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addrselect.go
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conn_test.go
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dial.go
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dial_test.go
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dial_unix_test.go
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dnsclient.go
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dnsclient_test.go
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dnsclient_unix.go
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dnsclient_unix_test.go
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dnsconfig_unix.go
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dnsname_test.go
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example_test.go
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external_test.go
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fd_plan9.go
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hosts.go
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interface.go
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ip.go
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iprawsock.go
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listen_test.go
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lookup.go
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lookup_test.go
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lookup_unix.go
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lookup_windows.go
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lookup_windows_test.go
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mac.go
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mac_test.go
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main_cloexec_test.go
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main_conf_test.go
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mockserver_test.go
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net.go
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net_fake.go
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net_test.go
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packetconn_test.go
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parse.go
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parse_test.go
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pipe.go
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pipe_test.go
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platform_test.go
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port.go
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protoconn_test.go
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rawconn.go
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rawconn_stub_test.go
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rawconn_test.go
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sendfile_linux.go
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sendfile_stub.go
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sendfile_test.go
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sendfile_windows.go
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server_test.go
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sock_bsd.go
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sock_cloexec.go
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sock_linux.go
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sock_windows.go
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splice_stub.go
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splice_test.go
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sys_cloexec.go
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tcpsock.go
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Code Editor : fd_windows.go
// Copyright 2010 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 net import ( "context" "internal/poll" "os" "runtime" "syscall" "time" "unsafe" ) // canUseConnectEx reports whether we can use the ConnectEx Windows API call // for the given network type. func canUseConnectEx(net string) bool { switch net { case "tcp", "tcp4", "tcp6": return true } // ConnectEx windows API does not support connectionless sockets. return false } // Network file descriptor. type netFD struct { pfd poll.FD // immutable until Close family int sotype int isConnected bool // handshake completed or use of association with peer net string laddr Addr raddr Addr } func newFD(sysfd syscall.Handle, family, sotype int, net string) (*netFD, error) { ret := &netFD{ pfd: poll.FD{ Sysfd: sysfd, IsStream: sotype == syscall.SOCK_STREAM, ZeroReadIsEOF: sotype != syscall.SOCK_DGRAM && sotype != syscall.SOCK_RAW, }, family: family, sotype: sotype, net: net, } return ret, nil } func (fd *netFD) init() error { errcall, err := fd.pfd.Init(fd.net, true) if errcall != "" { err = wrapSyscallError(errcall, err) } return err } func (fd *netFD) setAddr(laddr, raddr Addr) { fd.laddr = laddr fd.raddr = raddr runtime.SetFinalizer(fd, (*netFD).Close) } // Always returns nil for connected peer address result. func (fd *netFD) connect(ctx context.Context, la, ra syscall.Sockaddr) (syscall.Sockaddr, error) { // Do not need to call fd.writeLock here, // because fd is not yet accessible to user, // so no concurrent operations are possible. if err := fd.init(); err != nil { return nil, err } if deadline, ok := ctx.Deadline(); ok && !deadline.IsZero() { fd.pfd.SetWriteDeadline(deadline) defer fd.pfd.SetWriteDeadline(noDeadline) } if !canUseConnectEx(fd.net) { err := connectFunc(fd.pfd.Sysfd, ra) return nil, os.NewSyscallError("connect", err) } // ConnectEx windows API requires an unconnected, previously bound socket. if la == nil { switch ra.(type) { case *syscall.SockaddrInet4: la = &syscall.SockaddrInet4{} case *syscall.SockaddrInet6: la = &syscall.SockaddrInet6{} default: panic("unexpected type in connect") } if err := syscall.Bind(fd.pfd.Sysfd, la); err != nil { return nil, os.NewSyscallError("bind", err) } } // Wait for the goroutine converting context.Done into a write timeout // to exist, otherwise our caller might cancel the context and // cause fd.setWriteDeadline(aLongTimeAgo) to cancel a successful dial. done := make(chan bool) // must be unbuffered defer func() { done <- true }() go func() { select { case <-ctx.Done(): // Force the runtime's poller to immediately give // up waiting for writability. fd.pfd.SetWriteDeadline(aLongTimeAgo) <-done case <-done: } }() // Call ConnectEx API. if err := fd.pfd.ConnectEx(ra); err != nil { select { case <-ctx.Done(): return nil, mapErr(ctx.Err()) default: if _, ok := err.(syscall.Errno); ok { err = os.NewSyscallError("connectex", err) } return nil, err } } // Refresh socket properties. return nil, os.NewSyscallError("setsockopt", syscall.Setsockopt(fd.pfd.Sysfd, syscall.SOL_SOCKET, syscall.SO_UPDATE_CONNECT_CONTEXT, (*byte)(unsafe.Pointer(&fd.pfd.Sysfd)), int32(unsafe.Sizeof(fd.pfd.Sysfd)))) } func (fd *netFD) Close() error { runtime.SetFinalizer(fd, nil) return fd.pfd.Close() } func (fd *netFD) shutdown(how int) error { err := fd.pfd.Shutdown(how) runtime.KeepAlive(fd) return err } func (fd *netFD) closeRead() error { return fd.shutdown(syscall.SHUT_RD) } func (fd *netFD) closeWrite() error { return fd.shutdown(syscall.SHUT_WR) } func (fd *netFD) Read(buf []byte) (int, error) { n, err := fd.pfd.Read(buf) runtime.KeepAlive(fd) return n, wrapSyscallError("wsarecv", err) } func (fd *netFD) readFrom(buf []byte) (int, syscall.Sockaddr, error) { n, sa, err := fd.pfd.ReadFrom(buf) runtime.KeepAlive(fd) return n, sa, wrapSyscallError("wsarecvfrom", err) } func (fd *netFD) Write(buf []byte) (int, error) { n, err := fd.pfd.Write(buf) runtime.KeepAlive(fd) return n, wrapSyscallError("wsasend", err) } func (c *conn) writeBuffers(v *Buffers) (int64, error) { if !c.ok() { return 0, syscall.EINVAL } n, err := c.fd.writeBuffers(v) if err != nil { return n, &OpError{Op: "wsasend", Net: c.fd.net, Source: c.fd.laddr, Addr: c.fd.raddr, Err: err} } return n, nil } func (fd *netFD) writeBuffers(buf *Buffers) (int64, error) { n, err := fd.pfd.Writev((*[][]byte)(buf)) runtime.KeepAlive(fd) return n, wrapSyscallError("wsasend", err) } func (fd *netFD) writeTo(buf []byte, sa syscall.Sockaddr) (int, error) { n, err := fd.pfd.WriteTo(buf, sa) runtime.KeepAlive(fd) return n, wrapSyscallError("wsasendto", err) } func (fd *netFD) accept() (*netFD, error) { s, rawsa, rsan, errcall, err := fd.pfd.Accept(func() (syscall.Handle, error) { return sysSocket(fd.family, fd.sotype, 0) }) if err != nil { if errcall != "" { err = wrapSyscallError(errcall, err) } return nil, err } // Associate our new socket with IOCP. netfd, err := newFD(s, fd.family, fd.sotype, fd.net) if err != nil { poll.CloseFunc(s) return nil, err } if err := netfd.init(); err != nil { fd.Close() return nil, err } // Get local and peer addr out of AcceptEx buffer. var lrsa, rrsa *syscall.RawSockaddrAny var llen, rlen int32 syscall.GetAcceptExSockaddrs((*byte)(unsafe.Pointer(&rawsa[0])), 0, rsan, rsan, &lrsa, &llen, &rrsa, &rlen) lsa, _ := lrsa.Sockaddr() rsa, _ := rrsa.Sockaddr() netfd.setAddr(netfd.addrFunc()(lsa), netfd.addrFunc()(rsa)) return netfd, nil } func (fd *netFD) readMsg(p []byte, oob []byte) (n, oobn, flags int, sa syscall.Sockaddr, err error) { n, oobn, flags, sa, err = fd.pfd.ReadMsg(p, oob) runtime.KeepAlive(fd) return n, oobn, flags, sa, wrapSyscallError("wsarecvmsg", err) } func (fd *netFD) writeMsg(p []byte, oob []byte, sa syscall.Sockaddr) (n int, oobn int, err error) { n, oobn, err = fd.pfd.WriteMsg(p, oob, sa) runtime.KeepAlive(fd) return n, oobn, wrapSyscallError("wsasendmsg", err) } // Unimplemented functions. func (fd *netFD) dup() (*os.File, error) { // TODO: Implement this return nil, syscall.EWINDOWS } func (fd *netFD) SetDeadline(t time.Time) error { return fd.pfd.SetDeadline(t) } func (fd *netFD) SetReadDeadline(t time.Time) error { return fd.pfd.SetReadDeadline(t) } func (fd *netFD) SetWriteDeadline(t time.Time) error { return fd.pfd.SetWriteDeadline(t) }
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