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diff --git a/src/runtime/sys_darwin_amd64.s b/src/runtime/sys_darwin_amd64.s
index e09b906ba5..fa8ff2f65c 100644
--- a/src/runtime/sys_darwin_amd64.s
+++ b/src/runtime/sys_darwin_amd64.s
@@ -157,6 +157,7 @@ systime:
// Fall back to system call (usually first call in this thread).
MOVQ SP, DI
MOVQ $0, SI
+ MOVQ $0, DX // required as of Sierra; Issue 16570
MOVL $(0x2000000+116), AX
SYSCALL
CMPQ AX, $0
diff --git a/src/syscall/syscall_darwin_amd64.go b/src/syscall/syscall_darwin_amd64.go
index 70b53b87f4..79083117b6 100644
--- a/src/syscall/syscall_darwin_amd64.go
+++ b/src/syscall/syscall_darwin_amd64.go
@@ -26,14 +26,21 @@ func NsecToTimeval(nsec int64) (tv Timeval) {
}
//sysnb gettimeofday(tp *Timeval) (sec int64, usec int32, err error)
-func Gettimeofday(tv *Timeval) (err error) {
- // The tv passed to gettimeofday must be non-nil
- // but is otherwise unused. The answers come back
- // in the two registers.
+func Gettimeofday(tv *Timeval) error {
+ // The tv passed to gettimeofday must be non-nil.
+ // Before macOS Sierra (10.12), tv was otherwise unused and
+ // the answers came back in the two registers.
+ // As of Sierra, gettimeofday return zeros and populates
+ // tv itself.
sec, usec, err := gettimeofday(tv)
- tv.Sec = sec
- tv.Usec = usec
- return err
+ if err != nil {
+ return err
+ }
+ if sec != 0 || usec != 0 {
+ tv.Sec = sec
+ tv.Usec = usec
+ }
+ return nil
}
func SetKevent(k *Kevent_t, fd, mode, flags int) {
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