4.4 BSD does.
@comment sys/resource.h
+@comment Unix98
+@item RLIMIT_AS
+@vindex RLIMIT_AS
+The maximum size of total memory that this process should get. If the
+process tries to allocate more memory beyond this amount with, for
+example, @code{brk}, @code{malloc}, @code{mmap} or @code{sbrk}, the
+allocation function fails.
+
+@comment sys/resource.h
@comment BSD
@item RLIM_NLIMITS
@vindex RLIM_NLIMITS