I wrote something similar for sockets (https://github.com/spc476/ipacld https://github.com/spc476/ipacld) but it's Linux only, since only Linux supports passing

I wrote something similar for sockets (https://github.com/spc476/ipacld https://github.com/spc476/ipacld) but it's Linux only, since only Linux supports passing the userid/groupid/pid of a process across Unix domain sockets (and I use that for checking credentials).