On Windows, use same share mode as files opened via fopen().

xyanrch · Apr 5, 2022 · fc15d16 · fc15d16
1 parent 419fd52
commit fc15d16
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/include/boost/asio/detail/impl/win_iocp_file_service.ipp b/include/boost/asio/detail/impl/win_iocp_file_service.ipp
@@ -68,6 +68,8 @@ boost::system::error_code win_iocp_file_service::open(
   else if ((open_flags & file_base::read_write) != 0)
     access = GENERIC_READ | GENERIC_WRITE;
 
+  DWORD share = FILE_SHARE_READ | FILE_SHARE_WRITE;
+
   DWORD disposition = 0;
   if ((open_flags & file_base::create) != 0)
   {
@@ -92,7 +94,7 @@ boost::system::error_code win_iocp_file_service::open(
   if ((open_flags & file_base::sync_all_on_write) != 0)
     flags |= FILE_FLAG_WRITE_THROUGH;
 
-  HANDLE handle = ::CreateFileA(path, access, 0, 0, disposition, flags, 0);
+  HANDLE handle = ::CreateFileA(path, access, share, 0, disposition, flags, 0);
   if (handle != INVALID_HANDLE_VALUE)
   {
     if (disposition == OPEN_ALWAYS && (open_flags & file_base::truncate) != 0)