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[lttng-tools.git] / ltt-sessiond / kernel-ctl.c

diff --git a/ltt-sessiond/kernel-ctl.c b/ltt-sessiond/kernel-ctl.c
index 5d70296ea82008669c6710c57a19024c4620f051..969acfbf437deb51de608fcba7d991e9ba8353b6 100644 (file)
--- a/ltt-sessiond/kernel-ctl.c
+++ b/ltt-sessiond/kernel-ctl.c
@@ -19,6 +19,7 @@
 #include <errno.h>
 #include <stdlib.h>
 #include <stdio.h>
+#include <string.h>
 
 #include "ltt-sessiond.h"
 #include "libkernelctl.h"
@@ -87,6 +88,7 @@ int kernel_create_channel(struct command_ctx *cmd_ctx)
 
        ret = kernctl_create_channel(cmd_ctx->session->kernel_session->fd, chan);
        if (ret < 0) {
+               perror("ioctl create channel");
                goto error;
        }
 
@@ -101,3 +103,83 @@ int kernel_create_channel(struct command_ctx *cmd_ctx)
 error:
        return ret;
 }
+
+/*
+ *  kernel_enable_event
+ *
+ *  Enable kernel event.
+ */
+int kernel_enable_event(struct ltt_kernel_channel *channel, char *name)
+{
+       int ret;
+       struct ltt_kernel_event *event;
+       struct lttng_kernel_event *lke;
+
+       event = malloc(sizeof(struct ltt_kernel_event));
+       lke = malloc(sizeof(struct lttng_kernel_event));
+
+       if (event == NULL || lke == NULL) {
+               perror("kernel enable event malloc");
+               ret = -errno;
+               goto error;
+       }
+
+       /* Setting up a kernel event */
+       strncpy(lke->name, name, LTTNG_SYM_NAME_LEN);
+       lke->instrumentation = LTTNG_KERNEL_TRACEPOINTS;
+       event->event = lke;
+
+       ret = kernctl_create_event(channel->fd, lke);
+       if (ret < 0) {
+               goto error;
+       }
+
+       /* Add event to event list */
+       cds_list_add(&event->list, &channel->events_list.head);
+
+       return 0;
+
+error:
+       return ret;
+}
+
+/*
+ *  kernel_open_metadata
+ *
+ *  Open metadata stream.
+ */
+int kernel_open_metadata(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;
+               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;
+
+       ret = kernctl_open_metadata(session->fd, conf);
+       if (ret < 0) {
+               goto error;
+       }
+
+       session->metadata = lkm;
+       session->metadata->fd = ret;
+       session->metadata->conf = conf;
+
+       return 0;
+
+error:
+       return ret;
+}