Developer builds Linux container from scratch to speed up AI agent sandboxing

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A developer is building ForkCage, an open-source Linux container project written in C++ that uses process forking to provide fast, isolated sandboxes for AI agents without the overhead of cold-starting new environments each time. The project relies on raw Linux syscalls and is primarily a learning exercise in understanding how containers work at a low level. Development revealed three notable bugs, including a deadlock caused by reading stdout and stderr sequentially rather than concurrently, which was resolved by draining both pipes simultaneously using separate threads. A second issue arose when chrooting into a fake root filesystem failed because dynamically linked binaries require shared libraries and a dynamic linker that were absent from the jail directory. The developer is continuing to extend the project and has shared the source code publicly on GitHub.

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