Implement consumer ring buffer position sampling
[lttng-tools.git] / src / bin / lttng-sessiond / trace-kernel.c
index 29432de49a0355b16863ab69189929a6c37719f3..d6ee8e8afb23401b2420e430bdd892dd0acc714d 100644 (file)
@@ -26,6 +26,8 @@
 
 #include "consumer.h"
 #include "trace-kernel.h"
+#include "lttng-sessiond.h"
+#include "notification-thread-commands.h"
 
 /*
  * Find the channel name for the given kernel session.
@@ -179,6 +181,7 @@ struct ltt_kernel_channel *trace_kernel_create_channel(
                struct lttng_channel *chan)
 {
        struct ltt_kernel_channel *lkc;
+       struct lttng_channel_extended *extended;
 
        assert(chan);
 
@@ -191,10 +194,18 @@ struct ltt_kernel_channel *trace_kernel_create_channel(
        lkc->channel = zmalloc(sizeof(struct lttng_channel));
        if (lkc->channel == NULL) {
                PERROR("lttng_channel zmalloc");
-               free(lkc);
+               goto error;
+       }
+
+       extended = zmalloc(sizeof(struct lttng_channel_extended));
+       if (!extended) {
+               PERROR("lttng_channel_channel zmalloc");
                goto error;
        }
        memcpy(lkc->channel, chan, sizeof(struct lttng_channel));
+       memcpy(extended, chan->attr.extended.ptr, sizeof(struct lttng_channel_extended));
+       lkc->channel->attr.extended.ptr = extended;
+       extended = NULL;
 
        /*
         * If we receive an empty string for channel name, it means the
@@ -218,6 +229,11 @@ struct ltt_kernel_channel *trace_kernel_create_channel(
        return lkc;
 
 error:
+       if (lkc) {
+               free(lkc->channel);
+       }
+       free(extended);
+       free(lkc);
        return NULL;
 }
 
@@ -475,6 +491,7 @@ void trace_kernel_destroy_channel(struct ltt_kernel_channel *channel)
        struct ltt_kernel_event *event, *etmp;
        struct ltt_kernel_context *ctx, *ctmp;
        int ret;
+       enum lttng_error_code status;
 
        assert(channel);
 
@@ -505,6 +522,11 @@ void trace_kernel_destroy_channel(struct ltt_kernel_channel *channel)
        /* Remove from channel list */
        cds_list_del(&channel->list);
 
+       status = notification_thread_command_remove_channel(
+                       notification_thread_handle,
+                       channel->fd, LTTNG_DOMAIN_KERNEL);
+       assert(status == LTTNG_OK);
+       free(channel->channel->attr.extended.ptr);
        free(channel->channel);
        free(channel);
 }
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