X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=ltt-sessiond%2Fkernel-ctl.c;h=1abd4cef1e6c242b3451ad940969d7fc964b53de;hp=969acfbf437deb51de608fcba7d991e9ba8353b6;hb=d686b40f66ea5df5ac0b9405991bbc33348b0a88;hpb=aaf267147df386f0438de88782296077ff5b5861

diff --git a/ltt-sessiond/kernel-ctl.c b/ltt-sessiond/kernel-ctl.c
index 969acfbf4..1abd4cef1 100644
--- a/ltt-sessiond/kernel-ctl.c
+++ b/ltt-sessiond/kernel-ctl.c
@@ -16,43 +16,48 @@
  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  */
 
+#define _GNU_SOURCE
 #include <errno.h>
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
+#include <unistd.h>
 
+#include "lttngerr.h"
 #include "ltt-sessiond.h"
 #include "libkernelctl.h"
 #include "kernel-ctl.h"
-#include "trace.h"
 
 /*
  *  kernel_create_session
  *
- *  Create a new kernel session using the command context session.
+ *  Create a new kernel session, register it to the kernel tracer and add it to
+ *  the session daemon session.
  */
-int kernel_create_session(struct command_ctx *cmd_ctx, int tracer_fd)
+int kernel_create_session(struct ltt_session *session, int tracer_fd)
 {
 	int ret;
 	struct ltt_kernel_session *lks;
 
-	/* Allocate a new kernel session */
-	lks = malloc(sizeof(struct ltt_kernel_session));
+	/* Allocate data structure */
+	lks = trace_create_kernel_session();
 	if (lks == NULL) {
-		perror("kernel session malloc");
-		ret = -errno;
+		ret = -1;
 		goto error;
 	}
 
+	/* Kernel tracer session creation */
 	ret = kernctl_create_session(tracer_fd);
 	if (ret < 0) {
+		perror("ioctl kernel create session");
 		goto error;
 	}
 
-	/* Assigning session fd and to the command context */
 	lks->fd = ret;
-	cmd_ctx->session->kernel_session = lks;
-	cmd_ctx->session->kern_session_count++;
+	session->kernel_session = lks;
+	session->kern_session_count++;
+
+	DBG("Kernel session created (fd: %d)", lks->fd);
 
 	return 0;
 
@@ -63,79 +68,126 @@ error:
 /*
  *  kernel_create_channel
  *
- *  Create a kernel channel within the kernel session.
+ *  Create a kernel channel, register it to the kernel tracer and add it to the
+ *  kernel session.
  */
-int kernel_create_channel(struct command_ctx *cmd_ctx)
+int kernel_create_channel(struct ltt_kernel_session *session)
 {
 	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");
-		ret = -errno;
+	/* Allocate kernel channel */
+	lkc = trace_create_kernel_channel();
+	if (lkc == NULL) {
 		goto error;
 	}
 
-	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;
-
-	ret = kernctl_create_channel(cmd_ctx->session->kernel_session->fd, chan);
+	/* Kernel tracer channel creation */
+	ret = kernctl_create_channel(session->fd, lkc->channel);
 	if (ret < 0) {
-		perror("ioctl create channel");
+		perror("ioctl kernel create channel");
 		goto error;
 	}
 
+	/* Setup the channel fd */
 	lkc->fd = ret;
-	lkc->channel = chan;
-	CDS_INIT_LIST_HEAD(&lkc->events_list.head);
+	/* Add channel to session */
+	cds_list_add(&lkc->list, &session->channel_list.head);
+	session->channel_count++;
 
-	cmd_ctx->session->kernel_session->channel = lkc;
+	DBG("Kernel channel created (fd: %d and path: %s)", lkc->fd, lkc->pathname);
 
 	return 0;
 
 error:
-	return ret;
+	return -1;
 }
 
 /*
  *  kernel_enable_event
  *
- *  Enable kernel event.
+ *  Create a kernel event, enable it to the kernel tracer and add it to the
+ *  channel event list of the kernel session.
  */
-int kernel_enable_event(struct ltt_kernel_channel *channel, char *name)
+int kernel_enable_event(struct ltt_kernel_session *session, char *name)
 {
 	int ret;
+	struct ltt_kernel_channel *chan;
 	struct ltt_kernel_event *event;
-	struct lttng_kernel_event *lke;
 
-	event = malloc(sizeof(struct ltt_kernel_event));
-	lke = malloc(sizeof(struct lttng_kernel_event));
+	event = trace_create_kernel_event(name, LTTNG_KERNEL_TRACEPOINTS);
+	if (event == NULL) {
+		goto error;
+	}
+
+	cds_list_for_each_entry(chan, &session->channel_list.head, list) {
+		ret = kernctl_create_event(chan->fd, event->event);
+		if (ret < 0) {
+			ERR("Unable to enable event %s", name);
+			goto error;
+		}
+
+		event->fd = ret;
+		/* Add event to event list */
+		cds_list_add(&event->list, &chan->events_list.head);
+		DBG("Event %s enabled (fd: %d)", name, event->fd);
+	}
+
+	return 0;
 
-	if (event == NULL || lke == NULL) {
-		perror("kernel enable event malloc");
-		ret = -errno;
+error:
+	return -1;
+}
+
+/*
+ *  kernel_open_metadata
+ *
+ *  Create kernel metadata, open from the kernel tracer and add it to the
+ *  kernel session.
+ */
+int kernel_open_metadata(struct ltt_kernel_session *session)
+{
+	int ret;
+	struct ltt_kernel_metadata *lkm;
+
+	/* Allocate kernel metadata */
+	lkm = trace_create_kernel_metadata();
+	if (lkm == NULL) {
 		goto error;
 	}
 
-	/* Setting up a kernel event */
-	strncpy(lke->name, name, LTTNG_SYM_NAME_LEN);
-	lke->instrumentation = LTTNG_KERNEL_TRACEPOINTS;
-	event->event = lke;
+	/* Kernel tracer metadata creation */
+	ret = kernctl_open_metadata(session->fd, lkm->conf);
+	if (ret < 0) {
+		goto error;
+	}
+
+	lkm->fd = ret;
+	session->metadata = lkm;
+
+	DBG("Kernel metadata opened (fd: %d and path: %s)", lkm->fd, lkm->pathname);
+
+	return 0;
+
+error:
+	return -1;
+}
+
+/*
+ *  kernel_start_session
+ *
+ *  Start tracing session.
+ */
+int kernel_start_session(struct ltt_kernel_session *session)
+{
+	int ret;
 
-	ret = kernctl_create_event(channel->fd, lke);
+	ret = kernctl_start_session(session->fd);
 	if (ret < 0) {
 		goto error;
 	}
 
-	/* Add event to event list */
-	cds_list_add(&event->list, &channel->events_list.head);
+	DBG("Kernel session started");
 
 	return 0;
 
@@ -144,42 +196,149 @@ error:
 }
 
 /*
- *  kernel_open_metadata
+ *  kernel_stop_session
  *
- *  Open metadata stream.
+ *  Stop tracing session.
  */
-int kernel_open_metadata(struct ltt_kernel_session *session)
+int kernel_stop_session(struct ltt_kernel_session *session)
 {
 	int ret;
-	struct ltt_kernel_metadata *lkm;
-	struct lttng_kernel_channel *conf;
-
-	lkm = malloc(sizeof(struct ltt_kernel_metadata));
-	conf = malloc(sizeof(struct lttng_kernel_channel));
 
-	if (lkm == NULL || conf == NULL) {
-		perror("kernel open metadata malloc");
-		ret = -errno;
+	ret = kernctl_stop_session(session->fd);
+	if (ret < 0) {
 		goto error;
 	}
 
-	conf->overwrite = DEFAULT_KERNEL_OVERWRITE;
-	conf->subbuf_size = DEFAULT_KERNEL_SUBBUF_SIZE;
-	conf->num_subbuf = DEFAULT_KERNEL_SUBBUF_NUM;
-	conf->switch_timer_interval = DEFAULT_KERNEL_SWITCH_TIMER;
-	conf->read_timer_interval = DEFAULT_KERNEL_READ_TIMER;
+	DBG("Kernel session stopped");
 
-	ret = kernctl_open_metadata(session->fd, conf);
+	return 0;
+
+error:
+	return ret;
+}
+
+/*
+ *  kernel_create_channel_stream
+ *
+ *  Create a stream for a channel, register it to the kernel tracer and add it
+ *  to the stream list of the channel.
+ *
+ *  Return the number of created stream. Else, a negative value.
+ */
+int kernel_create_channel_stream(struct ltt_kernel_channel *channel)
+{
+	int ret;
+	struct ltt_kernel_stream *lks;
+
+	while ((ret = kernctl_create_stream(channel->fd)) > 0) {
+		lks = trace_create_kernel_stream();
+		if (lks == NULL) {
+			close(ret);
+			goto error;
+		}
+
+		lks->fd = ret;
+		ret = asprintf(&lks->pathname, "%s/trace_%d",
+				channel->pathname, channel->stream_count);
+		if (ret < 0) {
+			perror("asprintf kernel create stream");
+			goto error;
+		}
+
+		/* Add stream to channe stream list */
+		cds_list_add(&lks->list, &channel->stream_list.head);
+		channel->stream_count++;
+
+		DBG("Kernel stream %d created (fd: %d, state: %d, path: %s)",
+				channel->stream_count, lks->fd, lks->state, lks->pathname);
+	}
+
+	return channel->stream_count;
+
+error:
+	return -1;
+}
+
+/*
+ *  kernel_create_metadata_stream
+ *
+ *  Create the metadata stream and set it to the kernel session.
+ */
+int kernel_create_metadata_stream(struct ltt_kernel_session *session)
+{
+	int ret;
+
+	ret = kernctl_create_stream(session->metadata->fd);
 	if (ret < 0) {
+		perror("kernel create metadata stream");
 		goto error;
 	}
 
-	session->metadata = lkm;
-	session->metadata->fd = ret;
-	session->metadata->conf = conf;
+	DBG("Kernel metadata stream created (fd: %d)", ret);
+	session->metadata_stream_fd = ret;
 
 	return 0;
 
 error:
-	return ret;
+	return -1;
+}
+
+/*
+ *  kernel_list_events
+ *
+ *  Get the event list from the kernel tracer and return that list in the CTF
+ *  format.
+ */
+ssize_t kernel_list_events(int tracer_fd, char **list)
+{
+	int fd;
+	char *buf, *line = NULL;
+	size_t nb, nbmem, total = 0;
+	ssize_t size;
+	FILE *fp;
+
+	fd = kernctl_tracepoint_list(tracer_fd);
+	if (fd < 0) {
+		perror("kernel tracepoint list");
+		goto error;
+	}
+
+	fp = fdopen(fd, "r");
+	if (fp == NULL) {
+		perror("kernel tracepoint list fdopen");
+		goto error;
+	}
+
+	/*
+	 * Init memory size counter
+	 * See kernel-ctl.h for explanation of this value
+	 */
+	nbmem = KERNEL_EVENT_LIST_SIZE;
+	buf = malloc(nbmem);
+
+	while ((size = getline(&line, &nb, fp)) != -1) {
+		if (total + size > nbmem) {
+			DBG("Reallocating event list from %zd to %zd bytes", nbmem,
+					total + size + KERNEL_EVENT_LIST_SIZE);
+			/* Adding the default size again */
+			nbmem = total + size + KERNEL_EVENT_LIST_SIZE;
+			buf = realloc(buf, nbmem);
+			if (buf == NULL) {
+				perror("realloc list events");
+				goto error;
+			}
+		}
+		memcpy(buf + total, line, size);
+		total += size;
+	}
+
+	*list = buf;
+
+	DBG("Kernel list events done");
+
+	return total;
+
+error:
+	return -1;
 }
+