Rotate timer

[lttng-tools.git] / src / bin / lttng-sessiond / main.c

diff --git a/src/bin/lttng-sessiond/main.c b/src/bin/lttng-sessiond/main.c
index 489cc9d7646e5643634e04d27e71057beceee930..5e4148fb6e707fc653dfa3cea4f0c883c8bd0f7f 100644 (file)
--- a/src/bin/lttng-sessiond/main.c
+++ b/src/bin/lttng-sessiond/main.c
@@ -2903,6 +2903,22 @@ static unsigned int lttng_sessions_count(uid_t uid, gid_t gid)
        return i;
 }
 
+/*
+ * Check if the current kernel tracer supports the session rotation feature.
+ * Return 1 if it does, 0 otherwise.
+ */
+static int check_rotate_compatible(void)
+{
+       int ret = 1;
+
+       if (kernel_tracer_version.major != 2 || kernel_tracer_version.minor < 11) {
+               DBG("Kernel tracer version is not compatible with the rotation feature");
+               ret = 0;
+       }
+
+       return ret;
+}
+
 /*
  * Process the command requested by the lttng client within the command
  * context structure. This function make sure that the return structure (llm)
@@ -2947,6 +2963,10 @@ static int process_client_msg(struct command_ctx *cmd_ctx, int sock,
        case LTTNG_REGENERATE_STATEDUMP:
        case LTTNG_REGISTER_TRIGGER:
        case LTTNG_UNREGISTER_TRIGGER:
+       case LTTNG_ROTATE_SESSION:
+       case LTTNG_ROTATION_GET_INFO:
+       case LTTNG_SESSION_GET_CURRENT_OUTPUT:
+       case LTTNG_ROTATION_SET_SCHEDULE:
                need_domain = 0;
                break;
        default:
@@ -2989,6 +3009,8 @@ static int process_client_msg(struct command_ctx *cmd_ctx, int sock,
        case LTTNG_LIST_SYSCALLS:
        case LTTNG_LIST_TRACKER_PIDS:
        case LTTNG_DATA_PENDING:
+       case LTTNG_ROTATE_SESSION:
+       case LTTNG_ROTATION_GET_INFO:
                break;
        default:
                /* Setup lttng message with no payload */
@@ -3680,6 +3702,20 @@ error_add_context:
        }
        case LTTNG_START_TRACE:
        {
+               /*
+                * On the first start, if we have a kernel session and we have
+                * enabled time or size-based rotations, we have to make sure
+                * the kernel tracer supports it.
+                */
+               if (!cmd_ctx->session->has_been_started && \
+                               cmd_ctx->session->kernel_session && \
+                               (cmd_ctx->session->rotate_timer_period || \
+                                       cmd_ctx->session->rotate_size) && \
+                               !check_rotate_compatible()) {
+                       DBG("Kernel tracer version is not compatible with the rotation feature");
+                       ret = LTTNG_ERR_ROTATION_WRONG_VERSION;
+                       goto error;
+               }
                ret = cmd_start_trace(cmd_ctx->session);
                break;
        }
@@ -4077,6 +4113,98 @@ error_add_context:
                                notification_thread_handle);
                break;
        }
+       case LTTNG_ROTATE_SESSION:
+       {
+               struct lttng_rotate_session_return rotate_return;
+
+               DBG("Client rotate session \"%s\"", cmd_ctx->session->name);
+
+               memset(&rotate_return, 0, sizeof(rotate_return));
+               if (cmd_ctx->session->kernel_session && !check_rotate_compatible()) {
+                       DBG("Kernel tracer version is not compatible with the rotation feature");
+                       ret = LTTNG_ERR_ROTATION_WRONG_VERSION;
+                       goto error;
+               }
+
+               ret = cmd_rotate_session(cmd_ctx->session, &rotate_return);
+               if (ret < 0) {
+                       ret = -ret;
+                       goto error;
+               }
+
+               ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &rotate_return,
+                               sizeof(rotate_return));
+               if (ret < 0) {
+                       ret = -ret;
+                       goto error;
+               }
+
+               ret = LTTNG_OK;
+               break;
+       }
+       case LTTNG_ROTATION_GET_INFO:
+       {
+               struct lttng_rotation_get_info_return get_info_return;
+
+               memset(&get_info_return, 0, sizeof(get_info_return));
+               ret = cmd_rotate_get_info(cmd_ctx->session, &get_info_return,
+                               cmd_ctx->lsm->u.get_rotation_info.rotation_id);
+               if (ret < 0) {
+                       ret = -ret;
+                       goto error;
+               }
+
+               ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &get_info_return,
+                               sizeof(get_info_return));
+               if (ret < 0) {
+                       ret = -ret;
+                       goto error;
+               }
+
+               ret = LTTNG_OK;
+               break;
+       }
+       case LTTNG_SESSION_GET_CURRENT_OUTPUT:
+       {
+               struct lttng_session_get_current_output_return output_return;
+
+               memset(&output_return, 0, sizeof(output_return));
+               ret = cmd_session_get_current_output(cmd_ctx->session,
+                               &output_return);
+               if (ret < 0) {
+                       ret = -ret;
+                       goto error;
+               }
+
+               ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &output_return,
+                               sizeof(output_return));
+               if (ret < 0) {
+                       ret = -ret;
+                       goto error;
+               }
+
+               ret = LTTNG_OK;
+               break;
+       }
+       case LTTNG_ROTATION_SET_SCHEDULE:
+       {
+               if (cmd_ctx->session->kernel_session && !check_rotate_compatible()) {
+                       DBG("Kernel tracer version does not support session rotations");
+                       ret = LTTNG_ERR_ROTATION_WRONG_VERSION;
+                       goto error;
+               }
+
+               ret = cmd_rotation_set_schedule(cmd_ctx->session,
+                               cmd_ctx->lsm->u.rotate_setup.timer_us,
+                               cmd_ctx->lsm->u.rotate_setup.size);
+               if (ret < 0) {
+                       ret = -ret;
+                       goto error;
+               }
+
+               ret = LTTNG_OK;
+               break;
+       }
        default:
                ret = LTTNG_ERR_UND;
                break;