feat: remove free command

system/system_monitor/config/mem_monitor.param.yaml

@@ -1,3 +1,5 @@
 /**:
   ros__parameters:
     available_size: 1024 # MB
+    usage_timeout: 5 # sec
+    ecc_timeout: 5 # sec

system/system_monitor/include/system_monitor/mem_monitor/mem_monitor.hpp

@@ -22,9 +22,14 @@
 
 #include <diagnostic_updater/diagnostic_updater.hpp>
 
+#include <boost/process.hpp>
+
 #include <climits>
 #include <map>
 #include <string>
+#include <unordered_map>
+
+namespace bp = boost::process;
 
 class MemMonitor : public rclcpp::Node
 {
@@ -58,6 +63,26 @@ class MemMonitor : public rclcpp::Node
    */
   void checkEcc(diagnostic_updater::DiagnosticStatusWrapper & stat);
 
+  /**
+   * @brief read /proc/meminfo
+   */
+  void readMemInfo(std::unordered_map<std::string, size_t> & memInfo);
+
+  /**
+   * @brief call readMemInfo and calculate memory usage
+   */
+  std::string readUsage(std::map<std::string, size_t> & map);
+
+  /**
+   * @brief execute edac-util command
+   */
+  std::string executeEdacUtil(std::string & output, std::string & pipe2_error_str);
+
+  /**
+   * @brief Timer callback to execute read infomation about usages and ecc
+   */
+  void onTimer();
+
   /**
    * @brief get human-readable output for memory size
    * @param [in] str size with bytes
@@ -70,6 +95,27 @@ class MemMonitor : public rclcpp::Node
   char hostname_[HOST_NAME_MAX + 1];  //!< @brief host name
 
   size_t available_size_;  //!< @brief Memory available size to generate error
+  int usage_timeout_;      //!< @brief Timeout duration for executing readUsage
+  int ecc_timeout_;        //!< @brief Timeout duration for executing edac-util command
+
+  rclcpp::TimerBase::SharedPtr
+    timer_;  //!< @brief Timer to execute readUsage and edac-utils command
+  rclcpp::CallbackGroup::SharedPtr timer_callback_group_;  //!< @brief Callback Group
+
+  std::mutex usage_mutex_;                   //!< @brief Mutex for output from /proc/meminfo
+  std::string usage_error_str_;              //!< @brief Error string
+  std::map<std::string, size_t> usage_map_;  //!< @brief Output of /proc/meminfo
+  double usage_elapsed_ms_;                  //!< @brief Execution time of readUsage
+  std::mutex usage_timeout_mutex_;  //!< @brief Mutex regarding timeout for executing readUsage
+
+  std::mutex ecc_mutex_;             //!< @brief Mutex for output from edac-util command
+  std::string ecc_error_str_;        //!< @brief Error string
+  std::string ecc_pipe2_error_str_;  //!< @brief Error string regarding pipe2 function call
+  std::string ecc_output_;           //!< @brief Output of edac-util command
+  double ecc_elapsed_ms_;            //!< @brief Execution time of edac-util command
+  std::mutex
+    ecc_timeout_mutex_;  //!< @brief Mutex regarding timeout for executing edac-util command
+  bool use_edac_util_;   //!< @brief Available to use edac-util command or not
 
   /**
    * @brief Memory usage status messages