X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fbin%2Flttng%2Futils.cpp;h=9a9f39bf2529b1cd6328f5052b73672715d12663;hp=5b0c461d98a2d8f58627e76e3c6695914f606194;hb=HEAD;hpb=ca938aa52e0d841fc638ecffb4261a80d846831f

diff --git a/src/bin/lttng/utils.cpp b/src/bin/lttng/utils.cpp
index 5b0c461d9..45fe256a5 100644
--- a/src/bin/lttng/utils.cpp
+++ b/src/bin/lttng/utils.cpp
@@ -8,6 +8,7 @@
 #define _LGPL_SOURCE
 #include "command.hpp"
 #include "conf.hpp"
+#include "exception.hpp"
 #include "utils.hpp"
 
 #include <common/defaults.hpp>
@@ -20,6 +21,7 @@
 #include <ctype.h>
 #include <fnmatch.h>
 #include <inttypes.h>
+#include <iostream>
 #include <limits.h>
 #include <netinet/in.h>
 #include <signal.h>
@@ -665,11 +667,10 @@ end:
 
 namespace {
 template <typename FilterFunctionType>
-session_list get_sessions(const FilterFunctionType& filter, bool return_first_match_only = false)
+lttng::cli::session_list get_sessions(const FilterFunctionType& filter,
+				      bool return_first_match_only = false)
 {
-	session_list list;
-
-	{
+	lttng::cli::session_list list = []() {
 		int list_ret;
 		struct lttng_session *psessions;
 
@@ -680,8 +681,8 @@ session_list get_sessions(const FilterFunctionType& filter, bool return_first_ma
 					static_cast<lttng_error_code>(list_ret));
 		}
 
-		list = session_list(psessions, list_ret);
-	}
+		return lttng::cli::session_list(psessions, list_ret);
+	}();
 
 	std::size_t write_to = 0;
 	for (std::size_t read_from = 0; read_from < list.size(); ++read_from) {
@@ -696,7 +697,7 @@ session_list get_sessions(const FilterFunctionType& filter, bool return_first_ma
 		++write_to;
 
 		if (return_first_match_only) {
-			return session_list(std::move(list), 1);
+			return lttng::cli::session_list(std::move(list), 1);
 		}
 	}
 
@@ -706,23 +707,23 @@ session_list get_sessions(const FilterFunctionType& filter, bool return_first_ma
 }
 } /* namespace */
 
-session_list list_sessions(const struct session_spec& spec)
+lttng::cli::session_list lttng::cli::list_sessions(const struct session_spec& spec)
 {
-	switch (spec.type) {
-	case session_spec::NAME:
+	switch (spec.type_) {
+	case lttng::cli::session_spec::type::NAME:
 		if (spec.value == nullptr) {
 			const auto configured_name =
-				lttng::make_unique_wrapper<char, lttng::free>(get_session_name());
-
-			if (configured_name) {
-				const struct session_spec new_spec = {
-					.type = session_spec::NAME, .value = configured_name.get()
-				};
+				lttng::make_unique_wrapper<char, lttng::memory::free>(
+					get_session_name());
 
-				return list_sessions(new_spec);
+			if (!configured_name) {
+				LTTNG_THROW_CLI_NO_DEFAULT_SESSION();
 			}
 
-			return session_list();
+			const struct lttng::cli::session_spec new_spec(
+				lttng::cli::session_spec::type::NAME, configured_name.get());
+
+			return list_sessions(new_spec);
 		}
 
 		return get_sessions(
@@ -730,13 +731,63 @@ session_list list_sessions(const struct session_spec& spec)
 				return strcmp(session.name, spec.value) == 0;
 			},
 			true);
-	case session_spec::GLOB_PATTERN:
+	case lttng::cli::session_spec::type::GLOB_PATTERN:
 		return get_sessions([&spec](const lttng_session& session) {
 			return fnmatch(spec.value, session.name, 0) == 0;
 		});
-	case session_spec::ALL:
+	case lttng::cli::session_spec::type::ALL:
 		return get_sessions([](const lttng_session&) { return true; });
 	}
 
-	return session_list();
+	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;
+	}
 }