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fix: DRM flip re-opens /scheme/drm/card0 instead of try_clone

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Scheme files on Redox don't support try_clone(). Re-opening
the device node for each page flip is safe because DRM ioctls
are synchronous and the scheme serializes requests internally.
This commit is contained in:
Vasilito
2026-05-06 13:20:02 +01:00
parent 7e4af94f59
commit 962a2f1670
1 changed files with 8 additions and 5 deletions
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local/recipes/wayland/redbear-compositor/source/src/main.rs
+8 -5
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@@ -163,11 +163,14 @@ mod drm_backend {
let cur = self.current.load(Ordering::Relaxed); let cur = self.current.load(Ordering::Relaxed);
let next = (cur + 1) % self.fb_ids.len(); let next = (cur + 1) % self.fb_ids.len();
let fb_id = self.fb_ids[next]; let fb_id = self.fb_ids[next];
let mut f = self.file.try_clone().ok(); // Page flip: write [u64_le ioctl][u32_le fb_id] to scheme
if let Some(ref mut f) = f { let mut buf = Vec::with_capacity(12);
let mut buf = Vec::with_capacity(12); buf.extend_from_slice(&(DRM_IOCTL_MODE_PAGE_FLIP as u64).to_le_bytes());
buf.extend_from_slice(&(DRM_IOCTL_MODE_PAGE_FLIP as u64).to_le_bytes()); buf.extend_from_slice(&fb_id.to_le_bytes());
buf.extend_from_slice(&fb_id.to_le_bytes()); // Scheme I/O requires mutable access, so we re-open the device.
// This is safe because DRM ioctls are synchronous and the scheme
// serializes requests internally.
if let Ok(mut f) = File::open("/scheme/drm/card0") {
let _ = f.write_all(&buf); let _ = f.write_all(&buf);
} }
self.current.store(next, Ordering::Relaxed); self.current.store(next, Ordering::Relaxed);