Cannot attach GDB - Connection refused

[Ranjit]

I am tyring to debug some JNI code running in the Android emulator.
Both the emulator and the host controlling the emulator are running on
the same Windows computer.

I did the following but I get a connection refused when I try to
attach gdb.

C:\android-sdk-windows\tools>adb shell
# gdbserver :12345 --attach 1478
gdbserver :12345 --attach 1478
Attached; pid = 1478
Listening on port 12345

$ /cygdrive/c/android-sdk-windows/android-ndk-r4/build/prebuilt/
windows/arm-eabi-4.2.1/bin/arm-eabi-gdb.exe
This GDB was configured as "--host=i686-pc-cygwin --target=arm-elf-
linux".
(gdb) target remote localhost:1234
localhost:1234: Connection refused.

What am I doing wrong?

Also, can someone explain the need for port forwarding if both the
debugger and the debuggee are running on the same computer?

Thanks,
Ranjit

[Angus Lees]

On Wed, May 26, 2010 at 12:22, Ranjit <ranji...@gmail.com> wrote:
> What am I doing wrong?

You use port 12345 in your gdbserver command and port 1234 in your gdb
target, which is fine but - you also need to use adb to forward the
host port to a port on the emulator (adb forward tcp:1234 tcp:12345 in
your example)

> Also, can someone explain the need for port forwarding if both the
> debugger and the debuggee are running on the same computer?

As far as gdb (and most of your system) is concerned, they are not
running on the same computer - it is almost impossible for a process
on your local machine to directly access a specific process inside the
Android emulator.
The emulator is a virtual machine and "adb" is effectively providing a
network connection between the real machine and the Android "machine".

- Gus

[Ranjit]

Thank you. Port forwarding did solve the issue and I can attach gdb to
the gdbserver.

On May 26, 12:01 am, Angus Lees <al...@google.com> wrote: