88 lines
1.7 KiB
Go
88 lines
1.7 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 freebsd linux netbsd openbsd windows
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// Sockets
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package net
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import (
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"io"
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"syscall"
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)
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var listenerBacklog = maxListenerBacklog()
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// Generic socket creation.
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func socket(net string, f, t, p int, la, ra syscall.Sockaddr, toAddr func(syscall.Sockaddr) Addr) (fd *netFD, err error) {
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// See ../syscall/exec.go for description of ForkLock.
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syscall.ForkLock.RLock()
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s, err := syscall.Socket(f, t, p)
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if err != nil {
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syscall.ForkLock.RUnlock()
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return nil, err
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}
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syscall.CloseOnExec(s)
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syscall.ForkLock.RUnlock()
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err = setDefaultSockopts(s, f, t)
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if err != nil {
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closesocket(s)
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return nil, err
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}
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var bla syscall.Sockaddr
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if la != nil {
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bla, err = listenerSockaddr(s, f, la, toAddr)
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if err != nil {
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closesocket(s)
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return nil, err
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}
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err = syscall.Bind(s, bla)
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if err != nil {
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closesocket(s)
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return nil, err
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}
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}
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if fd, err = newFD(s, f, t, net); err != nil {
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closesocket(s)
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return nil, err
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}
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if ra != nil {
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if err = fd.connect(ra); err != nil {
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closesocket(s)
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fd.Close()
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return nil, err
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}
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fd.isConnected = true
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}
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sa, _ := syscall.Getsockname(s)
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var laddr Addr
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if la != nil && bla != la {
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laddr = toAddr(la)
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} else {
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laddr = toAddr(sa)
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}
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sa, _ = syscall.Getpeername(s)
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raddr := toAddr(sa)
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fd.setAddr(laddr, raddr)
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return fd, nil
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}
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type writerOnly struct {
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io.Writer
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}
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// Fallback implementation of io.ReaderFrom's ReadFrom, when sendfile isn't
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// applicable.
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func genericReadFrom(w io.Writer, r io.Reader) (n int64, err error) {
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// Use wrapper to hide existing r.ReadFrom from io.Copy.
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return io.Copy(writerOnly{w}, r)
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}
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