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How to debug forked processes [message #854739]

Tue, 24 April 2012 03:47

Eclipse User

Hi,

I have a setup where a server calls fork() and then from the child process it will launch a program using execv();

My issue is once it has done this the forked process is not debuggable. I have tried enabling debug forked processes in the CDT settting (I am on indigo) but it doesn't work.

Is there some setting in the gdbinit or something to get this running?

Thanks

Re: How to debug forked processes [message #854747 is a reply to message #854739]

Tue, 24 April 2012 03:57

Eclipse User

Here are the requirements for multi-process debugging.
http://wiki.eclipse.org/CDT/User/FAQ#How_do_I_use_multi-process_debugging.3F

Re: How to debug forked processes [message #854763 is a reply to message #854747]

Tue, 24 April 2012 04:13

Eclipse User

hmm I have definitely tried the 2nd option of ticking the debug forked processes and it never hit any of the breakpoints in any of the forked processes.

I will try the disconnect and reconnect approach again tomorrrow, I am pretty sure I tried that as well.

thanks

Re: How to debug forked processes [message #854779 is a reply to message #854763]

Tue, 24 April 2012 04:27

Eclipse User

If it does not work you can have a look a the gdb output
http://wiki.eclipse.org/CDT/User/FAQ#I.27ve_been_asked_for_.27gdb_traces.27.2C_where_can_I_find_them.3F

Re: How to debug forked processes [message #855070 is a reply to message #854779]

Tue, 24 April 2012 09:50

Eclipse User

We may not be handling the execv() call.
Try the GDB option (in your .gdbinit, or typing it in the gdb console:
set follow-exec-mode <?>
http://sourceware.org/gdb/onlinedocs/gdb/Forks.html

If that works and you'd like to have that in Eclipse, please open a bug.
http://bugs.eclipse.org/bugs

Thanks

Marc

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