gdb: Any way to debug a segfault in a ROS node?

edit

Hi,

After a refactoring of my code, my node segfaults, so I would like to debug it with gdb. I used roslaunch with gdb prefix as indicated in this tutorial.

Nevertheless it seems that I'm able to see the error output. I have removed the "run" parameter to see if I can run it manually, add a breakpoint and so on. It works, but I cannot see neither what I type nor the standard output. For instance if I try typing the unexisting gdb command "hello", I see successfully:

Undefined command: "hello".  Try "help".

But if I run a gdb command that is successfully executed (breakpoint main, print argc, or whatever....), the prompt does not display anything.

I tried gdb --tty /dev/pts/4 but it redirects only my program, so gdb standard input and output are still invisible.

Moreover I get the error warning: GDB: Failed to set controlling terminal: Operation not permitted and also [tcsetpgrp failed in terminal_inferior: Inappropriate ioctl for device]. The last error seems to be a bug of gdb, so I've installed the last version 7.7, it's now solved but I still get the first error and no display except stderr.

What program do you use to debug your nodes? Any tip or trick to redirect the standard input/output in some terminal?

Many thanks