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