X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=lttng-sessiond%2Fust-app.c;h=3de826bc2d97d8ca8850735af366291a4afb6c86;hp=e063fb292ad80511f45331896704bba555898d14;hb=008dd0fe872d71d154867d25579b58a0a204d93d;hpb=dbdbd482ead909120dc3c4e4b6e41413b7fa57a1 diff --git a/lttng-sessiond/ust-app.c b/lttng-sessiond/ust-app.c index e063fb292..3de826bc2 100644 --- a/lttng-sessiond/ust-app.c +++ b/lttng-sessiond/ust-app.c @@ -25,343 +25,211 @@ #include #include #include +#include + +#include #include +#include #include +#include -#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(); - - /* TODO: clean session hashtable */ - 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. RCU read side lock must be - * held before calling this helper function. + * 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; - struct cds_lfht_iter iter; - - 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; + int ret; + struct lttng_ht_iter iter; + struct ust_app_ctx *ua_ctx; + + 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); - 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); } - - return caa_container_of(node, struct ust_app, node); - -error: - return NULL; -} - -/* - * Return pointer to traceable apps list. - */ -struct cds_lfht *ust_app_get_ht(void) -{ - return ust_app_ht; + free(ua_event); } /* - * Return ust app pointer or NULL if not found. + * Delete ust app stream 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_stream(int sock, struct ltt_ust_stream *stream) { - 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) { - rcu_read_unlock(); - DBG2("UST app no found with pid %d", pid); - goto error; + if (stream->obj) { + ustctl_release_object(sock, stream->obj); + free(stream->obj); } - rcu_read_unlock(); - - DBG2("Found UST app by pid %d", pid); - - return caa_container_of(node, struct ust_app, node); - -error: - return NULL; + free(stream); } /* - * 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 channel 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_channel(int sock, struct ust_app_channel *ua_chan) { - struct ust_app *lta; + int ret; + struct lttng_ht_iter iter; + struct ust_app_event *ua_event; + struct ust_app_ctx *ua_ctx; + struct ltt_ust_stream *stream, *stmp; - lta = malloc(sizeof(struct ust_app)); - if (lta == NULL) { - PERROR("malloc"); - return -ENOMEM; + /* 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); } - 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); + /* Wipe context */ + cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) { + ret = lttng_ht_del(ua_chan->ctx, &iter); + assert(!ret); + delete_ust_app_ctx(sock, ua_ctx); + } + lttng_ht_destroy(ua_chan->ctx); + + /* Wipe events */ + cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event, + node.node) { + ret = lttng_ht_del(ua_chan->events, &iter); + assert(!ret); + delete_ust_app_event(sock, ua_event); + } + lttng_ht_destroy(ua_chan->events); - return 0; + if (ua_chan->obj != NULL) { + ustctl_release_object(sock, ua_chan->obj); + free(ua_chan->obj); + } + free(ua_chan); } /* - * 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. + * Delete ust app session safely. RCU read lock must be held before calling + * this function. */ -void ust_app_unregister(int sock) +static +void delete_ust_app_session(int sock, struct ust_app_session *ua_sess) { - struct ust_app *lta; - struct cds_lfht_node *node; - struct cds_lfht_iter iter; + int ret; + struct lttng_ht_iter iter; + struct ust_app_channel *ua_chan; - rcu_read_lock(); - lta = find_app_by_sock(sock); - if (lta == NULL) { - ERR("Unregister app sock %d not found!", sock); - goto error; + 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); + } } - 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; + cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, + node.node) { + ret = lttng_ht_del(ua_sess->channels, &iter); + assert(!ret); + delete_ust_app_channel(sock, ua_chan); } + lttng_ht_destroy(ua_sess->channels); - 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; + if (ua_sess->handle != -1) { + ustctl_release_handle(sock, ua_sess->handle); + } + free(ua_sess); } /* - * Fill events array with all events name of all registered apps. + * Delete a traceable application structure from the global list. Never call + * this function outside of a call_rcu call. */ -int ust_app_list_events(struct lttng_event **events) +static +void delete_ust_app(struct ust_app *app) { - 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; - } + int ret, sock; + struct lttng_ht_iter iter; + struct ust_app_session *ua_sess; rcu_read_lock(); - cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) { - 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, - tmp[count].name)) != -ENOENT) { - if (count > nbmem) { - DBG2("Reallocating event list from %zu to %zu bytes", nbmem, - nbmem + UST_APP_EVENT_LIST_SIZE); - nbmem += UST_APP_EVENT_LIST_SIZE; - tmp = realloc(tmp, nbmem); - if (tmp == NULL) { - PERROR("realloc ust app events"); - ret = -ENOMEM; - goto rcu_error; - } - } + /* Delete ust app sessions info */ + sock = app->key.sock; + app->key.sock = -1; - tmp[count].type = LTTNG_UST_TRACEPOINT; - tmp[count].pid = app->key.pid; - count++; - } + /* 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); } + lttng_ht_destroy(app->sessions); - ret = count; - *events = tmp; + /* + * 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 list events done (%zu events)", count); + DBG2("UST app pid %d deleted", app->key.pid); + free(app); -rcu_error: rcu_read_unlock(); -error: - return ret; } /* - * Free and clean all traceable apps of the global list. + * URCU intermediate call to delete an UST app. */ -void ust_app_clean_list(void) +static +void delete_ust_app_rcu(struct rcu_head *head) { - int ret; - struct cds_lfht_node *node; - struct cds_lfht_iter iter; - - DBG2("UST app clean hash table"); - - rcu_read_lock(); - - 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); - } - - 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); -/* - * 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); + DBG3("Call RCU deleting app PID %d", app->key.pid); + delete_ust_app(app); } /* * Alloc new UST app session. */ -static struct ust_app_session *alloc_ust_app_session(void) +static +struct ust_app_session *alloc_ust_app_session(void) { struct ust_app_session *ua_sess; @@ -373,7 +241,7 @@ static struct ust_app_session *alloc_ust_app_session(void) } ua_sess->handle = -1; - ua_sess->channels = hashtable_new_str(0); + ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); return ua_sess; @@ -384,7 +252,9 @@ error: /* * Alloc new UST app channel. */ -static struct ust_app_channel *alloc_ust_app_channel(char *name) +static +struct ust_app_channel *alloc_ust_app_channel(char *name, + struct lttng_ust_channel *attr) { struct ust_app_channel *ua_chan; @@ -395,14 +265,22 @@ static struct ust_app_channel *alloc_ust_app_channel(char *name) 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 = 1; ua_chan->handle = -1; - ua_chan->ctx = hashtable_new(0); + 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); + 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)); + + /* Copy attributes */ + if (attr) { + memcpy(&ua_chan->attr, attr, sizeof(ua_chan->attr)); + } DBG3("UST app channel %s allocated", ua_chan->name); @@ -415,7 +293,9 @@ error: /* * Alloc new UST app event. */ -static struct ust_app_event *alloc_ust_app_event(char *name) +static +struct ust_app_event *alloc_ust_app_event(char *name, + struct lttng_ust_event *attr) { struct ust_app_event *ua_event; @@ -426,11 +306,16 @@ static struct ust_app_event *alloc_ust_app_event(char *name) 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)); + ua_event->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); + lttng_ht_node_init_str(&ua_event->node, 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); @@ -440,109 +325,487 @@ error: return NULL; } -static void shadow_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 shadow_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("Shadow 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; +} - /* Copy all events from ltt ust channel to ust app channel */ - 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 lttng_ht_node_ulong *node; + struct ust_app_key *key; + struct lttng_ht_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 shadow copy channel", - uevent->attr.name); - ua_event = alloc_ust_app_event(uevent->attr.name); - if (ua_event == NULL) { - goto next; - } - shadow_copy_event(ua_event, uevent); - hashtable_add_unique(ua_chan->events, &ua_event->node); - } + 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); -next: - /* Get next UST events */ - hashtable_get_next(uchan->events, &iter); + lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) key->pid), &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); - DBG3("Shadow copy channel done"); +error: + return NULL; +} + +/* + * 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) +{ + int ret; + + ret = ustctl_add_context(app->key.sock, &ua_ctx->ctx, + ua_chan->obj, &ua_ctx->obj); + if (ret < 0) { + goto error; + } + + ua_ctx->handle = ua_ctx->obj->handle; + + DBG2("UST app context added to channel %s successfully", ua_chan->name); + +error: + return ret; +} + +/* + * 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) { + 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; + + 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 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) { + continue; + } + 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 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 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; + 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->ht, &iter.iter, uctx, node.node) { + ua_ctx = alloc_ust_app_ctx(&uctx->ctx); + if (ua_ctx == NULL) { + continue; + } + lttng_ht_node_init_ulong(&ua_ctx->node, + (unsigned long) ua_ctx->ctx.ctx); + lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node); + } + + /* 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) { + 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; + } + shadow_copy_event(ua_event, uevent); + lttng_ht_add_unique_str(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 ltt_ust_session *usess, struct ust_app *app) { - struct cds_lfht_node *node, *ua_chan_node; - struct cds_lfht_iter iter; + struct lttng_ht_node_str *ua_chan_node; + struct lttng_ht_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->id = usess->id; 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); + 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. */ - 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); + cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter, + uchan, node.node) { + struct lttng_ht_iter uiter; - 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 shadow session copy, creating it", - uchan->name); - ua_chan = alloc_ust_app_channel(uchan->name); - if (ua_chan == NULL) { - /* malloc failed... continuing */ - goto next; - } + 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; + } - shadow_copy_channel(ua_chan, uchan); - hashtable_add_unique(ua_sess->channels, &ua_chan->node); + 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: - /* Next item in hash table */ - hashtable_get_next(usess->domain_global.channels, &iter); + shadow_copy_channel(ua_chan, uchan); + lttng_ht_add_unique_str(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 lttng_ht_iter *iter) +{ + /* Get right UST app session from app */ + lttng_ht_lookup(app->sessions, (void *)((unsigned long) usess->id), iter); +} + /* * Return ust app session from the app session hashtable using the UST session - * uid. + * id. */ 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; + struct lttng_ht_iter iter; + struct lttng_ht_node_ulong *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 = lttng_ht_iter_get_node_ulong(&iter); if (node == NULL) { goto error; } @@ -567,14 +830,14 @@ static struct ust_app_session *create_ust_app_session( 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); + DBG2("UST app pid: %d session id %d not found, creating it", + app->key.pid, usess->id); 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); + shadow_copy_session(ua_sess, usess, app); } if (ua_sess->handle == -1) { @@ -590,9 +853,8 @@ static struct ust_app_session *create_ust_app_session( 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); + lttng_ht_node_init_ulong(&ua_sess->node, (unsigned long) ua_sess->id); + lttng_ht_add_unique_ulong(app->sessions, &ua_sess->node); DBG2("UST app session created successfully with handle %d", ret); } @@ -603,49 +865,210 @@ error: return NULL; } -static struct ust_app_channel *create_ust_app_channel( - struct ust_app_session *ua_sess, struct ltt_ust_channel *uchan, +/* + * 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 *ua_chan_node; - struct ust_app_channel *ua_chan; + struct lttng_ht_iter iter; + struct lttng_ht_node_ulong *node; + struct ust_app_ctx *ua_ctx; - /* 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); - 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); - } + DBG2("UST app adding context to channel %s", ua_chan->name); - /* 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); + lttng_ht_lookup(ua_chan->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_chan->ctx, &ua_ctx->node); + + ret = create_ust_channel_context(ua_chan, ua_ctx, app); 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; +error: + return ret; +} - DBG2("Channel %s UST create successfully for pid:%d and sock:%d", - ua_chan->name, app->key.pid, app->key.sock); +/* + * 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. + */ +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 lttng_ht_iter iter; + struct lttng_ht_node_str *ua_chan_node; + struct ust_app_channel *ua_chan; + + lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); + ua_chan_node = lttng_ht_iter_get_node_str(&iter); + if (ua_chan_node == NULL) { + DBG2("Unable to find channel %s in ust session id %u", + uchan->name, ua_sess->id); + 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 lttng_ht_iter iter; + struct lttng_ht_node_str *ua_chan_node; + struct ust_app_channel *ua_chan; + + /* Lookup channel in the ust app session */ + lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); + ua_chan_node = lttng_ht_iter_get_node_str(&iter); + if (ua_chan_node == NULL) { + DBG2("Unable to find channel %s in ust session id %u", + uchan->name, ua_sess->id); + ua_chan = alloc_ust_app_channel(uchan->name, &uchan->attr); + if (ua_chan == NULL) { + goto error; + } + shadow_copy_channel(ua_chan, uchan); + } 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; + } + + lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); return ua_chan; @@ -653,413 +1076,1286 @@ error: return NULL; } -static struct ust_app_event *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) +/* + * 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; - struct cds_lfht_iter iter; - struct cds_lfht_node *ua_event_node; + 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 */ - 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 it", uevent->attr.name); - /* Does not exist so create one */ - ua_event = alloc_ust_app_event(uevent->attr.name); - if (ua_event == NULL) { - /* Only malloc can failed so something is really wrong */ - goto error; - } - shadow_copy_event(ua_event, uevent); + 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) { + ERR("UST app event %s already exist. Stopping creation.", + uevent->attr.name); + goto end; + } - hashtable_add_unique(ua_chan->events, &ua_event->node); - } else { - ua_event = caa_container_of(ua_event_node, struct ust_app_event, node); + /* 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 UST event on tracer */ - ret = ustctl_create_event(app->key.sock, &uevent->attr, ua_chan->obj, - &ua_event->obj); + /* Create it on the tracer side */ + 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 */ + rcu_read_lock(); + delete_ust_app_event(app->key.sock, ua_event); + rcu_read_unlock(); goto error; } - ua_event->handle = ua_event->obj->handle; - ua_event->enabled = 1; + ua_event->enabled = 1; - DBG2("Event %s UST create successfully for pid:%d", uevent->attr.name, - app->key.pid); + lttng_ht_add_unique_str(ua_chan->events, &ua_event->node); - return ua_event; + DBG2("UST app create event %s for PID %d completed", + ua_event->name, app->key.pid); +end: error: - return NULL; + 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; - struct lttng_ust_channel_attr uattr; - 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; - } + 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; + } + + ret = mkdir_run_as(ua_sess->path, S_IRWXU | S_IRWXG, + ua_sess->uid, ua_sess->gid); + if (ret < 0) { + PERROR("mkdir UST metadata"); + goto error; + } + + 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 lttng_ht *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 lttng_ht_node_ulong *node; + struct lttng_ht_iter iter; + + rcu_read_lock(); + lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter); + node = lttng_ht_iter_get_node_ulong(&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 = 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); + + 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); + 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 lttng_ht_node_ulong *node; + struct lttng_ht_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); + + /* 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); + + /* 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; + } + + /* 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; +} + +/* + * 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; + + 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->ht, &iter.iter, app, node.node) { + struct lttng_ust_tracepoint_iter uiter; + + 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, + &uiter)) != -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, uiter.name, LTTNG_UST_SYM_NAME_LEN); + memcpy(tmp[count].loglevel, uiter.loglevel, LTTNG_UST_SYM_NAME_LEN); + tmp[count].loglevel_value = uiter.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 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) { + ret = lttng_ht_del(ust_app_ht, &iter); + assert(!ret); + call_rcu(&node->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); + assert(!ret); + } + /* Destroy is done only when the ht is empty */ + lttng_ht_destroy(ust_app_sock_key_map); + + rcu_read_unlock(); +} + +/* + * Init UST app hash table. + */ +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); +} + +/* + * 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 lttng_ht_iter iter; + struct lttng_ht_node_str *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 id %d", + uchan->name, usess->id); + + rcu_read_lock(); + + /* For every registered applications */ + cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) { + struct lttng_ht_iter uiter; + ua_sess = lookup_session_by_app(usess, app); + if (ua_sess == NULL) { + continue; + } + + /* Get channel */ + lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); + ua_chan_node = lttng_ht_iter_get_node_str(&uiter); + /* 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 lttng_ht_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 id %d", + uchan->name, usess->id); + + rcu_read_lock(); + + /* For every registered applications */ + cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.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 lttng_ht_iter iter, uiter; + struct lttng_ht_node_str *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 id %d", uevent->attr.name, uchan->name, usess->id); + + rcu_read_lock(); + + /* For all registered applications */ + cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) { + ua_sess = lookup_session_by_app(usess, app); + if (ua_sess == NULL) { + /* Next app */ + 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) { + DBG2("Channel %s not found in session id %d for app pid %d." + "Skipping", uchan->name, usess->id, app->key.pid); + 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) { + 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 lttng_ht_iter iter, uiter; + struct lttng_ht_node_str *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 id %d", uchan->name, usess->id); + + rcu_read_lock(); + + /* For all registered applications */ + cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.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 */ + lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); + ua_chan_node = lttng_ht_iter_get_node_str(&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->ht, &uiter.iter, ua_event, + node.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 lttng_ht_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 id %d", + uchan->name, usess->id); + + rcu_read_lock(); + + /* For every registered applications */ + cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.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 lttng_ht_iter iter, uiter; + struct lttng_ht_node_str *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 id %d", + uevent->attr.name, usess->id); + + /* + * 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->ht, &iter.iter, app, node.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 */ + lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); + ua_chan_node = lttng_ht_iter_get_node_str(&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); + + 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) { + 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 lttng_ht_iter iter, uiter; + struct lttng_ht_node_str *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 id %d", + uevent->attr.name, usess->id); + + /* + * 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->ht, &iter.iter, app, node.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 */ + lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); + ua_chan_node = lttng_ht_iter_get_node_str(&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 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); + + 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->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"); + 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 lttng_ht_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; + } + + /* 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; + } + + /* Quiescent wait after stopping trace */ + ustctl_wait_quiescent(app->key.sock); + + /* 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); + 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; + } + } + + /* 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); + } + + rcu_read_unlock(); + + 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 lttng_ht_iter iter; + struct lttng_ht_node_ulong *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 = lttng_ht_iter_get_node_ulong(&iter); + if (node == NULL) { + /* 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 = lttng_ht_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); + + rcu_read_unlock(); + + /* Quiescent wait after stopping trace */ + ustctl_wait_quiescent(app->key.sock); + + return 0; + +error_rcu_unlock: + rcu_read_unlock(); + return -1; +} + +/* + * Start tracing for the UST session. + */ +int ust_app_start_trace_all(struct ltt_ust_session *usess) +{ + int ret = 0; + struct lttng_ht_iter iter; + struct ust_app *app; + + DBG("Starting all UST traces"); + + rcu_read_lock(); + + cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) { + ret = ust_app_start_trace(usess, app); + if (ret < 0) { + /* Continue to next apps even on error */ + continue; + } + } + + rcu_read_unlock(); + + return 0; +} + +/* + * Start tracing for the UST session. + */ +int ust_app_stop_trace_all(struct ltt_ust_session *usess) +{ + int ret = 0; + struct lttng_ht_iter iter; + struct ust_app *app; + + DBG("Stopping all UST traces"); + + rcu_read_lock(); - 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); + cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) { + ret = ust_app_stop_trace(usess, app); if (ret < 0) { - ERR("UST app open metadata failed for app pid:%d", - app->key.pid); - goto error; + /* Continue to next apps even on error */ + continue; } - - DBG2("UST metadata opened for app pid %d", app->key.pid); } - /* 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 error; - } + rcu_read_unlock(); - ret = snprintf(ua_sess->metadata->pathname, PATH_MAX, "%s/%s-%d", - pathname, app->name, app->key.pid); - if (ret < 0) { - PERROR("asprintf UST create stream"); - goto error; - } + return 0; +} - ret = mkdir(ua_sess->metadata->pathname, S_IRWXU | S_IRWXG); - if (ret < 0) { - PERROR("mkdir UST metadata"); - goto error; - } +/* + * Destroy app UST session. + */ +int ust_app_destroy_trace_all(struct ltt_ust_session *usess) +{ + int ret = 0; + struct lttng_ht_iter iter; + struct ust_app *app; + + DBG("Destroy all UST traces"); - ret = snprintf(ua_sess->metadata->pathname, PATH_MAX, "%s/%s-%d/metadata", - pathname, app->name, app->key.pid); + rcu_read_lock(); + + cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) { + ret = ust_app_destroy_trace(usess, app); if (ret < 0) { - PERROR("asprintf UST create stream"); - goto error; + /* Continue to next apps even on error */ + continue; } - - DBG2("UST metadata stream object created for app pid %d", - app->key.pid); } - return 0; + rcu_read_unlock(); -error: - return -1; + return 0; } /* - * Add channel to all ust app session. + * Add channels/events from UST global domain to registered apps at sock. */ -int ust_app_add_channel_all(struct ltt_ust_session *usess, - struct ltt_ust_channel *uchan) +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; + struct lttng_ht_iter iter, uiter; struct ust_app *app; struct ust_app_session *ua_sess; struct ust_app_channel *ua_chan; + struct ust_app_event *ua_event; - if (usess == NULL || uchan == NULL) { - ERR("Adding UST global channel to NULL values"); - ret = -1; + if (usess == NULL) { + ERR("No UST session on global update. Returning"); goto error; } - DBG2("UST app adding channel %s to global domain for session uid %d", - uchan->name, usess->uid); + DBG2("UST app global update for app sock %d for session id %d", sock, + usess->id); rcu_read_lock(); - /* For every UST applications registered */ - hashtable_get_first(ust_app_ht, &iter); - while ((node = hashtable_iter_get_node(&iter)) != NULL) { - app = caa_container_of(node, struct ust_app, node); + app = find_app_by_sock(sock); + if (app == NULL) { + ERR("Failed to update app sock %d", sock); + goto error; + } - /* Create session on the tracer side and add it to app session HT */ - ua_sess = create_ust_app_session(usess, app); + ua_sess = create_ust_app_session(usess, app); + if (ua_sess == NULL) { + goto error; + } + + /* + * 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->ht, &iter.iter, ua_chan, + node.node) { + ret = create_ust_channel(app, ua_sess, ua_chan); if (ret < 0) { - goto next; + /* FIXME: Should we quit here or continue... */ + continue; } - /* Create channel onto application */ - ua_chan = create_ust_app_channel(ua_sess, uchan, app); - if (ua_chan == NULL) { - goto next; + /* For each events */ + cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event, + node.node) { + ret = create_ust_event(app, ua_sess, ua_chan, ua_event); + if (ret < 0) { + /* FIXME: Should we quit here or continue... */ + continue; + } + } + } + + 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(); error: - return ret; + rcu_read_unlock(); + return; } -int ust_app_add_event_all(struct ltt_ust_session *usess, - struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) +/* + * 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 lttng_ht_node_str *ua_chan_node; + struct lttng_ht_iter iter, uiter; + struct ust_app_channel *ua_chan = NULL; struct ust_app_session *ua_sess; - struct ust_app_channel *ua_chan; - struct ust_app_event *ua_event; - - DBG2("UST app adding event %s to global domain for session uid %d", - uevent->attr.name, usess->uid); + struct ust_app *app; rcu_read_lock(); - /* For all registered applications */ - hashtable_get_first(ust_app_ht, &iter); - while ((node = hashtable_iter_get_node(&iter)) != NULL) { - app = caa_container_of(node, struct ust_app, node); - - /* Create session on the tracer side and add it to app session HT */ - ua_sess = create_ust_app_session(usess, app); - if (ret < 0) { - goto next; + cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) { + ua_sess = lookup_session_by_app(usess, app); + if (ua_sess == NULL) { + continue; } /* Lookup channel in the ust app session */ - ua_chan_node = hashtable_lookup(ua_sess->channels, - (void *)uchan->name, strlen(uchan->name), &iter); + 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) { - ERR("Channel %s not found in session uid %d. Skipping", - uchan->name, usess->uid); - goto next; + continue; } - ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); + ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, + node); - ua_event = create_ust_app_event(ua_sess, ua_chan, uevent, app); - if (ua_event == NULL) { - goto next; + ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app); + if (ret < 0) { + continue; } - -next: - /* Next applications */ - hashtable_get_next(ust_app_ht, &iter); } - rcu_read_unlock(); + rcu_read_unlock(); return ret; } -int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app) +/* + * 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_iter iter; - struct cds_lfht_node *node; + 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_channel *ua_chan; - - DBG("Starting tracing for ust app pid %d", app->key.pid); - - ua_sess = lookup_session_by_app(usess, app); - if (ua_sess == NULL) { - /* Only malloc can failed so something is really wrong */ - goto error; - } - - ret = create_ust_app_metadata(ua_sess, usess->pathname, app); - if (ret < 0) { - goto error; - } - - /* For each channel */ - hashtable_get_first(ua_sess->channels, &iter); - while ((node = hashtable_iter_get_node(&iter)) != NULL) { - ua_chan = caa_container_of(node, struct ust_app_channel, node); - - /* Create all streams */ - while (1) { - struct ltt_ust_stream *ustream; - - ustream = zmalloc(sizeof(*ustream)); - if (ustream == NULL) { - PERROR("zmalloc ust stream"); - continue; - } + 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, - &ustream->obj); - if (ret < 0) { - /* Got all streams */ - break; - } - ustream->handle = ustream->obj->handle; + rcu_read_lock(); - /* Order is important */ - cds_list_add_tail(&ustream->list, &ua_chan->streams.head); - ret = snprintf(ustream->pathname, PATH_MAX, "%s/%s-%d/%s_%u", - usess->pathname, app->name, app->key.pid, - 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); + cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) { + ua_sess = lookup_session_by_app(usess, app); + if (ua_sess == NULL) { + continue; } - /* Next applications */ - hashtable_get_next(ua_sess->channels, &iter); - } + /* 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); - /* Setup UST consumer socket and send fds to it */ - ret = ust_consumer_send_session(usess->consumer_fd, ua_sess); - if (ret < 0) { - goto error; - } + 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); - /* 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; + ret = create_ust_app_event_context(ua_sess, ua_event, &uctx->ctx, app); + if (ret < 0) { + continue; + } } - /* Quiescent wait after starting trace */ - ustctl_wait_quiescent(app->key.sock); - - return 0; - -error: - return -1; + rcu_read_unlock(); + return ret; } -int ust_app_start_trace_all(struct ltt_ust_session *usess) +/* + * 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; - struct cds_lfht_iter iter; - struct cds_lfht_node *node; + struct lttng_ht_iter iter; + struct lttng_ht_node_str *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("Starting all UST traces"); + DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid); 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); - ret = ust_app_start_trace(usess, app); + app = ust_app_find_by_pid(pid); + if (app == NULL) { + 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 is NULL, there is a code flow error */ + assert(ua_sess); + + /* Lookup channel in the ust app session */ + lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); + ua_chan_node = lttng_ht_iter_get_node_str(&iter); + /* 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); + + 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) { + ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); if (ret < 0) { - goto next; + goto error; } + } else { + ua_event = caa_container_of(ua_event_node, struct ust_app_event, node); -next: - /* Next applications */ - hashtable_get_next(ust_app_ht, &iter); + ret = enable_ust_app_event(ua_sess, ua_event, app); + if (ret < 0) { + goto error; + } } - rcu_read_unlock(); - return 0; +error: + rcu_read_unlock(); + return ret; } -void ust_app_global_update(struct ltt_ust_session *usess, int sock) +/* + * 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 *node; + struct lttng_ht_iter iter; + struct lttng_ht_node_str *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 ltt_ust_channel *uchan; - struct ltt_ust_event *uevent; + + DBG("UST app disabling event %s for PID %d", uevent->attr.name, pid); rcu_read_lock(); - if (usess == NULL) { - DBG2("No UST session on global update. Returning"); + 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("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 is NULL, there is a code flow error */ + assert(ua_sess); - app = find_app_by_sock(sock); - if (app == NULL) { - ERR("Failed to update app sock %d", sock); + /* Lookup channel in the ust app session */ + lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); + ua_chan_node = lttng_ht_iter_get_node_str(&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); - ua_sess = create_ust_app_session(usess, app); - if (ua_sess == NULL) { + 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) { + /* Event does not exist, skip disabling */ goto error; } + ua_event = caa_container_of(ua_event_node, struct ust_app_event, node); - 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 = create_ust_app_channel(ua_sess, uchan, app); - if (ua_chan == NULL) { - goto next_chan; - } - - hashtable_get_first(uchan->events, &iter); - while ((node = hashtable_iter_get_node(&iter)) != NULL) { - uevent = caa_container_of(node, struct ltt_ust_event, node); - - ua_event = create_ust_app_event(ua_sess, ua_chan, uevent, app); - if (ua_event == NULL) { - goto next_event; - } - -next_event: - hashtable_get_next(uchan->events, &iter); - } - -next_chan: - /* Next item in hash table */ - hashtable_get_next(usess->domain_global.channels, &iter); - } - - if (usess->start_trace) { - ret = ust_app_start_trace(usess, app); - if (ret < 0) { - goto error; - } - - DBG2("UST trace started for app pid %d", app->key.pid); + ret = disable_ust_app_event(ua_sess, ua_event, app); + if (ret < 0) { + goto error; } error: rcu_read_unlock(); - return; + return ret; }