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

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

diff --git a/src/bin/lttng/utils.hpp b/src/bin/lttng/utils.hpp
index bb1c2cdfbbbbeba767fec438a51d3d14c9750f17..d790e74d4f8bed24b89cbe768656c202df311266 100644 (file)
--- a/src/bin/lttng/utils.hpp
+++ b/src/bin/lttng/utils.hpp
@@ -8,19 +8,136 @@
 #ifndef _LTTNG_UTILS_H
 #define _LTTNG_UTILS_H
 
-#include <popt.h>
 #include <common/argpar/argpar.h>
+#include <common/container-wrapper.hpp>
 #include <common/dynamic-array.hpp>
+#include <common/make-unique-wrapper.hpp>
 
 #include <lttng/lttng.h>
+#include <lttng/session-internal.hpp>
+
+#include <iterator>
+#include <memory>
+#include <popt.h>
 
 extern char *opt_relayd_path;
 extern int opt_no_sessiond;
-extern char * opt_sessiond_path;
+extern char *opt_sessiond_path;
 extern pid_t sessiond_pid;
 
 struct cmd_struct;
 
+namespace lttng {
+namespace cli {
+
+struct session_spec {
+       enum class type {
+               NAME,
+               GLOB_PATTERN,
+               ALL,
+       };
+
+       explicit session_spec(type spec_type, const char *name_or_pattern = nullptr) noexcept :
+               type_(spec_type), value(name_or_pattern)
+       {
+       }
+
+       /* Disambiguate type enum from the member for buggy g++ versions. */
+       type type_;
+       const char *value;
+};
+
+class session_list;
+
+namespace details {
+class session_storage {
+public:
+       session_storage(lttng_session *raw_sessions, std::size_t sessions_count) :
+               _array(raw_sessions), _count(sessions_count)
+       {
+       }
+
+       session_storage(session_storage&& original) :
+               _array(std::move(original._array)), _count(original._count)
+       {
+       }
+
+       session_storage(session_storage&& original, std::size_t new_count) :
+               _array(std::move(original._array)), _count(new_count)
+       {
+       }
+
+       lttng_session_uptr _array = nullptr;
+       std::size_t _count = 0;
+};
+
+class session_list_operations {
+public:
+       static lttng_session& get(const lttng::cli::details::session_storage& storage,
+                                 std::size_t index) noexcept
+       {
+               return storage._array[index];
+       }
+
+       static std::size_t size(const lttng::cli::details::session_storage& storage)
+       {
+               return storage._count;
+       }
+};
+} /* namespace details */
+
+/*
+ * We don't use a std::vector here because it would make a copy of the C array.
+ */
+class session_list
+       : public lttng::utils::random_access_container_wrapper<details::session_storage,
+                                                              lttng_session&,
+                                                              details::session_list_operations> {
+public:
+       friend details::session_list_operations;
+
+       session_list() :
+               lttng::utils::random_access_container_wrapper<details::session_storage,
+                                                             lttng_session&,
+                                                             details::session_list_operations>(
+                       { nullptr, 0 })
+       {
+       }
+
+       session_list(session_list&& original) :
+               lttng::utils::random_access_container_wrapper<details::session_storage,
+                                                             lttng_session&,
+                                                             details::session_list_operations>(
+                       std::move(original._container))
+       {
+       }
+
+       session_list(session_list&& original, std::size_t new_count) :
+               lttng::utils::random_access_container_wrapper<details::session_storage,
+                                                             lttng_session&,
+                                                             details::session_list_operations>(
+                       { std::move(original._container), new_count })
+       {
+       }
+
+       session_list(lttng_session *raw_sessions, std::size_t raw_sessions_count) :
+               lttng::utils::random_access_container_wrapper<details::session_storage,
+                                                             lttng_session&,
+                                                             details::session_list_operations>(
+                       { raw_sessions, raw_sessions_count })
+       {
+       }
+
+       void resize(std::size_t new_size) noexcept
+       {
+               _container._count = new_size;
+       }
+};
+
+lttng::cli::session_list list_sessions(const struct session_spec& spec);
+} /* namespace cli */
+} /* namespace lttng */
+
 char *get_session_name(void);
 char *get_session_name_quiet(void);
 void list_commands(struct cmd_struct *commands, FILE *ofp);
@@ -47,8 +164,7 @@ int get_count_order_ulong(unsigned long x);
 
 const char *get_event_type_str(enum lttng_event_type event_type);
 
-int print_missing_or_multiple_domains(unsigned int domain_count,
-               bool include_agent_domains);
+int print_missing_or_multiple_domains(unsigned int domain_count, bool include_agent_domains);
 
 int spawn_relayd(const char *pathname, int port);
 int check_relayd(void);
@@ -56,11 +172,16 @@ void print_session_stats(const char *session_name);
 int get_session_stats_str(const char *session_name, char **str);
 int show_cmd_help(const char *cmd_name, const char *help_msg);
 
-int print_trace_archive_location(
-               const struct lttng_trace_archive_location *location,
-               const char *session_name);
+int print_trace_archive_location(const struct lttng_trace_archive_location *location,
+                                const char *session_name);
 
 int validate_exclusion_list(const char *event_name,
-               const struct lttng_dynamic_pointer_array *exclusions);
+                           const struct lttng_dynamic_pointer_array *exclusions);
+
+/*
+ * Ask the sessiond for the more details on the status of the kernel tracer and
+ * print it to stderr.
+ */
+void print_kernel_tracer_status_error();
 
 #endif /* _LTTNG_UTILS_H */