From 4504feba82e157ea781b603911b90c5786ba268c Mon Sep 17 00:00:00 2001
From: Evgenii Stratonikov <evgeniy@nspcc.ru>
Date: Sat, 26 Nov 2022 13:20:35 +0300
Subject: [PATCH] Close `CreateFileMapping` handle after `MapViewOfFile`
 failure

mmap-go does this, see https://github.com/edsrzf/mmap-go/commit/82d537b921ff6268a1e4a1980dc66b9d1546759f

Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>
---
 bolt_windows.go | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/bolt_windows.go b/bolt_windows.go
index afc1a29..6cf07bd 100644
--- a/bolt_windows.go
+++ b/bolt_windows.go
@@ -82,6 +82,8 @@ func mmap(db *DB, sz int) error {
 	// Create the memory map.
 	addr, errno := syscall.MapViewOfFile(h, syscall.FILE_MAP_READ, 0, 0, 0)
 	if addr == 0 {
+		// Do our best and report error returned from MapViewOfFile.
+		_ = syscall.CloseHandle(h)
 		return os.NewSyscallError("MapViewOfFile", errno)
 	}