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// Copyright 2016 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build darwin dragonfly freebsd netbsd openbsd
package route
import (
"syscall"
"unsafe"
)
var zero uintptr
func sysctl(mib []int32, old *byte, oldlen *uintptr, new *byte, newlen uintptr) error {
var p unsafe.Pointer
if len(mib) > 0 {
p = unsafe.Pointer(&mib[0])
} else {
p = unsafe.Pointer(&zero)
}
_, _, errno := syscall.Syscall6(syscall.SYS___SYSCTL, uintptr(p), uintptr(len(mib)), uintptr(unsafe.Pointer(old)), uintptr(unsafe.Pointer(oldlen)), uintptr(unsafe.Pointer(new)), uintptr(newlen))
if errno != 0 {
return error(errno)
}
return nil
}
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