From 9b980f5e6e6d586bbfc48ca8b2f695389574323e Mon Sep 17 00:00:00 2001
From: Fabian Homborg <FHomborg@gmail.com>
Date: Thu, 13 Dec 2018 10:26:15 +0100
Subject: [PATCH] Use fstatvfs if ST_LOCAL is available

Allows us to sometimes use mmap on NetBSD (proper capitalization is
important).
---
 src/wutil.cpp | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/wutil.cpp b/src/wutil.cpp
index ceb3620c5..13001bef6 100644
--- a/src/wutil.cpp
+++ b/src/wutil.cpp
@@ -311,7 +311,13 @@ int fd_check_is_remote(int fd) {
             // Other FSes are assumed local.
             return 0;
     }
-#elif defined(MNT_LOCAL) && !defined(__NetBSD__)
+#elif defined(ST_LOCAL)
+    // ST_LOCAL is a flag to statvfs, which is itself standardized.
+    // In practice the only system to use this path is NetBSD.
+    struct statvfs buf {};
+    if (fstatvfs(fd, &buf) < 0) return -1;
+    return (buf.f_flag & ST_LOCAL) ? 0 : 1;
+#elif defined(MNT_LOCAL)
     struct statfs buf {};
     if (fstatfs(fd, &buf) < 0) return -1;
     return (buf.f_flags & MNT_LOCAL) ? 0 : 1;