The Implementation of the ULIX Literate Operating System








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A diary documenting the implementation of ULIX-i386

Welcome to the ULIX blog.

Ulix (Literate Unix) is a Unix-like operating system developed at University of Erlangen-Nürnberg. I use D. E. Knuth's concept of Literate Programming for the implementation and documentation. The goal was a fully working system which can be used in operating system courses to show students how OS concepts (such as paging and scheduling) can be implemented. Literate programs are very accessible because they can be read like a book; the order of presentation is not enforced by program logic or compiler restrictions, but instead is guided by the implementer's creative process.

Ulix is written in C and assembler for the Intel architecture. The literate programming part is handled by noweb.

On this page I document my progress with the implementation.

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Filesystem: Directories, link, unlink (15.07.2013)

The Minix code is almost complete: Ulix can now access sub-directories and files inside those. Relative paths are converted into absolute paths, and the new functions link() and unlink() are finished. This can all be tested in user mode, the shell has built-in commands cd, touch, cp, ln, rm.

All filesystem actions have been tested (with fsck.minix), they all leave the filesystem valid.

What's missing is little things (mkdir, rmdir, symlink; I'll add those in the next days) and double indirection which I won't implement, it is only needed for files larger than 263 KByte, and those are not likely on 1.44 MB floppies.

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