freebsd: add initial support for running on FreeBSD, excluding Bluez,

ppd, and some things. Add a simple wpa_supplicant backend

core/internal/server/trayrecovery/suspend_linux.go

@@ -0,0 +1,25 @@
+package trayrecovery
+
+import (
+	"time"
+
+	"golang.org/x/sys/unix"
+)
+
+// timeSuspended returns how long the system has spent in suspend since boot.
+// It is the difference between CLOCK_BOOTTIME (includes suspend) and
+// CLOCK_MONOTONIC (excludes suspend).
+func timeSuspended() time.Duration {
+	var bt, mt unix.Timespec
+	if err := unix.ClockGettime(unix.CLOCK_BOOTTIME, &bt); err != nil {
+		return 0
+	}
+	if err := unix.ClockGettime(unix.CLOCK_MONOTONIC, &mt); err != nil {
+		return 0
+	}
+	diff := (bt.Sec-mt.Sec)*int64(time.Second) + (bt.Nsec - mt.Nsec)
+	if diff < 0 {
+		return 0
+	}
+	return time.Duration(diff)
+}