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// Copyright 2012 Google, Inc. All rights reserved.
//
// Use of this source code is governed by a BSD-style license
// that can be found in the LICENSE file in the root of the source
// tree.
// +build linux
package afpacket
import (
"unsafe"
"golang.org/x/sys/unix"
)
// setsockopt provides access to the setsockopt syscall.
func setsockopt(fd, level, name int, val unsafe.Pointer, vallen uintptr) error {
_, _, errno := unix.Syscall6(
unix.SYS_SETSOCKOPT,
uintptr(fd),
uintptr(level),
uintptr(name),
uintptr(val),
vallen,
0,
)
if errno != 0 {
return error(errno)
}
return nil
}
// getsockopt provides access to the getsockopt syscall.
func getsockopt(fd, level, name int, val unsafe.Pointer, vallen uintptr) error {
_, _, errno := unix.Syscall6(
unix.SYS_GETSOCKOPT,
uintptr(fd),
uintptr(level),
uintptr(name),
uintptr(val),
vallen,
0,
)
if errno != 0 {
return error(errno)
}
return nil
}
// htons converts a short (uint16) from host-to-network byte order.
// Thanks to mikioh for this neat trick:
// https://github.com/mikioh/-stdyng/blob/master/afpacket.go
func htons(i uint16) uint16 {
return (i<<8)&0xff00 | i>>8
}
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