X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=lttng-sessiond%2Fust-app.c;fp=lttng-sessiond%2Fust-app.c;h=0000000000000000000000000000000000000000;hp=5976270604cd0ffd9e271a38c669bbbe8f956c6f;hb=10a8a2237343699e3923d87e24dbf2d7fe225377;hpb=734f79bf717d87817623d382c59086dc9e8ef610 diff --git a/lttng-sessiond/ust-app.c b/lttng-sessiond/ust-app.c deleted file mode 100644 index 597627060..000000000 --- a/lttng-sessiond/ust-app.c +++ /dev/null @@ -1,2408 +0,0 @@ -/* - * Copyright (C) 2011 - David Goulet - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; only version 2 - * of the License. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. - */ - -#define _GNU_SOURCE -#include -#include -#include -#include -#include -#include -#include -#include - -#include - -#include -#include -#include - -#include "common/runas.h" -#include "ust-app.h" -#include "ust-consumer.h" -#include "ust-ctl.h" - -/* - * Delete ust context safely. RCU read lock must be held before calling - * this function. - */ -static -void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx) -{ - if (ua_ctx->obj) { - ustctl_release_object(sock, ua_ctx->obj); - free(ua_ctx->obj); - } - free(ua_ctx); -} - -/* - * Delete ust app event safely. RCU read lock must be held before calling - * this function. - */ -static -void delete_ust_app_event(int sock, struct ust_app_event *ua_event) -{ - int ret; - struct lttng_ht_iter iter; - struct ust_app_ctx *ua_ctx; - - /* Destroy each context of event */ - cds_lfht_for_each_entry(ua_event->ctx->ht, &iter.iter, ua_ctx, - node.node) { - ret = lttng_ht_del(ua_event->ctx, &iter); - assert(!ret); - delete_ust_app_ctx(sock, ua_ctx); - } - lttng_ht_destroy(ua_event->ctx); - - if (ua_event->obj != NULL) { - ustctl_release_object(sock, ua_event->obj); - free(ua_event->obj); - } - free(ua_event); -} - -/* - * Delete ust app stream safely. RCU read lock must be held before calling - * this function. - */ -static -void delete_ust_app_stream(int sock, struct ltt_ust_stream *stream) -{ - if (stream->obj) { - ustctl_release_object(sock, stream->obj); - free(stream->obj); - } - free(stream); -} - -/* - * Delete ust app channel safely. RCU read lock must be held before calling - * this function. - */ -static -void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan) -{ - 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; - - /* 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); - } - - /* 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); - - if (ua_chan->obj != NULL) { - ustctl_release_object(sock, ua_chan->obj); - free(ua_chan->obj); - } - free(ua_chan); -} - -/* - * Delete ust app session safely. RCU read lock must be held before calling - * this function. - */ -static -void delete_ust_app_session(int sock, struct ust_app_session *ua_sess) -{ - int ret; - struct lttng_ht_iter iter; - struct ust_app_channel *ua_chan; - - if (ua_sess->metadata) { - if (ua_sess->metadata->stream_obj) { - ustctl_release_object(sock, ua_sess->metadata->stream_obj); - free(ua_sess->metadata->stream_obj); - } - if (ua_sess->metadata->obj) { - ustctl_release_object(sock, ua_sess->metadata->obj); - free(ua_sess->metadata->obj); - } - } - - 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); - - if (ua_sess->handle != -1) { - ustctl_release_handle(sock, ua_sess->handle); - } - free(ua_sess); -} - -/* - * Delete a traceable application structure from the global list. Never call - * this function outside of a call_rcu call. - */ -static -void delete_ust_app(struct ust_app *app) -{ - int ret, sock; - struct lttng_ht_iter iter; - struct ust_app_session *ua_sess; - - rcu_read_lock(); - - /* Delete ust app sessions info */ - sock = app->key.sock; - app->key.sock = -1; - - /* 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); - - /* - * 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); - - rcu_read_unlock(); -} - -/* - * URCU intermediate call to delete an UST app. - */ -static -void delete_ust_app_rcu(struct rcu_head *head) -{ - 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); - - 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) -{ - 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->handle = -1; - ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); - - return ua_sess; - -error: - return NULL; -} - -/* - * 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 = 1; - ua_chan->handle = -1; - 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); - - /* 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; - -error: - return NULL; -} - -/* - * 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 = 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); - - return ua_event; - -error: - return NULL; -} - -/* - * Alloc new UST app context. - */ -static -struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context *uctx) -{ - struct ust_app_ctx *ua_ctx; - - ua_ctx = zmalloc(sizeof(struct ust_app_ctx)); - if (ua_ctx == NULL) { - goto error; - } - - if (uctx) { - memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx)); - } - - DBG3("UST app context %d allocated", ua_ctx->ctx.ctx); - -error: - return ua_ctx; -} - -/* - * 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; - - lttng_ht_lookup(ust_app_sock_key_map, (void *)((unsigned long) sock), - &iter); - node = lttng_ht_iter_get_node_ulong(&iter); - if (node == NULL) { - DBG2("UST app find by sock %d key not found", sock); - goto error; - } - key = caa_container_of(node, struct ust_app_key, node); - - lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) key->pid), &iter); - 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); - -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 with ret %d", - app->key.pid, ret); - 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) { - if (ret == -EEXIST) { - ret = 0; - goto error; - } - 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 == 0) { - ret = disable_ust_event(app, ua_sess, ua_event); - if (ret < 0) { - /* - * If we hit an EPERM, something is wrong with our disable call. If - * we get an EEXIST, there is a problem on the tracer side since we - * just created it. - */ - switch (ret) { - case -EPERM: - /* Code flow problem */ - assert(0); - case -EEXIST: - /* It's OK for our use case. */ - ret = 0; - break; - default: - break; - } - 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'; - - ua_event->enabled = uevent->enabled; - - /* Copy event attributes */ - memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr)); - - cds_lfht_for_each_entry(uevent->ctx->ht, &iter.iter, uctx, node.node) { - ua_ctx = alloc_ust_app_ctx(&uctx->ctx); - if (ua_ctx == NULL) { - /* malloc() failed. We should simply stop */ - return; - } - - lttng_ht_node_init_ulong(&ua_ctx->node, - (unsigned long) ua_ctx->ctx.ctx); - lttng_ht_add_unique_ulong(ua_event->ctx, &ua_ctx->node); - } -} - -/* - * Copy 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("UST app shadow copy of channel %s started", 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)); - - ua_chan->enabled = uchan->enabled; - - 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("UST app shadow copy of channel %s done", ua_chan->name); -} - -/* - * 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 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. */ - cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter, - uchan, node.node) { - struct lttng_ht_iter uiter; - - 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) { - /* Session exist. Contiuing. */ - continue; - } - - 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 FIXME: Might want to do handle ENOMEM .. */ - continue; - } - - 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 - * id. - */ -static struct ust_app_session *lookup_session_by_app( - struct ltt_ust_session *usess, struct ust_app *app) -{ - struct lttng_ht_iter iter; - struct lttng_ht_node_ulong *node; - - __lookup_session_by_app(usess, app, &iter); - node = lttng_ht_iter_get_node_ulong(&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 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 end; - } - shadow_copy_session(ua_sess, usess, app); - } - - if (ua_sess->handle == -1) { - ret = ustctl_create_session(app->key.sock); - if (ret < 0) { - ERR("Creating session for app pid %d", app->key.pid); - goto error; - } - - ua_sess->handle = ret; - - /* Add ust app session to app's HT */ - 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); - } - -end: - return ua_sess; - -error: - delete_ust_app_session(-1, ua_sess); - 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 lttng_ht_iter iter; - struct lttng_ht_node_ulong *node; - struct ust_app_ctx *ua_ctx; - - DBG2("UST app adding context to channel %s", ua_chan->name); - - 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) { - 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 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) { - ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); - goto end; - } - - ua_chan = alloc_ust_app_channel(uchan->name, &uchan->attr); - if (ua_chan == NULL) { - /* Only malloc can fail here */ - goto error; - } - shadow_copy_channel(ua_chan, uchan); - - ret = create_ust_channel(app, ua_sess, ua_chan); - if (ret < 0) { - /* Not found previously means that it does not exist on the tracer */ - assert(ret != -EEXIST); - goto error; - } - - lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); - - DBG2("UST app create channel %s for PID %d completed", ua_chan->name, - app->key.pid); - -end: - return ua_chan; - -error: - delete_ust_app_channel(-1, ua_chan); - 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 lttng_ht_iter iter; - struct lttng_ht_node_str *ua_event_node; - struct ust_app_event *ua_event; - - /* Get event node */ - lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter); - ua_event_node = lttng_ht_iter_get_node_str(&iter); - if (ua_event_node != NULL) { - ret = -EEXIST; - 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 end; - } - 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) { - /* Not found previously means that it does not exist on the tracer */ - assert(ret != -EEXIST); - goto error; - } - - lttng_ht_add_unique_str(ua_chan->events, &ua_event->node); - - DBG2("UST app create event %s for PID %d completed", ua_event->name, - app->key.pid); - -end: - return ret; - -error: - /* Valid. Calling here is already in a read side lock */ - delete_ust_app_event(-1, ua_event); - 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; - - if (ua_sess->metadata == NULL) { - /* Allocate UST metadata */ - ua_sess->metadata = trace_ust_create_metadata(pathname); - if (ua_sess->metadata == NULL) { - /* malloc() failed */ - goto error; - } - - ret = open_ust_metadata(app, ua_sess); - if (ret < 0) { - DBG3("Opening metadata failed. Cleaning up memory"); - - /* Cleanup failed metadata struct */ - free(ua_sess->metadata); - /* - * This is very important because delete_ust_app_session check if - * the pointer is null or not in order to delete the metadata. - */ - ua_sess->metadata = NULL; - goto error; - } - - 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 = run_as_mkdir(ua_sess->path, S_IRWXU | S_IRWXG, - ua_sess->uid, ua_sess->gid); - if (ret < 0) { - PERROR("mkdir UST metadata"); - goto error; - } - - ret = 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) -{ - struct lttng_ht_iter iter; - struct ust_app *app; - struct ust_app_session *ua_sess; - struct ust_app_channel *ua_chan; - - /* Very wrong code flow */ - assert(usess); - assert(uchan); - - 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) { - /* Major problem here and it's maybe the tracer or malloc() */ - goto error; - } - - /* Create channel onto application */ - ua_chan = create_ust_app_channel(ua_sess, uchan, app); - if (ua_chan == NULL) { - /* Major problem here and it's maybe the tracer or malloc() */ - goto error; - } - } - - rcu_read_unlock(); - - return 0; - -error: - return -1; -} - -/* - * 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); - - 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) { - if (ret != -EEXIST) { - /* Possible value at this point: -ENOMEM. If so, we stop! */ - break; - } - DBG2("UST app event %s already exist on app PID %d", - uevent->attr.name, app->key.pid); - 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; - } - - /* Not started, continuing. */ - if (ua_sess->started == 0) { - goto end; - } - - /* 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 with ret %d", - app->key.pid, ua_chan->name, 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 with ret %d", app->key.pid, - ret); - } - - ua_sess->started = 0; - -end: - 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); - obj.handle = ua_sess->handle; - obj.shm_fd = -1; - obj.wait_fd = -1; - obj.memory_map_size = 0; - ustctl_release_object(app->key.sock, &obj); - - delete_ust_app_session(app->key.sock, ua_sess); - - 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(); - - cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) { - ret = ust_app_stop_trace(usess, app); - if (ret < 0) { - /* 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 lttng_ht_iter iter; - struct ust_app *app; - - DBG("Destroy all UST traces"); - - 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) { - /* Continue to next apps even on error */ - continue; - } - } - - rcu_read_unlock(); - - return 0; -} - -/* - * 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 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) { - ERR("No UST session on global update. Returning"); - goto error; - } - - DBG2("UST app global update for app sock %d for session id %d", sock, - usess->id); - - rcu_read_lock(); - - app = find_app_by_sock(sock); - if (app == NULL) { - ERR("Failed to update app sock %d", sock); - goto error; - } - - 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) { - /* FIXME: Should we quit here or continue... */ - continue; - } - - /* 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; - } - - DBG2("UST trace started for app pid %d", app->key.pid); - } - -error: - rcu_read_unlock(); - return; -} - -/* - * 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 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 *app; - - rcu_read_lock(); - - 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 */ - 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); - - ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app); - if (ret < 0) { - continue; - } - } - - rcu_read_unlock(); - return ret; -} - -/* - * Add context to a specific event in a channel for global UST domain. - */ -int ust_app_add_ctx_event_glb(struct ltt_ust_session *usess, - struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, - struct ltt_ust_context *uctx) -{ - int ret = 0; - struct lttng_ht_node_str *ua_chan_node, *ua_event_node; - struct lttng_ht_iter iter, uiter; - struct ust_app_session *ua_sess; - struct ust_app_event *ua_event; - struct ust_app_channel *ua_chan = NULL; - struct ust_app *app; - - rcu_read_lock(); - - cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) { - ua_sess = lookup_session_by_app(usess, app); - if (ua_sess == NULL) { - continue; - } - - /* Lookup channel in the ust app session */ - lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); - ua_chan_node = lttng_ht_iter_get_node_str(&uiter); - if (ua_chan_node == NULL) { - continue; - } - ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, - node); - - lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter); - ua_event_node = lttng_ht_iter_get_node_str(&uiter); - if (ua_event_node == NULL) { - continue; - } - ua_event = caa_container_of(ua_event_node, struct ust_app_event, - node); - - ret = create_ust_app_event_context(ua_sess, ua_event, &uctx->ctx, app); - if (ret < 0) { - continue; - } - } - - rcu_read_unlock(); - return ret; -} - -/* - * Enable event for a channel from a UST session for a specific PID. - */ -int 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 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("UST app enabling event %s for PID %d", uevent->attr.name, pid); - - rcu_read_lock(); - - 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 error; - } - } else { - ua_event = caa_container_of(ua_event_node, struct ust_app_event, node); - - ret = enable_ust_app_event(ua_sess, ua_event, app); - if (ret < 0) { - goto error; - } - } - -error: - rcu_read_unlock(); - return ret; -} - -/* - * 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 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("UST app disabling event %s for PID %d", uevent->attr.name, pid); - - rcu_read_lock(); - - 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; - } - - 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 (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); - - 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); - - ret = disable_ust_app_event(ua_sess, ua_event, app); - if (ret < 0) { - goto error; - } - -error: - rcu_read_unlock(); - return ret; -}