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// 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.

// +build darwin freebsd linux netbsd openbsd windows

// Sockets

package net

import (
        "io"
        "syscall"
)

var listenerBacklog = maxListenerBacklog()

// Generic socket creation.
func socket(net string, f, t, p int, la, ra syscall.Sockaddr, toAddr func(syscall.Sockaddr) Addr) (fd *netFD, err error) {
        // See ../syscall/exec.go for description of ForkLock.
        syscall.ForkLock.RLock()
        s, err := syscall.Socket(f, t, p)
        if err != nil {
                syscall.ForkLock.RUnlock()
                return nil, err
        }
        syscall.CloseOnExec(s)
        syscall.ForkLock.RUnlock()

        err = setDefaultSockopts(s, f, t)
        if err != nil {
                closesocket(s)
                return nil, err
        }

        if la != nil {
                la, err = listenerSockaddr(s, f, la, toAddr)
                if err != nil {
                        closesocket(s)
                        return nil, err
                }
                err = syscall.Bind(s, la)
                if err != nil {
                        closesocket(s)
                        return nil, err
                }
        }

        if fd, err = newFD(s, f, t, net); err != nil {
                closesocket(s)
                return nil, err
        }

        if ra != nil {
                if err = fd.connect(ra); err != nil {
                        closesocket(s)
                        fd.Close()
                        return nil, err
                }
                fd.isConnected = true
        }

        sa, _ := syscall.Getsockname(s)
        laddr := toAddr(sa)
        sa, _ = syscall.Getpeername(s)
        raddr := toAddr(sa)

        fd.setAddr(laddr, raddr)
        return fd, nil
}

type writerOnly struct {
        io.Writer
}

// Fallback implementation of io.ReaderFrom's ReadFrom, when sendfile isn't
// applicable.
func genericReadFrom(w io.Writer, r io.Reader) (n int64, err error) {
        // Use wrapper to hide existing r.ReadFrom from io.Copy.
        return io.Copy(writerOnly{w}, r)
}