How to detect when a UNIX socket is closed when reading

[mikaelstaldal]

I am developing a program which communicates with a Docker daemon, with HTTP over UNIX socket, using hyperlocal.

The problem I have is that it doesn't detect when the Docker daemon closes the socket. This is necessary when attaching to a container, since I want my program to exit when the container stops and it has consumed all output from the container (just like the docker attach command does). If I forcefully exit immediately when the container has stopped, I might miss some output.

I want this loop to exit when the socket is closed, but it doesn't:
https://github.com/mikaelstaldal/contained/blob/main/src/docker_client.rs#L197-L201

See whole project here: https://github.com/mikaelstaldal/contained

[Darksonn]

Unless you are stuck in write_all or flush, that code should work.

[mikaelstaldal]

Well, it doesn't. I just tried to comment out write_all and flush, just having an empty loop. It still doesn't exit.