X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=ltt-sessiond%2Ftrace.c;h=e0aeac685e28a312b71fc773fa4ab05ca3eccb89;hp=8b1d15e105b730501bd149cd67088e8d12800356;hb=e6ddca715d6dedb6ee25fe4392a6e1f9626b2544;hpb=540126381ff8f3b1e2b3357329fe105fc0bb5e4c

diff --git a/ltt-sessiond/trace.c b/ltt-sessiond/trace.c
index 8b1d15e10..e0aeac685 100644
--- a/ltt-sessiond/trace.c
+++ b/ltt-sessiond/trace.c
@@ -20,11 +20,65 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <unistd.h>
 #include <urcu/list.h>
 
-#include "ltt-sessiond.h"
+#include "lttngerr.h"
 #include "trace.h"
 
+/*
+ *  get_kernel_channel_by_name
+ *
+ *  Find the channel name for the given kernel session.
+ */
+struct ltt_kernel_channel *get_kernel_channel_by_name(
+		char *name, struct ltt_kernel_session *session)
+{
+	struct ltt_kernel_channel *chan;
+
+	if (session == NULL) {
+		ERR("Undefine session");
+		goto error;
+	}
+
+	cds_list_for_each_entry(chan, &session->channel_list.head, list) {
+		if (strcmp(name, chan->channel->name) == 0) {
+			DBG("Found channel by name %s", name);
+			return chan;
+		}
+	}
+
+error:
+	return NULL;
+}
+
+/*
+ *  get_kernel_event_by_name
+ *
+ *  Find the event name for the given channel.
+ */
+struct ltt_kernel_event *get_kernel_event_by_name(
+		char *name, struct ltt_kernel_channel *channel)
+{
+	struct ltt_kernel_event *ev;
+
+	if (channel == NULL) {
+		ERR("Undefine channel");
+		goto error;
+	}
+
+	cds_list_for_each_entry(ev, &channel->events_list.head, list) {
+		if (strcmp(name, ev->event->name) == 0) {
+			DBG("Found event by name %s for channel %s", name,
+					channel->channel->name);
+			return ev;
+		}
+	}
+
+error:
+	return NULL;
+}
+
 /*
  *  trace_create_kernel_session
  *
@@ -64,34 +118,32 @@ error:
  *
  *  Return pointer to structure or NULL.
  */
-struct ltt_kernel_channel *trace_create_kernel_channel(void)
+struct ltt_kernel_channel *trace_create_kernel_channel(struct lttng_channel *chan, char *path)
 {
 	int ret;
 	struct ltt_kernel_channel *lkc;
-	struct lttng_kernel_channel *chan;
 
 	lkc = malloc(sizeof(struct ltt_kernel_channel));
-	chan = malloc(sizeof(struct lttng_kernel_channel));
-	if (lkc == NULL || chan == NULL) {
-		perror("kernel channel malloc");
+	if (lkc == NULL) {
+		perror("ltt_kernel_channel malloc");
 		goto error;
 	}
 
-	/* Default value to channel */
-	chan->overwrite = DEFAULT_KERNEL_OVERWRITE;
-	chan->subbuf_size = DEFAULT_KERNEL_SUBBUF_SIZE;
-	chan->num_subbuf = DEFAULT_KERNEL_SUBBUF_NUM;
-	chan->switch_timer_interval = DEFAULT_KERNEL_SWITCH_TIMER;
-	chan->read_timer_interval = DEFAULT_KERNEL_READ_TIMER;
+	lkc->channel = malloc(sizeof(struct lttng_channel));
+	if (lkc->channel == NULL) {
+		perror("lttng_channel malloc");
+		goto error;
+	}
+	memcpy(lkc->channel, chan, sizeof(struct lttng_channel));
 
 	lkc->fd = 0;
 	lkc->stream_count = 0;
-	lkc->channel = chan;
+	lkc->enabled = 1;
 	/* Init linked list */
 	CDS_INIT_LIST_HEAD(&lkc->events_list.head);
 	CDS_INIT_LIST_HEAD(&lkc->stream_list.head);
 	/* Set default trace output path */
-	ret = asprintf(&lkc->pathname, "%s", DEFAULT_TRACE_OUTPUT);
+	ret = asprintf(&lkc->pathname, "%s", path);
 	if (ret < 0) {
 		perror("asprintf kernel create channel");
 		goto error;
@@ -110,8 +162,7 @@ error:
  *
  *  Return pointer to structure or NULL.
  */
-struct ltt_kernel_event *trace_create_kernel_event(char *name,
-		enum lttng_kernel_instrumentation type)
+struct ltt_kernel_event *trace_create_kernel_event(struct lttng_event *ev)
 {
 	struct ltt_kernel_event *lke;
 	struct lttng_kernel_event *attr;
@@ -123,12 +174,34 @@ struct ltt_kernel_event *trace_create_kernel_event(char *name,
 		goto error;
 	}
 
-	/* Init event attribute */
-	attr->instrumentation = type;
-	strncpy(attr->name, name, LTTNG_SYM_NAME_LEN);
+	switch (ev->type) {
+	case LTTNG_EVENT_KPROBE:
+		attr->instrumentation = LTTNG_KERNEL_KPROBE;
+		attr->u.kprobe.addr = ev->attr.kprobe.addr;
+		attr->u.kprobe.offset = ev->attr.kprobe.offset;
+		strncpy(attr->u.kprobe.symbol_name,
+				ev->attr.kprobe.symbol_name, LTTNG_SYM_NAME_LEN);
+		break;
+	case LTTNG_EVENT_FUNCTION:
+		attr->instrumentation = LTTNG_KERNEL_FUNCTION;
+		strncpy(attr->u.ftrace.symbol_name,
+				ev->attr.ftrace.symbol_name, LTTNG_SYM_NAME_LEN);
+		break;
+	case LTTNG_EVENT_TRACEPOINT:
+		attr->instrumentation = LTTNG_KERNEL_TRACEPOINT;
+		break;
+	default:
+		ERR("Unknown kernel instrumentation type (%d)", ev->type);
+		goto error;
+	}
+
+	/* Copy event name */
+	strncpy(attr->name, ev->name, LTTNG_SYM_NAME_LEN);
+
 	/* Setting up a kernel event */
 	lke->fd = 0;
 	lke->event = attr;
+	lke->enabled = 1;
 
 	return lke;
 
@@ -143,31 +216,32 @@ error:
  *
  *  Return pointer to structure or NULL.
  */
-struct ltt_kernel_metadata *trace_create_kernel_metadata(void)
+struct ltt_kernel_metadata *trace_create_kernel_metadata(char *path)
 {
 	int ret;
 	struct ltt_kernel_metadata *lkm;
-	struct lttng_kernel_channel *attr;
+	struct lttng_channel *chan;
 
 	lkm = malloc(sizeof(struct ltt_kernel_metadata));
-	attr = malloc(sizeof(struct lttng_kernel_channel));
-	if (lkm == NULL || attr == NULL) {
+	chan = malloc(sizeof(struct lttng_channel));
+	if (lkm == NULL || chan == NULL) {
 		perror("kernel metadata malloc");
 		goto error;
 	}
 
 	/* Set default attributes */
-	attr->overwrite = DEFAULT_KERNEL_OVERWRITE;
-	attr->subbuf_size = DEFAULT_KERNEL_SUBBUF_SIZE;
-	attr->num_subbuf = DEFAULT_KERNEL_SUBBUF_NUM;
-	attr->switch_timer_interval = DEFAULT_KERNEL_SWITCH_TIMER;
-	attr->read_timer_interval = DEFAULT_KERNEL_READ_TIMER;
+	chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
+	chan->attr.subbuf_size = DEFAULT_CHANNEL_SUBBUF_SIZE;
+	chan->attr.num_subbuf = DEFAULT_CHANNEL_SUBBUF_NUM;
+	chan->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER;
+	chan->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER;
+	chan->attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
 
 	/* Init metadata */
 	lkm->fd = 0;
-	lkm->conf = attr;
+	lkm->conf = chan;
 	/* Set default metadata path */
-	ret = asprintf(&lkm->pathname, "%s/metadata", DEFAULT_TRACE_OUTPUT);
+	ret = asprintf(&lkm->pathname, "%s/metadata", path);
 	if (ret < 0) {
 		perror("asprintf kernel metadata");
 		goto error;
@@ -207,3 +281,89 @@ struct ltt_kernel_stream *trace_create_kernel_stream(void)
 error:
 	return NULL;
 }
+
+void trace_destroy_kernel_stream(struct ltt_kernel_stream *stream)
+{
+	DBG("[trace] Closing stream fd %d", stream->fd);
+	/* Close kernel fd */
+	close(stream->fd);
+	free(stream->pathname);
+
+	/* Remove from stream list */
+	cds_list_del(&stream->list);
+	free(stream);
+}
+
+void trace_destroy_kernel_event(struct ltt_kernel_event *event)
+{
+	DBG("[trace] Closing event fd %d", event->fd);
+	/* Close kernel fd */
+	close(event->fd);
+	/* Free attributes */
+	free(event->event);
+
+	/* Remove from event list */
+	cds_list_del(&event->list);
+	free(event);
+}
+
+void trace_destroy_kernel_channel(struct ltt_kernel_channel *channel)
+{
+	struct ltt_kernel_stream *stream;
+	struct ltt_kernel_event *event;
+
+	DBG("[trace] Closing channel fd %d", channel->fd);
+	/* Close kernel fd */
+	close(channel->fd);
+	free(channel->pathname);
+	/* Free attributes structure */
+	free(channel->channel);
+
+	/* For each stream in the channel list */
+	cds_list_for_each_entry(stream, &channel->stream_list.head, list) {
+		trace_destroy_kernel_stream(stream);
+	}
+
+	/* For each event in the channel list */
+	cds_list_for_each_entry(event, &channel->events_list.head, list) {
+		trace_destroy_kernel_event(event);
+	}
+
+	/* Remove from channel list */
+	cds_list_del(&channel->list);
+	free(channel);
+}
+
+void trace_destroy_kernel_metadata(struct ltt_kernel_metadata *metadata)
+{
+	DBG("[trace] Closing metadata fd %d", metadata->fd);
+	/* Close kernel fd */
+	close(metadata->fd);
+	/* Free attributes */
+	free(metadata->conf);
+
+	free(metadata);
+}
+
+void trace_destroy_kernel_session(struct ltt_kernel_session *session)
+{
+	struct ltt_kernel_channel *channel;
+
+	DBG("[trace] Closing session fd %d", session->fd);
+	/* Close kernel fds */
+	close(session->fd);
+	if (session->metadata_stream_fd != 0) {
+		DBG("[trace] Closing metadata stream fd %d", session->metadata_stream_fd);
+		close(session->metadata_stream_fd);
+	}
+
+	if (session->metadata != NULL) {
+		trace_destroy_kernel_metadata(session->metadata);
+	}
+
+	cds_list_for_each_entry(channel, &session->channel_list.head, list) {
+		trace_destroy_kernel_channel(channel);
+	}
+
+	free(session);
+}