How to tell if a file is actually a socket?

[Seth Hoenig]

I have a program which does a bit of scanning through files, and right now
I'm running into issues where std.File.isfile() is reporting sockets as
files, which is problematic, because sockets cause segfaults when I try to
read them.

This is the output of ls -lha on the directory with the socket:

srwxr-xr-x  1 seth seth    0 2010-08-09 20:54 SingletonSocket


So how can I detect if a file is actually a socket?
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