sleep()ing less than a second

[Guy Harris]

>    Some time ago, I was posed with the problem of doing the equivalent
>of nap() on BSD.

The equivalent of "nap" in 4.3BSD is "usleep", and comes with the
system.  In 4.2BSD, you can either use "setitimer" etc. as you've done,
or you can use "select".

>Since SysV had nap(),

Correction.  *Some* versions of System V *may* have "nap()"; I don't
think it's universally available.  In System V Release 3, you may be
able to use "poll" in much the same way you use "select" in 4.2BSD.