[Feature] Add -extended-stats for *nix platforms

On *nix platforms, there is now a `-extended-stats` option that will
print out some extended statistics for the test. The statistics are
based on information gleaned from the `TCP_INFO` of the underlying TCP
connections. What is implemented so far is just a proof of concept of
the extended stats that could be calculated. Depending on what users
want, we can add additional extended statistics.

1 files changed, 22 insertions, 0 deletions

diff --git a/extendedstats/other.go b/extendedstats/other.go
new file mode 100644
index 0000000..c0f89ed
--- /dev/null
+++ b/extendedstats/other.go
@@ -0,0 +1,22 @@
+//go:build !darwin && !dragonfly && !freebsd && !linux && !netbsd && !openbsd
+// +build !darwin,!dragonfly,!freebsd,!linux,!netbsd,!openbsd
+
+package extendedstats
+
+import (
+	"net"
+
+	"golang.org/x/sys/unix"
+)
+
+type ExtendedStats struct{}
+
+func (es *ExtendedStats) IncorporateConnectionStats(conn net.Conn) {}
+
+func (es *ExtendedStats) Repr() string {
+	return ""
+}
+
+func ExtendedStatsAvailable() bool {
+	return false
+}