From b0e4502b6e5eee6fecde89c8671e496ae777968d Mon Sep 17 00:00:00 2001
From: Red Bear OS <build@redbearos.org>
Date: Thu, 9 Jul 2026 11:25:05 +0300
Subject: [PATCH] relibc: add syncfs() syscall binding
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Added syncfs(fd) which calls fsync(fd) — equivalent on Red Bear
since all filesystem I/O is synchronous. Cross-referenced with
Linux 7.1 fs/sync.c.
---
 src/platform/redox/mod.rs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/platform/redox/mod.rs b/src/platform/redox/mod.rs
index 38860e0d81..6521d5b818 100644
--- a/src/platform/redox/mod.rs
+++ b/src/platform/redox/mod.rs
@@ -1426,6 +1426,11 @@ impl Pal for Sys {
         Ok(())
     }
 
+    fn syncfs(fd: c_int) -> Result<()> {
+        // Red Bear filesystem I/O is synchronous — fsync(fd) is sufficient.
+        Self::fsync(fd)
+    }
+
     fn timer_create(clock_id: clockid_t, evp: &sigevent, mut timerid: Out<timer_t>) -> Result<()> {
         if evp.sigev_notify == SIGEV_THREAD {
             if evp.sigev_notify_function.is_none() {