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Implement Unix Domain Sockets for Local IPC

hard3/8

Implement Shell Pipeline: Connect Commands with Pipes Implement Shared Memory for Fast IPC

Language

Compiler

2.0s Limit 256MB

Submit and pass all tests to enable saving to GitHub.

Implementation

Implement Unix domain socket server and client.

Requirements:

Create server socket with AF_UNIX, SOCK_STREAM
Bind to filesystem path (e.g., /tmp/mysocket)
Listen for connections
Accept client connection
Receive and send data
Close connection and server socket
Unlink socket file

Client:

Create client socket
Connect to server path
Send message
Receive response
Close socket

Test:

Start server, listen for connections
Client connects and sends message
Server receives and replies
Both close properly
Socket file removed

Why This Matters

AF_UNIX sockets are exactly how the Docker daemon exposes its API at `/var/run/docker.sock`, how X11 clients talk to the display server, and how systemd's D-Bus implementation passes messages locally, all chosen specifically because filesystem permissions on the socket path double as an access-control mechanism. The `SCM_RIGHTS` file-descriptor-passing feature mentioned here is a real production technique: privilege-separated daemons like OpenSSH use it to hand a already-opened, permission-checked fd to an unprivileged worker process.

Hints

0 / 3 revealed

Validation Suite

main.c

Workspace 1.0

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