#include <stddef.h>
#include <inttypes.h>
#include <time.h>
+#include <sys/prctl.h>
#include "clock.h"
#include <urcu-bp.h>
#include <helper.h>
#include "error.h"
+#include "tracepoint-internal.h"
#include "ltt-tracer.h"
#include "ltt-tracer-core.h"
#include "wait.h"
#include "../libringbuffer/shm.h"
#include "jhash.h"
+#define PROCNAME_LEN 17
+
/*
* The sessions mutex is the centralized mutex across UST tracing
* control and probe registration. All operations within this file are
static CDS_LIST_HEAD(sessions);
+/*
+ * Wildcard list, containing the active wildcards.
+ * Protected by ust lock.
+ */
+static CDS_LIST_HEAD(wildcard_list);
+
/*
* Pending probes hash table, containing the registered ltt events for
* which tracepoint probes are still missing. Protected by the sessions
struct ust_pending_probe {
struct ltt_event *event;
struct cds_hlist_node node;
+ enum lttng_ust_loglevel_type loglevel_type;
+ int loglevel;
char name[];
};
static
int _ltt_session_metadata_statedump(struct ltt_session *session);
+int ltt_loglevel_match(const struct lttng_event_desc *desc,
+ enum lttng_ust_loglevel_type req_type,
+ int req_loglevel)
+{
+ int ev_loglevel;
+
+ if (req_type == LTTNG_UST_LOGLEVEL_ALL)
+ return 1;
+ if (!desc->loglevel)
+ ev_loglevel = TRACE_DEFAULT;
+ else
+ ev_loglevel = *(*desc->loglevel);
+ switch (req_type) {
+ case LTTNG_UST_LOGLEVEL_RANGE:
+ if (ev_loglevel <= req_loglevel || req_loglevel == -1)
+ return 1;
+ else
+ return 0;
+ case LTTNG_UST_LOGLEVEL_SINGLE:
+ if (ev_loglevel == req_loglevel || req_loglevel == -1)
+ return 1;
+ else
+ return 0;
+ case LTTNG_UST_LOGLEVEL_ALL:
+ default:
+ return 1;
+ }
+}
+
+/*
+ * Return wildcard for a given event name if the event name match the
+ * one of the wildcards.
+ * Must be called with ust lock held.
+ * Returns NULL if not present.
+ */
+static
+struct wildcard_entry *match_wildcard(const struct lttng_event_desc *desc)
+{
+ struct wildcard_entry *e;
+
+ cds_list_for_each_entry(e, &wildcard_list, list) {
+ /* If only contain '*' */
+ if (strlen(e->name) == 1)
+ goto possible_match;
+ /* Compare excluding final '*' */
+ if (!strncmp(desc->name, e->name, strlen(e->name) - 1))
+ goto possible_match;
+ continue; /* goto next, no match */
+ possible_match:
+ if (ltt_loglevel_match(desc,
+ e->loglevel_type,
+ e->loglevel)) {
+ return e;
+ }
+ /* no match, loop to next */
+ }
+ return NULL;
+}
+
/*
* called at event creation if probe is missing.
* called with session mutex held.
*/
static
-int add_pending_probe(struct ltt_event *event, const char *name)
+int add_pending_probe(struct ltt_event *event, const char *name,
+ enum lttng_ust_loglevel_type loglevel_type,
+ int loglevel)
{
struct cds_hlist_head *head;
struct ust_pending_probe *e;
return -ENOMEM;
memcpy(&e->name[0], name, name_len + 1);
e->name[name_len] = '\0';
+ e->loglevel_type = loglevel_type;
+ e->loglevel = loglevel;
cds_hlist_add_head(&e->node, head);
e->event = event;
event->pending_probe = e;
{
struct wildcard_entry *wildcard;
- /* TODO: check if loglevel match */
- wildcard = match_wildcard(desc->name);
+ wildcard = match_wildcard(desc);
if (strcmp(desc->name, "lttng_ust:metadata") && wildcard) {
struct session_wildcard *sw;
struct ltt_event *event;
struct ltt_channel *chan;
- /* TODO: check if loglevel match */
- if (strncmp(name, e->name, LTTNG_UST_SYM_NAME_LEN - 1))
+ if (!ltt_loglevel_match(desc,
+ e->loglevel_type,
+ e->loglevel)) {
+ continue;
+ }
+ if (strncmp(name, e->name, LTTNG_UST_SYM_NAME_LEN - 1)) {
continue;
+ }
event = e->event;
chan = event->chan;
assert(!event->desc);
chan->ops->channel_destroy(chan);
}
-int ltt_wildcard_create(struct ltt_channel *chan,
- struct lttng_ust_event *event_param,
- struct session_wildcard **_sw)
-{
- struct session_wildcard *sw;
-
- sw = add_wildcard(event_param->name, chan, event_param);
- if (!sw || IS_ERR(sw)) {
- return PTR_ERR(sw);
- }
- *_sw = sw;
- return 0;
-}
-
-static
-void _ltt_wildcard_destroy(struct session_wildcard *sw)
-{
- _remove_wildcard(sw);
-}
-
/*
* Supports event creation while tracing session is active.
*/
void *filter,
struct ltt_event **_event)
{
+ const struct lttng_event_desc *desc = NULL; /* silence gcc */
struct ltt_event *event;
int ret = 0;
goto exist;
}
}
+
+ /*
+ * Check if loglevel match. Refuse to connect event if not.
+ */
+ if (event_param->instrumentation == LTTNG_UST_TRACEPOINT) {
+ desc = ltt_event_get(event_param->name);
+ if (desc) {
+ if (!ltt_loglevel_match(desc,
+ event_param->loglevel_type,
+ event_param->loglevel)) {
+ ret = -EPERM;
+ goto no_loglevel_match;
+ }
+ }
+ /*
+ * If descriptor is not there, it will be added to
+ * pending probes.
+ */
+ }
event = zmalloc(sizeof(struct ltt_event));
if (!event) {
ret = -ENOMEM;
cmm_smp_wmb();
switch (event_param->instrumentation) {
case LTTNG_UST_TRACEPOINT:
- event->desc = ltt_event_get(event_param->name);
- /* TODO: check if loglevel match */
+ event->desc = desc;
if (event->desc) {
ret = __tracepoint_probe_register(event_param->name,
event->desc->probe_callback,
* waiting for the probe to register, and the event->id
* stays unallocated.
*/
- ret = add_pending_probe(event, event_param->name);
+ ret = add_pending_probe(event, event_param->name,
+ event_param->loglevel_type,
+ event_param->loglevel);
if (ret)
goto add_pending_error;
}
register_error:
free(event);
cache_error:
+no_loglevel_match:
exist:
full:
return ret;
struct ltt_event *event)
{
int ret = 0;
+ int loglevel = TRACE_DEFAULT;
if (event->metadata_dumped || !CMM_ACCESS_ONCE(session->active))
return 0;
if (ret)
goto end;
- if (event->desc->loglevel) {
- const int *ll_entry;
+ if (event->desc->loglevel)
+ loglevel = *(*event->desc->loglevel);
- ll_entry = *event->desc->loglevel;
- ret = lttng_metadata_printf(session,
- " loglevel = %d;\n",
- ll_entry);
- if (ret)
- goto end;
- }
+ ret = lttng_metadata_printf(session,
+ " loglevel = %d;\n",
+ loglevel);
+ if (ret)
+ goto end;
if (event->ctx) {
ret = lttng_metadata_printf(session,
struct ltt_channel *chan;
struct ltt_event *event;
int ret = 0;
+ char procname[PROCNAME_LEN] = "";
if (!CMM_ACCESS_ONCE(session->active))
return 0;
if (ret)
goto end;
+ /* ignore error, just use empty string if error. */
+ (void) prctl(PR_GET_NAME, (unsigned long) procname, 0, 0, 0);
+ procname[PROCNAME_LEN - 1] = '\0';
+ ret = lttng_metadata_printf(session,
+ "env {\n"
+ " vpid = %d;\n"
+ " procname = \"%s\";\n"
+ " domain = %s;\n"
+ "};\n\n",
+ (int) getpid(),
+ procname,
+ "ust"
+ );
+ if (ret)
+ goto end;
+
ret = lttng_metadata_printf(session,
"clock {\n"
" name = %s;\n",
cds_list_for_each_entry_safe(session, tmpsession, &sessions, list)
ltt_session_destroy(session);
}
+
+/* WILDCARDS */
+
+static
+int wildcard_same_loglevel(struct wildcard_entry *e,
+ enum lttng_ust_loglevel_type loglevel_type,
+ int loglevel)
+{
+ if (e->loglevel_type == loglevel_type && e->loglevel == loglevel)
+ return 1;
+ else
+ return 0;
+}
+
+#if 0
+static
+int wildcard_is_within(struct wildcard_entry *e,
+ enum lttng_ust_loglevel_type loglevel_type,
+ int loglevel)
+{
+ if (e->loglevel_type == LTTNG_UST_LOGLEVEL_ALL
+ || e->loglevel == -1)
+ return 1;
+ switch (e->loglevel_type) {
+ case LTTNG_UST_LOGLEVEL_RANGE:
+ switch (loglevel_type) {
+ case LTTNG_UST_LOGLEVEL_RANGE:
+ if (e->loglevel >= loglevel)
+ return 1;
+ else
+ return 0;
+ case LTTNG_UST_LOGLEVEL_SINGLE:
+ if (e->loglevel <= 0 && loglevel == 0)
+ return 1;
+ else
+ return 0;
+ }
+ case LTTNG_UST_LOGLEVEL_SINGLE:
+ switch (loglevel_type) {
+ case LTTNG_UST_LOGLEVEL_RANGE:
+ if (loglevel <= 0)
+ return 1;
+ else
+ return 0;
+ case LTTNG_UST_LOGLEVEL_SINGLE:
+ if (e->loglevel == loglevel)
+ return 1;
+ else
+ return 0;
+ }
+ }
+}
+#endif
+
+/*
+ * Add the wildcard to the wildcard list. Must be called with
+ * ust lock held.
+ */
+static
+struct session_wildcard *add_wildcard(struct ltt_channel *chan,
+ struct lttng_ust_event *event_param)
+{
+ struct wildcard_entry *e;
+ struct session_wildcard *sw;
+ size_t name_len = strlen(event_param->name) + 1;
+ int found = 0;
+
+ /*
+ * Try to find global wildcard entry. Given that this is shared
+ * across all sessions, we need to check for exact loglevel
+ * match, not just whether contained within the existing ones.
+ */
+ cds_list_for_each_entry(e, &wildcard_list, list) {
+ if (!strncmp(event_param->name, e->name,
+ LTTNG_UST_SYM_NAME_LEN - 1)) {
+ if (wildcard_same_loglevel(e,
+ event_param->loglevel_type,
+ event_param->loglevel)) {
+ found = 1;
+ break;
+ }
+ }
+ }
+
+ if (!found) {
+ /*
+ * Create global wildcard entry if not found. Using
+ * zmalloc here to allocate a variable length element.
+ * Could cause some memory fragmentation if overused.
+ */
+ e = zmalloc(sizeof(struct wildcard_entry) + name_len);
+ if (!e)
+ return ERR_PTR(-ENOMEM);
+ memcpy(&e->name[0], event_param->name, name_len);
+ cds_list_add(&e->list, &wildcard_list);
+ CDS_INIT_LIST_HEAD(&e->session_list);
+ }
+
+ /* session wildcard */
+ cds_list_for_each_entry(sw, &e->session_list, session_list) {
+ if (chan == sw->chan) {
+ DBG("wildcard %s busy for this channel",
+ event_param->name);
+ return ERR_PTR(-EEXIST); /* Already there */
+ }
+ }
+ sw = zmalloc(sizeof(struct session_wildcard));
+ if (!sw)
+ return ERR_PTR(-ENOMEM);
+ sw->chan = chan;
+ sw->enabled = 1;
+ memcpy(&sw->event_param, event_param, sizeof(sw->event_param));
+ sw->event_param.instrumentation = LTTNG_UST_TRACEPOINT;
+ sw->event_param.loglevel_type = event_param->loglevel_type;
+ sw->event_param.loglevel = event_param->loglevel;
+ CDS_INIT_LIST_HEAD(&sw->events);
+ cds_list_add(&sw->list, &chan->session->wildcards);
+ cds_list_add(&sw->session_list, &e->session_list);
+ sw->entry = e;
+ ltt_probes_create_wildcard_events(e, sw);
+ return sw;
+}
+
+/*
+ * Remove the wildcard from the wildcard list. Must be called with
+ * ust_lock held. Only called at session teardown.
+ */
+static
+void _remove_wildcard(struct session_wildcard *wildcard)
+{
+ struct ltt_event *ev, *tmp;
+
+ /*
+ * Just remove the events owned (for enable/disable) by this
+ * wildcard from the list. The session teardown will take care
+ * of freeing the event memory.
+ */
+ cds_list_for_each_entry_safe(ev, tmp, &wildcard->events,
+ wildcard_list) {
+ cds_list_del(&ev->wildcard_list);
+ }
+ cds_list_del(&wildcard->session_list);
+ cds_list_del(&wildcard->list);
+ if (cds_list_empty(&wildcard->entry->session_list)) {
+ cds_list_del(&wildcard->entry->list);
+ free(wildcard->entry);
+ }
+ free(wildcard);
+}
+
+int ltt_wildcard_create(struct ltt_channel *chan,
+ struct lttng_ust_event *event_param,
+ struct session_wildcard **_sw)
+{
+ struct session_wildcard *sw;
+
+ sw = add_wildcard(chan, event_param);
+ if (!sw || IS_ERR(sw)) {
+ return PTR_ERR(sw);
+ }
+ *_sw = sw;
+ return 0;
+}
+
+static
+void _ltt_wildcard_destroy(struct session_wildcard *sw)
+{
+ _remove_wildcard(sw);
+}
+
+int ltt_wildcard_enable(struct session_wildcard *wildcard)
+{
+ struct ltt_event *ev;
+ int ret;
+
+ if (wildcard->enabled)
+ return -EEXIST;
+ cds_list_for_each_entry(ev, &wildcard->events, wildcard_list) {
+ ret = ltt_event_enable(ev);
+ if (ret) {
+ DBG("Error: enable error.\n");
+ return ret;
+ }
+ }
+ wildcard->enabled = 1;
+ return 0;
+}
+
+int ltt_wildcard_disable(struct session_wildcard *wildcard)
+{
+ struct ltt_event *ev;
+ int ret;
+
+ if (!wildcard->enabled)
+ return -EEXIST;
+ cds_list_for_each_entry(ev, &wildcard->events, wildcard_list) {
+ ret = ltt_event_disable(ev);
+ if (ret) {
+ DBG("Error: disable error.\n");
+ return ret;
+ }
+ }
+ wildcard->enabled = 0;
+ return 0;
+}
projects / lttng-ust.git / blobdiff