net: add ReadFrom and WriteTo windows version.

Fixes #1275.

R=rsc, brainman
CC=golang-dev
https://golang.org/cl/3136042

src/pkg/net/fd_windows.go

@@ -243,8 +243,43 @@ func (fd *netFD) Read(p []byte) (n int, err os.Error) {
 }
 
 func (fd *netFD) ReadFrom(p []byte) (n int, sa syscall.Sockaddr, err os.Error) {
-	var r syscall.Sockaddr
-	return 0, r, nil
+	if fd == nil {
+		return 0, nil, os.EINVAL
+	}
+	if len(p) == 0 {
+		return 0, nil, nil
+	}
+	fd.rio.Lock()
+	defer fd.rio.Unlock()
+	fd.incref()
+	defer fd.decref()
+	if fd.sysfile == nil {
+		return 0, nil, os.EINVAL
+	}
+	// Submit receive request.
+	var pckt ioPacket
+	pckt.c = fd.cr
+	var done uint32
+	flags := uint32(0)
+	var rsa syscall.RawSockaddrAny
+	l := int32(unsafe.Sizeof(rsa))
+	e := syscall.WSARecvFrom(uint32(fd.sysfd), newWSABuf(p), 1, &done, &flags, &rsa, &l, &pckt.o, nil)
+	switch e {
+	case 0:
+		// IO completed immediately, but we need to get our completion message anyway.
+	case syscall.ERROR_IO_PENDING:
+		// IO started, and we have to wait for it's completion.
+	default:
+		return 0, nil, &OpError{"WSARecvFrom", fd.net, fd.laddr, os.Errno(e)}
+	}
+	// Wait for our request to complete.
+	r := <-pckt.c
+	if r.errno != 0 {
+		err = &OpError{"WSARecvFrom", fd.net, fd.laddr, os.Errno(r.errno)}
+	}
+	n = int(r.qty)
+	sa, _ = rsa.Sockaddr()
+	return
 }
 
 func (fd *netFD) Write(p []byte) (n int, err os.Error) {
@@ -281,7 +316,39 @@ func (fd *netFD) Write(p []byte) (n int, err os.Error) {
 }
 
 func (fd *netFD) WriteTo(p []byte, sa syscall.Sockaddr) (n int, err os.Error) {
+	if fd == nil {
+		return 0, os.EINVAL
+	}
+	if len(p) == 0 {
 		return 0, nil
+	}
+	fd.wio.Lock()
+	defer fd.wio.Unlock()
+	fd.incref()
+	defer fd.decref()
+	if fd.sysfile == nil {
+		return 0, os.EINVAL
+	}
+	// Submit send request.
+	var pckt ioPacket
+	pckt.c = fd.cw
+	var done uint32
+	e := syscall.WSASendto(uint32(fd.sysfd), newWSABuf(p), 1, &done, 0, sa, &pckt.o, nil)
+	switch e {
+	case 0:
+		// IO completed immediately, but we need to get our completion message anyway.
+	case syscall.ERROR_IO_PENDING:
+		// IO started, and we have to wait for it's completion.
+	default:
+		return 0, &OpError{"WSASendTo", fd.net, fd.laddr, os.Errno(e)}
+	}
+	// Wait for our request to complete.
+	r := <-pckt.c
+	if r.errno != 0 {
+		err = &OpError{"WSASendTo", fd.net, fd.laddr, os.Errno(r.errno)}
+	}
+	n = int(r.qty)
+	return
 }
 
 func (fd *netFD) accept(toAddr func(syscall.Sockaddr) Addr) (nfd *netFD, err os.Error) {

src/pkg/syscall/syscall_windows.go

@@ -467,6 +467,8 @@ func Utimes(path string, tv []Timeval) (errno int) {
 //sys	GetAcceptExSockaddrs(buf *byte, rxdatalen uint32, laddrlen uint32, raddrlen uint32, lrsa **RawSockaddrAny, lrsalen *int32, rrsa **RawSockaddrAny, rrsalen *int32) = wsock32.GetAcceptExSockaddrs
 //sys	WSARecv(s uint32, bufs *WSABuf, bufcnt uint32, recvd *uint32, flags *uint32, overlapped *Overlapped, croutine *byte) (errno int) [failretval=-1] = ws2_32.WSARecv
 //sys	WSASend(s uint32, bufs *WSABuf, bufcnt uint32, sent *uint32, flags uint32, overlapped *Overlapped, croutine *byte) (errno int) [failretval=-1] = ws2_32.WSASend
+//sys	WSARecvFrom(s uint32, bufs *WSABuf, bufcnt uint32, recvd *uint32, flags *uint32,  from *RawSockaddrAny, fromlen *int32, overlapped *Overlapped, croutine *byte) (errno int) [failretval=-1] = ws2_32.WSARecvFrom
+//sys	WSASendTo(s uint32, bufs *WSABuf, bufcnt uint32, sent *uint32, flags uint32, to *RawSockaddrAny, tolen int32,  overlapped *Overlapped, croutine *byte) (errno int) [failretval=-1] = ws2_32.WSASendTo
 //sys	GetHostByName(name string) (h *Hostent, errno int) [failretval=nil] = ws2_32.gethostbyname
 //sys	GetServByName(name string, proto string) (s *Servent, errno int) [failretval=nil] = ws2_32.getservbyname
 //sys	Ntohs(netshort uint16) (u uint16) = ws2_32.ntohs
@@ -633,6 +635,15 @@ func GetAcceptIOCPSockaddrs(attrs *byte) (lsa, rsa Sockaddr) {
 	return
 }
 
+func WSASendto(s uint32, bufs *WSABuf, bufcnt uint32, sent *uint32, flags uint32, to Sockaddr, overlapped *Overlapped, croutine *byte) (errno int) {
+	rsa, l, err := to.sockaddr()
+	if err != 0 {
+		return err
+	}
+	errno = WSASendTo(s, bufs, bufcnt, sent, flags, (*RawSockaddrAny)(unsafe.Pointer(rsa)), l, overlapped, croutine)
+	return
+}
+
 // TODO(brainman): fix all needed for net
 
 func Accept(fd int) (nfd int, sa Sockaddr, errno int)                        { return 0, nil, EWINDOWS }

src/pkg/syscall/zsyscall_windows_386.go

@@ -75,6 +75,8 @@ var (
 	procGetAcceptExSockaddrs       = getSysProcAddr(modwsock32, "GetAcceptExSockaddrs")
 	procWSARecv                    = getSysProcAddr(modws2_32, "WSARecv")
 	procWSASend                    = getSysProcAddr(modws2_32, "WSASend")
+	procWSARecvFrom                = getSysProcAddr(modws2_32, "WSARecvFrom")
+	procWSASendTo                  = getSysProcAddr(modws2_32, "WSASendTo")
 	procgethostbyname              = getSysProcAddr(modws2_32, "gethostbyname")
 	procgetservbyname              = getSysProcAddr(modws2_32, "getservbyname")
 	procntohs                      = getSysProcAddr(modws2_32, "ntohs")
@@ -983,6 +985,34 @@ func WSASend(s uint32, bufs *WSABuf, bufcnt uint32, sent *uint32, flags uint32,
 	return
 }
 
+func WSARecvFrom(s uint32, bufs *WSABuf, bufcnt uint32, recvd *uint32, flags *uint32, from *RawSockaddrAny, fromlen *int32, overlapped *Overlapped, croutine *byte) (errno int) {
+	r1, _, e1 := Syscall9(procWSARecvFrom, uintptr(s), uintptr(unsafe.Pointer(bufs)), uintptr(bufcnt), uintptr(unsafe.Pointer(recvd)), uintptr(unsafe.Pointer(flags)), uintptr(unsafe.Pointer(from)), uintptr(unsafe.Pointer(fromlen)), uintptr(unsafe.Pointer(overlapped)), uintptr(unsafe.Pointer(croutine)))
+	if int(r1) == -1 {
+		if e1 != 0 {
+			errno = int(e1)
+		} else {
+			errno = EINVAL
+		}
+	} else {
+		errno = 0
+	}
+	return
+}
+
+func WSASendTo(s uint32, bufs *WSABuf, bufcnt uint32, sent *uint32, flags uint32, to *RawSockaddrAny, tolen int32, overlapped *Overlapped, croutine *byte) (errno int) {
+	r1, _, e1 := Syscall9(procWSASendTo, uintptr(s), uintptr(unsafe.Pointer(bufs)), uintptr(bufcnt), uintptr(unsafe.Pointer(sent)), uintptr(flags), uintptr(unsafe.Pointer(to)), uintptr(tolen), uintptr(unsafe.Pointer(overlapped)), uintptr(unsafe.Pointer(croutine)))
+	if int(r1) == -1 {
+		if e1 != 0 {
+			errno = int(e1)
+		} else {
+			errno = EINVAL
+		}
+	} else {
+		errno = 0
+	}
+	return
+}
+
 func GetHostByName(name string) (h *Hostent, errno int) {
 	r0, _, e1 := Syscall(procgethostbyname, uintptr(unsafe.Pointer(StringBytePtr(name))), 0, 0)
 	h = (*Hostent)(unsafe.Pointer(r0))