lttng: start: ensure a cmd_error_code is returned by the command

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

diff --git a/src/bin/lttng/utils.hpp b/src/bin/lttng/utils.hpp
index bb1c2cdfbbbbeba767fec438a51d3d14c9750f17..4fa15c38d2f26a689e93d34c8896d7e1b8fb8bdc 100644 (file)
--- a/src/bin/lttng/utils.hpp
+++ b/src/bin/lttng/utils.hpp
@@ -8,19 +8,158 @@
 #ifndef _LTTNG_UTILS_H
 #define _LTTNG_UTILS_H
 
-#include <popt.h>
 #include <common/argpar/argpar.h>
 #include <common/dynamic-array.hpp>
+#include <common/make-unique-wrapper.hpp>
 
 #include <lttng/lttng.h>
 
+#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;
 
+struct session_spec {
+       enum type {
+               NAME,
+               GLOB_PATTERN,
+               ALL,
+       };
+
+       type type;
+       const char *value;
+};
+
+/*
+ * We don't use a std::vector here because it would make a copy of the C array.
+ */
+class session_list {
+       template <typename ContainerType, typename DereferenceReturnType>
+       class iterator_template : public std::iterator<std::random_access_iterator_tag, std::size_t> {
+       public:
+               explicit iterator_template(ContainerType& list, std::size_t k) : _list(list), _index(k)
+               {
+               }
+
+               iterator_template& operator++() noexcept
+               {
+                       ++_index;
+                       return *this;
+               }
+
+               iterator_template& operator--() noexcept
+               {
+                       --_index;
+                       return *this;
+               }
+
+               iterator_template& operator++(int) noexcept
+               {
+                       _index++;
+                       return *this;
+               }
+
+               iterator_template& operator--(int) noexcept
+               {
+                       _index--;
+                       return *this;
+               }
+
+               bool operator==(iterator_template other) const noexcept
+               {
+                       return _index == other._index;
+               }
+
+               bool operator!=(iterator_template other) const noexcept
+               {
+                       return !(*this == other);
+               }
+
+               DereferenceReturnType& operator*() const noexcept
+               {
+                       return _list[_index];
+               }
+
+       private:
+               ContainerType& _list;
+               std::size_t _index;
+       };
+
+       using iterator = iterator_template<session_list, lttng_session>;
+       using const_iterator = iterator_template<const session_list, const lttng_session>;
+
+public:
+       session_list() : _sessions_count(0), _sessions(nullptr)
+       {
+       }
+
+       session_list(session_list&& original, std::size_t new_count)
+       {
+               _sessions_count = new_count;
+               _sessions = std::move(original._sessions);
+       }
+
+       session_list(struct lttng_session *raw_sessions, std::size_t raw_sessions_count)
+       {
+               _sessions_count = raw_sessions_count;
+               _sessions.reset(raw_sessions);
+       }
+
+       iterator begin() noexcept
+       {
+               return iterator(*this, 0);
+       }
+
+       iterator end() noexcept
+       {
+               return iterator(*this, _sessions_count);
+       }
+
+       const_iterator begin() const noexcept
+       {
+               return const_iterator(*this, 0);
+       }
+
+       const_iterator end() const noexcept
+       {
+               return const_iterator(*this, _sessions_count);
+       }
+
+       std::size_t size() const noexcept
+       {
+               return _sessions_count;
+       }
+
+       void resize(std::size_t new_size) noexcept
+       {
+               _sessions_count = new_size;
+       }
+
+       lttng_session& operator[](std::size_t index)
+       {
+               LTTNG_ASSERT(index < _sessions_count);
+               return _sessions.get()[index];
+       }
+
+       const lttng_session& operator[](std::size_t index) const
+       {
+               LTTNG_ASSERT(index < _sessions_count);
+               return _sessions.get()[index];
+       }
+
+private:
+       std::size_t _sessions_count;
+       std::unique_ptr<lttng_session,
+                       lttng::details::create_unique_class<lttng_session, lttng::free>>
+               _sessions;
+};
+
 char *get_session_name(void);
 char *get_session_name_quiet(void);
 void list_commands(struct cmd_struct *commands, FILE *ofp);
@@ -47,8 +186,7 @@ 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 +194,12 @@ 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);
+
+session_list list_sessions(const struct session_spec& spec);
 
 #endif /* _LTTNG_UTILS_H */