b663783717
For 3rd parties building binary packages, and for build consistency in general, it is very helpful to have the same set of dependencies at any time the product is built. See [tools/godep](https://github.com/tools/godep) for further details.
294 lines
6.6 KiB
Go
294 lines
6.6 KiB
Go
// 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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// +build darwin dragonfly freebsd linux netbsd openbsd solaris
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package unix
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import (
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"runtime"
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"sync"
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"syscall"
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"unsafe"
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)
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var (
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Stdin = 0
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Stdout = 1
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Stderr = 2
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)
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const (
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darwin64Bit = runtime.GOOS == "darwin" && sizeofPtr == 8
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dragonfly64Bit = runtime.GOOS == "dragonfly" && sizeofPtr == 8
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netbsd32Bit = runtime.GOOS == "netbsd" && sizeofPtr == 4
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solaris64Bit = runtime.GOOS == "solaris" && sizeofPtr == 8
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)
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// Do the interface allocations only once for common
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// Errno values.
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var (
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errEAGAIN error = syscall.EAGAIN
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errEINVAL error = syscall.EINVAL
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errENOENT error = syscall.ENOENT
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)
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// errnoErr returns common boxed Errno values, to prevent
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// allocations at runtime.
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func errnoErr(e syscall.Errno) error {
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switch e {
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case 0:
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return nil
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case EAGAIN:
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return errEAGAIN
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case EINVAL:
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return errEINVAL
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case ENOENT:
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return errENOENT
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}
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return e
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}
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// Mmap manager, for use by operating system-specific implementations.
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type mmapper struct {
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sync.Mutex
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active map[*byte][]byte // active mappings; key is last byte in mapping
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mmap func(addr, length uintptr, prot, flags, fd int, offset int64) (uintptr, error)
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munmap func(addr uintptr, length uintptr) error
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}
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func (m *mmapper) Mmap(fd int, offset int64, length int, prot int, flags int) (data []byte, err error) {
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if length <= 0 {
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return nil, EINVAL
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}
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// Map the requested memory.
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addr, errno := m.mmap(0, uintptr(length), prot, flags, fd, offset)
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if errno != nil {
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return nil, errno
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}
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// Slice memory layout
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var sl = struct {
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addr uintptr
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len int
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cap int
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}{addr, length, length}
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// Use unsafe to turn sl into a []byte.
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b := *(*[]byte)(unsafe.Pointer(&sl))
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// Register mapping in m and return it.
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p := &b[cap(b)-1]
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m.Lock()
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defer m.Unlock()
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m.active[p] = b
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return b, nil
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}
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func (m *mmapper) Munmap(data []byte) (err error) {
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if len(data) == 0 || len(data) != cap(data) {
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return EINVAL
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}
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// Find the base of the mapping.
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p := &data[cap(data)-1]
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m.Lock()
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defer m.Unlock()
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b := m.active[p]
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if b == nil || &b[0] != &data[0] {
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return EINVAL
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}
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// Unmap the memory and update m.
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if errno := m.munmap(uintptr(unsafe.Pointer(&b[0])), uintptr(len(b))); errno != nil {
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return errno
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}
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delete(m.active, p)
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return nil
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}
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func Read(fd int, p []byte) (n int, err error) {
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n, err = read(fd, p)
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if raceenabled {
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if n > 0 {
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raceWriteRange(unsafe.Pointer(&p[0]), n)
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}
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if err == nil {
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raceAcquire(unsafe.Pointer(&ioSync))
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}
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}
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return
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}
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func Write(fd int, p []byte) (n int, err error) {
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if raceenabled {
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raceReleaseMerge(unsafe.Pointer(&ioSync))
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}
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n, err = write(fd, p)
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if raceenabled && n > 0 {
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raceReadRange(unsafe.Pointer(&p[0]), n)
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}
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return
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}
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// For testing: clients can set this flag to force
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// creation of IPv6 sockets to return EAFNOSUPPORT.
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var SocketDisableIPv6 bool
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type Sockaddr interface {
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sockaddr() (ptr unsafe.Pointer, len _Socklen, err error) // lowercase; only we can define Sockaddrs
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}
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type SockaddrInet4 struct {
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Port int
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Addr [4]byte
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raw RawSockaddrInet4
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}
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type SockaddrInet6 struct {
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Port int
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ZoneId uint32
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Addr [16]byte
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raw RawSockaddrInet6
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}
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type SockaddrUnix struct {
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Name string
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raw RawSockaddrUnix
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}
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func Bind(fd int, sa Sockaddr) (err error) {
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ptr, n, err := sa.sockaddr()
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if err != nil {
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return err
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}
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return bind(fd, ptr, n)
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}
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func Connect(fd int, sa Sockaddr) (err error) {
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ptr, n, err := sa.sockaddr()
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if err != nil {
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return err
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}
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return connect(fd, ptr, n)
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}
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func Getpeername(fd int) (sa Sockaddr, err error) {
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var rsa RawSockaddrAny
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var len _Socklen = SizeofSockaddrAny
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if err = getpeername(fd, &rsa, &len); err != nil {
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return
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}
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return anyToSockaddr(&rsa)
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}
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func GetsockoptInt(fd, level, opt int) (value int, err error) {
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var n int32
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vallen := _Socklen(4)
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err = getsockopt(fd, level, opt, unsafe.Pointer(&n), &vallen)
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return int(n), err
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}
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func Recvfrom(fd int, p []byte, flags int) (n int, from Sockaddr, err error) {
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var rsa RawSockaddrAny
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var len _Socklen = SizeofSockaddrAny
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if n, err = recvfrom(fd, p, flags, &rsa, &len); err != nil {
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return
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}
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if rsa.Addr.Family != AF_UNSPEC {
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from, err = anyToSockaddr(&rsa)
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}
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return
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}
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func Sendto(fd int, p []byte, flags int, to Sockaddr) (err error) {
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ptr, n, err := to.sockaddr()
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if err != nil {
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return err
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}
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return sendto(fd, p, flags, ptr, n)
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}
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func SetsockoptByte(fd, level, opt int, value byte) (err error) {
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return setsockopt(fd, level, opt, unsafe.Pointer(&value), 1)
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}
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func SetsockoptInt(fd, level, opt int, value int) (err error) {
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var n = int32(value)
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return setsockopt(fd, level, opt, unsafe.Pointer(&n), 4)
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}
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func SetsockoptInet4Addr(fd, level, opt int, value [4]byte) (err error) {
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return setsockopt(fd, level, opt, unsafe.Pointer(&value[0]), 4)
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}
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func SetsockoptIPMreq(fd, level, opt int, mreq *IPMreq) (err error) {
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return setsockopt(fd, level, opt, unsafe.Pointer(mreq), SizeofIPMreq)
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}
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func SetsockoptIPv6Mreq(fd, level, opt int, mreq *IPv6Mreq) (err error) {
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return setsockopt(fd, level, opt, unsafe.Pointer(mreq), SizeofIPv6Mreq)
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}
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func SetsockoptICMPv6Filter(fd, level, opt int, filter *ICMPv6Filter) error {
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return setsockopt(fd, level, opt, unsafe.Pointer(filter), SizeofICMPv6Filter)
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}
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func SetsockoptLinger(fd, level, opt int, l *Linger) (err error) {
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return setsockopt(fd, level, opt, unsafe.Pointer(l), SizeofLinger)
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}
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func SetsockoptString(fd, level, opt int, s string) (err error) {
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return setsockopt(fd, level, opt, unsafe.Pointer(&[]byte(s)[0]), uintptr(len(s)))
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}
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func SetsockoptTimeval(fd, level, opt int, tv *Timeval) (err error) {
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return setsockopt(fd, level, opt, unsafe.Pointer(tv), unsafe.Sizeof(*tv))
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}
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func Socket(domain, typ, proto int) (fd int, err error) {
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if domain == AF_INET6 && SocketDisableIPv6 {
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return -1, EAFNOSUPPORT
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}
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fd, err = socket(domain, typ, proto)
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return
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}
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func Socketpair(domain, typ, proto int) (fd [2]int, err error) {
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var fdx [2]int32
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err = socketpair(domain, typ, proto, &fdx)
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if err == nil {
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fd[0] = int(fdx[0])
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fd[1] = int(fdx[1])
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}
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return
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}
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func Sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) {
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if raceenabled {
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raceReleaseMerge(unsafe.Pointer(&ioSync))
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}
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return sendfile(outfd, infd, offset, count)
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}
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var ioSync int64
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func CloseOnExec(fd int) { fcntl(fd, F_SETFD, FD_CLOEXEC) }
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func SetNonblock(fd int, nonblocking bool) (err error) {
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flag, err := fcntl(fd, F_GETFL, 0)
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if err != nil {
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return err
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}
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if nonblocking {
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flag |= O_NONBLOCK
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} else {
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flag &= ^O_NONBLOCK
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}
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_, err = fcntl(fd, F_SETFL, flag)
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return err
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}
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