It's a pity that it's provided with a ".html" suffix. When I view the
page in my browser, the #include directives are messed up, and
probably other things as well.
The problem is that the <pre> directive doesn't actually say to
display plain text without interpreting it; things that look like HTML
directives are still processed.
You can download the raw file, remove everything up to and including
the "<pre>" directive, and try to compile it.
But note that the code is inherently non-portable (as it must be,
since standard C doesn't have the required facilities). Of the
headers it includes, only two are standard:
And it failed to compile on four different systems I just tried
(Cygwin, Solaris, Red Hat, AIX) -- all of which already have their own
"ping" programs, of course.
A solution to the original problem that's fairly likely to work on any
system where this is even possible is
Keith Thompson (The_Other_Keith) email@example.com <http://www.ghoti.net/~kst>
San Diego Supercomputer Center <*> <http://users.sdsc.edu/~kst>
"We must do something. This is something. Therefore, we must do this."
-- Antony Jay and Jonathan Lynn, "Yes Minister"