Hello,
I am in the process of porting a JNI dynamic library to
Unix that was developed on wiindows. I have made
some errors and would like to debug but am having
some troubles using ddd and gdb.
The following snippets are from the stderr stream
when I run without the debugger and just crash.
I get this signal:
SIGTRAP 5* trace trap
stackpointer=0xbffff17c
I am using:
Full thread dump Classic VM (Linux_JDK_1.2_pre-release-v2, native threads):
The main thread stack trace looks like
"main" (TID:0x404d41e0, sys_thread_t:0x804c238, state:R, native ID:0x400)
prio=5
at fp.platformInterface.EFoo.nInitialize(Native Method)
at fp.platformInterface.EFoo.Initialize(Compiled Code)
at fp.platformInterface.EFoo.<init>(Compiled Code)
at fp.app.MaintApp.main(Compiled Code)
This tells me that the dynamic lib was loaded, but that it died in
nInitialize(), a method of my JNI lib. This is where I woul like to
start debugging.
How do I set the breakpoint in the dynamic lib (loaded from EFoo's static
initializer block)? The problem I am suffering with is that the
file to debug is the java executable. I can set break points in java but I
can't seem to get the dynamic library loaded so as to set the
breakpoint in the jni lib. Trying gdb command
add-symbol-file ./lib/libEFoo.so
produces
"Don't know how to get text start location for this file" message. I
tried to load before "run" and after the "run" command (stopped
on breakpoint in java's main) was executed. Same result either way.
I have also tried "add-shared-symbol-file" gdb command but
the answer back from gdb is that this command is not supported.
Using ddd's "open program" menu item allows me to load the
jni lib so I can see the symbols and set a break point
but changes the target to the lib.
Could anyone help guide this tired newbie through this
sticking point? Or am I missing the big picture and this is
not my problem? Any help would be much appreciated.
Thanks for reading this far,
Rich Johnson
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