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Eclipse CDT and input/output redirection with GDB [message #521251]

Tue, 16 March 2010 18:18

Luigi Cotignano
Messages: 3
Registered: March 2010
Location: Italy

Junior Member

Hi all,
I'm using a customized version of Eclipse with CDT ("Esbox" for Nokia Maemo 5 with the Ubuntu distribution) to debug an application on a remote Linux target (Maemo 5).

I succeeded to execute/debug my application on the target using a Scratchbox Remote Shell (SBRSH) but I'm currently not able to redirect the input/output to a separate console (gnu-terminal) to interact with the application.

Note : The application uses ncurses libraries for graphics management.

I have just tried to edit the ".gdbinit" file and adding something like "tty /dev/pts/x" where the "x" is the ID number of my terminal instance, but it doesn't work. Sad

Can someone help me to solve this issue?

Many thanks in advance!

Regards,
Luigi

[Updated on: Thu, 20 May 2010 03:58]

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Re: Eclipse CDT and input/output redirection with GDB [message #534682 is a reply to message #521251]

Wed, 19 May 2010 17:03

Carlos Navarrette
Messages: 1
Registered: May 2010
Location: Oak Park, California, USA

Junior Member

Hi Luigi,
I have the same problem - getting Eclipse/gdb to debug an ncurses application. Did you ever figure out how to resolve the problem?

Thanks,

Carlos

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Re: Eclipse CDT and input/output redirection with GDB [message #534730 is a reply to message #534682]

Thu, 20 May 2010 03:36

Axel Mueller
Messages: 1828
Registered: July 2009

Senior Member

Quote:

I have just tried to edit the ".gdbinit" file and adding something like "/dev/pts/x" where the "x" is the ID number of my terminal instance, but it doesn't work.

You must add "tty /dev/pts/x".
See
http://wiki.eclipse.org/CDT/User/FAQ#HOWTO_debug_application s_which_require_a_real_terminal

Before you ask
- search this forum
- see the FAQ http://wiki.eclipse.org/CDT/User/FAQ
- google

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Re: Eclipse CDT and input/output redirection with GDB [message #534732 is a reply to message #534730]

Thu, 20 May 2010 03:57

Luigi Cotignano
Messages: 3
Registered: March 2010
Location: Italy

Junior Member

Hi Alex,
yes you are right. The line I added into the .gdbinit file was what you have indicated. I made a mistake in my first post. I'll fix it.

Thanks the same, but unfortunately it didn't solve the issue.

[Updated on: Thu, 20 May 2010 03:58]

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Re: Eclipse CDT and input/output redirection with GDB [message #536021 is a reply to message #521251]

Wed, 26 May 2010 12:40

James
Messages: 3
Registered: May 2010

Junior Member

I also had this same problem, and this is what I did to solve it:

Launch the application in a separate window. I put this code segment in the main to stop execution until I can attach the debugger. Mostly my bugs are after the first input prompt, so I don't need this anymore.

int debug = 1;
int main() {
   while (debug == 1) sleep(1);
   ...
}

Now, in Eclipse, create a "C/C++ Attach to Application" configuration. Fill out all the information (go through all the tabs), then hit apply, then Debug.
A window will pop up and you select the name of the running application to attach to. There is a bug in the current Galileo CDT in that it takes a long time to launch the debugger, but it will start. For me it sits at 36% complete in the lower right hand corner of the screen for a while. Then the prospective will switch to debug and your application is paused. Simply modify the "debug" variable from above to be zero (or whatever, not 1) and continue the app (the vcr play button at the top). Now the app will continue on to your bugs and breakpoints within the debugger!

For future launches of the debugger, you will have to select the specific debug configuration that you created, because the default always the regular terminal debug.

Cheers,
James.

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Re: Eclipse CDT and input/output redirection with GDB [message #536045 is a reply to message #536021]

Wed, 26 May 2010 14:37

Luigi Cotignano
Messages: 3
Registered: March 2010
Location: Italy

Junior Member

Hi James,
oh finally a solution! Many thanks for your reply. I'll use this trick to debug my app Smile

Cheers,
Luigi

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Re: Eclipse CDT and input/output redirection with GDB [message #536116 is a reply to message #536021]

Thu, 27 May 2010 03:08

Axel Mueller
Messages: 1828
Registered: July 2009

Senior Member

Quote:

There is a bug in the current Galileo CDT in that it takes a long time to launch the debugger, but it will start. For me it sits at 36% complete in the lower right hand corner of the screen for a while.

You should update (Menu Help->Check for Updates) to CDT 6.0.2. This bug is fixed there.

Before you ask
- search this forum
- see the FAQ http://wiki.eclipse.org/CDT/User/FAQ
- google

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Re: Eclipse CDT and input/output redirection with GDB [message #536252 is a reply to message #521251]

Thu, 27 May 2010 09:30

James
Messages: 3
Registered: May 2010

Junior Member

Yes, thank you. I updated and fixed the issue with the long debug startup time.

James.

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