ARG_MAX			_SC_ARG_MAX
ATEXIT_MAX		_SC_ATEXIT_MAX
CHARCLASS_NAME_MAX	_SC_CHARCLASS_NAME_MAX
CHILD_MAX		_SC_CHILD_MAX
CLOCKTICKSPERSECOND /*clock ticks/second*/	_SC_CLK_TCK
COLL_WEIGHTS_MAX	_SC_COLL_WEIGHTS_MAX
HOST_NAME_MAX		_SC_HOST_NAME_MAX
IOV_MAX			_SC_IOV_MAX
LINE_MAX		_SC_LINE_MAX
LOGIN_NAME_MAX		_SC_LOGIN_NAME_MAX
NGROUPS_MAX		_SC_NGROUPS_MAX
OPEN_MAX		_SC_OPEN_MAX
PAGESIZE		_SC_PAGESIZE
PAGE_SIZE		_SC_PAGE_SIZE
RE_DUP_MAX		_SC_RE_DUP_MAX
STREAM_MAX		_SC_STREAM_MAX
SYMLOOP_MAX		_SC_SYMLOOP_MAX
TTY_NAME_MAX		_SC_TTY_NAME_MAX
TZNAME_MAX		_SC_TZNAME_MAX