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// Copyright 2009 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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// This code is a duplicate of syscall/syscall_linux_386.go with small
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// On x86 Linux, all the socket calls go through an extra indirection,
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// I think because the 5-register system call interface can't handle
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// the 6-argument calls like sendto and recvfrom. Instead the
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// arguments to the underlying system call are the number below and a
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// pointer to an array of uintptr. We hide the pointer in the
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// socketcall assembly to avoid allocation on every system call.
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// See /usr/include/linux/net.h.
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var socketcall func(call int, a0, a1, a2, a3, a4, a5 uintptr) (int, syscall.Errno)
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func getsockopt(fd int, level int, name int, v uintptr, l *sysSockoptLen) error {
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if _, errno := socketcall(_GETSOCKOPT, uintptr(fd), uintptr(level), uintptr(name), uintptr(v), uintptr(unsafe.Pointer(l)), 0); errno != 0 {
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func setsockopt(fd int, level int, name int, v uintptr, l uintptr) error {
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if _, errno := socketcall(_SETSOCKOPT, uintptr(fd), uintptr(level), uintptr(name), v, l, 0); errno != 0 {