2009-11-01 12:15:34 -07:00
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// 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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2011-12-21 03:44:47 -07:00
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// +build darwin freebsd linux netbsd openbsd windows
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build: add build comments to core packages
The go/build package already recognizes
system-specific file names like
mycode_darwin.go
mycode_darwin_386.go
mycode_386.s
However, it is also common to write files that
apply to multiple architectures, so a recent CL added
to go/build the ability to process comments
listing a set of conditions for building. For example:
// +build darwin freebsd openbsd/386
says that this file should be compiled only on
OS X, FreeBSD, or 32-bit x86 OpenBSD systems.
These conventions are not yet documented
(hence this long CL description).
This CL adds build comments to the multi-system
files in the core library, a step toward making it
possible to use go/build to build them.
With this change go/build can handle crypto/rand,
exec, net, path/filepath, os/user, and time.
os and syscall need additional adjustments.
R=golang-dev, r, gri, r, gustavo
CC=golang-dev
https://golang.org/cl/5011046
2011-09-15 14:48:57 -06:00
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2009-11-01 12:15:34 -07:00
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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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2009-11-01 12:15:34 -07:00
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)
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2012-01-13 21:42:18 -07:00
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var listenerBacklog = maxListenerBacklog()
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2009-11-01 12:15:34 -07:00
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// Generic socket creation.
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2012-08-23 05:54:00 -06:00
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func socket(net string, f, t, p int, ipv6only bool, ulsa, ursa 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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2012-01-19 15:31:13 -07:00
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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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if err = setDefaultSockopts(s, f, t, ipv6only); err != nil {
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closesocket(s)
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return nil, err
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}
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2010-09-24 14:52:06 -06:00
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var blsa syscall.Sockaddr
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if ulsa != nil {
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if blsa, err = listenerSockaddr(s, f, ulsa, toAddr); err != nil {
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closesocket(s)
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return nil, err
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}
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if err = syscall.Bind(s, blsa); 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 ursa != nil {
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if err = fd.connect(ursa); 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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var laddr Addr
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if ulsa != nil && blsa != ulsa {
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laddr = toAddr(ulsa)
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} else {
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laddr = localSockname(fd, toAddr)
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}
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fd.setAddr(laddr, remoteSockname(fd, toAddr))
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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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func localSockname(fd *netFD, toAddr func(syscall.Sockaddr) Addr) Addr {
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sa, _ := syscall.Getsockname(fd.sysfd)
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if sa == nil {
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return nullProtocolAddr(fd.family, fd.sotype)
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}
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return toAddr(sa)
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}
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func remoteSockname(fd *netFD, toAddr func(syscall.Sockaddr) Addr) Addr {
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sa, _ := syscall.Getpeername(fd.sysfd)
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if sa == nil {
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return nullProtocolAddr(fd.family, fd.sotype)
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}
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return toAddr(sa)
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}
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func nullProtocolAddr(f, t int) Addr {
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switch f {
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case syscall.AF_INET, syscall.AF_INET6:
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switch t {
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case syscall.SOCK_STREAM:
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return (*TCPAddr)(nil)
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case syscall.SOCK_DGRAM:
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return (*UDPAddr)(nil)
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case syscall.SOCK_RAW:
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return (*IPAddr)(nil)
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}
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case syscall.AF_UNIX:
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switch t {
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case syscall.SOCK_STREAM, syscall.SOCK_DGRAM, syscall.SOCK_SEQPACKET:
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return (*UnixAddr)(nil)
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}
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}
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panic("unreachable")
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}
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