Add enable kernel channel support

[lttng-tools.git] / ltt-sessiond / main.c

diff --git a/ltt-sessiond/main.c b/ltt-sessiond/main.c
index d9f7667b1df95497e8e76420cc35ab5f5bfb69ec..4fba6a2cf53a701054601e88df4478f35b658342 100644 (file)
--- a/ltt-sessiond/main.c
+++ b/ltt-sessiond/main.c
@@ -941,6 +941,35 @@ static int process_client_msg(struct command_ctx *cmd_ctx)
                ret = LTTCOMM_OK;
                break;
        }
+       case LTTNG_KERNEL_ENABLE_CHANNEL:
+       {
+               struct ltt_kernel_channel *chan;
+
+               /* Setup lttng message with no payload */
+               ret = setup_lttng_msg(cmd_ctx, 0);
+               if (ret < 0) {
+                       goto setup_error;
+               }
+
+               chan = get_kernel_channel_by_name(cmd_ctx->lsm->u.enable.channel_name,
+                               cmd_ctx->session->kernel_session);
+               if (chan == NULL) {
+                       ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
+                       goto error;
+               } else if (chan->enabled == 0) {
+                       ret = kernel_enable_channel(chan);
+                       if (ret < 0) {
+                               if (ret != EEXIST) {
+                                       ret = LTTCOMM_KERN_CHAN_ENABLE_FAIL;
+                               }
+                               goto error;
+                       }
+               }
+
+               kernel_wait_quiescent(kernel_tracer_fd);
+               ret = LTTCOMM_OK;
+               break;
+       }
        case LTTNG_KERNEL_ENABLE_EVENT:
        {
                struct ltt_kernel_channel *chan;