Re: [cdt-debug-dev] MI: obtaining GDB's stderr

[Derek Morris <dmsubs@xxxxxxxxxxxxx>]

Mikhail,

I think I have found why I cannot get to GDB's stderr. In MISession#setup:

	gdbProcess.exitValue();
	InputStream err = gdbProcess.getErrorStream();
	BufferedReader reader = new BufferedReader(new InputStreamReader(err));
	String line = null;
	try {
		line = reader.readLine();
		reader.close();
	} catch (Exception e) {
		// the reader may throw a NPE.
	}

This is done before the txThread and rxThread are start()ed.

So, it opens the error stream as a BufferedReader, reads and discards whatever 
it finds, and then closes it.

Q: When the BufferedReader closes, will it also close the err InputStream? i.e. 
when i try to open the ErrorStream later on, will it always be empty?

Q: Do you know why it might do this?

Thanks,

--
Derek


Mikhail Khodjaiants wrote:
> Hi Derek,
>
> In most cases the process returned by "getGDBProcess" is not a process
> that runs gdb. There is a class called Spawner that starts a gdb process
> and creates the pipes for stdin, stdout and stderr. The Spawner's native
> code is located in the "library" directory of the
> org.eclipse.cdt.core.<os> plugins. It may be a bug, I don't know if we
> have ever used the error stream from gdb.
>
> It would be very useful if you and other "monitor" users come up with
> the requirements on how to improve the support for "monitor" in general.
> My personal experience with it is very limited.
>
> Regards,
> Mikhail
>
> -----Original Message-----
> From: cdt-debug-dev-bounces@xxxxxxxxxxx
> [mailto:cdt-debug-dev-bounces@xxxxxxxxxxx] On Behalf Of Derek Morris
> Sent: 13 November 2006 16:59
> To: CDT Debug developers list
> Subject: [cdt-debug-dev] MI: obtaining GDB's stderr
>
> Hi,
>
> How can I get access to GDB's stderr? I am trying to obtain additional
> (error) information that is returned from a "monitor" command.
>
> I am using the following code but reader.ready() always returns false.
>
> MIProcess gdbProcess = miSession.getGDBProcess(); InputStream err =
> gdbProcess.getErrorStream(); BufferedReader reader = new
> BufferedReader(new InputStreamReader(
> 		err));
> String line = null;
> try {
> 	while (reader.ready()) {
> 		line = reader.readLine();
> 		errors.add(line) ;
> 	}
> 	reader.close();
> } catch (Exception e) {
> 	e.printStackTrace() ;// the reader may throw a NPE.
> }
>
> I know that data is being written to stderr - I just can't get it!
>
> TIA
> --
> Derek
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