cygwin or gdb question

Igor Peshansky
Tue Apr 3 16:55:00 GMT 2007

On Tue, 3 Apr 2007, Bob Rossi wrote:

> Hi,
> I have one more cgdb issue that seems to be cygwin related. However, it
> could be a gdb issue. I'm not sure.
> In verison cgdb-0.6.3 I start GDB up on a pipe and communicate with it
> over the pipe. This works fine, except that GDB behaves slightly
> differently when it is invoked on a pipe rather than a pty. That is,
> GDB provides interactive questions to the user when it's on a pty
> and not when it's on a pipe.
> In svn trunk for CGDB I began starting GDB on a pty and communicating
> with it that way. This fixed a bug for a user on max os X and provided
> the user with a GDB that acted more like it was on an actual terminal.
> This seems to work fine on linux, however I noticed a difference on
> Cygwin. I compile a large GUI application and debug it. I set
> no breakpoints and type 'r', do some stuff and the GUI and then stop.
> The debugger is hanging, waiting for something interesting to happen.
> If I type ctrl-c on linux, it interupts the debugger so that I can
> set a breakpoint or do something else interesting. If I do this on
> cygwin, it doesn't interupt the program.
> In fact, this isn't just a problem with CGDB, the exact same results
> happen with gdb. So, is it a cygwin or gdb issue that it appears that
> you can interupt the inferior when gdb is on a pipe, but not when it's
> on a terminal.
> Is there an easy way for me to test starting gdb on a pipe outside of
> CGDB? I would like to reproduce that gdb does interupt the inferior when
> ctrl-c is typed and GDB is started on a pipe.

Yes.  Use CYGWIN=tty or rxvt.
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