Millisecond clock

[Guy Harris]

>The folowing program for millisecond sleep works under HP-UX SYSV,  so
>it should work on an ATT (serious finger crossing :-).

Crossing the fingers is a good idea here.  "Xxx works under HP-UX SYSV,
therefore it should work on an [arbitrary] ATT [System V release]" isn't
a valid deduction.  While some systems, including HP-UX, have
"setitimer()", which your program uses, vanilla AT&T System V releases
prior to S5R4 don't have it.