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RE: [cdt-debug-dev] MI: obtaining GDB's stderr
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Derek,
Did you add your reader thread to CDT or it's a standalone application?
Mikhail
-----Original Message-----
From: cdt-debug-dev-bounces@xxxxxxxxxxx
[mailto:cdt-debug-dev-bounces@xxxxxxxxxxx] On Behalf Of Derek Morris
Sent: 17 November 2006 15:58
To: CDT Debug developers list
Subject: Re: [cdt-debug-dev] MI: obtaining GDB's stderr
Mikhail,
Yes, you are right, it doesn't close the stream.
I have now written a reader thread that sits on GDB's stderr and pumps
to System.out. It does nothing until GDB exits and then prints all of
the data written to stderr. That is, it is blocked on the first read of
GDB's stderr.
So, the data is being written to stderr, but for some reason, I am
unable to read it immediately.
Any further ideas?
Thanks,
--
Derek
Mikhail Khodjaiants wrote:
> A short comment. Did you try to set a breakpoint in this code? If
> exitValue for some reason doesn't throw an exception (a bug in the
> spawner) and there is no error message the error stream will be
closed,
> but the session will continue.
>
> -----Original Message-----
> From: cdt-debug-dev-bounces@xxxxxxxxxxx
> [mailto:cdt-debug-dev-bounces@xxxxxxxxxxx] On Behalf Of Mikhail
> Khodjaiants
> Sent: 17 November 2006 14:34
> To: CDT Debug developers list
> Subject: RE: [cdt-debug-dev] MI: obtaining GDB's stderr
>
> Derek,
>
> This code checks if the gdb process has terminated. "exitValue()"
> returns a value if the process has terminated, otherwise throws
> IllegalThreadStateException. The process can terminate at the startup
> for many reason. In this case this code reads the error message,
closes
> the error stream and throws Miexception to inform the client.
> If the process is running (normal situation) this code does nothing
> (catch IllegalThreadStateException).
>
> Mikhail
>
> -----Original Message-----
> From: cdt-debug-dev-bounces@xxxxxxxxxxx
> [mailto:cdt-debug-dev-bounces@xxxxxxxxxxx] On Behalf Of Derek Morris
> Sent: 16 November 2006 14:37
> To: CDT Debug developers list
> Subject: Re: [cdt-debug-dev] MI: obtaining GDB's stderr
>
> 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
>> _______________________________________________
>> cdt-debug-dev mailing list
>> cdt-debug-dev@xxxxxxxxxxx
>> https://dev.eclipse.org/mailman/listinfo/cdt-debug-dev
>>
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