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(gdb.info)GDB/MI Stream Records

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GDB/MI Stream Records
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   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 (Note: 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.

`"&" STRING-OUTPUT'
     The log stream contains debugging messages being produced by GDB's
     internals.