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Rename Schunix to SchOS; the kernel becomes SchIFT

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Removes the "-unix" element and with it any trademark exposure to The
Open Group.

The split follows the ecosystem layout: SchOS is the system, and the
kernel has its own name. Kernel-identity strings are the only places
that take SchIFT -- uname(2) sysname, /proc/version, and the two licence
sentences that say "kernel" outright. That is what every Unix does here:
`uname -s` on Linux reports the kernel, not the distribution. Everything
a user reads as the product -- panic screen, boot menu, error prefixes,
docs, LICENSE, NOTICE -- is SchOS.

schunix.img is schos.img, the logo assets and the musl TLS patch are
renamed, and __SCHUNIX__ is __SCHOS__ (the define and the patch that
consumes it moved together).

Two things the rename broke, both found by the bootcheck suite:

  - shmtest wrote "SCHUNIX-MMAP-OK" with a hardcoded length of 15 and
    compared it back by hand-counted offsets (m[3]=='U', m[14]=='K').
    The shorter marker left the write running two bytes past the literal
    and the compare reading past the data, failing a file-backed mmap
    that was working correctly. Now written and compared through one
    constant with sizeof.
  - bootcheck asserted a 31-byte file after appending to
    "hello-from-schunix"; the shorter string makes it 29.

Both are the same mistake: a string literal whose length is written out
somewhere else. Full suite green -- base, Tty, Ps, Sock, Fb, Usb, Evdev.
This commit is contained in:
Nexoniarz 2026-08-09 14:09:59 +02:00
commit e04ca28812
83 changed files with 520 additions and 601 deletions
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4
docs/layout.md
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@ -9,7 +9,7 @@ that can't be rebuilt (except upstream tarballs, which live in `dist/` and are
deliberately kept out of `clean`).
```
schunix/
schos/
├─ boot/ Stage 1 MBR + stage 2 loader (splash, F8 menu, kernel load)
├─ kernel/ The kernel, by subsystem: arch/ core/ dev/ fs/ proc/ sys/
├─ include/ Headers shared by kernel, userland, and tools/mkfs
@ -19,7 +19,7 @@ schunix/
│ cmd/<name>/main.c → sysroot/bin/<name>
├─ ports/ Third-party software — one directory per port.
│ Contains ONLY a Makefile and optional patches/.
├─ projects/ Things that run ON Schunix rather than things that ARE it:
├─ projects/ Things that run ON SchOS rather than things that ARE it:
│ the compositor, window manager, desktop, and installer.
│ Not part of the kernel build. See projects/README.md.
├─ tools/ Host-side helpers, SOURCE ONLY: mkfs.c, the SchFS test