lttng: enable-channel: move kernel tracer status check to util

[lttng-tools.git] / src / bin / lttng / utils.cpp

diff --git a/src/bin/lttng/utils.cpp b/src/bin/lttng/utils.cpp
index df03b1127ed96be5b96614d57389d3c60dc719d8..e799e2f906e5e6fed14311dfc704b5472a9d775c 100644 (file)
--- a/src/bin/lttng/utils.cpp
+++ b/src/bin/lttng/utils.cpp
@@ -20,6 +20,7 @@
 #include <ctype.h>
 #include <fnmatch.h>
 #include <inttypes.h>
+#include <iostream>
 #include <limits.h>
 #include <netinet/in.h>
 #include <signal.h>
@@ -739,3 +740,54 @@ lttng::cli::session_list lttng::cli::list_sessions(const struct session_spec& sp
 
        return lttng::cli::session_list();
 }
+
+void print_kernel_tracer_status_error()
+{
+       if (lttng_opt_mi) {
+               return;
+       }
+
+       enum lttng_kernel_tracer_status kernel_tracer_status;
+       const auto ret = lttng_get_kernel_tracer_status(&kernel_tracer_status);
+
+       if (ret < 0) {
+               ERR("Failed to get kernel tracer status: %s", lttng_strerror(ret));
+       } else {
+               switch (kernel_tracer_status) {
+               case LTTNG_KERNEL_TRACER_STATUS_INITIALIZED:
+                       return;
+               case LTTNG_KERNEL_TRACER_STATUS_ERR_MODULES_UNKNOWN:
+                       std::cerr << "\tKernel module loading failed" << std::endl;
+                       break;
+               case LTTNG_KERNEL_TRACER_STATUS_ERR_MODULES_MISSING:
+                       std::cerr << "\tMissing one or more required kernel modules" << std::endl;
+                       break;
+               case LTTNG_KERNEL_TRACER_STATUS_ERR_MODULES_SIGNATURE:
+                       std::cerr
+                               << "\tKernel module signature error prevented loading of one or more required kernel modules"
+                               << std::endl;
+                       break;
+               case LTTNG_KERNEL_TRACER_STATUS_ERR_NEED_ROOT:
+                       std::cerr << "\tlttng-sessiond isn't running as root" << std::endl;
+                       break;
+               case LTTNG_KERNEL_TRACER_STATUS_ERR_NOTIFIER:
+                       std::cerr << "\tFailed to setup notifiers" << std::endl;
+                       break;
+               case LTTNG_KERNEL_TRACER_STATUS_ERR_OPEN_PROC_LTTNG:
+                       std::cerr << "\tlttng-sessiond failed to open /proc/lttng" << std::endl;
+                       break;
+               case LTTNG_KERNEL_TRACER_STATUS_ERR_VERSION_MISMATCH:
+                       std::cerr
+                               << "\tVersion mismatch between kernel tracer and kernel tracer ABI"
+                               << std::endl;
+                       break;
+               default:
+                       std::cerr << lttng::format("\t\tUnknown kernel tracer status (%d)",
+                                                  static_cast<int>(kernel_tracer_status))
+                                 << std::endl;
+                       break;
+               }
+
+               std::cerr << "\tConsult lttng-sessiond logs for more information" << std::endl;
+       }
+}