From c13806d3846ab4c738756722b9c30e4e1c36c35c Mon Sep 17 00:00:00 2001
From: sisungo <sisungo@protonmail.com>
Date: Fri, 9 Jul 2021 20:14:29 +0800
Subject: [PATCH] Change `os.rs` to build on musl libc

---
 vm/src/stdlib/os.rs | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/vm/src/stdlib/os.rs b/vm/src/stdlib/os.rs
index a8dc67f9a..412a91d40 100644
--- a/vm/src/stdlib/os.rs
+++ b/vm/src/stdlib/os.rs
@@ -1563,8 +1563,12 @@ mod _os {
 
         // Safety: p_offset_src and p_offset_dst is a unique pointer for offset_src and offset_dst respectively,
         // and will only be freed after this function ends.
+        //
+        // Why not use `libc::copy_file_range`: On `musl-libc`, `libc::copy_file_range` is not provided. Therefore
+        // we use syscalls directly instead.
         let ret = unsafe {
-            libc::copy_file_range(
+            libc::syscall(
+                libc::SYS_copy_file_range,
                 args.src,
                 p_offset_src as *mut i64,
                 args.dst,