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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.
// Sockets
package net
import (
"io"
"os"
"reflect"
"syscall"
)
// Boolean to int.
func boolint(b bool) int {
if b {
return 1
}
return 0
}
// Generic socket creation.
func socket(net string, f, p, t int, la, ra syscall.Sockaddr, toAddr func(syscall.Sockaddr) Addr) (fd *netFD, err os.Error) {
// See ../syscall/exec.go for description of ForkLock.
syscall.ForkLock.RLock()
s, e := syscall.Socket(f, p, t)
if e != 0 {
syscall.ForkLock.RUnlock()
return nil, os.Errno(e)
}
syscall.CloseOnExec(s)
syscall.ForkLock.RUnlock()
setKernelSpecificSockopt(s, f)
if la != nil {
e = syscall.Bind(s, la)
if e != 0 {
closesocket(s)
return nil, os.Errno(e)
}
}
if fd, err = newFD(s, f, p, net); err != nil {
closesocket(s)
return nil, err
}
if ra != nil {
if err = fd.connect(ra); err != nil {
fd.Close()
return nil, err
}
}
sa, _ := syscall.Getsockname(s)
laddr := toAddr(sa)
sa, _ = syscall.Getpeername(s)
raddr := toAddr(sa)
fd.setAddr(laddr, raddr)
return fd, nil
}
func setsockoptInt(fd *netFD, level, opt int, value int) os.Error {
return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(fd.sysfd, level, opt, value))
}
func setsockoptNsec(fd *netFD, level, opt int, nsec int64) os.Error {
var tv = syscall.NsecToTimeval(nsec)
return os.NewSyscallError("setsockopt", syscall.SetsockoptTimeval(fd.sysfd, level, opt, &tv))
}
func setReadBuffer(fd *netFD, bytes int) os.Error {
fd.incref()
defer fd.decref()
return setsockoptInt(fd, syscall.SOL_SOCKET, syscall.SO_RCVBUF, bytes)
}
func setWriteBuffer(fd *netFD, bytes int) os.Error {
fd.incref()
defer fd.decref()
return setsockoptInt(fd, syscall.SOL_SOCKET, syscall.SO_SNDBUF, bytes)
}
func setReadTimeout(fd *netFD, nsec int64) os.Error {
fd.rdeadline_delta = nsec
return nil
}
func setWriteTimeout(fd *netFD, nsec int64) os.Error {
fd.wdeadline_delta = nsec
return nil
}
func setTimeout(fd *netFD, nsec int64) os.Error {
if e := setReadTimeout(fd, nsec); e != nil {
return e
}
return setWriteTimeout(fd, nsec)
}
func setReuseAddr(fd *netFD, reuse bool) os.Error {
fd.incref()
defer fd.decref()
return setsockoptInt(fd, syscall.SOL_SOCKET, syscall.SO_REUSEADDR, boolint(reuse))
}
func bindToDevice(fd *netFD, dev string) os.Error {
// TODO(rsc): call setsockopt with null-terminated string pointer
return os.EINVAL
}
func setDontRoute(fd *netFD, dontroute bool) os.Error {
fd.incref()
defer fd.decref()
return setsockoptInt(fd, syscall.SOL_SOCKET, syscall.SO_DONTROUTE, boolint(dontroute))
}
func setKeepAlive(fd *netFD, keepalive bool) os.Error {
fd.incref()
defer fd.decref()
return setsockoptInt(fd, syscall.SOL_SOCKET, syscall.SO_KEEPALIVE, boolint(keepalive))
}
func setNoDelay(fd *netFD, noDelay bool) os.Error {
fd.incref()
defer fd.decref()
return setsockoptInt(fd, syscall.IPPROTO_TCP, syscall.TCP_NODELAY, boolint(noDelay))
}
func setLinger(fd *netFD, sec int) os.Error {
var l syscall.Linger
if sec >= 0 {
l.Onoff = 1
l.Linger = int32(sec)
} else {
l.Onoff = 0
l.Linger = 0
}
fd.incref()
defer fd.decref()
e := syscall.SetsockoptLinger(fd.sysfd, syscall.SOL_SOCKET, syscall.SO_LINGER, &l)
return os.NewSyscallError("setsockopt", e)
}
type UnknownSocketError struct {
sa syscall.Sockaddr
}
func (e *UnknownSocketError) String() string {
return "unknown socket address type " + reflect.TypeOf(e.sa).String()
}
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 os.Error) {
// Use wrapper to hide existing r.ReadFrom from io.Copy.
return io.Copy(writerOnly{w}, r)
}
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