From a55a3604bd65a6d42f41ce09a36ac295a90c7b28 Mon Sep 17 00:00:00 2001
From: Martchus <martchus@gmx.net>
Date: Sun, 23 Apr 2023 21:04:31 +0200
Subject: [PATCH] Fallback from sendfile64() in case of ENOSYS as well

As suggested on https://man7.org/linux/man-pages/man2/sendfile.2.html.
---
 io/copy.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/io/copy.h b/io/copy.h
index d8441fb..dba0ec2 100644
--- a/io/copy.h
+++ b/io/copy.h
@@ -114,7 +114,7 @@ template <std::size_t bufferSize> void CopyHelper<bufferSize>::copy(NativeFileSt
         while (count) {
             const auto bytesCopied = ::sendfile64(output.fileDescriptor(), input.fileDescriptor(), nullptr, count);
             if (bytesCopied < 0) {
-                if (errno == EINVAL && static_cast<std::uint64_t>(totalBytes) == count) {
+                if ((errno == EINVAL || errno == ENOSYS) && static_cast<std::uint64_t>(totalBytes) == count) {
                     // try again the unoptimized version, maybe the filesystem doesn't support sendfile
                     goto unoptimized_version;
                 }
@@ -163,7 +163,7 @@ void CopyHelper<bufferSize>::callbackCopy(NativeFileStream &input, NativeFileStr
             const auto bytesToCopy = static_cast<std::size_t>(std::min(count, static_cast<std::uint64_t>(bufferSize)));
             const auto bytesCopied = ::sendfile64(output.fileDescriptor(), input.fileDescriptor(), nullptr, bytesToCopy);
             if (bytesCopied < 0) {
-                if (errno == EINVAL && static_cast<std::uint64_t>(totalBytes) == count) {
+                if ((errno == EINVAL || errno == ENOSYS) && static_cast<std::uint64_t>(totalBytes) == count) {
                     // try again the unoptimized version, maybe the filesystem doesn't support sendfile
                     goto unoptimized_version;
                 }