X-Git-Url: http://git.efficios.com/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fbin%2Flttng-sessiond%2Fagent.c;h=35f0e578a0da725863f1b07be9d385a577371ea2;hp=1cd70e8c5f21f82ec2563ff7dd2a6c1766e85ed5;hb=890d8fe47755c3bad936389cf48ffa141cff41c9;hpb=971da06a61170301dc28c2203ef0679c3024e21d

diff --git a/src/bin/lttng-sessiond/agent.c b/src/bin/lttng-sessiond/agent.c
index 1cd70e8c5..35f0e578a 100644
--- a/src/bin/lttng-sessiond/agent.c
+++ b/src/bin/lttng-sessiond/agent.c
@@ -15,7 +15,6 @@
  * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
-#define _GNU_SOURCE
 #define _LGPL_SOURCE
 #include <assert.h>
 #include <urcu/uatomic.h>
@@ -28,6 +27,44 @@
 #include "agent.h"
 #include "ust-app.h"
 #include "utils.h"
+#include "error.h"
+
+#define AGENT_RET_CODE_INDEX(code) (code - AGENT_RET_CODE_SUCCESS)
+
+/*
+ * Human readable agent return code.
+ */
+static const char *error_string_array[] = {
+	[ AGENT_RET_CODE_INDEX(AGENT_RET_CODE_SUCCESS) ] = "Success",
+	[ AGENT_RET_CODE_INDEX(AGENT_RET_CODE_INVALID) ] = "Invalid command",
+	[ AGENT_RET_CODE_INDEX(AGENT_RET_CODE_UNKNOWN_NAME) ] = "Unknown logger name",
+
+	/* Last element */
+	[ AGENT_RET_CODE_INDEX(AGENT_RET_CODE_NR) ] = "Unknown code",
+};
+
+static
+void log_reply_code(uint32_t in_reply_ret_code)
+{
+	int level = PRINT_DBG3;
+	/*
+	 * reply_ret_code and in_reply_ret_code are kept separate to have a
+	 * sanitized value (used to retrieve the human readable string) and the
+	 * original value which is logged as-is.
+	 */
+	uint32_t reply_ret_code = in_reply_ret_code;
+
+	if (reply_ret_code < AGENT_RET_CODE_SUCCESS ||
+			reply_ret_code >= AGENT_RET_CODE_NR) {
+		reply_ret_code = AGENT_RET_CODE_NR;
+		level = PRINT_ERR;
+	}
+
+	LOG(level, "Agent replied with retcode: %s (%"PRIu32")",
+			error_string_array[AGENT_RET_CODE_INDEX(
+			reply_ret_code)],
+			in_reply_ret_code);
+}
 
 /*
  * Match function for the events hash table lookup by name.
@@ -65,6 +102,7 @@ static int ht_match_event(struct cds_lfht_node *node,
 {
 	struct agent_event *event;
 	const struct agent_ht_key *key;
+	int ll_match;
 
 	assert(node);
 	assert(_key);
@@ -79,14 +117,15 @@ static int ht_match_event(struct cds_lfht_node *node,
 		goto no_match;
 	}
 
-	if (event->loglevel != key->loglevel) {
-		if (event->loglevel_type == LTTNG_EVENT_LOGLEVEL_ALL &&
-				key->loglevel == 0 && event->loglevel == -1) {
-			goto match;
-		}
+	/* Event loglevel value and type. */
+	ll_match = loglevels_match(event->loglevel_type,
+		event->loglevel_value, key->loglevel_type,
+		key->loglevel_value, LTTNG_EVENT_LOGLEVEL_ALL);
+
+	if (!ll_match) {
 		goto no_match;
 	}
-match:
+
 	return 1;
 
 no_match:
@@ -107,7 +146,8 @@ static void add_unique_agent_event(struct lttng_ht *ht,
 	assert(event);
 
 	key.name = event->name;
-	key.loglevel = event->loglevel;
+	key.loglevel_value = event->loglevel_value;
+	key.loglevel_type = event->loglevel_type;
 
 	node_ptr = cds_lfht_add_unique(ht->ht,
 			ht->hash_fct(event->node.key, lttng_ht_seed),
@@ -125,7 +165,7 @@ static void destroy_event_agent_rcu(struct rcu_head *head)
 	struct agent_event *event =
 		caa_container_of(node, struct agent_event, node);
 
-	free(event);
+	agent_destroy_event(event);
 }
 
 /*
@@ -235,6 +275,7 @@ static ssize_t list_events(struct agent_app *app, struct lttng_event **events)
 	int ret, i, len = 0, offset = 0;
 	uint32_t nb_event;
 	size_t data_size;
+	uint32_t reply_ret_code;
 	struct lttng_event *tmp_events = NULL;
 	struct lttcomm_agent_list_reply *reply = NULL;
 	struct lttcomm_agent_list_reply_hdr reply_hdr;
@@ -257,14 +298,14 @@ static ssize_t list_events(struct agent_app *app, struct lttng_event **events)
 		goto error_io;
 	}
 
-	switch (be32toh(reply_hdr.ret_code)) {
+	reply_ret_code = be32toh(reply_hdr.ret_code);
+	log_reply_code(reply_ret_code);
+	switch (reply_ret_code) {
 	case AGENT_RET_CODE_SUCCESS:
 		data_size = be32toh(reply_hdr.data_size) + sizeof(*reply);
 		break;
 	default:
-		ERR("Agent returned an unknown code: %" PRIu32,
-				be32toh(reply_hdr.ret_code));
-		ret = LTTNG_ERR_FATAL;
+		ret = LTTNG_ERR_UNK;
 		goto error;
 	}
 
@@ -320,6 +361,7 @@ static int enable_event(struct agent_app *app, struct agent_event *event)
 {
 	int ret;
 	uint64_t data_size;
+	uint32_t reply_ret_code;
 	struct lttcomm_agent_enable msg;
 	struct lttcomm_agent_generic_reply reply;
 
@@ -338,7 +380,7 @@ static int enable_event(struct agent_app *app, struct agent_event *event)
 	}
 
 	memset(&msg, 0, sizeof(msg));
-	msg.loglevel = event->loglevel;
+	msg.loglevel_value = event->loglevel_value;
 	msg.loglevel_type = event->loglevel_type;
 	strncpy(msg.name, event->name, sizeof(msg.name));
 	ret = send_payload(app->sock, &msg, sizeof(msg));
@@ -351,16 +393,16 @@ static int enable_event(struct agent_app *app, struct agent_event *event)
 		goto error_io;
 	}
 
-	switch (be32toh(reply.ret_code)) {
+	reply_ret_code = be32toh(reply.ret_code);
+	log_reply_code(reply_ret_code);
+	switch (reply_ret_code) {
 	case AGENT_RET_CODE_SUCCESS:
 		break;
 	case AGENT_RET_CODE_UNKNOWN_NAME:
 		ret = LTTNG_ERR_UST_EVENT_NOT_FOUND;
 		goto error;
 	default:
-		ERR("Agent returned an unknown code: %" PRIu32,
-				be32toh(reply.ret_code));
-		ret = LTTNG_ERR_FATAL;
+		ret = LTTNG_ERR_UNK;
 		goto error;
 	}
 
@@ -382,6 +424,7 @@ static int disable_event(struct agent_app *app, struct agent_event *event)
 {
 	int ret;
 	uint64_t data_size;
+	uint32_t reply_ret_code;
 	struct lttcomm_agent_disable msg;
 	struct lttcomm_agent_generic_reply reply;
 
@@ -411,16 +454,16 @@ static int disable_event(struct agent_app *app, struct agent_event *event)
 		goto error_io;
 	}
 
-	switch (be32toh(reply.ret_code)) {
+	reply_ret_code = be32toh(reply.ret_code);
+	log_reply_code(reply_ret_code);
+	switch (reply_ret_code) {
 	case AGENT_RET_CODE_SUCCESS:
 		break;
 	case AGENT_RET_CODE_UNKNOWN_NAME:
 		ret = LTTNG_ERR_UST_EVENT_NOT_FOUND;
 		goto error;
 	default:
-		ERR("Agent returned an unknown code: %" PRIu32,
-				be32toh(reply.ret_code));
-		ret = LTTNG_ERR_FATAL;
+		ret = LTTNG_ERR_UNK;
 		goto error;
 	}
 
@@ -494,11 +537,14 @@ error:
 int agent_disable_event(struct agent_event *event,
 		enum lttng_domain_type domain)
 {
-	int ret;
+	int ret = LTTNG_OK;
 	struct agent_app *app;
 	struct lttng_ht_iter iter;
 
 	assert(event);
+	if (!event->enabled) {
+		goto end;
+	}
 
 	rcu_read_lock();
 
@@ -516,10 +562,10 @@ int agent_disable_event(struct agent_event *event,
 	}
 
 	event->enabled = 0;
-	ret = LTTNG_OK;
 
 error:
 	rcu_read_unlock();
+end:
 	return ret;
 }
 
@@ -672,14 +718,13 @@ void agent_add_app(struct agent_app *app)
 	assert(app);
 
 	DBG3("Agent adding app sock: %d and pid: %d to ht", app->sock->fd, app->pid);
-
-	rcu_read_lock();
 	lttng_ht_add_unique_ulong(agent_apps_ht_by_sock, &app->node);
-	rcu_read_unlock();
 }
 
 /*
  * Delete agent application from the global hash table.
+ *
+ * rcu_read_lock() must be held by the caller.
  */
 void agent_delete_app(struct agent_app *app)
 {
@@ -691,14 +736,12 @@ void agent_delete_app(struct agent_app *app)
 	DBG3("Agent deleting app pid: %d and sock: %d", app->pid, app->sock->fd);
 
 	iter.iter.node = &app->node.node;
-	rcu_read_lock();
 	ret = lttng_ht_del(agent_apps_ht_by_sock, &iter);
-	rcu_read_unlock();
 	assert(!ret);
 }
 
 /*
- * Destroy a agent application object by detaching it from its corresponding
+ * Destroy an agent application object by detaching it from its corresponding
  * UST app if one is connected by closing the socket. Finally, perform a
  * delayed memory reclaim.
  */
@@ -748,9 +791,7 @@ void agent_add(struct agent *agt, struct lttng_ht *ht)
 
 	DBG3("Agent adding from domain %d", agt->domain);
 
-	rcu_read_lock();
 	lttng_ht_add_unique_u64(ht, &agt->node);
-	rcu_read_unlock();
 }
 
 /*
@@ -763,7 +804,7 @@ struct agent *agent_create(enum lttng_domain_type domain)
 	int ret;
 	struct agent *agt;
 
-	agt = zmalloc(sizeof(*agt));
+	agt = zmalloc(sizeof(struct agent));
 	if (!agt) {
 		goto error;
 	}
@@ -781,33 +822,38 @@ error:
 }
 
 /*
- * Create a newly allocated agent event data structure. If name is valid, it's
- * copied into the created event.
+ * Create a newly allocated agent event data structure.
+ * Ownership of filter_expression is taken.
  *
  * Return a new object else NULL on error.
  */
 struct agent_event *agent_create_event(const char *name,
-		struct lttng_filter_bytecode *filter)
+		enum lttng_loglevel_type loglevel_type, int loglevel_value,
+		struct lttng_filter_bytecode *filter, char *filter_expression)
 {
-	struct agent_event *event;
+	struct agent_event *event = NULL;
 
-	DBG3("Agent create new event with name %s", name);
+	DBG3("Agent create new event with name %s, loglevel type %d and loglevel value %d",
+		name, loglevel_type, loglevel_value);
 
-	event = zmalloc(sizeof(*event));
-	if (!event) {
+	if (!name) {
+		ERR("Failed to create agent event; no name provided.");
 		goto error;
 	}
 
-	if (name) {
-		strncpy(event->name, name, sizeof(event->name));
-		event->name[sizeof(event->name) - 1] = '\0';
-		lttng_ht_node_init_str(&event->node, event->name);
+	event = zmalloc(sizeof(*event));
+	if (!event) {
+		goto error;
 	}
 
-	if (filter) {
-		event->filter = filter;
-	}
+	strncpy(event->name, name, sizeof(event->name));
+	event->name[sizeof(event->name) - 1] = '\0';
+	lttng_ht_node_init_str(&event->node, event->name);
 
+	event->loglevel_value = loglevel_value;
+	event->loglevel_type = loglevel_type;
+	event->filter = filter;
+	event->filter_expression = filter_expression;
 error:
 	return event;
 }
@@ -822,58 +868,64 @@ void agent_add_event(struct agent_event *event, struct agent *agt)
 	assert(agt->events);
 
 	DBG3("Agent adding event %s", event->name);
-
-	rcu_read_lock();
 	add_unique_agent_event(agt->events, event);
-	rcu_read_unlock();
 	agt->being_used = 1;
 }
 
 /*
- * Find a agent event in the given agent using name.
+ * Find multiple agent events sharing the given name.
  *
- * RCU read side lock MUST be acquired.
+ * RCU read side lock MUST be acquired. It must be held for the
+ * duration of the iteration.
  *
- * Return object if found else NULL.
+ * Sets the given iterator.
  */
-struct agent_event *agent_find_event_by_name(const char *name,
-		struct agent *agt)
+void agent_find_events_by_name(const char *name, struct agent *agt,
+		struct lttng_ht_iter* iter)
 {
-	struct lttng_ht_node_str *node;
-	struct lttng_ht_iter iter;
 	struct lttng_ht *ht;
 	struct agent_ht_key key;
 
 	assert(name);
 	assert(agt);
 	assert(agt->events);
+	assert(iter);
 
 	ht = agt->events;
 	key.name = name;
 
 	cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed),
-			ht_match_event_by_name, &key, &iter.iter);
-	node = lttng_ht_iter_get_node_str(&iter);
-	if (node == NULL) {
-		goto error;
-	}
+			ht_match_event_by_name, &key, &iter->iter);
+}
 
-	DBG3("Agent event found %s by name.", name);
-	return caa_container_of(node, struct agent_event, node);
+/*
+ * Get the next agent event duplicate by name. This should be called
+ * after a call to agent_find_events_by_name() to iterate on events.
+ *
+ * The RCU read lock must be held during the iteration and for as long
+ * as the object the iterator points to remains in use.
+ */
+void agent_event_next_duplicate(const char *name,
+		struct agent *agt, struct lttng_ht_iter* iter)
+{
+	struct agent_ht_key key;
 
-error:
-	DBG3("Agent NOT found by name %s.", name);
-	return NULL;
+	key.name = name;
+
+	cds_lfht_next_duplicate(agt->events->ht, ht_match_event_by_name,
+		&key, &iter->iter);
 }
 
 /*
  * Find a agent event in the given agent using name and loglevel.
  *
- * RCU read side lock MUST be acquired.
+ * RCU read side lock MUST be acquired. It must be kept for as long as
+ * the returned agent_event is used.
  *
  * Return object if found else NULL.
  */
-struct agent_event *agent_find_event(const char *name, int loglevel,
+struct agent_event *agent_find_event(const char *name,
+		enum lttng_loglevel_type loglevel_type, int loglevel_value,
 		struct agent *agt)
 {
 	struct lttng_ht_node_str *node;
@@ -887,7 +939,8 @@ struct agent_event *agent_find_event(const char *name, int loglevel,
 
 	ht = agt->events;
 	key.name = name;
-	key.loglevel = loglevel;
+	key.loglevel_value = loglevel_value;
+	key.loglevel_type = loglevel_type;
 
 	cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed),
 			ht_match_event, &key, &iter.iter);
@@ -900,7 +953,7 @@ struct agent_event *agent_find_event(const char *name, int loglevel,
 	return caa_container_of(node, struct agent_event, node);
 
 error:
-	DBG3("Agent NOT found %s.", name);
+	DBG3("Agent event NOT found %s.", name);
 	return NULL;
 }
 
@@ -914,12 +967,13 @@ void agent_destroy_event(struct agent_event *event)
 	assert(event);
 
 	free(event->filter);
+	free(event->filter_expression);
+	free(event->exclusion);
 	free(event);
 }
 
 /*
- * Destroy an agent completely. Note that the given pointer is NOT freed
- * thus a reference to static or stack data can be passed to this function.
+ * Destroy an agent completely.
  */
 void agent_destroy(struct agent *agt)
 {
@@ -930,14 +984,6 @@ void agent_destroy(struct agent *agt)
 
 	DBG3("Agent destroy");
 
-	/*
-	 * Just ignore if no events hash table exists. This is possible if for
-	 * instance an agent object was allocated but not initialized.
-	 */
-	if (!agt->events) {
-		return;
-	}
-
 	rcu_read_lock();
 	cds_lfht_for_each_entry(agt->events->ht, &iter.iter, node, node) {
 		int ret;
@@ -958,19 +1004,71 @@ void agent_destroy(struct agent *agt)
 	rcu_read_unlock();
 
 	ht_cleanup_push(agt->events);
+	free(agt);
 }
 
 /*
- * Initialize agent subsystem.
+ * Allocate agent_apps_ht_by_sock.
  */
-int agent_setup(void)
+int agent_app_ht_alloc(void)
 {
+	int ret = 0;
+
 	agent_apps_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
 	if (!agent_apps_ht_by_sock) {
-		return -1;
+		ret = -1;
 	}
 
-	return 0;
+	return ret;
+}
+
+/*
+ * Destroy a agent application by socket.
+ */
+void agent_destroy_app_by_sock(int sock)
+{
+	struct agent_app *app;
+
+	assert(sock >= 0);
+
+	/*
+	 * Not finding an application is a very important error that should NEVER
+	 * happen. The hash table deletion is ONLY done through this call when the
+	 * main sessiond thread is torn down.
+	 */
+	rcu_read_lock();
+	app = agent_find_app_by_sock(sock);
+	assert(app);
+
+	/* RCU read side lock is assumed to be held by this function. */
+	agent_delete_app(app);
+
+	/* The application is freed in a RCU call but the socket is closed here. */
+	agent_destroy_app(app);
+	rcu_read_unlock();
+}
+
+/*
+ * Clean-up the agent app hash table and destroy it.
+ */
+void agent_app_ht_clean(void)
+{
+	struct lttng_ht_node_ulong *node;
+	struct lttng_ht_iter iter;
+
+	if (!agent_apps_ht_by_sock) {
+		return;
+	}
+	rcu_read_lock();
+	cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, node, node) {
+		struct agent_app *app;
+
+		app = caa_container_of(node, struct agent_app, node);
+		agent_destroy_app_by_sock(app->sock->fd);
+	}
+	rcu_read_unlock();
+
+	lttng_ht_destroy(agent_apps_ht_by_sock);
 }
 
 /*