Source file src/vendor/golang.org/x/net/route/syscall.go

     1	// Copyright 2016 The Go Authors. All rights reserved.
     2	// Use of this source code is governed by a BSD-style
     3	// license that can be found in the LICENSE file.
     4	
     5	// +build dragonfly freebsd netbsd openbsd
     6	
     7	package route
     8	
     9	import (
    10		"syscall"
    11		"unsafe"
    12	)
    13	
    14	var zero uintptr
    15	
    16	func sysctl(mib []int32, old *byte, oldlen *uintptr, new *byte, newlen uintptr) error {
    17		var p unsafe.Pointer
    18		if len(mib) > 0 {
    19			p = unsafe.Pointer(&mib[0])
    20		} else {
    21			p = unsafe.Pointer(&zero)
    22		}
    23		_, _, errno := syscall.Syscall6(syscall.SYS___SYSCTL, uintptr(p), uintptr(len(mib)), uintptr(unsafe.Pointer(old)), uintptr(unsafe.Pointer(oldlen)), uintptr(unsafe.Pointer(new)), newlen)
    24		if errno != 0 {
    25			return error(errno)
    26		}
    27		return nil
    28	}
    29	

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