nexoniarz/SchOS
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Initial commit: Schunix as it stands before the SchOS rename

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An x86-64 operating system built from xv6, now largely rewritten: SMP,
a copy-on-write root filesystem (SchFS), PCI/USB/virtio drivers, a TTF
rasteriser, and a Linux-numbered syscall ABI.

No history before this point -- the tree was never under version control.
This commit exists so the rename that follows has something to undo to.
This commit is contained in:
Nexoniarz 2026-08-09 13:47:01 +02:00
commit d0f7acf9eb
275 changed files with 51417 additions and 0 deletions
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43
include/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 Schunix'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) */
// Schunix-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