diff --git a/vendor/golang.org/x/sys/unix/timestruct.go b/vendor/golang.org/x/sys/unix/timestruct.go
index 4a672f5..3d89304 100644
--- a/vendor/golang.org/x/sys/unix/timestruct.go
+++ b/vendor/golang.org/x/sys/unix/timestruct.go
@@ -2,18 +2,17 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris
+//go:build aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris || zos
+// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris zos
 
 package unix
 
 import "time"
 
-// TimespecToNsec converts a Timespec value into a number of
-// nanoseconds since the Unix epoch.
-func TimespecToNsec(ts Timespec) int64 { return int64(ts.Sec)*1e9 + int64(ts.Nsec) }
+// TimespecToNSec returns the time stored in ts as nanoseconds.
+func TimespecToNsec(ts Timespec) int64 { return ts.Nano() }
 
-// NsecToTimespec takes a number of nanoseconds since the Unix epoch
-// and returns the corresponding Timespec value.
+// NsecToTimespec converts a number of nanoseconds into a Timespec.
 func NsecToTimespec(nsec int64) Timespec {
 	sec := nsec / 1e9
 	nsec = nsec % 1e9
@@ -42,12 +41,10 @@
 	return ts, nil
 }
 
-// TimevalToNsec converts a Timeval value into a number of nanoseconds
-// since the Unix epoch.
-func TimevalToNsec(tv Timeval) int64 { return int64(tv.Sec)*1e9 + int64(tv.Usec)*1e3 }
+// TimevalToNsec returns the time stored in tv as nanoseconds.
+func TimevalToNsec(tv Timeval) int64 { return tv.Nano() }
 
-// NsecToTimeval takes a number of nanoseconds since the Unix epoch
-// and returns the corresponding Timeval value.
+// NsecToTimeval converts a number of nanoseconds into a Timeval.
 func NsecToTimeval(nsec int64) Timeval {
 	nsec += 999 // round up to microsecond
 	usec := nsec % 1e9 / 1e3
@@ -59,24 +56,22 @@
 	return setTimeval(sec, usec)
 }
 
-// Unix returns ts as the number of seconds and nanoseconds elapsed since the
-// Unix epoch.
+// Unix returns the time stored in ts as seconds plus nanoseconds.
 func (ts *Timespec) Unix() (sec int64, nsec int64) {
 	return int64(ts.Sec), int64(ts.Nsec)
 }
 
-// Unix returns tv as the number of seconds and nanoseconds elapsed since the
-// Unix epoch.
+// Unix returns the time stored in tv as seconds plus nanoseconds.
 func (tv *Timeval) Unix() (sec int64, nsec int64) {
 	return int64(tv.Sec), int64(tv.Usec) * 1000
 }
 
-// Nano returns ts as the number of nanoseconds elapsed since the Unix epoch.
+// Nano returns the time stored in ts as nanoseconds.
 func (ts *Timespec) Nano() int64 {
 	return int64(ts.Sec)*1e9 + int64(ts.Nsec)
 }
 
-// Nano returns tv as the number of nanoseconds elapsed since the Unix epoch.
+// Nano returns the time stored in tv as nanoseconds.
 func (tv *Timeval) Nano() int64 {
 	return int64(tv.Sec)*1e9 + int64(tv.Usec)*1000
 }