src/syscall/syscall_unix.go - go - Git at Google

 // Copyright 2009 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.

 //go:build unix

 package syscall

 import (
 	"internal/bytealg"
 	"internal/itoa"
 	"internal/oserror"
 	"internal/race"
 	"runtime"
 	"sync"
 	"unsafe"
 )

 var (
 	Stdin  = 0
 	Stdout = 1
 	Stderr = 2
 )

 const (
 	darwin64Bit = (runtime.GOOS == "darwin" || runtime.GOOS == "ios") && sizeofPtr == 8
 	netbsd32Bit = runtime.GOOS == "netbsd" && sizeofPtr == 4
 )

 // clen returns the index of the first NULL byte in n or len(n) if n contains no NULL byte.
 func clen(n []byte) int {
 	if i := bytealg.IndexByte(n, 0); i != -1 {
 		return i
 	}
 	return len(n)
 }

 // Mmap manager, for use by operating system-specific implementations.

 type mmapper struct {
 	sync.Mutex
 	active map[*byte][]byte // active mappings; key is last byte in mapping
 	mmap   func(addr, length uintptr, prot, flags, fd int, offset int64) (uintptr, error)
 	munmap func(addr uintptr, length uintptr) error
 }

 func (m *mmapper) Mmap(fd int, offset int64, length int, prot int, flags int) (data []byte, err error) {
 	if length <= 0 {
 		return nil, EINVAL
 	}

 	// Map the requested memory.
 	addr, errno := m.mmap(0, uintptr(length), prot, flags, fd, offset)
 	if errno != nil {
 		return nil, errno
 	}

 	// Use unsafe to turn addr into a []byte.
 	b := unsafe.Slice((*byte)(unsafe.Pointer(addr)), length)

 	// Register mapping in m and return it.
 	p := &b[cap(b)-1]
 	m.Lock()
 	defer m.Unlock()
 	m.active[p] = b
 	return b, nil
 }

 func (m *mmapper) Munmap(data []byte) (err error) {
 	if len(data) == 0 || len(data) != cap(data) {
 		return EINVAL
 	}

 	// Find the base of the mapping.
 	p := &data[cap(data)-1]
 	m.Lock()
 	defer m.Unlock()
 	b := m.active[p]
 	if b == nil || &b[0] != &data[0] {
 		return EINVAL
 	}

 	// Unmap the memory and update m.
 	if errno := m.munmap(uintptr(unsafe.Pointer(&b[0])), uintptr(len(b))); errno != nil {
 		return errno
 	}
 	delete(m.active, p)
 	return nil
 }

 // An Errno is an unsigned number describing an error condition.
 // It implements the error interface. The zero Errno is by convention
 // a non-error, so code to convert from Errno to error should use:
 //
 //	err = nil
 //	if errno != 0 {
 //		err = errno
 //	}
 //
 // Errno values can be tested against error values from the os package
 // using errors.Is. For example:
 //
 //	_, _, err := syscall.Syscall(...)
 //	if errors.Is(err, fs.ErrNotExist) ...
 type Errno uintptr

 func (e Errno) Error() string {
 	if 0 <= int(e) && int(e) < len(errors) {
 		s := errors[e]
 		if s != "" {
 			return s
 		}
 	}
 	return "errno " + itoa.Itoa(int(e))
 }

 func (e Errno) Is(target error) bool {
 	switch target {
 	case oserror.ErrPermission:
 		return e == EACCES || e == EPERM
 	case oserror.ErrExist:
 		return e == EEXIST || e == ENOTEMPTY
 	case oserror.ErrNotExist:
 		return e == ENOENT
 	}
 	return false
 }

 func (e Errno) Temporary() bool {
 	return e == EINTR || e == EMFILE || e == ENFILE || e.Timeout()
 }

 func (e Errno) Timeout() bool {
 	return e == EAGAIN || e == EWOULDBLOCK || e == ETIMEDOUT
 }

 // Do the interface allocations only once for common
 // Errno values.
 var (
 	errEAGAIN error = EAGAIN
 	errEINVAL error = EINVAL
 	errENOENT error = ENOENT
 )

 // errnoErr returns common boxed Errno values, to prevent
 // allocations at runtime.
 func errnoErr(e Errno) error {
 	switch e {
 	case 0:
 		return nil
 	case EAGAIN:
 		return errEAGAIN
 	case EINVAL:
 		return errEINVAL
 	case ENOENT:
 		return errENOENT
 	}
 	return e
 }

 // A Signal is a number describing a process signal.
 // It implements the os.Signal interface.
 type Signal int

 func (s Signal) Signal() {}

 func (s Signal) String() string {
 	if 0 <= s && int(s) < len(signals) {
 		str := signals[s]
 		if str != "" {
 			return str
 		}
 	}
 	return "signal " + itoa.Itoa(int(s))
 }

 func Read(fd int, p []byte) (n int, err error) {
 	n, err = read(fd, p)
 	if race.Enabled {
 		if n > 0 {
 			race.WriteRange(unsafe.Pointer(&p[0]), n)
 		}
 		if err == nil {
 			race.Acquire(unsafe.Pointer(&ioSync))
 		}
 	}
 	if msanenabled && n > 0 {
 		msanWrite(unsafe.Pointer(&p[0]), n)
 	}
 	if asanenabled && n > 0 {
 		asanWrite(unsafe.Pointer(&p[0]), n)
 	}
 	return
 }

 func Write(fd int, p []byte) (n int, err error) {
 	if race.Enabled {
 		race.ReleaseMerge(unsafe.Pointer(&ioSync))
 	}
 	if faketime && (fd == 1 || fd == 2) {
 		n = faketimeWrite(fd, p)
 		if n < 0 {
 			n, err = 0, errnoErr(Errno(-n))
 		}
 	} else {
 		n, err = write(fd, p)
 	}
 	if race.Enabled && n > 0 {
 		race.ReadRange(unsafe.Pointer(&p[0]), n)
 	}
 	if msanenabled && n > 0 {
 		msanRead(unsafe.Pointer(&p[0]), n)
 	}
 	if asanenabled && n > 0 {
 		asanRead(unsafe.Pointer(&p[0]), n)
 	}
 	return
 }

 func Pread(fd int, p []byte, offset int64) (n int, err error) {
 	n, err = pread(fd, p, offset)
 	if race.Enabled {
 		if n > 0 {
 			race.WriteRange(unsafe.Pointer(&p[0]), n)
 		}
 		if err == nil {
 			race.Acquire(unsafe.Pointer(&ioSync))
 		}
 	}
 	if msanenabled && n > 0 {
 		msanWrite(unsafe.Pointer(&p[0]), n)
 	}
 	if asanenabled && n > 0 {
 		asanWrite(unsafe.Pointer(&p[0]), n)
 	}
 	return
 }

 func Pwrite(fd int, p []byte, offset int64) (n int, err error) {
 	if race.Enabled {
 		race.ReleaseMerge(unsafe.Pointer(&ioSync))
 	}
 	n, err = pwrite(fd, p, offset)
 	if race.Enabled && n > 0 {
 		race.ReadRange(unsafe.Pointer(&p[0]), n)
 	}
 	if msanenabled && n > 0 {
 		msanRead(unsafe.Pointer(&p[0]), n)
 	}
 	if asanenabled && n > 0 {
 		asanRead(unsafe.Pointer(&p[0]), n)
 	}
 	return
 }

 // For testing: clients can set this flag to force
 // creation of IPv6 sockets to return EAFNOSUPPORT.
 var SocketDisableIPv6 bool

 type Sockaddr interface {
 	sockaddr() (ptr unsafe.Pointer, len _Socklen, err error) // lowercase; only we can define Sockaddrs
 }

 type SockaddrInet4 struct {
 	Port int
 	Addr [4]byte
 	raw  RawSockaddrInet4
 }

 type SockaddrInet6 struct {
 	Port   int
 	ZoneId uint32
 	Addr   [16]byte
 	raw    RawSockaddrInet6
 }

 type SockaddrUnix struct {
 	Name string
 	raw  RawSockaddrUnix
 }

 func Bind(fd int, sa Sockaddr) (err error) {
 	ptr, n, err := sa.sockaddr()
 	if err != nil {
 		return err
 	}
 	return bind(fd, ptr, n)
 }

 func Connect(fd int, sa Sockaddr) (err error) {
 	ptr, n, err := sa.sockaddr()
 	if err != nil {
 		return err
 	}
 	return connect(fd, ptr, n)
 }

 func Getpeername(fd int) (sa Sockaddr, err error) {
 	var rsa RawSockaddrAny
 	var len _Socklen = SizeofSockaddrAny
 	if err = getpeername(fd, &rsa, &len); err != nil {
 		return
 	}
 	return anyToSockaddr(&rsa)
 }

 func GetsockoptInt(fd, level, opt int) (value int, err error) {
 	var n int32
 	vallen := _Socklen(4)
 	err = getsockopt(fd, level, opt, unsafe.Pointer(&n), &vallen)
 	return int(n), err
 }

 func Recvfrom(fd int, p []byte, flags int) (n int, from Sockaddr, err error) {
 	var rsa RawSockaddrAny
 	var len _Socklen = SizeofSockaddrAny
 	if n, err = recvfrom(fd, p, flags, &rsa, &len); err != nil {
 		return
 	}
 	if rsa.Addr.Family != AF_UNSPEC {
 		from, err = anyToSockaddr(&rsa)
 	}
 	return
 }

 func recvfromInet4(fd int, p []byte, flags int, from *SockaddrInet4) (n int, err error) {
 	var rsa RawSockaddrAny
 	var socklen _Socklen = SizeofSockaddrAny
 	if n, err = recvfrom(fd, p, flags, &rsa, &socklen); err != nil {
 		return
 	}
 	pp := (*RawSockaddrInet4)(unsafe.Pointer(&rsa))
 	port := (*[2]byte)(unsafe.Pointer(&pp.Port))
 	from.Port = int(port[0])<<8 + int(port[1])
 	from.Addr = pp.Addr
 	return
 }

 func recvfromInet6(fd int, p []byte, flags int, from *SockaddrInet6) (n int, err error) {
 	var rsa RawSockaddrAny
 	var socklen _Socklen = SizeofSockaddrAny
 	if n, err = recvfrom(fd, p, flags, &rsa, &socklen); err != nil {
 		return
 	}
 	pp := (*RawSockaddrInet6)(unsafe.Pointer(&rsa))
 	port := (*[2]byte)(unsafe.Pointer(&pp.Port))
 	from.Port = int(port[0])<<8 + int(port[1])
 	from.ZoneId = pp.Scope_id
 	from.Addr = pp.Addr
 	return
 }

 func recvmsgInet4(fd int, p, oob []byte, flags int, from *SockaddrInet4) (n, oobn int, recvflags int, err error) {
 	var rsa RawSockaddrAny
 	n, oobn, recvflags, err = recvmsgRaw(fd, p, oob, flags, &rsa)
 	if err != nil {
 		return
 	}
 	pp := (*RawSockaddrInet4)(unsafe.Pointer(&rsa))
 	port := (*[2]byte)(unsafe.Pointer(&pp.Port))
 	from.Port = int(port[0])<<8 + int(port[1])
 	from.Addr = pp.Addr
 	return
 }

 func recvmsgInet6(fd int, p, oob []byte, flags int, from *SockaddrInet6) (n, oobn int, recvflags int, err error) {
 	var rsa RawSockaddrAny
 	n, oobn, recvflags, err = recvmsgRaw(fd, p, oob, flags, &rsa)
 	if err != nil {
 		return
 	}
 	pp := (*RawSockaddrInet6)(unsafe.Pointer(&rsa))
 	port := (*[2]byte)(unsafe.Pointer(&pp.Port))
 	from.Port = int(port[0])<<8 + int(port[1])
 	from.ZoneId = pp.Scope_id
 	from.Addr = pp.Addr
 	return
 }

 func Recvmsg(fd int, p, oob []byte, flags int) (n, oobn int, recvflags int, from Sockaddr, err error) {
 	var rsa RawSockaddrAny
 	n, oobn, recvflags, err = recvmsgRaw(fd, p, oob, flags, &rsa)
 	// source address is only specified if the socket is unconnected
 	if rsa.Addr.Family != AF_UNSPEC {
 		from, err = anyToSockaddr(&rsa)
 	}
 	return
 }

 func Sendmsg(fd int, p, oob []byte, to Sockaddr, flags int) (err error) {
 	_, err = SendmsgN(fd, p, oob, to, flags)
 	return
 }

 func SendmsgN(fd int, p, oob []byte, to Sockaddr, flags int) (n int, err error) {
 	var ptr unsafe.Pointer
 	var salen _Socklen
 	if to != nil {
 		ptr, salen, err = to.sockaddr()
 		if err != nil {
 			return 0, err
 		}
 	}
 	return sendmsgN(fd, p, oob, ptr, salen, flags)
 }

 func sendmsgNInet4(fd int, p, oob []byte, to *SockaddrInet4, flags int) (n int, err error) {
 	ptr, salen, err := to.sockaddr()
 	if err != nil {
 		return 0, err
 	}
 	return sendmsgN(fd, p, oob, ptr, salen, flags)
 }

 func sendmsgNInet6(fd int, p, oob []byte, to *SockaddrInet6, flags int) (n int, err error) {
 	ptr, salen, err := to.sockaddr()
 	if err != nil {
 		return 0, err
 	}
 	return sendmsgN(fd, p, oob, ptr, salen, flags)
 }

 func sendtoInet4(fd int, p []byte, flags int, to *SockaddrInet4) (err error) {
 	ptr, n, err := to.sockaddr()
 	if err != nil {
 		return err
 	}
 	return sendto(fd, p, flags, ptr, n)
 }

 func sendtoInet6(fd int, p []byte, flags int, to *SockaddrInet6) (err error) {
 	ptr, n, err := to.sockaddr()
 	if err != nil {
 		return err
 	}
 	return sendto(fd, p, flags, ptr, n)
 }

 func Sendto(fd int, p []byte, flags int, to Sockaddr) (err error) {
 	var (
 		ptr   unsafe.Pointer
 		salen _Socklen
 	)
 	if to != nil {
 		ptr, salen, err = to.sockaddr()
 		if err != nil {
 			return err
 		}
 	}
 	return sendto(fd, p, flags, ptr, salen)
 }

 func SetsockoptByte(fd, level, opt int, value byte) (err error) {
 	return setsockopt(fd, level, opt, unsafe.Pointer(&value), 1)
 }

 func SetsockoptInt(fd, level, opt int, value int) (err error) {
 	var n = int32(value)
 	return setsockopt(fd, level, opt, unsafe.Pointer(&n), 4)
 }

 func SetsockoptInet4Addr(fd, level, opt int, value [4]byte) (err error) {
 	return setsockopt(fd, level, opt, unsafe.Pointer(&value[0]), 4)
 }

 func SetsockoptIPMreq(fd, level, opt int, mreq *IPMreq) (err error) {
 	return setsockopt(fd, level, opt, unsafe.Pointer(mreq), SizeofIPMreq)
 }

 func SetsockoptIPv6Mreq(fd, level, opt int, mreq *IPv6Mreq) (err error) {
 	return setsockopt(fd, level, opt, unsafe.Pointer(mreq), SizeofIPv6Mreq)
 }

 func SetsockoptICMPv6Filter(fd, level, opt int, filter *ICMPv6Filter) error {
 	return setsockopt(fd, level, opt, unsafe.Pointer(filter), SizeofICMPv6Filter)
 }

 func SetsockoptLinger(fd, level, opt int, l *Linger) (err error) {
 	return setsockopt(fd, level, opt, unsafe.Pointer(l), SizeofLinger)
 }

 func SetsockoptString(fd, level, opt int, s string) (err error) {
 	var p unsafe.Pointer
 	if len(s) > 0 {
 		p = unsafe.Pointer(&[]byte(s)[0])
 	}
 	return setsockopt(fd, level, opt, p, uintptr(len(s)))
 }

 func SetsockoptTimeval(fd, level, opt int, tv *Timeval) (err error) {
 	return setsockopt(fd, level, opt, unsafe.Pointer(tv), unsafe.Sizeof(*tv))
 }

 func Socket(domain, typ, proto int) (fd int, err error) {
 	if domain == AF_INET6 && SocketDisableIPv6 {
 		return -1, EAFNOSUPPORT
 	}
 	fd, err = socket(domain, typ, proto)
 	return
 }

 func Socketpair(domain, typ, proto int) (fd [2]int, err error) {
 	var fdx [2]int32
 	err = socketpair(domain, typ, proto, &fdx)
 	if err == nil {
 		fd[0] = int(fdx[0])
 		fd[1] = int(fdx[1])
 	}
 	return
 }

 func Sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) {
 	if race.Enabled {
 		race.ReleaseMerge(unsafe.Pointer(&ioSync))
 	}
 	return sendfile(outfd, infd, offset, count)
 }

 var ioSync int64
	// Copyright 2009 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.

	//go:build unix

	package syscall

	import (
	"internal/bytealg"
	"internal/itoa"
	"internal/oserror"
	"internal/race"
	"runtime"
	"sync"
	"unsafe"
	)

	var (
	Stdin = 0
	Stdout = 1
	Stderr = 2
	)

	const (
	darwin64Bit = (runtime.GOOS == "darwin" \|\| runtime.GOOS == "ios") && sizeofPtr == 8
	netbsd32Bit = runtime.GOOS == "netbsd" && sizeofPtr == 4
	)

	// clen returns the index of the first NULL byte in n or len(n) if n contains no NULL byte.
	func clen(n []byte) int {
	if i := bytealg.IndexByte(n, 0); i != -1 {
	return i
	}
	return len(n)
	}

	// Mmap manager, for use by operating system-specific implementations.

	type mmapper struct {
	sync.Mutex
	active map[*byte][]byte // active mappings; key is last byte in mapping
	mmap func(addr, length uintptr, prot, flags, fd int, offset int64) (uintptr, error)
	munmap func(addr uintptr, length uintptr) error
	}

	func (m *mmapper) Mmap(fd int, offset int64, length int, prot int, flags int) (data []byte, err error) {
	if length <= 0 {
	return nil, EINVAL
	}

	// Map the requested memory.
	addr, errno := m.mmap(0, uintptr(length), prot, flags, fd, offset)
	if errno != nil {
	return nil, errno
	}

	// Use unsafe to turn addr into a []byte.
	b := unsafe.Slice((*byte)(unsafe.Pointer(addr)), length)

	// Register mapping in m and return it.
	p := &b[cap(b)-1]
	m.Lock()
	defer m.Unlock()
	m.active[p] = b
	return b, nil
	}

	func (m *mmapper) Munmap(data []byte) (err error) {
	if len(data) == 0 \|\| len(data) != cap(data) {
	return EINVAL
	}

	// Find the base of the mapping.
	p := &data[cap(data)-1]
	m.Lock()
	defer m.Unlock()
	b := m.active[p]
	if b == nil \|\| &b[0] != &data[0] {
	return EINVAL
	}

	// Unmap the memory and update m.
	if errno := m.munmap(uintptr(unsafe.Pointer(&b[0])), uintptr(len(b))); errno != nil {
	return errno
	}
	delete(m.active, p)
	return nil
	}

	// An Errno is an unsigned number describing an error condition.
	// It implements the error interface. The zero Errno is by convention
	// a non-error, so code to convert from Errno to error should use:
	//
	// err = nil
	// if errno != 0 {
	// err = errno
	// }
	//
	// Errno values can be tested against error values from the os package
	// using errors.Is. For example:
	//
	// _, _, err := syscall.Syscall(...)
	// if errors.Is(err, fs.ErrNotExist) ...
	type Errno uintptr

	func (e Errno) Error() string {
	if 0 <= int(e) && int(e) < len(errors) {
	s := errors[e]
	if s != "" {
	return s
	}
	}
	return "errno " + itoa.Itoa(int(e))
	}

	func (e Errno) Is(target error) bool {
	switch target {
	case oserror.ErrPermission:
	return e == EACCES \|\| e == EPERM
	case oserror.ErrExist:
	return e == EEXIST \|\| e == ENOTEMPTY
	case oserror.ErrNotExist:
	return e == ENOENT
	}
	return false
	}

	func (e Errno) Temporary() bool {
	return e == EINTR \|\| e == EMFILE \|\| e == ENFILE \|\| e.Timeout()
	}

	func (e Errno) Timeout() bool {
	return e == EAGAIN \|\| e == EWOULDBLOCK \|\| e == ETIMEDOUT
	}

	// Do the interface allocations only once for common
	// Errno values.
	var (
	errEAGAIN error = EAGAIN
	errEINVAL error = EINVAL
	errENOENT error = ENOENT
	)

	// errnoErr returns common boxed Errno values, to prevent
	// allocations at runtime.
	func errnoErr(e Errno) error {
	switch e {
	case 0:
	return nil
	case EAGAIN:
	return errEAGAIN
	case EINVAL:
	return errEINVAL
	case ENOENT:
	return errENOENT
	}
	return e
	}

	// A Signal is a number describing a process signal.
	// It implements the os.Signal interface.
	type Signal int

	func (s Signal) Signal() {}

	func (s Signal) String() string {
	if 0 <= s && int(s) < len(signals) {
	str := signals[s]
	if str != "" {
	return str
	}
	}
	return "signal " + itoa.Itoa(int(s))
	}

	func Read(fd int, p []byte) (n int, err error) {
	n, err = read(fd, p)
	if race.Enabled {
	if n > 0 {
	race.WriteRange(unsafe.Pointer(&p[0]), n)
	}
	if err == nil {
	race.Acquire(unsafe.Pointer(&ioSync))
	}
	}
	if msanenabled && n > 0 {
	msanWrite(unsafe.Pointer(&p[0]), n)
	}
	if asanenabled && n > 0 {
	asanWrite(unsafe.Pointer(&p[0]), n)
	}
	return
	}

	func Write(fd int, p []byte) (n int, err error) {
	if race.Enabled {
	race.ReleaseMerge(unsafe.Pointer(&ioSync))
	}
	if faketime && (fd == 1 \|\| fd == 2) {
	n = faketimeWrite(fd, p)
	if n < 0 {
	n, err = 0, errnoErr(Errno(-n))
	}
	} else {
	n, err = write(fd, p)
	}
	if race.Enabled && n > 0 {
	race.ReadRange(unsafe.Pointer(&p[0]), n)
	}
	if msanenabled && n > 0 {
	msanRead(unsafe.Pointer(&p[0]), n)
	}
	if asanenabled && n > 0 {
	asanRead(unsafe.Pointer(&p[0]), n)
	}
	return
	}

	func Pread(fd int, p []byte, offset int64) (n int, err error) {
	n, err = pread(fd, p, offset)
	if race.Enabled {
	if n > 0 {
	race.WriteRange(unsafe.Pointer(&p[0]), n)
	}
	if err == nil {
	race.Acquire(unsafe.Pointer(&ioSync))
	}
	}
	if msanenabled && n > 0 {
	msanWrite(unsafe.Pointer(&p[0]), n)
	}
	if asanenabled && n > 0 {
	asanWrite(unsafe.Pointer(&p[0]), n)
	}
	return
	}

	func Pwrite(fd int, p []byte, offset int64) (n int, err error) {
	if race.Enabled {
	race.ReleaseMerge(unsafe.Pointer(&ioSync))
	}
	n, err = pwrite(fd, p, offset)
	if race.Enabled && n > 0 {
	race.ReadRange(unsafe.Pointer(&p[0]), n)
	}
	if msanenabled && n > 0 {
	msanRead(unsafe.Pointer(&p[0]), n)
	}
	if asanenabled && n > 0 {
	asanRead(unsafe.Pointer(&p[0]), n)
	}
	return
	}

	// For testing: clients can set this flag to force
	// creation of IPv6 sockets to return EAFNOSUPPORT.
	var SocketDisableIPv6 bool

	type Sockaddr interface {
	sockaddr() (ptr unsafe.Pointer, len _Socklen, err error) // lowercase; only we can define Sockaddrs
	}

	type SockaddrInet4 struct {
	Port int
	Addr [4]byte
	raw RawSockaddrInet4
	}

	type SockaddrInet6 struct {
	Port int
	ZoneId uint32
	Addr [16]byte
	raw RawSockaddrInet6
	}

	type SockaddrUnix struct {
	Name string
	raw RawSockaddrUnix
	}

	func Bind(fd int, sa Sockaddr) (err error) {
	ptr, n, err := sa.sockaddr()
	if err != nil {
	return err
	}
	return bind(fd, ptr, n)
	}

	func Connect(fd int, sa Sockaddr) (err error) {
	ptr, n, err := sa.sockaddr()
	if err != nil {
	return err
	}
	return connect(fd, ptr, n)
	}

	func Getpeername(fd int) (sa Sockaddr, err error) {
	var rsa RawSockaddrAny
	var len _Socklen = SizeofSockaddrAny
	if err = getpeername(fd, &rsa, &len); err != nil {
	return
	}
	return anyToSockaddr(&rsa)
	}

	func GetsockoptInt(fd, level, opt int) (value int, err error) {
	var n int32
	vallen := _Socklen(4)
	err = getsockopt(fd, level, opt, unsafe.Pointer(&n), &vallen)
	return int(n), err
	}

	func Recvfrom(fd int, p []byte, flags int) (n int, from Sockaddr, err error) {
	var rsa RawSockaddrAny
	var len _Socklen = SizeofSockaddrAny
	if n, err = recvfrom(fd, p, flags, &rsa, &len); err != nil {
	return
	}
	if rsa.Addr.Family != AF_UNSPEC {
	from, err = anyToSockaddr(&rsa)
	}
	return
	}

	func recvfromInet4(fd int, p []byte, flags int, from *SockaddrInet4) (n int, err error) {
	var rsa RawSockaddrAny
	var socklen _Socklen = SizeofSockaddrAny
	if n, err = recvfrom(fd, p, flags, &rsa, &socklen); err != nil {
	return
	}
	pp := (*RawSockaddrInet4)(unsafe.Pointer(&rsa))
	port := (*[2]byte)(unsafe.Pointer(&pp.Port))
	from.Port = int(port[0])<<8 + int(port[1])
	from.Addr = pp.Addr
	return
	}

	func recvfromInet6(fd int, p []byte, flags int, from *SockaddrInet6) (n int, err error) {
	var rsa RawSockaddrAny
	var socklen _Socklen = SizeofSockaddrAny
	if n, err = recvfrom(fd, p, flags, &rsa, &socklen); err != nil {
	return
	}
	pp := (*RawSockaddrInet6)(unsafe.Pointer(&rsa))
	port := (*[2]byte)(unsafe.Pointer(&pp.Port))
	from.Port = int(port[0])<<8 + int(port[1])
	from.ZoneId = pp.Scope_id
	from.Addr = pp.Addr
	return
	}

	func recvmsgInet4(fd int, p, oob []byte, flags int, from *SockaddrInet4) (n, oobn int, recvflags int, err error) {
	var rsa RawSockaddrAny
	n, oobn, recvflags, err = recvmsgRaw(fd, p, oob, flags, &rsa)
	if err != nil {
	return
	}
	pp := (*RawSockaddrInet4)(unsafe.Pointer(&rsa))
	port := (*[2]byte)(unsafe.Pointer(&pp.Port))
	from.Port = int(port[0])<<8 + int(port[1])
	from.Addr = pp.Addr
	return
	}

	func recvmsgInet6(fd int, p, oob []byte, flags int, from *SockaddrInet6) (n, oobn int, recvflags int, err error) {
	var rsa RawSockaddrAny
	n, oobn, recvflags, err = recvmsgRaw(fd, p, oob, flags, &rsa)
	if err != nil {
	return
	}
	pp := (*RawSockaddrInet6)(unsafe.Pointer(&rsa))
	port := (*[2]byte)(unsafe.Pointer(&pp.Port))
	from.Port = int(port[0])<<8 + int(port[1])
	from.ZoneId = pp.Scope_id
	from.Addr = pp.Addr
	return
	}

	func Recvmsg(fd int, p, oob []byte, flags int) (n, oobn int, recvflags int, from Sockaddr, err error) {
	var rsa RawSockaddrAny
	n, oobn, recvflags, err = recvmsgRaw(fd, p, oob, flags, &rsa)
	// source address is only specified if the socket is unconnected
	if rsa.Addr.Family != AF_UNSPEC {
	from, err = anyToSockaddr(&rsa)
	}
	return
	}

	func Sendmsg(fd int, p, oob []byte, to Sockaddr, flags int) (err error) {
	_, err = SendmsgN(fd, p, oob, to, flags)
	return
	}

	func SendmsgN(fd int, p, oob []byte, to Sockaddr, flags int) (n int, err error) {
	var ptr unsafe.Pointer
	var salen _Socklen
	if to != nil {
	ptr, salen, err = to.sockaddr()
	if err != nil {
	return 0, err
	}
	}
	return sendmsgN(fd, p, oob, ptr, salen, flags)
	}

	func sendmsgNInet4(fd int, p, oob []byte, to *SockaddrInet4, flags int) (n int, err error) {
	ptr, salen, err := to.sockaddr()
	if err != nil {
	return 0, err
	}
	return sendmsgN(fd, p, oob, ptr, salen, flags)
	}

	func sendmsgNInet6(fd int, p, oob []byte, to *SockaddrInet6, flags int) (n int, err error) {
	ptr, salen, err := to.sockaddr()
	if err != nil {
	return 0, err
	}
	return sendmsgN(fd, p, oob, ptr, salen, flags)
	}

	func sendtoInet4(fd int, p []byte, flags int, to *SockaddrInet4) (err error) {
	ptr, n, err := to.sockaddr()
	if err != nil {
	return err
	}
	return sendto(fd, p, flags, ptr, n)
	}

	func sendtoInet6(fd int, p []byte, flags int, to *SockaddrInet6) (err error) {
	ptr, n, err := to.sockaddr()
	if err != nil {
	return err
	}
	return sendto(fd, p, flags, ptr, n)
	}

	func Sendto(fd int, p []byte, flags int, to Sockaddr) (err error) {
	var (
	ptr unsafe.Pointer
	salen _Socklen
	)
	if to != nil {
	ptr, salen, err = to.sockaddr()
	if err != nil {
	return err
	}
	}
	return sendto(fd, p, flags, ptr, salen)
	}

	func SetsockoptByte(fd, level, opt int, value byte) (err error) {
	return setsockopt(fd, level, opt, unsafe.Pointer(&value), 1)
	}

	func SetsockoptInt(fd, level, opt int, value int) (err error) {
	var n = int32(value)
	return setsockopt(fd, level, opt, unsafe.Pointer(&n), 4)
	}

	func SetsockoptInet4Addr(fd, level, opt int, value [4]byte) (err error) {
	return setsockopt(fd, level, opt, unsafe.Pointer(&value[0]), 4)
	}

	func SetsockoptIPMreq(fd, level, opt int, mreq *IPMreq) (err error) {
	return setsockopt(fd, level, opt, unsafe.Pointer(mreq), SizeofIPMreq)
	}

	func SetsockoptIPv6Mreq(fd, level, opt int, mreq *IPv6Mreq) (err error) {
	return setsockopt(fd, level, opt, unsafe.Pointer(mreq), SizeofIPv6Mreq)
	}

	func SetsockoptICMPv6Filter(fd, level, opt int, filter *ICMPv6Filter) error {
	return setsockopt(fd, level, opt, unsafe.Pointer(filter), SizeofICMPv6Filter)
	}

	func SetsockoptLinger(fd, level, opt int, l *Linger) (err error) {
	return setsockopt(fd, level, opt, unsafe.Pointer(l), SizeofLinger)
	}

	func SetsockoptString(fd, level, opt int, s string) (err error) {
	var p unsafe.Pointer
	if len(s) > 0 {
	p = unsafe.Pointer(&[]byte(s)[0])
	}
	return setsockopt(fd, level, opt, p, uintptr(len(s)))
	}

	func SetsockoptTimeval(fd, level, opt int, tv *Timeval) (err error) {
	return setsockopt(fd, level, opt, unsafe.Pointer(tv), unsafe.Sizeof(*tv))
	}

	func Socket(domain, typ, proto int) (fd int, err error) {
	if domain == AF_INET6 && SocketDisableIPv6 {
	return -1, EAFNOSUPPORT
	}
	fd, err = socket(domain, typ, proto)
	return
	}

	func Socketpair(domain, typ, proto int) (fd [2]int, err error) {
	var fdx [2]int32
	err = socketpair(domain, typ, proto, &fdx)
	if err == nil {
	fd[0] = int(fdx[0])
	fd[1] = int(fdx[1])
	}
	return
	}

	func Sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) {
	if race.Enabled {
	race.ReleaseMerge(unsafe.Pointer(&ioSync))
	}
	return sendfile(outfd, infd, offset, count)
	}

	var ioSync int64