gcc/libjava/java/net/natPlainSocketImplPosix.cc

/* Copyright (C) 2003  Free Software Foundation

   This file is part of libgcj.

This software is copyrighted work licensed under the terms of the
Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
details.  */

#include <config.h>
#include <platform.h>

#ifdef HAVE_SYS_IOCTL_H
#define BSD_COMP /* Get FIONREAD on Solaris2. */
#include <sys/ioctl.h>
#endif

// Pick up FIONREAD on Solaris 2.5.
#ifdef HAVE_SYS_FILIO_H
#include <sys/filio.h>
#endif

#include <netinet/in.h>
#include <netinet/tcp.h>
#include <errno.h>
#include <string.h>

#if HAVE_BSTRING_H
// Needed for bzero, implicitly used by FD_ZERO on IRIX 5.2 
#include <bstring.h>
#endif

#include <gcj/cni.h>
#include <gcj/javaprims.h>
#include <java/io/IOException.h>
#include <java/io/InterruptedIOException.h>
#include <java/net/BindException.h>
#include <java/net/ConnectException.h>
#include <java/net/PlainSocketImpl.h>
#include <java/net/InetAddress.h>
#include <java/net/InetSocketAddress.h>
#include <java/net/SocketException.h>
#include <java/net/SocketTimeoutException.h>
#include <java/lang/InternalError.h>
#include <java/lang/Object.h>
#include <java/lang/Boolean.h>
#include <java/lang/Class.h>
#include <java/lang/Integer.h>
#include <java/lang/Thread.h>
#include <java/lang/NullPointerException.h>
#include <java/lang/ArrayIndexOutOfBoundsException.h>
#include <java/lang/IllegalArgumentException.h>

union SockAddr
{
  struct sockaddr_in address;
#ifdef HAVE_INET6
  struct sockaddr_in6 address6;
#endif
};

void
java::net::PlainSocketImpl::create (jboolean stream)
{
  int sock = _Jv_socket (AF_INET, stream ? SOCK_STREAM : SOCK_DGRAM, 0);

  if (sock < 0)
    {
      char* strerr = strerror (errno);
      throw new java::io::IOException (JvNewStringUTF (strerr));
    }

  _Jv_platform_close_on_exec (sock);

  // We use fnum in place of fd here.  From leaving fd null we avoid
  // the double close problem in FileDescriptor.finalize.
  fnum = sock;
}

void
java::net::PlainSocketImpl::bind (java::net::InetAddress *host, jint lport)
{
  union SockAddr u;
  struct sockaddr *ptr = (struct sockaddr *) &u.address;
  jbyteArray haddress = host->addr;
  jbyte *bytes = elements (haddress);
  int len = haddress->length;
  int i = 1;

  if (len == 4)
    {
      u.address.sin_family = AF_INET;

      if (host != NULL)
        memcpy (&u.address.sin_addr, bytes, len);
      else
        u.address.sin_addr.s_addr = htonl (INADDR_ANY);

      len = sizeof (struct sockaddr_in);
      u.address.sin_port = htons (lport);
    }
#ifdef HAVE_INET6
  else if (len == 16)
    {
      u.address6.sin6_family = AF_INET6;
      memcpy (&u.address6.sin6_addr, bytes, len);
      len = sizeof (struct sockaddr_in6);
      u.address6.sin6_port = htons (lport);
    }
#endif
  else
    throw new java::net::SocketException (JvNewStringUTF ("invalid length"));

  // Enable SO_REUSEADDR, so that servers can reuse ports left in TIME_WAIT.
  ::setsockopt(fnum, SOL_SOCKET, SO_REUSEADDR, (char *) &i, sizeof(i));
  
  if (_Jv_bind (fnum, ptr, len) == 0)
    {
      address = host;
      socklen_t addrlen = sizeof(u);

      if (lport != 0)
        localport = lport;
      else if (::getsockname (fnum, (sockaddr*) &u, &addrlen) == 0)
        localport = ntohs (u.address.sin_port);
      else
        goto error;

      return;
    }

 error:
  char* strerr = strerror (errno);
  throw new java::net::BindException (JvNewStringUTF (strerr));
}

void
java::net::PlainSocketImpl::connect (java::net::SocketAddress *addr,
                                     jint timeout)
{
  java::net::InetSocketAddress *tmp = (java::net::InetSocketAddress*) addr;
  java::net::InetAddress *host = tmp->getAddress();
  jint rport = tmp->getPort();
	
  union SockAddr u;
  socklen_t addrlen = sizeof(u);
  jbyteArray haddress = host->addr;
  jbyte *bytes = elements (haddress);
  int len = haddress->length;
  struct sockaddr *ptr = (struct sockaddr *) &u.address;
  if (len == 4)
    {
      u.address.sin_family = AF_INET;
      memcpy (&u.address.sin_addr, bytes, len);
      len = sizeof (struct sockaddr_in);
      u.address.sin_port = htons (rport);
    }
#ifdef HAVE_INET6
  else if (len == 16)
    {
      u.address6.sin6_family = AF_INET6;
      memcpy (&u.address6.sin6_addr, bytes, len);
      len = sizeof (struct sockaddr_in6);
      u.address6.sin6_port = htons (rport);
    }
#endif
  else
    throw new java::net::SocketException (JvNewStringUTF ("invalid length"));

  if (timeout > 0)
    {
      int flags = ::fcntl (fnum, F_GETFL);
      ::fcntl (fnum, F_SETFL, flags | O_NONBLOCK);
      
      if ((_Jv_connect (fnum, ptr, len) != 0) && (errno != EINPROGRESS))
        goto error;

      fd_set rset;
      struct timeval tv;
      FD_ZERO(&rset);
      FD_SET(fnum, &rset);
      tv.tv_sec = timeout / 1000;
      tv.tv_usec = (timeout % 1000) * 1000;
      int retval;
      
      if ((retval = _Jv_select (fnum + 1, &rset, NULL, NULL, &tv)) < 0)
        goto error;
      else if (retval == 0)
        throw new java::net::SocketTimeoutException
          (JvNewStringUTF ("Connect timed out"));
    }
  else
    {
      if (_Jv_connect (fnum, ptr, len) != 0)
        goto error;
    }

  address = host;
  port = rport;

  // A bind may not have been done on this socket; if so, set localport now.
  if (localport == 0)
    {
      if (::getsockname (fnum, (sockaddr*) &u, &addrlen) == 0)
        localport = ntohs (u.address.sin_port);
      else
        goto error;
    }

  return;  

 error:
  char* strerr = strerror (errno);
  throw new java::net::ConnectException (JvNewStringUTF (strerr));
}

void
java::net::PlainSocketImpl::listen (jint backlog)
{
  if (::listen (fnum, backlog) != 0)
    {
      char* strerr = strerror (errno);
      throw new java::io::IOException (JvNewStringUTF (strerr));
    }
}

void
java::net::PlainSocketImpl::accept (java::net::PlainSocketImpl *s)
{
  union SockAddr u;
  socklen_t addrlen = sizeof(u);
  int new_socket = 0; 

  // Do timeouts via select since SO_RCVTIMEO is not always available.
  if (timeout > 0 && fnum >= 0 && fnum < FD_SETSIZE)
    {
      fd_set rset;
      struct timeval tv;
      FD_ZERO(&rset);
      FD_SET(fnum, &rset);
      tv.tv_sec = timeout / 1000;
      tv.tv_usec = (timeout % 1000) * 1000;
      int retval;
      if ((retval = _Jv_select (fnum + 1, &rset, NULL, NULL, &tv)) < 0)
        goto error;
      else if (retval == 0)
        throw new java::io::InterruptedIOException (
	                                  JvNewStringUTF("Accept timed out"));
    }

  new_socket = _Jv_accept (fnum, (sockaddr*) &u, &addrlen);

  if (new_socket < 0)
    goto error;

  _Jv_platform_close_on_exec (new_socket);

  jbyteArray raddr;
  jint rport;
  if (u.address.sin_family == AF_INET)
    {
      raddr = JvNewByteArray (4);
      memcpy (elements (raddr), &u.address.sin_addr, 4);
      rport = ntohs (u.address.sin_port);
    }
#ifdef HAVE_INET6
  else if (u.address.sin_family == AF_INET6)
    {
      raddr = JvNewByteArray (16);
      memcpy (elements (raddr), &u.address6.sin6_addr, 16);
      rport = ntohs (u.address6.sin6_port);
    }
#endif
  else
    throw new java::net::SocketException (JvNewStringUTF ("invalid family"));

  s->fnum = new_socket;
  s->localport = localport;
  s->address = new InetAddress (raddr, NULL);
  s->port = rport;
  return;

 error:
  char* strerr = strerror (errno);
  throw new java::io::IOException (JvNewStringUTF (strerr));
}

// Close(shutdown) the socket.
void
java::net::PlainSocketImpl::close()
{
  // Avoid races from asynchronous finalization.
  JvSynchronize sync (this);

  // should we use shutdown here? how would that effect so_linger?
  int res = _Jv_close (fnum);

  if (res == -1)
    {
      // These three errors are not errors according to tests performed
      // on the reference implementation.
      if (errno != ENOTCONN && errno != ECONNRESET && errno != EBADF)
        throw new java::io::IOException  (JvNewStringUTF (strerror (errno)));
    }
  // Safe place to reset the file pointer.
  fnum = -1;
  timeout = 0;
}

// Write a byte to the socket.
void
java::net::PlainSocketImpl::write(jint b)
{
  jbyte d =(jbyte) b;
  int r = 0;

  while (r != 1)
    {
      r = _Jv_write (fnum, &d, 1);
      if (r == -1)
        {
          if (java::lang::Thread::interrupted())
            {
              java::io::InterruptedIOException *iioe
                = new java::io::InterruptedIOException 
                (JvNewStringLatin1 (strerror (errno)));
              iioe->bytesTransferred = 0;
              throw iioe;
            }
          // Some errors should not cause exceptions.
          if (errno != ENOTCONN && errno != ECONNRESET && errno != EBADF)
            throw new java::io::IOException (JvNewStringUTF (strerror (errno)));
          break;
        }
    }
}

// Write some bytes to the socket.
void
java::net::PlainSocketImpl::write(jbyteArray b, jint offset, jint len)
{
  if (! b)
    throw new java::lang::NullPointerException;
  if (offset < 0 || len < 0 || offset + len > JvGetArrayLength (b))
    throw new java::lang::ArrayIndexOutOfBoundsException;

  jbyte *bytes = elements (b) + offset;
  int written = 0;

  while (len > 0)
    {
      int r = _Jv_write (fnum, bytes, len);

      if (r == -1)
        {
          if (java::lang::Thread::interrupted())
            {
              java::io::InterruptedIOException *iioe
                = new java::io::InterruptedIOException
                (JvNewStringLatin1 (strerror (errno)));
              iioe->bytesTransferred = written;
              throw iioe;
            }
          // Some errors should not cause exceptions.
          if (errno != ENOTCONN && errno != ECONNRESET && errno != EBADF)
            throw new java::io::IOException (JvNewStringUTF (strerror (errno)));
          break;
        }

      written += r;
      len -= r;
      bytes += r;
    }
}

void
java::net::PlainSocketImpl::sendUrgentData (jint)
{
  throw new SocketException (JvNewStringLatin1 (
    "PlainSocketImpl: sending of urgent data not supported by this socket"));
}

// Read a single byte from the socket.
jint
java::net::PlainSocketImpl::read(void)
{
  jbyte b;

  // Do timeouts via select.
  if (timeout > 0 && fnum >= 0 && fnum < FD_SETSIZE)
    {
      // Create the file descriptor set.
      fd_set read_fds;
      FD_ZERO (&read_fds);
      FD_SET (fnum,&read_fds);
      // Create the timeout struct based on our internal timeout value.
      struct timeval timeout_value;
      timeout_value.tv_sec = timeout / 1000;
      timeout_value.tv_usec = (timeout % 1000) * 1000;
      // Select on the fds.
      int sel_retval =
        _Jv_select (fnum + 1, &read_fds, NULL, NULL, &timeout_value);
      // If select returns 0 we've waited without getting data...
      // that means we've timed out.
      if (sel_retval == 0)
        throw new java::io::InterruptedIOException
          (JvNewStringUTF ("read timed out") );
      // If select returns ok we know we either got signalled or read some data...
      // either way we need to try to read.
    }

  int r = _Jv_read (fnum, &b, 1);

  if (r == 0)
    return -1;

  if (java::lang::Thread::interrupted())
    {
      java::io::InterruptedIOException *iioe =
        new java::io::InterruptedIOException
        (JvNewStringUTF("read interrupted"));
      iioe->bytesTransferred = r == -1 ? 0 : r;
      throw iioe;
    }
  else if (r == -1)
    {
      // Some errors cause us to return end of stream...
      if (errno == ENOTCONN)
        return -1;

      // Other errors need to be signalled.
      throw new java::io::IOException (JvNewStringUTF (strerror (errno)));
    }

  return b & 0xFF;
}

// Read count bytes into the buffer, starting at offset.
jint
java::net::PlainSocketImpl::read(jbyteArray buffer, jint offset, jint count)
{
  if (! buffer)
    throw new java::lang::NullPointerException;

  jsize bsize = JvGetArrayLength (buffer);

  if (offset < 0 || count < 0 || offset + count > bsize)
    throw new java::lang::ArrayIndexOutOfBoundsException;

  jbyte *bytes = elements (buffer) + offset;

  // Do timeouts via select.
  if (timeout > 0 && fnum >= 0 && fnum < FD_SETSIZE)
    {
      // Create the file descriptor set.
      fd_set read_fds;
      FD_ZERO (&read_fds);
      FD_SET (fnum, &read_fds);
      // Create the timeout struct based on our internal timeout value.
      struct timeval timeout_value;
      timeout_value.tv_sec = timeout / 1000;
      timeout_value.tv_usec =(timeout % 1000) * 1000;
      // Select on the fds.
      int sel_retval =
        _Jv_select (fnum + 1, &read_fds, NULL, NULL, &timeout_value);
      // We're only interested in the 0 return.
      // error returns still require us to try to read 
      // the socket to see what happened.
      if (sel_retval == 0)
        {
          java::io::InterruptedIOException *iioe =
            new java::io::InterruptedIOException
            (JvNewStringUTF ("read interrupted"));
          iioe->bytesTransferred = 0;
          throw iioe;
        }
    }

  // Read the socket.
  int r = ::recv (fnum, (char *) bytes, count, 0);

  if (r == 0)
    return -1;

  if (java::lang::Thread::interrupted())
    {
      java::io::InterruptedIOException *iioe =
        new java::io::InterruptedIOException
        (JvNewStringUTF ("read interrupted"));
      iioe->bytesTransferred = r == -1 ? 0 : r;
      throw iioe;
    }
  else if (r == -1)
    {
      // Some errors cause us to return end of stream...
      if (errno == ENOTCONN)
        return -1;

      // Other errors need to be signalled.
      throw new java::io::IOException (JvNewStringUTF (strerror (errno)));
    }

  return r;
}

// How many bytes are available?
jint
java::net::PlainSocketImpl::available(void)
{
#if defined(FIONREAD) || defined(HAVE_SELECT)
  long num = 0;
  int r = 0;
  bool num_set = false;

#if defined(FIONREAD)
  r = ::ioctl (fnum, FIONREAD, &num);

  if (r == -1 && errno == ENOTTY)
    {
      // If the ioctl doesn't work, we don't care.
      r = 0;
      num = 0;
    }
  else
    num_set = true;
#elif defined(HAVE_SELECT)
  if (fnum < 0)
    {
      errno = EBADF;
      r = -1;
    }
#endif

  if (r == -1)
    {
    posix_error:
      throw new java::io::IOException(JvNewStringUTF(strerror(errno)));
    }

  // If we didn't get anything we can use select.

#if defined(HAVE_SELECT)
  if (! num_set)
    if (! num_set && fnum >= 0 && fnum < FD_SETSIZE)
      {
        fd_set rd;
        FD_ZERO (&rd);
        FD_SET (fnum, &rd);
        struct timeval tv;
        tv.tv_sec = 0;
        tv.tv_usec = 0;
        r = _Jv_select (fnum + 1, &rd, NULL, NULL, &tv);
        if(r == -1)
          goto posix_error;
        num = r == 0 ? 0 : 1;
      }
#endif /* HAVE_SELECT */

  return (jint) num;
#else
  throw new java::io::IOException (JvNewStringUTF ("unimplemented"));
#endif
}

void
java::net::PlainSocketImpl::setOption (jint optID, java::lang::Object *value)
{
  int val;
  socklen_t val_len = sizeof (val);

  if (fnum < 0)
    throw new java::net::SocketException (JvNewStringUTF ("Socket closed"));

  if (_Jv_IsInstanceOf (value, &java::lang::Boolean::class$))
    {
      java::lang::Boolean *boolobj = 
        static_cast<java::lang::Boolean *> (value);
      if (boolobj->booleanValue())
        val = 1; 
      else 
        {
          if (optID == _Jv_SO_LINGER_)
            val = -1;
          else
            val = 0;
        }
    }
  else if (_Jv_IsInstanceOf (value, &java::lang::Integer::class$))
    {
      java::lang::Integer *intobj = 
        static_cast<java::lang::Integer *> (value);          
      val = (int) intobj->intValue();
    }
  else
    {
      throw new java::lang::IllegalArgumentException (
        JvNewStringLatin1 ("`value' must be Boolean or Integer"));
    }

  switch (optID) 
    {
      case _Jv_TCP_NODELAY_ :
#ifdef TCP_NODELAY
        if (::setsockopt (fnum, IPPROTO_TCP, TCP_NODELAY, (char *) &val,
                          val_len) != 0)
          goto error;
#else
        throw new java::lang::InternalError
          (JvNewStringUTF ("TCP_NODELAY not supported"));
#endif /* TCP_NODELAY */
        return;

      case _Jv_SO_KEEPALIVE_ :
        if (::setsockopt (fnum, SOL_SOCKET, SO_KEEPALIVE, (char *) &val,
                          val_len) != 0)
          goto error;
        break;
      
      case _Jv_SO_BROADCAST_ :
        throw new java::net::SocketException
          (JvNewStringUTF ("SO_BROADCAST not valid for TCP"));
        break;
	
      case _Jv_SO_OOBINLINE_ :
        if (::setsockopt (fnum, SOL_SOCKET, SO_OOBINLINE, (char *) &val,
                          val_len) != 0)
          goto error;
        break;

      case _Jv_SO_LINGER_ :
#ifdef SO_LINGER
        struct linger l_val;
        l_val.l_onoff = (val != -1);
        l_val.l_linger = val;

        if (::setsockopt (fnum, SOL_SOCKET, SO_LINGER, (char *) &l_val,
                          sizeof(l_val)) != 0)
          goto error;    
#else
        throw new java::lang::InternalError (
          JvNewStringUTF ("SO_LINGER not supported"));
#endif /* SO_LINGER */
        return;

      case _Jv_SO_SNDBUF_ :
      case _Jv_SO_RCVBUF_ :
#if defined(SO_SNDBUF) && defined(SO_RCVBUF)
        int opt;
        optID == _Jv_SO_SNDBUF_ ? opt = SO_SNDBUF : opt = SO_RCVBUF;
        if (::setsockopt (fnum, SOL_SOCKET, opt, (char *) &val, val_len) != 0)
          goto error;    
#else
        throw new java::lang::InternalError (
          JvNewStringUTF ("SO_RCVBUF/SO_SNDBUF not supported"));
#endif 
        return;

      case _Jv_SO_BINDADDR_ :
        throw new java::net::SocketException (
          JvNewStringUTF ("SO_BINDADDR: read only option"));
        return;

      case _Jv_IP_MULTICAST_IF_ :
        throw new java::net::SocketException (
          JvNewStringUTF ("IP_MULTICAST_IF: not valid for TCP"));
        return;
	
      case _Jv_IP_MULTICAST_IF2_ :
        throw new java::net::SocketException (
          JvNewStringUTF ("IP_MULTICAST_IF2: not valid for TCP"));
        break;
	
      case _Jv_IP_MULTICAST_LOOP_ :
        throw new java::net::SocketException (
          JvNewStringUTF ("IP_MULTICAST_LOOP: not valid for TCP"));
        break;
	
      case _Jv_IP_TOS_ :
        if (::setsockopt (fnum, SOL_SOCKET, IP_TOS, (char *) &val,
                          val_len) != 0)
          goto error;    
        break;
	
      case _Jv_SO_REUSEADDR_ :
        throw new java::net::SocketException (
          JvNewStringUTF ("SO_REUSEADDR: not valid for TCP"));
        return;

      case _Jv_SO_TIMEOUT_ :
        timeout = val;
        return;

      default :
        errno = ENOPROTOOPT;
    }

 error:
  char* strerr = strerror (errno);
  throw new java::net::SocketException (JvNewStringUTF (strerr));
}

java::lang::Object *
java::net::PlainSocketImpl::getOption (jint optID)
{
  int val;
  socklen_t val_len = sizeof(val);
  union SockAddr u;
  socklen_t addrlen = sizeof(u);
  struct linger l_val;
  socklen_t l_val_len = sizeof(l_val);

  switch (optID)
    {
#ifdef TCP_NODELAY
    case _Jv_TCP_NODELAY_ :
      if (::getsockopt (fnum, IPPROTO_TCP, TCP_NODELAY, (char *) &val,
                        &val_len) != 0)
        goto error;
      else
        return new java::lang::Boolean (val != 0);
#else
      throw new java::lang::InternalError
        (JvNewStringUTF ("TCP_NODELAY not supported"));
#endif       
      break;
      
    case _Jv_SO_LINGER_ :
#ifdef SO_LINGER
      if (::getsockopt (fnum, SOL_SOCKET, SO_LINGER, (char *) &l_val,
                        &l_val_len) != 0)
        goto error;    
 
      if (l_val.l_onoff)
        return new java::lang::Integer (l_val.l_linger);
      else
        return new java::lang::Boolean ((jboolean)false);
#else
      throw new java::lang::InternalError
        (JvNewStringUTF ("SO_LINGER not supported"));
#endif
      break;    

    case _Jv_SO_KEEPALIVE_ :
      if (::getsockopt (fnum, SOL_SOCKET, SO_KEEPALIVE, (char *) &val,
                        &val_len) != 0)
        goto error;
      else
        return new java::lang::Boolean (val != 0);

    case _Jv_SO_BROADCAST_ :
      if (::getsockopt (fnum, SOL_SOCKET, SO_BROADCAST, (char *) &val,
                        &val_len) != 0)
        goto error;    
      return new java::lang::Boolean ((jboolean)val);
	
    case _Jv_SO_OOBINLINE_ :
      if (::getsockopt (fnum, SOL_SOCKET, SO_OOBINLINE, (char *) &val,
                        &val_len) != 0)
        goto error;    
      return new java::lang::Boolean ((jboolean)val);
	
    case _Jv_SO_RCVBUF_ :
    case _Jv_SO_SNDBUF_ :
#if defined(SO_SNDBUF) && defined(SO_RCVBUF)
      int opt;
      optID == _Jv_SO_SNDBUF_ ? opt = SO_SNDBUF : opt = SO_RCVBUF;
      if (::getsockopt (fnum, SOL_SOCKET, opt, (char *) &val, &val_len) != 0)
        goto error;    
      else
        return new java::lang::Integer (val);
#else
      throw new java::lang::InternalError
        (JvNewStringUTF ("SO_RCVBUF/SO_SNDBUF not supported"));
#endif    
      break;
    case _Jv_SO_BINDADDR_:
      // cache the local address 
      if (localAddress == NULL)
        {
          jbyteArray laddr;

          if (::getsockname (fnum, (sockaddr*) &u, &addrlen) != 0)
            goto error;

          if (u.address.sin_family == AF_INET)
            {
              laddr = JvNewByteArray (4);
              memcpy (elements (laddr), &u.address.sin_addr, 4);
            }
#ifdef HAVE_INET6
          else if (u.address.sin_family == AF_INET6)
            {
              laddr = JvNewByteArray (16);
              memcpy (elements (laddr), &u.address6.sin6_addr, 16);
            }
#endif
          else
            throw new java::net::SocketException
              (JvNewStringUTF ("invalid family"));
          localAddress = new java::net::InetAddress (laddr, NULL);
        }

      return localAddress;
      break;
    case _Jv_IP_MULTICAST_IF_ :
      throw new java::net::SocketException
        (JvNewStringUTF ("IP_MULTICAST_IF: not valid for TCP"));
      break;
	
    case _Jv_IP_MULTICAST_IF2_ :
      throw new java::net::SocketException
        (JvNewStringUTF ("IP_MULTICAST_IF2: not valid for TCP"));
      break;
	
    case _Jv_IP_MULTICAST_LOOP_ :
      throw new java::net::SocketException
        (JvNewStringUTF ("IP_MULTICAST_LOOP: not valid for TCP"));
      break;
	
    case _Jv_IP_TOS_ :
      if (::getsockopt (fnum, SOL_SOCKET, IP_TOS, (char *) &val,
                        &val_len) != 0)
        goto error;
      return new java::lang::Integer (val);
      break;
	
    case _Jv_SO_REUSEADDR_ :
      throw new java::net::SocketException
        (JvNewStringUTF ("SO_REUSEADDR: not valid for TCP"));
      break;

    case _Jv_SO_TIMEOUT_ :
      return new java::lang::Integer (timeout);
      break;

    default :
      errno = ENOPROTOOPT;
    }

 error:
  char* strerr = strerror (errno);
  throw new java::net::SocketException (JvNewStringUTF (strerr));
}

void
java::net::PlainSocketImpl::shutdownInput (void)
{
  if (::shutdown (fnum, 0))
    throw new SocketException (JvNewStringUTF (strerror (errno)));
}

void
java::net::PlainSocketImpl::shutdownOutput (void)
{
  if (::shutdown (fnum, 1))
    throw new SocketException (JvNewStringUTF (strerror (errno)));
}