BUG#11331 "Warning: could not add log destination" message does not provide enough info

Implement error reporting to Logger and associated classes.


ndb/include/logger/LogHandler.hpp:
  Add error string to LogHandler along with error code
ndb/include/logger/Logger.hpp:
  Add reporting back of error to addHandler(BaseString).
ndb/src/common/logger/FileLogHandler.cpp:
  Implement error reporting
ndb/src/common/logger/LogHandler.cpp:
  Implement error reporting.
  
  Trim spaces and tabs out of parameter names. This allows "p=v, param=value"
ndb/src/common/logger/Logger.cpp:
  Report back errors when adding a handler via BaseString
ndb/src/common/logger/SysLogHandler.cpp:
  Report an error on invalid syslog facility
ndb/src/mgmsrv/MgmtSrvr.cpp:
  Report error when adding log handler

ndb/include/logger/LogHandler.hpp

@@ -125,6 +125,18 @@ public:
    */
   void setErrorCode(int code);
 
+  /**
+   * Returns the error string.
+   */
+  char* getErrorStr();
+
+  /**
+   * Sets the error string.
+   *
+   * @param str the error string.
+   */
+  void setErrorStr(char* str);
+
   /**
    * Parse logstring parameters
    *
@@ -195,6 +207,7 @@ private:
 
   const char* m_pDateTimeFormat;
   int m_errorCode;
+  char* m_errorStr;
 
   // for handling repeated messages
   unsigned m_count_repeated_messages;

ndb/include/logger/Logger.hpp

@@ -178,8 +178,11 @@ public:
    * Add a new handler
    *
    * @param logstring string describing the handler to add
+   * @param err OS errno in event of error
+   * @param len max length of errStr buffer
+   * @param errStr logger error string in event of error
    */
-  bool addHandler(const BaseString &logstring);
+  bool addHandler(const BaseString &logstring, int *err, int len, char* errStr);
 
   /**
    * Remove a log handler.