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// Copyright 2015 The Vanadium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Linux-specific bits of the system clock implementation.
package vclock
import (
// Linux stores elapsed time in /proc/uptime as seconds since boot, with up to
// two decimal points of precision.
// NOTE(jlodhia): Go's syscall.Sysinfo() returns elapsed time in seconds
// (rounded to the nearest second). Beware.
func (*realSystemClock) ElapsedTime() (time.Duration, error) {
var sysInfo syscall.Sysinfo_t
if err := syscall.Sysinfo(&sysInfo); err != nil {
return 0, err
return time.Duration(sysInfo.Uptime) * time.Second, nil