From 7c5acceda5991f7bc5a8ea227969a882ca0bf050 Mon Sep 17 00:00:00 2001
From: rUv <ruv@ruv.net>
Date: Fri, 20 Feb 2026 21:38:48 +0000
Subject: [PATCH] fix(rvlite): use platform-specific errno on macOS/BSD (fixes
 #174)

rvlite's writer_lease.rs used __errno_location (Linux libc) under a
generic #[cfg(unix)] guard, causing link failures on macOS where the
equivalent is __error. Split the extern and wrapper into separate
#[cfg(target_os)] blocks matching the pattern already used in
rvf-runtime/src/locking.rs.

Closes #174

Co-Authored-By: claude-flow <ruv@ruv.net>
---
 crates/rvlite/src/storage/writer_lease.rs | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/crates/rvlite/src/storage/writer_lease.rs b/crates/rvlite/src/storage/writer_lease.rs
index 87bb6a93a..e3c7f4cab 100644
--- a/crates/rvlite/src/storage/writer_lease.rs
+++ b/crates/rvlite/src/storage/writer_lease.rs
@@ -322,19 +322,33 @@ fn is_pid_alive(pid: u32) -> bool {
 #[cfg(unix)]
 extern "C" {
     fn kill(pid: i32, sig: i32) -> i32;
+}
+
+#[cfg(any(target_os = "linux", target_os = "android"))]
+extern "C" {
     fn __errno_location() -> *mut i32;
 }
 
+#[cfg(any(target_os = "macos", target_os = "ios", target_os = "freebsd"))]
+extern "C" {
+    fn __error() -> *mut i32;
+}
+
 #[cfg(unix)]
 unsafe fn libc_kill(pid: i32, sig: i32) -> i32 {
     unsafe { kill(pid, sig) }
 }
 
-#[cfg(unix)]
+#[cfg(any(target_os = "linux", target_os = "android"))]
 unsafe fn errno_location() -> *mut i32 {
     unsafe { __errno_location() }
 }
 
+#[cfg(any(target_os = "macos", target_os = "ios", target_os = "freebsd"))]
+unsafe fn errno_location() -> *mut i32 {
+    unsafe { __error() }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;