debug library loaded with ctypes using gdb

Question

I loaded in python a C library X.so, that I compiled with these flags.

GDBFLAGS = -gdwarf-2 -g3 -O0 -ggdb

and I call some of its non-static functions from python , using ctypes.

I wish debugging the C library X.so. Some function from X.so crashes sometimes, not all the time, and I wish monitoring the execution using gdb.

I use linux-gnu. How can I debug ctypes ?

Tom Tromey · Accepted Answer · 2014-03-08 03:57:03Z

6

Use "gdb python" and run your program as usual. Then when it crashes, debug as normal.

BTW I recommend using just "-g3". Don't use "-gdwarf-2", this does the wrong thing nowadays -- DWARF 2 is quite old actually and the default is newer now.

answered Mar 8, 2014 at 3:57

Tom Tromey

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1 Comment

Eryk Sun Over a year ago

gdb should be set up with libpython.py, such as is installed by Debian's python3.3-dbg package. It pretty prints Python objects and installs the commands py-print, py-locals, py-list, py-bt, py-bt-full, py-up, and py-down.

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