From bc512648dbb27d895e69857202b22bc34d27f122 Mon Sep 17 00:00:00 2001
From: rpkak <rpkak@users.noreply.github.com>
Date: Sun, 31 Aug 2025 10:56:09 +0200
Subject: [PATCH] use copy_file_range syscall on linux

---
 lib/std/fs/File.zig  |  2 +-
 lib/std/os/linux.zig |  4 +++-
 lib/std/posix.zig    | 10 ++++++----
 3 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/lib/std/fs/File.zig b/lib/std/fs/File.zig
index a5a3955a24..99dda27885 100644
--- a/lib/std/fs/File.zig
+++ b/lib/std/fs/File.zig
@@ -1916,7 +1916,7 @@ pub const Writer = struct {
 
         const copy_file_range = switch (native_os) {
             .freebsd => std.os.freebsd.copy_file_range,
-            .linux => if (std.c.versionCheck(if (builtin.abi.isAndroid()) .{ .major = 34, .minor = 0, .patch = 0 } else .{ .major = 2, .minor = 27, .patch = 0 })) std.os.linux.wrapped.copy_file_range else {},
+            .linux => std.os.linux.wrapped.copy_file_range,
             else => {},
         };
         if (@TypeOf(copy_file_range) != void) cfr: {
diff --git a/lib/std/os/linux.zig b/lib/std/os/linux.zig
index ba2ab3c04f..1278128d21 100644
--- a/lib/std/os/linux.zig
+++ b/lib/std/os/linux.zig
@@ -9891,7 +9891,9 @@ pub const wrapped = struct {
     };
 
     pub fn copy_file_range(fd_in: fd_t, off_in: ?*i64, fd_out: fd_t, off_out: ?*i64, len: usize, flags: u32) CopyFileRangeError!usize {
-        const rc = system.copy_file_range(fd_in, off_in, fd_out, off_out, len, flags);
+        const use_c = std.c.versionCheck(if (builtin.abi.isAndroid()) .{ .major = 34, .minor = 0, .patch = 0 } else .{ .major = 2, .minor = 27, .patch = 0 });
+        const sys = if (use_c) std.c else std.os.linux;
+        const rc = sys.copy_file_range(fd_in, off_in, fd_out, off_out, len, flags);
         switch (errno(rc)) {
             .SUCCESS => return @intCast(rc),
             .BADF => return error.BadFileFlags,
diff --git a/lib/std/posix.zig b/lib/std/posix.zig
index abedcaf704..67d337a081 100644
--- a/lib/std/posix.zig
+++ b/lib/std/posix.zig
@@ -6515,14 +6515,16 @@ pub const CopyFileRangeError = error{
 ///
 /// Maximum offsets on Linux and FreeBSD are `maxInt(i64)`.
 pub fn copy_file_range(fd_in: fd_t, off_in: u64, fd_out: fd_t, off_out: u64, len: usize, flags: u32) CopyFileRangeError!usize {
-    if (builtin.os.tag == .freebsd or
-        (comptime builtin.os.tag == .linux and std.c.versionCheck(if (builtin.abi.isAndroid()) .{ .major = 34, .minor = 0, .patch = 0 } else .{ .major = 2, .minor = 27, .patch = 0 })))
-    {
+    if (builtin.os.tag == .freebsd or builtin.os.tag == .linux) {
+        const use_c = native_os != .linux or
+            std.c.versionCheck(if (builtin.abi.isAndroid()) .{ .major = 34, .minor = 0, .patch = 0 } else .{ .major = 2, .minor = 27, .patch = 0 });
+        const sys = if (use_c) std.c else linux;
+
         var off_in_copy: i64 = @bitCast(off_in);
         var off_out_copy: i64 = @bitCast(off_out);
 
         while (true) {
-            const rc = system.copy_file_range(fd_in, &off_in_copy, fd_out, &off_out_copy, len, flags);
+            const rc = sys.copy_file_range(fd_in, &off_in_copy, fd_out, &off_out_copy, len, flags);
             if (native_os == .freebsd) {
                 switch (errno(rc)) {
                     .SUCCESS => return @intCast(rc),