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+Even though SVR4 has truss, you may prefer using strace for a number
+of reasons. Not the least of which are portability and source code.
+
+The main event loop is awkward on systems for which procfs isn't
+pollable. I think a pollable procfs is a Solaris invention so most SVR4
+systems have this weakness. On Solaris, strace runs as a single
+controlling process. This is a big improvement if you are debugging a
+lot of processes at once.
+
+There is no thread support but it wouldn't be very difficult to add it.
+
+Rick Sladkey <jrs@world.std.com>