| Multi-process debugging not hitting breakpoints [message #1748183] |
Sun, 20 November 2016 22:10  |
 Fabian Maurer
Messages: 1
Registered: November 2016 |
Junior Member |
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Hello there,
I'm currently trying to debug wine with eclipse, and have troubles getting breakpoints to work the way I want them to.
Using gdb 7.12 and eclipse oxygen (4.7.0 M3).
Wine consists of many libraries, and I'm trying to set a breakpoint in one of those libraries. Now I want the process to break if a certain library function is called.
It works fine as long as there is only one process, but if a new process is spawned by execv, then the breakpoints are ignored for that process. But I want all process that use the libraries to be debugged, and breaking at the breakpoint.
I tried enabling "Non stop mode" and "Automatically debug forked processes", but to no avail. The processes show up in the debug window, but breakpoints only work for the original process.
I googled around a lot, but I didn't find anything for that specific case. How can I achieve that, if it's possible?
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| Re: Multi-process debugging not hitting breakpoints [message #1749224 is a reply to message #1748183] |
Sat, 03 December 2016 16:49  |
Tauno Voipio
Messages: 742
Registered: August 2014 |
Senior Member |
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You have left out essential information, so I'll guess: You want to debug a shared library (.so) which is a component of the Wine emulator running under Linux.
There is a difference between a static library (.a) and a shared library (.so). A static library is a collection of linkable binary object modules. A shared library is a specially-built run file with information of the entry points of the component functions. The shared library is compiled into a location-independent format, so that the same code image can be run at different program addresses without any changes.
Your problem is at least partially off-topic. Please Google 'linux shared library debug'.
The main problem here is that different processes using a shared library may, and usually will, use different program-visible addresses for the same functions, so it is difficult for the debugger to know how to set the breakpoints.
For more information, please read tutorials on Linux memory handling.
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-TV
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Tauno Voipio
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