Clean-up: modernize pretty_xml.cpp

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

diff --git a/src/bin/lttng/utils.cpp b/src/bin/lttng/utils.cpp
index 90ca90fdeb3a4892424e62827d01e920d7951ef5..45fe256a579d092b4a1d92ddd81e26459b315a1e 100644 (file)
--- a/src/bin/lttng/utils.cpp
+++ b/src/bin/lttng/utils.cpp
@@ -8,15 +8,20 @@
 #define _LGPL_SOURCE
 #include "command.hpp"
 #include "conf.hpp"
+#include "exception.hpp"
 #include "utils.hpp"
 
 #include <common/defaults.hpp>
 #include <common/error.hpp>
+#include <common/exception.hpp>
+#include <common/make-unique-wrapper.hpp>
 #include <common/utils.hpp>
 
 #include <arpa/inet.h>
 #include <ctype.h>
+#include <fnmatch.h>
 #include <inttypes.h>
+#include <iostream>
 #include <limits.h>
 #include <netinet/in.h>
 #include <signal.h>
@@ -659,3 +664,130 @@ end:
        }
        return ret;
 }
+
+namespace {
+template <typename FilterFunctionType>
+lttng::cli::session_list get_sessions(const FilterFunctionType& filter,
+                                     bool return_first_match_only = false)
+{
+       lttng::cli::session_list list = []() {
+               int list_ret;
+               struct lttng_session *psessions;
+
+               list_ret = lttng_list_sessions(&psessions);
+
+               if (list_ret < 0) {
+                       LTTNG_THROW_CTL("Failed to list sessions",
+                                       static_cast<lttng_error_code>(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) {
+               if (!filter(list[read_from])) {
+                       continue;
+               }
+
+               if (read_from != write_to) {
+                       list[write_to] = list[read_from];
+               }
+
+               ++write_to;
+
+               if (return_first_match_only) {
+                       return lttng::cli::session_list(std::move(list), 1);
+               }
+       }
+
+       list.resize(write_to);
+
+       return list;
+}
+} /* namespace */
+
+lttng::cli::session_list lttng::cli::list_sessions(const struct session_spec& spec)
+{
+       switch (spec.type_) {
+       case lttng::cli::session_spec::type::NAME:
+               if (spec.value == nullptr) {
+                       const auto configured_name =
+                               lttng::make_unique_wrapper<char, lttng::memory::free>(
+                                       get_session_name());
+
+                       if (!configured_name) {
+                               LTTNG_THROW_CLI_NO_DEFAULT_SESSION();
+                       }
+
+                       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(
+                       [&spec](const lttng_session& session) {
+                               return strcmp(session.name, spec.value) == 0;
+                       },
+                       true);
+       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 lttng::cli::session_spec::type::ALL:
+               return get_sessions([](const lttng_session&) { return true; });
+       }
+
+       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;
+       }
+}