diff -r c040f992052f -r 1c52a0eeb952 vendor/golang.org/x/sys/unix/syscall_freebsd_amd64.go
--- a/vendor/golang.org/x/sys/unix/syscall_freebsd_amd64.go	Wed Sep 18 19:17:42 2019 +0200
+++ b/vendor/golang.org/x/sys/unix/syscall_freebsd_amd64.go	Sun Feb 16 18:54:01 2020 +0100
@@ -33,6 +33,10 @@
 	msghdr.Controllen = uint32(length)
 }
 
+func (msghdr *Msghdr) SetIovlen(length int) {
+	msghdr.Iovlen = int32(length)
+}
+
 func (cmsg *Cmsghdr) SetLen(length int) {
 	cmsg.Len = uint32(length)
 }
@@ -50,3 +54,9 @@
 }
 
 func Syscall9(num, a1, a2, a3, a4, a5, a6, a7, a8, a9 uintptr) (r1, r2 uintptr, err syscall.Errno)
+
+func PtraceIO(req int, pid int, addr uintptr, out []byte, countin int) (count int, err error) {
+	ioDesc := PtraceIoDesc{Op: int32(req), Offs: (*byte)(unsafe.Pointer(addr)), Addr: (*byte)(unsafe.Pointer(&out[0])), Len: uint64(countin)}
+	err = ptrace(PTRACE_IO, pid, uintptr(unsafe.Pointer(&ioDesc)), 0)
+	return int(ioDesc.Len), err
+}