net/internal/socket/sys_linux_386.go

// Copyright 2017 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.

package socket

import (
	"syscall"
	"unsafe"
)

const (
	sysSETSOCKOPT = 0xe
	sysGETSOCKOPT = 0xf
)

func socketcall(call, a0, a1, a2, a3, a4, a5 uintptr) (uintptr, syscall.Errno)
func rawsocketcall(call, a0, a1, a2, a3, a4, a5 uintptr) (uintptr, syscall.Errno)

func getsockopt(s uintptr, level, name int, b []byte) (int, error) {
	l := uint32(len(b))
	_, errno := socketcall(sysGETSOCKOPT, s, uintptr(level), uintptr(name), uintptr(unsafe.Pointer(&b[0])), uintptr(unsafe.Pointer(&l)), 0)
	return int(l), errnoErr(errno)
}

func setsockopt(s uintptr, level, name int, b []byte) error {
	_, errno := socketcall(sysSETSOCKOPT, s, uintptr(level), uintptr(name), uintptr(unsafe.Pointer(&b[0])), uintptr(len(b)), 0)
	return errnoErr(errno)
}