* 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;
/*
* 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));
+ /* Allocate kernel channel */
+ lkc = trace_create_kernel_channel();
+ if (lkc == NULL) {
+ goto error;
+ }
+
+ /* Kernel tracer channel creation */
+ ret = kernctl_create_channel(session->fd, lkc->channel);
+ if (ret < 0) {
+ perror("ioctl kernel create channel");
+ goto error;
+ }
+
+ /* Setup the channel fd */
+ lkc->fd = ret;
+ /* Add channel to session */
+ cds_list_add(&lkc->list, &session->channel_list.head);
+ session->channel_count++;
+
+ DBG("Kernel channel created (fd: %d and path: %s)", lkc->fd, lkc->pathname);
+
+ return 0;
+
+error:
+ return -1;
+}
+
+/*
+ * kernel_enable_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_session *session, char *name)
+{
+ int ret;
+ struct ltt_kernel_channel *chan;
+ struct ltt_kernel_event *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;
+
+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;
+ }
- if (lkc == NULL || chan == NULL) {
- perror("kernel channel malloc");
- ret = -errno;
+ /* Kernel tracer metadata creation */
+ ret = kernctl_open_metadata(session->fd, lkm->conf);
+ if (ret < 0) {
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;
+ lkm->fd = ret;
+ session->metadata = lkm;
+
+ DBG("Kernel metadata opened (fd: %d and path: %s)", lkm->fd, lkm->pathname);
- ret = kernctl_create_channel(cmd_ctx->session->kernel_session->fd, chan);
+ return 0;
+
+error:
+ return -1;
+}
+
+/*
+ * kernel_start_session
+ *
+ * Start tracing session.
+ */
+int kernel_start_session(struct ltt_kernel_session *session)
+{
+ int ret;
+
+ ret = kernctl_start_session(session->fd);
if (ret < 0) {
goto error;
}
- lkc->fd = ret;
- lkc->channel = chan;
- CDS_INIT_LIST_HEAD(&lkc->events_list.head);
+ DBG("Kernel session started");
+
+ return 0;
+
+error:
+ return ret;
+}
+
+/*
+ * kernel_stop_session
+ *
+ * Stop tracing session.
+ */
+int kernel_stop_session(struct ltt_kernel_session *session)
+{
+ int ret;
+
+ ret = kernctl_stop_session(session->fd);
+ if (ret < 0) {
+ goto error;
+ }
- cmd_ctx->session->kernel_session->channel = lkc;
+ DBG("Kernel session stopped");
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;
+ }
+
+ DBG("Kernel metadata stream created (fd: %d)", ret);
+ session->metadata_stream_fd = ret;
+
+ return 0;
+
+error:
+ 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;
+}
+
projects / lttng-tools.git / blobdiff