Sim Shared Memory Bridge Utility for Linux

Wrapper programs to map shared memory from Linux for access by Wine and Proton.

Compilation

Prerequisits

This project is used by my Monocoque project which is a device manager for Simulators. It depends on simapi for the headers for the various simulators that are supported. When pulling lastest if the submodule does not download run:

git submodule sync --recursive
git submodule update --init --recursive

Then to compile wrapper for various shared memory files...

Assetto Corsa and Assetto Corsa Competizione

make CFLAGS=-DASSETTOCORSA

Project Cars 2 and Automobilista 2

make CFLAGS=-DPROJECTCARS2

This will compile 3 separate files: createsimshm - creates linux shared memory files that can be mapped into wine simshmbridge.exe - bridges shared memory between wine and Linux ( always needed ) bridge - manually moves memory into Linux shared memory for Simulators that do no like it if simshmbridge.exe creates and owns the shared memory file

Basic Mapping Examples

The best way is to run the wrapper from the Proton Launch Command. And in a separate terminal or tab start ./createsimshm.

Assetto Corsa and Assetto Corsa Competizione

%command% & sleep 5 && ~/.steam/steam/steamapps/common/Proton\ 8.0/proton run ~/shmwrap/ac/simshmbridge.exe

Project Cars 2 and Automobilista 2

%command% & sleep 30 && ~/.steam/steam/steamapps/common/Proton\ 8.0/proton run ~/shmwrap/pcars2/simshmbridge.exe ~/shmwrap/pcars2/bridge

Manually

./createsimshm

in a separate terminal

protontricks --no-runtime --background-wineserver -c "wine /path/to/simshmbridge.exe" 244210

you can exit createsimshm by pressing "q" and simshmbridge.exe by pressing ctrl-c

Mapping from Linux Shared Memory back to Wine

This is useful if there is another app such as Crewchief that uses Shared Memory, and you'd like to have a separate dedicated wine prefix just for Crewchief.

For example, for Assetto Corsa, rename simshmbridge.exe to acs.exe, then

CREWCHIEF_WINEPREFIX="${HOME}/.wine"

export WINEPREFIX="${CREWCHIEF_WINEPREFIX}"
export WINEARCH="win64"

wine /home/racerx/shmwrap/ac/acs.exe

make sure createsimshm is running and the shared memory files are in /dev/shm. then you can start crewchief however you are starting crewchief. One could even add this to a launcher, but you'd need separate launchers for each sim. Crewchief looks for certain executable names to know if the sim is running. To determine the name of the executable, I read the code here

ToDo

• Support more sims/programs