4 ms·

How about the standard? http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3..

How about the standard? http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3...