func timeoutIO() {
// CancelIO only cancels all pending input and output (I/O) operations that are
// issued by the calling thread for the specified file, does not cancel I/O
// operations that other threads issue for a file handle. So we need do all timeout
// I/O in single OS thread.
runtime.LockOSThread()
defer runtime.UnlockOSThread()
for {
o := <-ioChan
var e int
switch o.f {
case read:
e = syscall.WSARecv(uint32(o.fd.sysfd), o.pckt.w, 1, o.done, o.flags, &o.pckt.o, nil)
case readfrom:
e = syscall.WSARecvFrom(uint32(o.fd.sysfd), o.pckt.w, 1, o.done, o.flags, o.rsa, o.size, &o.pckt.o, nil)
case write:
e = syscall.WSASend(uint32(o.fd.sysfd), o.pckt.w, 1, o.done, uint32(0), &o.pckt.o, nil)
case writeto:
e = syscall.WSASendto(uint32(o.fd.sysfd), o.pckt.w, 1, o.done, 0, *o.sa, &o.pckt.o, nil)
case cancel:
_, e = syscall.CancelIo(uint32(o.fd.sysfd))
}
o.c <- e
}
}
func (s *Ssdp) read() ([]byte, string, error) {
bufs := syscall.WSABuf{
Len: 2048,
Buf: &s.socket.readBytes[0],
}
var n, flags uint32
var asIp4 syscall.RawSockaddrInet4
fromAny := (*syscall.RawSockaddrAny)(unsafe.Pointer(&asIp4))
fromSize := int32(unsafe.Sizeof(asIp4))
err := syscall.WSARecvFrom(s.socket.socket, &bufs, 1, &n, &flags, fromAny, &fromSize, nil, nil)
if err != nil {
return nil, "", err
}
if n > 0 {
// need to convert the port bytes ordering
portBytes := make([]byte, 6)
binary.BigEndian.PutUint16(portBytes, asIp4.Port)
port := binary.LittleEndian.Uint16(portBytes)
// set the address
src := fmt.Sprintf("%d.%d.%d.%d:%d", asIp4.Addr[0], asIp4.Addr[1], asIp4.Addr[2], asIp4.Addr[3], port)
//s.logger.Infof("Message: %s", string(readBytes[0:n]))
return s.socket.readBytes[0:n], src, nil
}
return nil, "", nil
}
func (fd *netFD) readFrom(buf []byte) (int, syscall.Sockaddr, error) {
if len(buf) == 0 {
return 0, nil, nil
}
if err := fd.readLock(); err != nil {
return 0, nil, err
}
defer fd.readUnlock()
o := &fd.rop
o.InitBuf(buf)
n, err := rsrv.ExecIO(o, "WSARecvFrom", func(o *operation) error {
if o.rsa == nil {
o.rsa = new(syscall.RawSockaddrAny)
}
o.rsan = int32(unsafe.Sizeof(*o.rsa))
return syscall.WSARecvFrom(o.fd.sysfd, &o.buf, 1, &o.qty, &o.flags, o.rsa, &o.rsan, &o.o, nil)
})
err = fd.eofError(n, err)
if _, ok := err.(syscall.Errno); ok {
err = os.NewSyscallError("wsarecvfrom", err)
}
if err != nil {
return n, nil, err
}
sa, _ := o.rsa.Sockaddr()
return n, sa, nil
}
func (fd *netFD) ReadFrom(p []byte) (n int, sa syscall.Sockaddr, err os.Error) {
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.sysfd == -1 {
return 0, nil, os.EINVAL
}
// Submit receive request.
var pckt ioPacket
pckt.c = fd.cr
pckt.w = newWSABuf(p)
var done uint32
flags := uint32(0)
var rsa syscall.RawSockaddrAny
l := int32(unsafe.Sizeof(rsa))
var e int
if fd.rdeadline_delta > 0 {
a := &arg{f: readfrom, fd: fd, pckt: &pckt, done: &done, flags: &flags, rsa: &rsa, size: &l, c: make(chan int)}
ioChan <- a
e = <-a.c
} else {
e = syscall.WSARecvFrom(uint32(fd.sysfd), pckt.w, 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 := waitPacket(fd, &pckt, 'r')
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) ReadFrom(buf []byte) (n int, sa syscall.Sockaddr, err error) {
if len(buf) == 0 {
return 0, nil, nil
}
if err := fd.readLock(); err != nil {
return 0, nil, err
}
defer fd.readUnlock()
o := &fd.rop
o.InitBuf(buf)
n, err = rsrv.ExecIO(o, "WSARecvFrom", func(o *operation) error {
if o.rsa == nil {
o.rsa = new(syscall.RawSockaddrAny)
}
o.rsan = int32(unsafe.Sizeof(*o.rsa))
return syscall.WSARecvFrom(o.fd.sysfd, &o.buf, 1, &o.qty, &o.flags, o.rsa, &o.rsan, &o.o, nil)
})
if err != nil {
return 0, nil, err
}
sa, _ = o.rsa.Sockaddr()
return
}
func (o *readFromOp) Submit() error {
var d, f uint32
return syscall.WSARecvFrom(o.fd.sysfd, &o.buf, 1, &d, &f, &o.rsa, &o.rsan, &o.o, nil)
}
func (o *readFromOp) Submit() (errno int) {
var d, f uint32
l := int32(unsafe.Sizeof(o.rsa))
return syscall.WSARecvFrom(o.fd.sysfd, &o.buf, 1, &d, &f, &o.rsa, &l, &o.o, nil)
}