493 def read_from_meminfo(key):  argument
569 def sysctl(key, value=None):  argument
583 def sysctl_kernel(key, value=None):  argument
729 def freespace(path):  argument
1288 def is_mountpoint(path):  argument
1292 def require_mountpoint(path):  argument
1545 def _open_file(path):  argument
1554 def _get_line_from_file(path, line):  argument
1572 def _get_match_from_file(path, line, prefix, postfix):  argument
1586 def _get_float_from_file(path, line, prefix, postfix):  argument
1591 def _get_int_from_file(path, line, prefix, postfix):  argument
1596 def _get_hex_from_file(path, line, prefix, postfix):  argument
1734 def get_board_property(key):  argument