->uid), sizeof(void *));
+ hashtable_add_unique(app->sessions, &ua_sess->node);
+
+ DBG2("UST app session created successfully with handle %d", ret);
+ }
+
+ return ua_sess;
+
+error:
+ return NULL;
+}
+
+/*
+ * Create a context for the channel on the tracer.
+ */
+static
+int create_ust_app_channel_context(struct ust_app_session *ua_sess,
+ struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx,
+ struct ust_app *app)
+{
+ int ret = 0;
+ struct cds_lfht_iter iter;
+ struct cds_lfht_node *node;
+ struct ust_app_ctx *ua_ctx;
+
+ DBG2("UST app adding context to channel %s", ua_chan->name);
+
+ node = hashtable_lookup(ua_chan->ctx, (void *)((unsigned long)uctx->ctx),
+ sizeof(void *), &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;
+ }
+
+ hashtable_node_init(&ua_ctx->node,
+ (void *)((unsigned long) ua_ctx->ctx.ctx), sizeof(void *));
+ hashtable_add_unique(ua_chan->ctx, &ua_ctx->node);
+
+ ret = create_ust_channel_context(ua_chan, ua_ctx, app);
+ if (ret < 0) {
+ goto error;
+ }
+
+error:
+ 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 cds_lfht_iter iter;
+ struct cds_lfht_node *node;
+ struct ust_app_ctx *ua_ctx;
+
+ DBG2("UST app adding context to event %s", ua_event->name);
+
+ node = hashtable_lookup(ua_event->ctx, (void *)((unsigned long)uctx->ctx),
+ sizeof(void *), &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;
+ }
+
+ hashtable_node_init(&ua_ctx->node,
+ (void *)((unsigned long) ua_ctx->ctx.ctx), sizeof(void *));
+ hashtable_add_unique(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.
+ */
+static
+int enable_ust_app_event(struct ust_app_session *ua_sess,
+ struct ust_app_event *ua_event, struct ust_app *app)
+{
+ int ret;
+
+ ret = enable_ust_event(app, ua_sess, ua_event);
+ if (ret < 0) {
+ goto error;
+ }
+
+ ua_event->enabled = 1;
+
+error:
+ return ret;
+}
+
+/*
+ * Disable on the tracer side a ust app event for the session and channel.
+ */
+static int disable_ust_app_event(struct ust_app_session *ua_sess,
+ struct ust_app_event *ua_event, struct ust_app *app)
+{
+ int ret;
+
+ ret = disable_ust_event(app, ua_sess, ua_event);
+ if (ret < 0) {
+ goto error;
+ }
+
+ ua_event->enabled = 0;
+
+error:
+ return ret;
+}
+
+/*
+ * Lookup ust app channel for session and disable it on the tracer side.
+ */
+static
+int disable_ust_app_channel(struct ust_app_session *ua_sess,
+ struct ust_app_channel *ua_chan, struct ust_app *app)
+{
+ int ret;
+
+ ret = disable_ust_channel(app, ua_sess, ua_chan);
+ if (ret < 0) {
+ goto error;
+ }
+
+ ua_chan->enabled = 0;
+
+error:
+ return ret;
+}
+
+/*
+ * Lookup ust app channel for session and enable it on the tracer side.
+ */
+static int enable_ust_app_channel(struct ust_app_session *ua_sess,
+ struct ltt_ust_channel *uchan, struct ust_app *app)
+{
+ int ret = 0;
+ struct cds_lfht_iter iter;
+ struct cds_lfht_node *ua_chan_node;
+ struct ust_app_channel *ua_chan;
+
+ ua_chan_node = hashtable_lookup(ua_sess->channels,
+ (void *)uchan->name, strlen(uchan->name), &iter);
+ if (ua_chan_node == NULL) {
+ DBG2("Unable to find channel %s in ust session uid %u",
+ uchan->name, ua_sess->uid);
+ goto error;
+ }
+
+ ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
+
+ ret = enable_ust_channel(app, ua_sess, ua_chan);
+ if (ret < 0) {
+ goto error;
+ }
+
+error:
+ return ret;
+}
+
+/*
+ * Create UST app channel and create it on the tracer.
+ */
+static struct ust_app_channel *create_ust_app_channel(
+ struct ust_app_session *ua_sess, struct ltt_ust_channel *uchan,
+ struct ust_app *app)
+{
+ int ret = 0;
+ struct cds_lfht_iter iter;
+ struct cds_lfht_node *ua_chan_node;
+ struct ust_app_channel *ua_chan;
+
+ /* Lookup channel in the ust app session */
+ ua_chan_node = hashtable_lookup(ua_sess->channels,
+ (void *)uchan->name, strlen(uchan->name), &iter);
+ if (ua_chan_node == NULL) {
+ DBG2("Unable to find channel %s in ust session uid %u",
+ uchan->name, ua_sess->uid);
+ ua_chan = alloc_ust_app_channel(uchan->name, &uchan->attr);
+ if (ua_chan == NULL) {
+ goto error;
+ }
+ shadow_copy_channel(ua_chan, uchan);
+
+ hashtable_add_unique(ua_sess->channels, &ua_chan->node);
+ } else {
+ ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
+ }
+
+ ret = create_ust_channel(app, ua_sess, ua_chan);
+ if (ret < 0) {
+ goto error;
+ }
+
+ return ua_chan;
+
+error:
+ return NULL;
+}
+
+/*
+ * Create UST app event and create it on the tracer side.
+ */
+static
+int create_ust_app_event(struct ust_app_session *ua_sess,
+ struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent,
+ struct ust_app *app)
+{
+ int ret = 0;
+ struct cds_lfht_iter iter;
+ struct cds_lfht_node *ua_event_node;
+ struct ust_app_event *ua_event;
+
+ /* Get event node */
+ ua_event_node = hashtable_lookup(ua_chan->events,
+ (void *)uevent->attr.name, strlen(uevent->attr.name), &iter);
+ if (ua_event_node != NULL) {
+ ERR("UST app event %s already exist. Stopping creation.",
+ uevent->attr.name);
+ goto end;
+ }
+
+ /* Does not exist so create one */
+ ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
+ if (ua_event == NULL) {
+ /* Only malloc can failed so something is really wrong */
+ ret = -ENOMEM;
+ goto error;
+ }
+ shadow_copy_event(ua_event, uevent);
+
+ /* Create it on the tracer side */
+ ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
+ if (ret < 0) {
+ rcu_read_lock();
+ delete_ust_app_event(app->key.sock, ua_event);
+ rcu_read_unlock();
+ goto error;
+ }
+
+ ua_event->enabled = 1;
+
+ hashtable_add_unique(ua_chan->events, &ua_event->node);
+
+ DBG2("UST app create event %s for PID %d completed",
+ ua_event->name, app->key.pid);
+
+end:
+error:
+ 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)
+{
+ int ret = 0;
+ mode_t old_umask;
+
+ if (ua_sess->metadata == NULL) {
+ /* Allocate UST metadata */
+ ua_sess->metadata = trace_ust_create_metadata(pathname);
+ if (ua_sess->metadata == NULL) {
+ ERR("UST app session %d creating metadata failed",
+ ua_sess->handle);
+ goto error;
+ }
+
+ ret = open_ust_metadata(app, ua_sess);
+ if (ret < 0) {
+ goto error;
+ }
+
+ DBG2("UST metadata opened for app pid %d", app->key.pid);
+ }
+
+ /* Open UST metadata stream */
+ if (ua_sess->metadata->stream_obj == NULL) {
+ ret = create_ust_stream(app, ua_sess);
+ if (ret < 0) {
+ goto error;
+ }
+
+ old_umask = umask(0);
+ ret = mkdir(ua_sess->path, S_IRWXU | S_IRWXG);
+ if (ret < 0) {
+ PERROR("mkdir UST metadata");
+ goto error;
+ }
+ umask(old_umask);
+
+ ret = snprintf(ua_sess->metadata->pathname, PATH_MAX,
+ "%s/metadata", ua_sess->path);
+ if (ret < 0) {
+ PERROR("asprintf UST create stream");
+ goto error;
+ }
+
+ DBG2("UST metadata stream object created for app pid %d",
+ app->key.pid);
+ } else {
+ ERR("Attempting to create stream without metadata opened");
+ goto error;
+ }
+
+ return 0;
+
+error:
+ return -1;
+}
+
+/*
+ * Return pointer to traceable apps list.
+ */
+struct cds_lfht *ust_app_get_ht(void)
+{
+ return ust_app_ht;
+}
+
+/*
+ * Return ust app pointer or NULL if not found.
+ */
+struct ust_app *ust_app_find_by_pid(pid_t pid)
+{
+ struct cds_lfht_node *node;
+ struct cds_lfht_iter iter;
+
+ rcu_read_lock();
+ node = hashtable_lookup(ust_app_ht,
+ (void *)((unsigned long) pid), sizeof(void *), &iter);
+ if (node == NULL) {
+ DBG2("UST app no found with pid %d", pid);
+ goto error;
+ }
+ rcu_read_unlock();
+
+ DBG2("Found UST app by pid %d", pid);
+
+ return caa_container_of(node, struct ust_app, node);
+
+error:
+ rcu_read_unlock();
+ return NULL;
+}
+
+/*
+ * Using pid and uid (of the app), allocate a new ust_app struct and
+ * add it to the global traceable app list.
+ *
+ * On success, return 0, else return malloc -ENOMEM, or -EINVAL if app
+ * bitness is not supported.
+ */
+int ust_app_register(struct ust_register_msg *msg, int sock)
+{
+ struct ust_app *lta;
+
+ if ((msg->bits_per_long == 64 && ust_consumerd64_fd == -EINVAL)
+ || (msg->bits_per_long == 32 && 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);
+ close(sock);
+ return -EINVAL;
+ }
+ lta = zmalloc(sizeof(struct ust_app));
+ if (lta == NULL) {
+ PERROR("malloc");
+ return -ENOMEM;
+ }
+
+ lta->ppid = msg->ppid;
+ lta->uid = msg->uid;
+ lta->gid = msg->gid;
+ lta->bits_per_long = msg->bits_per_long;
+ lta->v_major = msg->major;
+ lta->v_minor = msg->minor;
+ strncpy(lta->name, msg->name, sizeof(lta->name));
+ lta->name[16] = '\0';
+ lta->sessions = hashtable_new(0);
+
+ /* Set key map */
+ lta->key.pid = msg->pid;
+ hashtable_node_init(<a->node, (void *)((unsigned long)lta->key.pid),
+ sizeof(void *));
+ lta->key.sock = sock;
+ hashtable_node_init(<a->key.node, (void *)((unsigned long)lta->key.sock),
+ sizeof(void *));
+
+ rcu_read_lock();
+ hashtable_add_unique(ust_app_sock_key_map, <a->key.node);
+ hashtable_add_unique(ust_app_ht, <a->node);
+ 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);
+
+ return 0;
+}
+
+/*
+ * Unregister app by removing it from the global traceable app list and freeing
+ * the data struct.
+ *
+ * The socket is already closed at this point so no close to sock.
+ */
+void ust_app_unregister(int sock)
+{
+ struct ust_app *lta;
+ struct cds_lfht_node *node;
+ struct cds_lfht_iter iter;
+ int ret;
+
+ rcu_read_lock();
+ lta = find_app_by_sock(sock);
+ if (lta == NULL) {
+ ERR("Unregister app sock %d not found!", sock);
+ goto error;
+ }
+
+ DBG("PID %d unregistering with sock %d", lta->key.pid, sock);
+
+ /* Get the node reference for a call_rcu */
+ node = hashtable_lookup(ust_app_ht,
+ (void *)((unsigned long) lta->key.pid), sizeof(void *), &iter);
+ if (node == NULL) {
+ ERR("Unable to find app sock %d by pid %d", sock, lta->key.pid);
+ goto error;
+ }
+
+ ret = hashtable_del(ust_app_ht, &iter);
+ assert(!ret);
+ call_rcu(&node->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 = hashtable_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 cds_lfht_iter iter;
+ struct ust_app *app;
+ struct lttng_event *tmp;
+
+ nbmem = UST_APP_EVENT_LIST_SIZE;
+ tmp = zmalloc(nbmem * sizeof(struct lttng_event));
+ if (tmp == NULL) {
+ PERROR("zmalloc ust app events");
+ ret = -ENOMEM;
+ goto error;
+ }
+
+ rcu_read_lock();
+
+ cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
+ struct lttng_ust_tracepoint_iter iter;
+
+ handle = ustctl_tracepoint_list(app->key.sock);
+ if (handle < 0) {
+ ERR("UST app list events getting handle failed for app pid %d",
+ app->key.pid);
+ continue;
+ }
+
+ while ((ret = ustctl_tracepoint_list_get(app->key.sock, handle,
+ &iter)) != -ENOENT) {
+ if (count >= nbmem) {
+ DBG2("Reallocating event 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");
+ ret = -ENOMEM;
+ goto rcu_error;
+ }
+ }
+ memcpy(tmp[count].name, iter.name, LTTNG_UST_SYM_NAME_LEN);
+ memcpy(tmp[count].loglevel, iter.loglevel, LTTNG_UST_SYM_NAME_LEN);
+ tmp[count].loglevel_value = iter.loglevel_value;
+ tmp[count].type = LTTNG_UST_TRACEPOINT;
+ tmp[count].pid = app->key.pid;
+ tmp[count].enabled = -1;
+ count++;
+ }
+ }
+
+ ret = count;
+ *events = tmp;
+
+ DBG2("UST app list events done (%zu events)", count);
+
+rcu_error:
+ rcu_read_unlock();
+error:
+ return ret;
+}
+
+/*
+ * Free and clean all traceable apps of the global list.
+ */
+void ust_app_clean_list(void)
+{
+ int ret;
+ struct cds_lfht_iter iter;
+ struct ust_app *app;
+
+ DBG2("UST app cleaning registered apps hash table");
+
+ rcu_read_lock();
+
+ cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
+ ret = hashtable_del(ust_app_ht, &iter);
+ assert(!ret);
+ call_rcu(&iter.node->head, delete_ust_app_rcu);
+ }
+
+ hashtable_destroy(ust_app_ht);
+ hashtable_destroy(ust_app_sock_key_map);
+
+ rcu_read_unlock();
+}
+
+/*
+ * Init UST app hash table.
+ */
+void ust_app_ht_alloc(void)
+{
+ ust_app_ht = hashtable_new(0);
+ ust_app_sock_key_map = hashtable_new(0);
+}
+
+/*
+ * For a specific UST session, disable the channel for all registered apps.
+ */
+int ust_app_disable_channel_glb(struct ltt_ust_session *usess,
+ struct ltt_ust_channel *uchan)
+{
+ int ret = 0;
+ struct cds_lfht_iter iter;
+ struct cds_lfht_node *ua_chan_node;
+ struct ust_app *app;
+ struct ust_app_session *ua_sess;
+ struct ust_app_channel *ua_chan;
+
+ if (usess == NULL || uchan == NULL) {
+ ERR("Disabling UST global channel with NULL values");
+ ret = -1;
+ goto error;
+ }
+
+ DBG2("UST app disabling channel %s from global domain for session uid %d",
+ uchan->name, usess->uid);
+
+ rcu_read_lock();
+
+ /* For every registered applications */
+ cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
+ ua_sess = lookup_session_by_app(usess, app);
+ if (ua_sess == NULL) {
+ continue;
+ }
+
+ /* Get channel */
+ ua_chan_node = hashtable_lookup(ua_sess->channels,
+ (void *)uchan->name, strlen(uchan->name), &iter);
+ /* If the session if found for the app, the channel must be there */
+ assert(ua_chan_node);
+
+ ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
+ /* The channel must not be already disabled */
+ assert(ua_chan->enabled == 1);
+
+ /* Disable channel onto application */
+ ret = disable_ust_app_channel(ua_sess, ua_chan, app);
+ if (ret < 0) {
+ /* XXX: We might want to report this error at some point... */
+ continue;
+ }
+ }
+
+ rcu_read_unlock();
+
+error:
+ return ret;
+}
+
+/*
+ * For a specific UST session, enable the channel for all registered apps.
+ */
+int ust_app_enable_channel_glb(struct ltt_ust_session *usess,
+ struct ltt_ust_channel *uchan)
+{
+ int ret = 0;
+ struct cds_lfht_iter iter;
+ struct ust_app *app;
+ struct ust_app_session *ua_sess;
+
+ if (usess == NULL || uchan == NULL) {
+ ERR("Adding UST global channel to NULL values");
+ ret = -1;
+ goto error;
+ }
+
+ DBG2("UST app enabling channel %s to global domain for session uid %d",
+ uchan->name, usess->uid);
+
+ rcu_read_lock();
+
+ /* For every registered applications */
+ cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
+ ua_sess = lookup_session_by_app(usess, app);
+ if (ua_sess == NULL) {
+ continue;
+ }
+
+ /* Enable channel onto application */
+ ret = enable_ust_app_channel(ua_sess, uchan, app);
+ if (ret < 0) {
+ /* XXX: We might want to report this error at some point... */
+ continue;
+ }
+ }
+
+ rcu_read_unlock();
+
+error:
+ return ret;
+}
+
+/*
+ * Disable an event in a channel and for a specific session.
+ */
+int ust_app_disable_event_glb(struct ltt_ust_session *usess,
+ struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
+{
+ int ret = 0;
+ struct cds_lfht_iter iter, uiter;
+ struct cds_lfht_node *ua_chan_node, *ua_event_node;
+ struct ust_app *app;
+ struct ust_app_session *ua_sess;
+ struct ust_app_channel *ua_chan;
+ struct ust_app_event *ua_event;
+
+ DBG("UST app disabling event %s for all apps in channel "
+ "%s for session uid %d", uevent->attr.name, uchan->name, usess->uid);
+
+ rcu_read_lock();
+
+ /* For all registered applications */
+ cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
+ ua_sess = lookup_session_by_app(usess, app);
+ if (ua_sess == NULL) {
+ /* Next app */
+ continue;
+ }
+
+ /* Lookup channel in the ust app session */
+ ua_chan_node = hashtable_lookup(ua_sess->channels,
+ (void *)uchan->name, strlen(uchan->name), &uiter);
+ if (ua_chan_node == NULL) {
+ DBG2("Channel %s not found in session uid %d for app pid %d."
+ "Skipping", uchan->name, usess->uid, app->key.pid);
+ continue;
+ }
+ ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
+
+ ua_event_node = hashtable_lookup(ua_chan->events,
+ (void *)uevent->attr.name, strlen(uevent->attr.name), &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);
+ continue;
+ }
+ ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
+
+ ret = disable_ust_app_event(ua_sess, ua_event, app);
+ if (ret < 0) {
+ /* XXX: Report error someday... */
+ continue;
+ }
+ }
+
+ rcu_read_unlock();
+
+ return ret;
+}
+
+/*
+ * For a specific UST session and UST channel, the event for all
+ * registered apps.
+ */
+int ust_app_disable_all_event_glb(struct ltt_ust_session *usess,
+ struct ltt_ust_channel *uchan)
+{
+ int ret = 0;
+ struct cds_lfht_iter iter, uiter;
+ struct cds_lfht_node *ua_chan_node;
+ struct ust_app *app;
+ struct ust_app_session *ua_sess;
+ struct ust_app_channel *ua_chan;
+ struct ust_app_event *ua_event;
+
+ DBG("UST app disabling all event for all apps in channel "
+ "%s for session uid %d", uchan->name, usess->uid);
+
+ rcu_read_lock();
+
+ /* For all registered applications */
+ cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
+ ua_sess = lookup_session_by_app(usess, app);
+ /* If ua_sess is NULL, there is a code flow error */
+ assert(ua_sess);
+
+ /* Lookup channel in the ust app session */
+ ua_chan_node = hashtable_lookup(ua_sess->channels, (void *)uchan->name,
+ strlen(uchan->name), &uiter);
+ /* If the channel is not found, there is a code flow error */
+ assert(ua_chan_node);
+
+ ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
+
+ /* Disable each events of channel */
+ cds_lfht_for_each_entry(ua_chan->events, &uiter, ua_event, node) {
+ ret = disable_ust_app_event(ua_sess, ua_event, app);
+ if (ret < 0) {
+ /* XXX: Report error someday... */
+ continue;
+ }
+ }
+ }
+
+ rcu_read_unlock();
+
+ return ret;
+}
+
+/*
+ * For a specific UST session, create the channel for all registered apps.
+ */
+int ust_app_create_channel_glb(struct ltt_ust_session *usess,
+ struct ltt_ust_channel *uchan)
+{
+ int ret = 0;
+ struct cds_lfht_iter iter;
+ struct ust_app *app;
+ struct ust_app_session *ua_sess;
+ struct ust_app_channel *ua_chan;
+
+ if (usess == NULL || uchan == NULL) {
+ ERR("Adding UST global channel to NULL values");
+ ret = -1;
+ goto error;
+ }
+
+ DBG2("UST app adding channel %s to global domain for session uid %d",
+ uchan->name, usess->uid);
+
+ rcu_read_lock();
+
+ /* For every registered applications */
+ cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
+ /*
+ * Create session on the tracer side and add it to app session HT. Note
+ * 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) {
+ continue;
+ }
+
+ /* Create channel onto application */
+ ua_chan = create_ust_app_channel(ua_sess, uchan, app);
+ if (ua_chan == NULL) {
+ continue;
+ }
+ }
+
+ rcu_read_unlock();
+
+error:
+ return ret;
+}
+
+/*
+ * Enable event for a specific session and channel on the tracer.
+ */
+int ust_app_enable_event_glb(struct ltt_ust_session *usess,
+ struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
+{
+ int ret = 0;
+ struct cds_lfht_iter iter, uiter;
+ struct cds_lfht_node *ua_chan_node, *ua_event_node;
+ struct ust_app *app;
+ struct ust_app_session *ua_sess;
+ struct ust_app_channel *ua_chan;
+ struct ust_app_event *ua_event;
+
+ DBG("UST app enabling event %s for all apps for session uid %d",
+ uevent->attr.name, usess->uid);
+
+ /*
+ * NOTE: At this point, this function is called only if the session and
+ * channel passed are already created for all apps. and enabled on the
+ * tracer also.
+ */
+
+ rcu_read_lock();
+
+ /* For all registered applications */
+ cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
+ ua_sess = lookup_session_by_app(usess, app);
+ /* If ua_sess is NULL, there is a code flow error */
+ assert(ua_sess);
+
+ /* Lookup channel in the ust app session */
+ ua_chan_node = hashtable_lookup(ua_sess->channels, (void *)uchan->name,
+ strlen(uchan->name), &uiter);
+ /* If the channel is not found, there is a code flow error */
+ assert(ua_chan_node);
+
+ ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
+
+ ua_event_node = hashtable_lookup(ua_chan->events,
+ (void*)uevent->attr.name, strlen(uevent->attr.name), &uiter);
+ if (ua_event_node == NULL) {
+ DBG3("UST app enable event %s not found for app PID %d."
+ "Skipping app", uevent->attr.name, app->key.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) {
+ goto error;
+ }
+ }
+
+error:
+ rcu_read_unlock();
+ return ret;
+}
+
+/*
+ * For a specific existing UST session and UST channel, creates the event for
+ * all registered apps.
+ */
+int ust_app_create_event_glb(struct ltt_ust_session *usess,
+ struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
+{
+ int ret = 0;
+ struct cds_lfht_iter iter, uiter;
+ struct cds_lfht_node *ua_chan_node;
+ struct ust_app *app;
+ struct ust_app_session *ua_sess;
+ struct ust_app_channel *ua_chan;
+
+ DBG("UST app creating event %s for all apps for session uid %d",
+ uevent->attr.name, usess->uid);
+
+ /*
+ * NOTE: At this point, this function is called only if the session and
+ * channel passed are already created for all apps. and enabled on the
+ * tracer also.
+ */
+
+ rcu_read_lock();
+
+ /* For all registered applications */
+ cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
+ ua_sess = lookup_session_by_app(usess, app);
+ /* If ua_sess is NULL, there is a code flow error */
+ assert(ua_sess);
+
+ /* Lookup channel in the ust app session */
+ ua_chan_node = hashtable_lookup(ua_sess->channels, (void *)uchan->name,
+ strlen(uchan->name), &uiter);
+ /* If the channel is not found, there is a code flow error */
+ assert(ua_chan_node);
+
+ ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
+
+ ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
+ if (ret < 0) {
+ continue;
+ }
+ }
+
+ rcu_read_unlock();
+
+ return ret;
+}
+
+/*
+ * Start tracing for a specific UST session and app.
+ */
+int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app)
+{
+ int ret = 0;
+ struct cds_lfht_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);
+
+ rcu_read_lock();
+
+ ua_sess = lookup_session_by_app(usess, app);
+ if (ua_sess == NULL) {
+ goto error_rcu_unlock;
+ }
+
+ /* Upon restart, we skip the setup, already done */
+ if (ua_sess->started) {
+ goto skip_setup;
+ }
+
+ 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, &iter, ua_chan, node) {
+ /* Create all streams */
+ while (1) {
+ /* Create UST stream */
+ ustream = zmalloc(sizeof(*ustream));
+ if (ustream == NULL) {
+ PERROR("zmalloc ust stream");
+ 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);
+ if (ret < 0) {
+ goto error_rcu_unlock;
+ }
+ ua_sess->started = 1;
+
+skip_setup:
+ /* This start the UST tracing */
+ ret = ustctl_start_session(app->key.sock, ua_sess->handle);
+ if (ret < 0) {
+ ERR("Error starting tracing for app pid: %d", app->key.pid);
+ goto error_rcu_unlock;
+ }
+
+ rcu_read_unlock();
+
+ /* Quiescent wait after starting trace */
+ ustctl_wait_quiescent(app->key.sock);
+
+ return 0;
+
+error_rcu_unlock:
+ rcu_read_unlock();
+ return -1;
+}
+
+/*
+ * Stop tracing for a specific UST session and app.
+ */
+int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app)
+{
+ int ret = 0;
+ struct cds_lfht_iter iter;
+ struct ust_app_session *ua_sess;
+ struct ust_app_channel *ua_chan;
+
+ DBG("Stopping tracing for ust app pid %d", app->key.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;
+ }
+
+ cds_lfht_for_each_entry(ua_sess->channels, &iter, ua_chan, node) {
+ ret = ustctl_sock_flush_buffer(app->key.sock, ua_chan->obj);
+ if (ret < 0) {
+ ERR("UST app PID %d channel %s flush failed",
+ app->key.pid, ua_chan->name);
+ ERR("Ended with ret %d", ret);
+ /* Continuing flushing all buffers */
+ continue;
+ }
+ }
+
+ /* This inhibits UST tracing */
+ ret = ustctl_stop_session(app->key.sock, ua_sess->handle);
+ if (ret < 0) {
+ ERR("Error stopping tracing for app pid: %d", app->key.pid);
+ goto error_rcu_unlock;
+ }
+
+ rcu_read_unlock();
+
+ /* Quiescent wait after stopping trace */
+ ustctl_wait_quiescent(app->key.sock);
+
+ /* Flush all buffers before stopping */
+ ret = ustctl_sock_flush_buffer(app->key.sock, ua_sess->metadata->obj);
+ if (ret < 0) {
+ ERR("UST app PID %d metadata flush failed", app->key.pid);
+ ERR("Ended with ret %d", ret);
+ }
+
+ return 0;
+
+error_rcu_unlock:
+ rcu_read_unlock();
+ return -1;
+}
+
+/*
+ * Destroy a specific UST session in apps.
+ */
+int ust_app_destroy_trace(struct ltt_ust_session *usess, struct ust_app *app)
+{
+ struct ust_app_session *ua_sess;
+ struct lttng_ust_object_data obj;
+ struct cds_lfht_iter iter;
+ struct cds_lfht_node *node;
+ int ret;
+
+ DBG("Destroy tracing for ust app pid %d", app->key.pid);
+
+ rcu_read_lock();
+
+ __lookup_session_by_app(usess, app, &iter);
+ node = hashtable_iter_get_node(&iter);
if (node == NULL) {
- goto error;
+ /* Only malloc can failed so something is really wrong */
+ goto error_rcu_unlock;
}
+ ua_sess = caa_container_of(node, struct ust_app_session, node);
+ ret = hashtable_del(app->sessions, &iter);
+ assert(!ret);
+ delete_ust_app_session(app->key.sock, ua_sess);
+ 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);
- return caa_container_of(node, struct ust_app_session, node);
+ rcu_read_unlock();
-error:
- return NULL;
+ /* Quiescent wait after stopping trace */
+ ustctl_wait_quiescent(app->key.sock);
+
+ return 0;
+
+error_rcu_unlock:
+ rcu_read_unlock();
+ return -1;
}
-int ust_app_add_channel(struct ltt_ust_session *usess,
- struct ltt_ust_channel *uchan)
+/*
+ * Start tracing for the UST session.
+ */
+int ust_app_start_trace_all(struct ltt_ust_session *usess)
{
int ret = 0;
struct cds_lfht_iter iter;
- struct cds_lfht_node *node, *ua_chan_node;
struct ust_app *app;
- struct ust_app_session *ua_sess;
- struct ust_app_channel *ua_chan;
- DBG2("UST app adding channel %s to global domain for session uid %d",
- uchan->name, usess->uid);
+ DBG("Starting all UST traces");
rcu_read_lock();
- hashtable_get_first(ust_app_ht, &iter);
- while ((node = hashtable_iter_get_node(&iter)) != NULL) {
- app = caa_container_of(node, struct ust_app, node);
- ua_sess = lookup_session_by_app(usess, app);
- if (ua_sess == NULL) {
- DBG2("UST app pid: %d session uid %d not found, creating one",
- app->key.pid, usess->uid);
- ua_sess = alloc_app_session();
- if (ua_sess == NULL) {
- /* Only malloc can failed so something is really wrong */
- goto next;
- }
- shallow_copy_session(ua_sess, usess);
+ cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
+ ret = ust_app_start_trace(usess, app);
+ if (ret < 0) {
+ /* Continue to next apps even on error */
+ continue;
}
+ }
- if (ua_sess->handle == -1) {
- ret = ustctl_create_session(app->key.sock);
- if (ret < 0) {
- DBG("Error creating session for app pid %d, sock %d",
- app->key.pid, app->key.sock);
- /* TODO: free() ua_sess */
- goto next;
- }
+ rcu_read_unlock();
- DBG2("UST app ustctl create session handle %d", ret);
- ua_sess->handle = ret;
+ return 0;
+}
- /* Add ust app session to app's HT */
- hashtable_node_init(&ua_sess->node,
- (void *)((unsigned long) ua_sess->uid), sizeof(void *));
- hashtable_add_unique(app->sessions, &ua_sess->node);
- }
+/*
+ * Start tracing for the UST session.
+ */
+int ust_app_stop_trace_all(struct ltt_ust_session *usess)
+{
+ int ret = 0;
+ struct cds_lfht_iter iter;
+ struct ust_app *app;
- /* Lookup channel in the ust app session */
- ua_chan_node = hashtable_lookup(ua_sess->channels,
- (void *) uchan->name, strlen(uchan->name), &iter);
- if (ua_chan_node == NULL) {
- ERR("Channel suppose to be present with the above shallow "
- "session copy. Continuing...");
- goto next;
- }
+ DBG("Stopping all UST traces");
- ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
+ rcu_read_lock();
- /* TODO: remove cast and use lttng-ust-abi.h */
- ret = ustctl_create_channel(app->key.sock, ua_sess->handle,
- (struct lttng_ust_channel_attr *)&uchan->attr, &ua_chan->obj);
+ cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
+ ret = ust_app_stop_trace(usess, app);
if (ret < 0) {
- DBG("Error creating channel %s for app (pid: %d, sock: %d) "
- "and session handle %d with ret %d",
- uchan->name, app->key.pid, app->key.sock,
- ua_sess->handle, ret);
- goto next;
+ /* Continue to next apps even on error */
+ continue;
}
+ }
+
+ rcu_read_unlock();
+
+ return 0;
+}
+
+/*
+ * Destroy app UST session.
+ */
+int ust_app_destroy_trace_all(struct ltt_ust_session *usess)
+{
+ int ret = 0;
+ struct cds_lfht_iter iter;
+ struct ust_app *app;
- ua_chan->handle = ua_chan->obj->handle;
- ua_chan->attr.shm_fd = ua_chan->obj->shm_fd;
- ua_chan->attr.wait_fd = ua_chan->obj->wait_fd;
- ua_chan->attr.memory_map_size = ua_chan->obj->memory_map_size;
+ DBG("Destroy all UST traces");
- DBG2("Channel %s UST create successfully for pid:%d and sock:%d",
- uchan->name, app->key.pid, app->key.sock);
+ rcu_read_lock();
-next:
- /* Next applications */
- hashtable_get_next(ust_app_ht, &iter);
+ cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
+ ret = ust_app_destroy_trace(usess, app);
+ if (ret < 0) {
+ /* Continue to next apps even on error */
+ continue;
+ }
}
+
rcu_read_unlock();
- return ret;
+ return 0;
}
-int ust_app_add_event(struct ltt_ust_session *usess,
- struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
+/*
+ * Add channels/events from UST global domain to registered apps at sock.
+ */
+void ust_app_global_update(struct ltt_ust_session *usess, int sock)
{
int ret = 0;
struct cds_lfht_iter iter;
- struct cds_lfht_node *node, *ua_chan_node, *ua_event_node;
struct ust_app *app;
struct ust_app_session *ua_sess;
struct ust_app_channel *ua_chan;
struct ust_app_event *ua_event;
- struct lttng_ust_event ltt_uevent;
- struct lttng_ust_object_data *obj_event;
- DBG2("UST app adding event %s to global domain for session uid %d",
- uevent->attr.name, usess->uid);
+ if (usess == NULL) {
+ ERR("No UST session on global update. Returning");
+ goto error;
+ }
- rcu_read_lock();
- hashtable_get_first(ust_app_ht, &iter);
- while ((node = hashtable_iter_get_node(&iter)) != NULL) {
- app = caa_container_of(node, struct ust_app, node);
+ DBG2("UST app global update for app sock %d for session uid %d", sock,
+ usess->uid);
- ua_sess = lookup_session_by_app(usess, app);
- if (ua_sess == NULL) {
- DBG2("UST app (pid: %d, sock: %d) session not found, creating one",
- app->key.pid, app->key.sock);
- ua_sess = alloc_app_session();
- if (ua_sess == NULL) {
- /* Only malloc can failed so something is really wrong */
- goto next;
- }
- shallow_copy_session(ua_sess, usess);
- }
+ rcu_read_lock();
- if (ua_sess->handle == -1) {
- ret = ustctl_create_session(app->key.sock);
- if (ret < 0) {
- DBG("Error creating session for app pid %d, sock %d",
- app->key.pid, app->key.sock);
- /* TODO: free() ua_sess */
- goto next;
- }
+ app = find_app_by_sock(sock);
+ if (app == NULL) {
+ ERR("Failed to update app sock %d", sock);
+ goto error;
+ }
- DBG2("UST app ustctl create session handle %d", ret);
- ua_sess->handle = ret;
- /* Add ust app session to app's HT */
- hashtable_node_init(&ua_sess->node,
- (void *)((unsigned long) ua_sess->uid), sizeof(void *));
- hashtable_add_unique(app->sessions, &ua_sess->node);
- }
+ ua_sess = create_ust_app_session(usess, app);
+ if (ua_sess == NULL) {
+ goto error;
+ }
- /* Lookup channel in the ust app session */
- ua_chan_node = hashtable_lookup(ua_sess->channels,
- (void *) uchan->name, strlen(uchan->name), &iter);
- if (ua_chan_node == NULL) {
- ERR("Channel suppose to be present with the above shallow "
- "session copy. Continuing...");
- goto next;
+ /*
+ * We can iterate safely here over all UST app session sicne the create ust
+ * app session above made a shadow copy of the UST global domain from the
+ * ltt ust session.
+ */
+ cds_lfht_for_each_entry(ua_sess->channels, &iter, ua_chan, node) {
+ ret = create_ust_channel(app, ua_sess, ua_chan);
+ if (ret < 0) {
+ /* FIXME: Should we quit here or continue... */
+ continue;
}
- ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
-
- /* Prepare lttng ust event */
- strncpy(ltt_uevent.name, uevent->attr.name, sizeof(ltt_uevent.name));
- ltt_uevent.name[sizeof(ltt_uevent.name) - 1] = '\0';
- /* TODO: adjust to other instrumentation types */
- ltt_uevent.instrumentation = LTTNG_UST_TRACEPOINT;
-
- /* Get event node */
- ua_event_node = hashtable_lookup(ua_chan->events,
- (void *) uevent->attr.name, strlen(uevent->attr.name), &iter);
- if (ua_event_node == NULL) {
- DBG2("UST app event %s not found, creating one", uevent->attr.name);
- /* Does not exist so create one */
- ua_event = alloc_app_event(uevent->attr.name);
- if (ua_event == NULL) {
- /* Only malloc can failed so something is really wrong */
- goto next;
- }
-
- shallow_copy_event(ua_event, uevent);
-
- /* Create UST event on tracer */
- ret = ustctl_create_event(app->key.sock, <t_uevent, ua_chan->obj,
- &obj_event);
+ /* For each events */
+ cds_lfht_for_each_entry(ua_chan->events, &iter, ua_event, node) {
+ ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
if (ret < 0) {
- ERR("Error ustctl create event %s for app pid: %d with ret %d",
- uevent->attr.name, app->key.pid, ret);
- /* TODO: free() ua_event and obj_event */
- goto next;
- }
- ua_event->obj = obj_event;
- ua_event->handle = obj_event->handle;
- ua_event->enabled = 1;
- } else {
- ua_event = caa_container_of(ua_event_node,
- struct ust_app_event, node);
-
- if (ua_event->enabled == 0) {
- ret = ustctl_enable(app->key.sock, ua_event->obj);
- if (ret < 0) {
- ERR("Error ustctl enable event %s for app "
- "pid: %d with ret %d", uevent->attr.name,
- app->key.pid, ret);
- goto next;
- }
- ua_event->enabled = 1;
+ /* FIXME: Should we quit here or continue... */
+ continue;
}
}
+ }
- hashtable_add_unique(ua_chan->events, &ua_event->node);
-
- DBG2("Event %s UST create successfully for pid:%d", uevent->attr.name,
- app->key.pid);
+ if (usess->start_trace) {
+ ret = ust_app_start_trace(usess, app);
+ if (ret < 0) {
+ goto error;
+ }
-next:
- /* Next applications */
- hashtable_get_next(ust_app_ht, &iter);
+ DBG2("UST trace started for app pid %d", app->key.pid);
}
- rcu_read_unlock();
- return ret;
+error:
+ rcu_read_unlock();
+ return;
}
-int ust_app_start_trace(struct ltt_ust_session *usess)
+/*
+ * Add context to a specific channel for global UST domain.
+ */
+int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess,
+ struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx)
{
int ret = 0;
- struct cds_lfht_iter iter;
- struct cds_lfht_node *node, *ua_chan_node;
- struct ust_app *app;
+ struct cds_lfht_node *ua_chan_node;
+ struct cds_lfht_iter iter, uiter;
+ struct ust_app_channel *ua_chan = NULL;
struct ust_app_session *ua_sess;
- struct ust_app_channel *ua_chan;
- struct lttng_ust_channel_attr uattr;
- struct ltt_ust_channel *uchan;
+ struct ust_app *app;
rcu_read_lock();
- hashtable_get_first(ust_app_ht, &iter);
- while ((node = hashtable_iter_get_node(&iter)) != NULL) {
- app = caa_container_of(node, struct ust_app, node);
+ cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
ua_sess = lookup_session_by_app(usess, app);
if (ua_sess == NULL) {
- /* Only malloc can failed so something is really wrong */
- goto next;
+ continue;
}
- if (ua_sess->metadata == NULL) {
- /* Allocate UST metadata */
- ua_sess->metadata = trace_ust_create_metadata(usess->pathname);
- if (ua_sess->metadata == NULL) {
- ERR("UST app session %d creating metadata failed",
- ua_sess->handle);
- goto next;
- }
-
- 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",
- app->key.pid);
- goto next;
- }
-
- DBG2("UST metadata opened for app pid %d", app->key.pid);
+ /* Lookup channel in the ust app session */
+ ua_chan_node = hashtable_lookup(ua_sess->channels,
+ (void *)uchan->name, strlen(uchan->name), &uiter);
+ if (ua_chan_node == NULL) {
+ continue;
}
+ ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
+ node);
- /* Open UST metadata stream */
- if (ua_sess->metadata->stream_obj == NULL) {
- ret = ustctl_create_stream(app->key.sock, ua_sess->metadata->obj,
- &ua_sess->metadata->stream_obj);
- if (ret < 0) {
- ERR("UST create metadata stream failed");
- goto next;
- }
-
- ret = snprintf(ua_sess->metadata->pathname, PATH_MAX, "%s/%s",
- usess->pathname, "metadata");
- if (ret < 0) {
- PERROR("asprintf UST create stream");
- goto next;
- }
-
- DBG2("UST metadata stream object created for app pid %d",
- app->key.pid);
+ ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app);
+ if (ret < 0) {
+ continue;
}
+ }
- /* For each channel */
- hashtable_get_first(usess->domain_global.channels, &iter);
- while ((node = hashtable_iter_get_node(&iter)) != NULL) {
- uchan = caa_container_of(node, struct ltt_ust_channel, node);
-
- /* Lookup channel in the ust app session */
- ua_chan_node = hashtable_lookup(ua_sess->channels,
- (void *) uchan->name, strlen(uchan->name), &iter);
- if (ua_chan_node == NULL) {
- ERR("Channel suppose to be present with the above shallow "
- "session copy. Continuing...");
- goto next;
- }
-
- ua_chan = caa_container_of(ua_chan_node,
- struct ust_app_channel, node);
+ rcu_read_unlock();
+ return ret;
+}
- for (;;) {
- struct lttng_ust_object_data *obj;
- struct ltt_ust_stream *ustream;
+/*
+ * 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 cds_lfht_node *ua_chan_node, *ua_event_node;
+ struct cds_lfht_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;
- ret = ustctl_create_stream(app->key.sock, ua_chan->obj,
- &obj);
- if (ret < 0) {
- /* Got all streams */
- goto next_chan;
- }
+ rcu_read_lock();
- ustream = malloc(sizeof(*ustream));
- if (ustream == NULL) {
- goto next_chan;
- }
- memset(ustream, 0, sizeof(struct ltt_ust_stream));
- ustream->obj = obj;
- 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",
- uchan->pathname, uchan->name,
- ua_chan->streams.count++);
- if (ret < 0) {
- PERROR("asprintf UST create stream");
- goto next_chan;
- }
- }
+ cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
+ ua_sess = lookup_session_by_app(usess, app);
+ if (ua_sess == NULL) {
+ continue;
+ }
-next_chan:
- /* Next applications */
- hashtable_get_next(ua_sess->channels, &iter);
+ /* Lookup channel in the ust app session */
+ ua_chan_node = hashtable_lookup(ua_sess->channels,
+ (void *)uchan->name, strlen(uchan->name), &uiter);
+ if (ua_chan_node == NULL) {
+ continue;
}
+ ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
+ node);
- /* Setup UST consumer socket and send fds to it */
- ret = ust_consumer_send_session(usess->consumer_fd, ua_sess);
- if (ret < 0) {
- goto next;
+ ua_event_node = hashtable_lookup(ua_chan->events,
+ (void *)uevent->attr.name, strlen(uevent->attr.name), &uiter);
+ if (ua_event_node == NULL) {
+ continue;
}
+ ua_event = caa_container_of(ua_event_node, struct ust_app_event,
+ node);
- /* This start the UST tracing */
- ret = ustctl_start_session(app->key.sock, ua_sess->handle);
+ ret = create_ust_app_event_context(ua_sess, ua_event, &uctx->ctx, app);
if (ret < 0) {
- ERR("Error starting tracing for app pid: %d", app->key.pid);
- goto next;
+ continue;
}
-
- /* Quiescent wait after starting trace */
- ustctl_wait_quiescent(app->key.sock);
-next:
- /* Next applications */
- hashtable_get_next(ust_app_ht, &iter);
}
- rcu_read_unlock();
- return 0;
+ rcu_read_unlock();
+ return ret;
}
-void ust_app_global_update(struct ltt_ust_session *usess, int sock)
+/*
+ * Enable event for a channel from a UST session for a specific PID.
+ */
+int ust_app_enable_event_pid(struct ltt_ust_session *usess,
+ struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid)
{
int ret = 0;
- int session_existed = 1;
struct cds_lfht_iter iter;
- struct cds_lfht_node *node, *ua_chan_node;
+ struct cds_lfht_node *ua_chan_node, *ua_event_node;
struct ust_app *app;
struct ust_app_session *ua_sess;
struct ust_app_channel *ua_chan;
struct ust_app_event *ua_event;
- struct lttng_ust_event ltt_uevent;
- struct ltt_ust_channel *uchan;
- struct lttng_ust_object_data *obj_event;
- DBG2("UST app global update for app sock %d for session uid %d", sock,
- usess->uid);
+ DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid);
rcu_read_lock();
- app = find_app_by_sock(sock);
+
+ app = ust_app_find_by_pid(pid);
if (app == NULL) {
- ERR("Failed to update app sock %d", sock);
+ ERR("UST app enable event per PID %d not found", pid);
+ ret = -1;
goto error;
}
ua_sess = lookup_session_by_app(usess, app);
- if (ua_sess == NULL) {
- DBG2("UST app pid: %d session uid %d not found, creating one",
- app->key.pid, usess->uid);
- ua_sess = alloc_app_session();
- if (ua_sess == NULL) {
- /* Only malloc can failed so something is really wrong */
- goto error;
- }
- shallow_copy_session(ua_sess, usess);
- session_existed= 0;
- }
-
- if (ua_sess->handle == -1) {
- ret = ustctl_create_session(app->key.sock);
- if (ret < 0) {
- DBG("Error creating session for app pid %d, sock %d",
- app->key.pid, app->key.sock);
- /* TODO: free() ua_sess */
- goto error;
- }
-
- DBG2("UST app ustctl create session handle %d", ret);
- ua_sess->handle = ret;
+ /* If ua_sess is NULL, there is a code flow error */
+ assert(ua_sess);
- /* Add ust app session to app's HT */
- hashtable_node_init(&ua_sess->node,
- (void *)((unsigned long) ua_sess->uid), sizeof(void *));
- hashtable_add_unique(app->sessions, &ua_sess->node);
- }
-
- if (session_existed) {
- goto error;
- }
+ /* Lookup channel in the ust app session */
+ ua_chan_node = hashtable_lookup(ua_sess->channels, (void *)uchan->name,
+ strlen(uchan->name), &iter);
+ /* If the channel is not found, there is a code flow error */
+ assert(ua_chan_node);
- /* Iterate over all channels */
- hashtable_get_first(usess->domain_global.channels, &iter);
- while ((node = hashtable_iter_get_node(&iter)) != NULL) {
- uchan = caa_container_of(node, struct ltt_ust_channel, node);
+ ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
- /* Lookup channel in the ust app session */
- ua_chan_node = hashtable_lookup(ua_sess->channels,
- (void *) uchan->name, strlen(uchan->name), &iter);
- if (ua_chan_node == NULL) {
- ERR("UST app channel not found for uchan %s", uchan->name);
- goto next_chan;
+ ua_event_node = hashtable_lookup(ua_chan->events,
+ (void*)uevent->attr.name, strlen(uevent->attr.name), &iter);
+ if (ua_event_node == 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);
- ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
-
- /* TODO: remove cast and use lttng-ust-abi.h */
- ret = ustctl_create_channel(app->key.sock, ua_sess->handle,
- (struct lttng_ust_channel_attr *)&uchan->attr, &ua_chan->obj);
+ ret = enable_ust_app_event(ua_sess, ua_event, app);
if (ret < 0) {
- DBG("Error creating channel %s for app (pid: %d, sock: %d) "
- "and session handle %d with ret %d",
- uchan->name, app->key.pid, app->key.sock,
- ua_sess->handle, ret);
- goto next_chan;
+ goto error;
}
+ }
- ua_chan->handle = ua_chan->obj->handle;
- ua_chan->attr.shm_fd = ua_chan->obj->shm_fd;
- ua_chan->attr.wait_fd = ua_chan->obj->wait_fd;
- ua_chan->attr.memory_map_size = ua_chan->obj->memory_map_size;
-
- DBG2("Channel %s UST create successfully for pid:%d and sock:%d",
- uchan->name, app->key.pid, app->key.sock);
-
- /* For each event(s) of that channel */
- hashtable_get_first(ua_chan->events, &iter);
- while ((node = hashtable_iter_get_node(&iter)) != NULL) {
- ua_event = caa_container_of(node, struct ust_app_event, node);
+error:
+ rcu_read_unlock();
+ return ret;
+}
- /* Prepare lttng ust event */
- memset(<t_uevent, 0, sizeof(ltt_uevent));
- strncpy(ltt_uevent.name, ua_event->name, sizeof(ltt_uevent.name));
- ltt_uevent.name[sizeof(ltt_uevent.name) - 1] = '\0';
+/*
+ * Disable event for a channel from a UST session for a specific PID.
+ */
+int ust_app_disable_event_pid(struct ltt_ust_session *usess,
+ struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid)
+{
+ int ret = 0;
+ struct cds_lfht_iter iter;
+ struct cds_lfht_node *ua_chan_node, *ua_event_node;
+ struct ust_app *app;
+ struct ust_app_session *ua_sess;
+ struct ust_app_channel *ua_chan;
+ struct ust_app_event *ua_event;
- /* TODO: adjust to other instrumentation types */
- ltt_uevent.instrumentation = LTTNG_UST_TRACEPOINT;
+ DBG("UST app disabling event %s for PID %d", uevent->attr.name, pid);
- /* Create UST event on tracer */
- ret = ustctl_create_event(app->key.sock, <t_uevent, ua_chan->obj,
- &obj_event);
- if (ret < 0) {
- ERR("Error ustctl create event %s for app pid: %d with ret %d",
- ua_event->name, app->key.pid, ret);
- /* TODO: free() ua_event and obj_event */
- goto next_event;
- }
+ rcu_read_lock();
- ua_event->obj = obj_event;
- ua_event->handle = obj_event->handle;
- ua_event->enabled = 1;
+ app = ust_app_find_by_pid(pid);
+ if (app == NULL) {
+ ERR("UST app disable event per PID %d not found", pid);
+ ret = -1;
+ goto error;
+ }
- DBG2("Event %s UST create successfully for pid:%d",
- ua_event->name, app->key.pid);
+ ua_sess = lookup_session_by_app(usess, app);
+ /* If ua_sess is NULL, there is a code flow error */
+ assert(ua_sess);
+
+ /* Lookup channel in the ust app session */
+ ua_chan_node = hashtable_lookup(ua_sess->channels, (void *)uchan->name,
+ strlen(uchan->name), &iter);
+ if (ua_chan_node == NULL) {
+ /* Channel does not exist, skip disabling */
+ goto error;
+ }
+ ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
-next_event:
- hashtable_get_next(ua_chan->events, &iter);
- }
+ ua_event_node = hashtable_lookup(ua_chan->events,
+ (void*)uevent->attr.name, strlen(uevent->attr.name), &iter);
+ if (ua_event_node == NULL) {
+ /* Event does not exist, skip disabling */
+ goto error;
+ }
+ ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
-next_chan:
- /* Next applications */
- hashtable_get_next(ua_sess->channels, &iter);
+ ret = disable_ust_app_event(ua_sess, ua_event, app);
+ if (ret < 0) {
+ goto error;
}
error:
rcu_read_unlock();
- return;
+ return ret;
}
projects / lttng-tools.git / blobdiff