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eudev starts at boot; Xorg finds its input devices through it

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udevd and a one-shot trigger run from schinit, 10-schos.conf no longer lists
event0/event1, and the docs say what udev covers and what it does not.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EVRhxi9zpdW2uDUN4FVcao
This commit is contained in:
Nexoniarz 2026-10-26 11:44:21 +01:00
commit b3f72cd95e
13 changed files with 169 additions and 50 deletions
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2
docs/plan/1.0.md
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@ -114,7 +114,7 @@ it lives.
| `mprotect` is a no-op, nothing has NX | [kernel.md](../architecture/kernel.md) |
| No routing table | first interface wins, which is a rule and not routing — [networking.md](../architecture/networking.md) |
| No descriptor garbage collector | a socket passed over itself and never received leaks the pair |
| No udev / uevent socket | Xorg is told its input devices — [desktop.md](../architecture/desktop.md) |
| udev sees only the kernel's own devices | PCI and USB are not in the `/sys/devices` tree — [udev.md](../architecture/udev.md) |
| No EHCI driver | USB 2.0 ports wired only to EHCI do nothing — [usb.md](../architecture/usb.md) |
| Touchpads are mice | no two-finger scroll — [desktop.md](../architecture/desktop.md) |
| `ru_stime` is zero | [kernel.md](../architecture/kernel.md) |

9
docs/plan/roadmap.md
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@ -62,11 +62,10 @@ compositor worth running is years of work that Alpine already packages.) The des
Wayland compositor (labwc, sway, weston, a GNOME or KDE session) is the larger step. What Wayland — and a modern X — need
from the system, in the order they are useful:
1. **udev.** Today Xorg is *told* its input devices (`xorg.conf.d/10-schos.conf`) because nothing announces them. The fix is
Alpine's `eudev` (or `udev`) running on SchOS, which wants: a **uevent netlink socket** (`NETLINK_KOBJECT_UEVENT`, with the
`add`/`remove`/`change` messages and their environment), a real **`/sys/devices` tree** with `/sys/bus/*/devices/*` and
`/sys/class/*/*` as symlinks into it, `uevent` files that can be written to replay events (`udevadm trigger`), and devtmpfs
that udev can create nodes in. libinput then enumerates evdev devices through it.
1. **udev — done for the kernel's own devices** ([udev.md](../architecture/udev.md)). eudev runs from `schinit`, the uevent
netlink socket and the `/sys/devices` tree exist, devtmpfs takes udev's links, and Xorg finds its keyboard and mouse
through it. **Left:** PCI and USB devices in the same tree, with `add`/`remove` events from the hotplug thread, so a USB
keyboard or a GPU appears to udev; libinput then enumerates evdev devices through it.
2. **libinput and libseat** (seatd is in Alpine): evdev with the properties libinput reads (`ID_INPUT_*` from udev), and a way
for a non-root compositor to take the keyboard and the display from the kernel — the `VT_PROCESS` handshake exists.
3. **A DRM device.** Wayland compositors want `/dev/dri/card0` with KMS, and Mesa wants `renderD128`. SchOS has neither: it has