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include: one folder per subsystem, and includes that name it

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Sixty-five headers sat side by side in include/, so `#include "irq.h"`
said nothing about where irq.h was or what it belonged to, and errno.h,
stat.h and fcntl.h at the top shadowed the system's for any host tool
built with -I./include. They are in folders now -- arch/ core/ fs/
dev/ gfx/ net/ uapi/ (and ldls/ for the Linux driver layer) -- and
every include names the folder, as Linux's do: "core/proc.h".

Done mechanically and checked the hard way: the kernel built from this
tree disassembles identically to the one built from the tree before
it. The full image boots, and userland is the same set of programs.
Paths in docs and comments follow; docs/guides/layout.md has a table
of what is where, and tools/fix-includes.py rewrites old-style
includes from the folders in the tree, for code written before this.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01S1giNvrHTrPMPw7V6x1kQ4
This commit is contained in:
Nexoniarz 2026-10-23 15:05:12 +02:00
commit a1c965da1e
267 changed files with 1560 additions and 1440 deletions
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43
include/uapi/fcntl.h Normal file
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#pragma once
// open(2) flags.
//
// These are the *Linux x86-64* values, and they have to be: every program in
// the userland is built against a libc that sends Linux flag values, and the
// kernel reads them with these constants. They disagreed for a long time, with
// results that looked like filesystem corruption rather than like a mistake --
// Linux O_APPEND (0x400) landed on SchOS's O_TRUNC, so `cmd >> file`
// truncated the file it was meant to extend, and Linux O_TRUNC (0x200) landed
// on O_CREATE, so `cmd > file` left whatever was past the new end in place.
// Neither failure pointed anywhere near a header.
//
// Do not tidy these into a neat sequence. They are an external interface.
#define O_RDONLY 0x000000
#define O_WRONLY 0x000001
#define O_RDWR 0x000002
#define O_ACCMODE 0x000003
#define O_CREATE 0x000040 /* Linux O_CREAT (0100) */
#define O_CREAT O_CREATE /* the spelling every program uses */
#define O_EXCL 0x000080 /* Linux O_EXCL (0200) */
#define O_NOCTTY 0x000100 /* Linux O_NOCTTY (0400) */
#define O_TRUNC 0x000200 /* Linux O_TRUNC (01000) */
#define O_APPEND 0x000400 /* Linux O_APPEND (02000) */
#define O_NONBLOCK 0x000800 /* Linux O_NONBLOCK (04000); no-op here */
#define O_DIRECTORY 0x010000 /* Linux O_DIRECTORY (0200000) */
#define O_NOFOLLOW 0x020000 /* Linux O_NOFOLLOW (0400000) */
#define O_CLOEXEC 0x080000 /* Linux O_CLOEXEC (02000000) */
// SchOS-only, placed above every flag Linux defines so it can never be
// mistaken for one. 0x40000 was used before and collides with Linux O_NOATIME.
#define O_EXTENT 0x8000000 /* sparse-extent hint */
#define F_DUPFD 0
#define F_GETFD 1
#define F_SETFD 2
#define F_GETFL 3
#define F_SETFL 4
#define F_DUPFD_CLOEXEC 1030 // Linux value
#define FD_CLOEXEC 1