[Gammaray-interest] LD_PRELOADing on QNX

[Volker Krause]

Hi,

GammaRay on QNX should work, and ARM64 also works, the combination however is 
untested.

Regarding "raw" injection with LD_PRELOAD, while not officially intended that 
way, it mostly works in practice. The main problem is getting settings to the 
probe, as the usual channel for that isn't available (a local socket, which is 
where the error Christian posted comes from).

By default GammaRay will try to pick the right network interface to listen for 
connections on, but it might end up picking some internal interface or none at 
all. The --listen command line parameter allows you to change that normally, 
to send this to a manually injected GammaRay use the GAMMARAY_ServerAddress 
environment variable.

So the following example works here on Linux at least, forcing a non-standard 
port and making it listen only for local connection (you probably want the 
external IP instead, to achieve the opposite):
export GAMMARAY_ServerAddress="tcp://127.0.0.1:12345"
LD_PRELOAD=<prefix>/gammaray/2.11/qt5_12-x86_64/gammaray_probe.so <target>

I hope this helps a bit.

Regards,
Volker

On Friday, 22 March 2019 18:48:53 CET Cristian Adam wrote:
> Hi,
> 
> I am trying to use Gamma Ray on a QNX ARM64 system.
> 
> The system has Qt 5.12 configured without "useless" things like QProcess,
> which leaves me the option to just build the GammaRay probe.
> 
> I have successfully build it. But now I don't know how to enable it in the
> system.
> 
> I've tried putting in /etc/profile in
> LD_PRELOAD=/opt/qt5/lib/libgammaray_probe-qt5_12-arm.so, but if I do an
> nmap -sT, no network port gets opened.
> 
> How do I enable remote access to this system?
> 
> Cheers,
> Cristian.
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