gdb: GDB/MI Stream Records

 
 27.5.2 GDB/MI Stream Records
 ----------------------------
 
 GDB internally maintains a number of output streams: the console, the
 target, and the log.  The output intended for each of these streams is
 funneled through the GDB/MI interface using "stream records".
 
    Each stream record begins with a unique "prefix character" which
 identifies its stream (SeeGDB/MI Output Syntax GDB/MI Output
 Syntax.).  In addition to the prefix, each stream record contains a
 'STRING-OUTPUT'.  This is either raw text (with an implicit new line) or
 a quoted C string (which does not contain an implicit newline).
 
 '"~" STRING-OUTPUT'
      The console output stream contains text that should be displayed in
      the CLI console window.  It contains the textual responses to CLI
      commands.
 
 '"@" STRING-OUTPUT'
      The target output stream contains any textual output from the
      running target.  This is only present when GDB's event loop is
      truly asynchronous, which is currently only the case for remote
      targets.
 
 '"&" STRING-OUTPUT'
      The log stream contains debugging messages being produced by GDB's
      internals.