mirror of
https://github.com/golang/go
synced 2024-10-04 14:21:21 -06:00
e3e48cd075
Also exposes common socket option functions on Solaris. Update #7174 Update #7175 LGTM=aram R=golang-codereviews, aram CC=golang-codereviews https://golang.org/cl/107280044
342 lines
8.0 KiB
Go
342 lines
8.0 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 syscall
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import (
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"runtime"
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"sync"
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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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)
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func Syscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno)
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func Syscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno)
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func RawSyscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno)
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func RawSyscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno)
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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 unsafeto 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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// An Errno is an unsigned number describing an error condition.
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// It implements the error interface. The zero Errno is by convention
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// a non-error, so code to convert from Errno to error should use:
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// err = nil
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// if errno != 0 {
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// err = errno
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// }
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type Errno uintptr
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func (e Errno) Error() string {
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if 0 <= int(e) && int(e) < len(errors) {
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s := errors[e]
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if s != "" {
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return s
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}
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}
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return "errno " + itoa(int(e))
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}
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func (e Errno) Temporary() bool {
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return e == EINTR || e == EMFILE || e.Timeout()
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}
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func (e Errno) Timeout() bool {
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return e == EAGAIN || e == EWOULDBLOCK || e == ETIMEDOUT
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}
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// A Signal is a number describing a process signal.
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// It implements the os.Signal interface.
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type Signal int
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func (s Signal) Signal() {}
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func (s Signal) String() string {
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if 0 <= s && int(s) < len(signals) {
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str := signals[s]
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if str != "" {
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return str
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}
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}
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return "signal " + itoa(int(s))
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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 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 GetsockoptByte(fd, level, opt int) (byte, error) {
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var v byte
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l := _Socklen(1)
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err := getsockopt(fd, level, opt, unsafe.Pointer(&v), &l)
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return v, err
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}
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func GetsockoptInt(fd, level, opt int) (int, error) {
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var v int32
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l := _Socklen(4)
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err := getsockopt(fd, level, opt, unsafe.Pointer(&v), &l)
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return int(v), err
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}
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func GetsockoptInet4Addr(fd, level, opt int) ([4]byte, error) {
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var v [4]byte
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l := _Socklen(4)
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err := getsockopt(fd, level, opt, unsafe.Pointer(&v[0]), &l)
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return v, err
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}
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func GetsockoptIPMreq(fd, level, opt int) (*IPMreq, error) {
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var v IPMreq
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l := _Socklen(SizeofIPMreq)
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err := getsockopt(fd, level, opt, unsafe.Pointer(&v), &l)
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return &v, err
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}
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func GetsockoptIPv6Mreq(fd, level, opt int) (*IPv6Mreq, error) {
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var v IPv6Mreq
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l := _Socklen(SizeofIPv6Mreq)
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err := getsockopt(fd, level, opt, unsafe.Pointer(&v), &l)
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return &v, err
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}
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func GetsockoptIPv6MTUInfo(fd, level, opt int) (*IPv6MTUInfo, error) {
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var v IPv6MTUInfo
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l := _Socklen(SizeofIPv6MTUInfo)
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err := getsockopt(fd, level, opt, unsafe.Pointer(&v), &l)
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return &v, err
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}
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func GetsockoptICMPv6Filter(fd, level, opt int) (*ICMPv6Filter, error) {
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var v ICMPv6Filter
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l := _Socklen(SizeofICMPv6Filter)
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err := getsockopt(fd, level, opt, unsafe.Pointer(&v), &l)
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return &v, err
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}
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func SetsockoptByte(fd, level, opt int, value byte) 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) error {
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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) 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) 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) 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) 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) 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) 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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