| // 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 |
| } |