Pipe.cpp

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// $Id: Pipe.cpp 80826 2008-03-04 14:51:23Z wotte $

#include "ace/Pipe.h"
#include "ace/SOCK_Acceptor.h"
#include "ace/SOCK_Connector.h"
#include "ace/Log_Msg.h"
#include "ace/OS_NS_sys_socket.h"
#include "ace/OS_Memory.h"
#include "ace/Truncate.h"

#if defined (ACE_HAS_STREAM_PIPES) || defined (__QNX__)
#  include "ace/OS_NS_unistd.h"
#endif  // ACE_HAS_STREAM_PIPES || __QNX__

#include "ace/os_include/netinet/os_tcp.h"

#if !defined (__ACE_INLINE__)
#include "ace/Pipe.inl"
#endif /* __ACE_INLINE__ */

ACE_RCSID(ace, Pipe, "$Id: Pipe.cpp 80826 2008-03-04 14:51:23Z wotte $")

ACE_BEGIN_VERSIONED_NAMESPACE_DECL

void
ACE_Pipe::dump (void) const
{
#if defined (ACE_HAS_DUMP)
  ACE_TRACE ("ACE_Pipe::dump");
  ACE_DEBUG ((LM_DEBUG, ACE_BEGIN_DUMP, this));
  ACE_DEBUG ((LM_DEBUG, ACE_TEXT ("handles_[0] = %d"), this->handles_[0]));
  ACE_DEBUG ((LM_DEBUG, ACE_TEXT ("\nhandles_[1] = %d"), this->handles_[1]));
  ACE_DEBUG ((LM_DEBUG, ACE_TEXT ("\n")));
  ACE_DEBUG ((LM_DEBUG, ACE_END_DUMP));
#endif /* ACE_HAS_DUMP */
}

int
ACE_Pipe::open (int buffer_size)
{
  ACE_TRACE ("ACE_Pipe::open");

#if defined (ACE_LACKS_SOCKETPAIR) || defined (__Lynx__)
  ACE_INET_Addr my_addr;
  ACE_SOCK_Acceptor acceptor;
  ACE_SOCK_Connector connector;
  ACE_SOCK_Stream reader;
  ACE_SOCK_Stream writer;
  int result = 0;
# if defined (ACE_WIN32)
  ACE_INET_Addr local_any  (static_cast<u_short> (0), ACE_LOCALHOST);
# else
  ACE_Addr local_any = ACE_Addr::sap_any;
# endif /* ACE_WIN32 */

  // Bind listener to any port and then find out what the port was.
  if (acceptor.open (local_any) == -1
      || acceptor.get_local_addr (my_addr) == -1)
    result = -1;
  else
    {
      ACE_INET_Addr sv_addr (my_addr.get_port_number (),
                             ACE_LOCALHOST);

      // Establish a connection within the same process.
      if (connector.connect (writer, sv_addr) == -1)
        result = -1;
      else if (acceptor.accept (reader) == -1)
        {
          writer.close ();
          result = -1;
        }
    }

  // Close down the acceptor endpoint since we don't need it anymore.
  acceptor.close ();
  if (result == -1)
    return -1;

  this->handles_[0] = reader.get_handle ();
  this->handles_[1] = writer.get_handle ();

# if !defined (ACE_LACKS_TCP_NODELAY)
  int one = 1;

  // Make sure that the TCP stack doesn't try to buffer small writes.
  // Since this communication is purely local to the host it doesn't
  // affect network performance.

  if (writer.set_option (ACE_IPPROTO_TCP,
                         TCP_NODELAY,
                         &one,
                         sizeof one) == -1)
    {
      this->close ();
      return -1;
    }
# endif /* ! ACE_LACKS_TCP_NODELAY */

# if defined (ACE_LACKS_SOCKET_BUFSIZ)
    ACE_UNUSED_ARG (buffer_size);
# else  /* ! ACE_LACKS_SOCKET_BUFSIZ */
  if (reader.set_option (SOL_SOCKET,
                         SO_RCVBUF,
                         reinterpret_cast <void *> (&buffer_size),
                         sizeof (buffer_size)) == -1
      && errno != ENOTSUP)
    {
      this->close ();
      return -1;
    }
  else if (writer.set_option (SOL_SOCKET,
                              SO_SNDBUF,
                              reinterpret_cast <void *> (&buffer_size),
                              sizeof (buffer_size)) == -1
           && errno != ENOTSUP)
    {
      this->close ();
      return -1;
    }
# endif /* ! ACE_LACKS_SOCKET_BUFSIZ */

#elif defined (ACE_HAS_STREAM_PIPES) || defined (__QNX__)
  ACE_UNUSED_ARG (buffer_size);
  if (ACE_OS::pipe (this->handles_) == -1)
    ACE_ERROR_RETURN ((LM_ERROR,
                       ACE_TEXT ("%p\n"),
                       ACE_TEXT ("pipe")),
                      -1);

#if !defined(__QNX__)
  int arg = RMSGN;

  // Enable "msg no discard" mode, which ensures that record
  // boundaries are maintained when messages are sent and received.
  if (ACE_OS::ioctl (this->handles_[0],
                     I_SRDOPT,
                     (void *) arg) == -1
      || ACE_OS::ioctl (this->handles_[1],
                        I_SRDOPT,
                        (void *) arg) == -1)
    {
      this->close ();
      ACE_ERROR_RETURN ((LM_ERROR,
                         ACE_TEXT ("%p\n"),
                         ACE_TEXT ("ioctl")), -1);
    }
#endif /* __QNX__ */

#else  /* ! ACE_LACKS_SOCKETPAIR && ! ACE_HAS_STREAM_PIPES */
  if (ACE_OS::socketpair (AF_UNIX,
                          SOCK_STREAM,
                          0,
                          this->handles_) == -1)
    ACE_ERROR_RETURN ((LM_ERROR,
                       ACE_TEXT ("%p\n"),
                       ACE_TEXT ("socketpair")),
                      -1);
# if defined (ACE_LACKS_SOCKET_BUFSIZ)
  ACE_UNUSED_ARG (buffer_size);
# else  /* ! ACE_LACKS_SOCKET_BUFSIZ */
  if (ACE_OS::setsockopt (this->handles_[0],
                          SOL_SOCKET,
                          SO_RCVBUF,
                          reinterpret_cast <const char *> (&buffer_size),
                          sizeof (buffer_size)) == -1
      && errno != ENOTSUP)
    {
      this->close ();
      return -1;
    }
  if (ACE_OS::setsockopt (this->handles_[1],
                          SOL_SOCKET,
                          SO_SNDBUF,
                          reinterpret_cast <const char *> (&buffer_size),
                          sizeof (buffer_size)) == -1
      && errno != ENOTSUP)
    {
      this->close ();
      return -1;
    }
# endif /* ! ACE_LACKS_SOCKET_BUFSIZ */
# if defined (ACE_OPENVMS) && !defined (ACE_LACKS_TCP_NODELAY)
  int one = 1;
  // OpenVMS implements socketpair(AF_UNIX...) by returning AF_INET sockets.
  // Since these are plagued by Nagle as any other INET socket we need to set
  // TCP_NODELAY on the write handle.
  if (ACE_OS::setsockopt (this->handles_[1],
                          ACE_IPPROTO_TCP,
                          TCP_NODELAY,
                          reinterpret_cast <const char *> (&one),
                          sizeof (one)) == -1)
    {
      this->close ();
      return -1;
    }
# endif /* ACE_OPENVMS && !ACE_LACKS_TCP_NODELAY */
#endif  /* ! ACE_LACKS_SOCKETPAIR && ! ACE_HAS_STREAM_PIPES */
  // Point both the read and write HANDLES to the appropriate socket
  // HANDLEs.

  return 0;
}

int
ACE_Pipe::open (ACE_HANDLE handles[2])
{
  ACE_TRACE ("ACE_Pipe::open");

  if (this->open () == -1)
    return -1;
  else
    {
      handles[0] = this->handles_[0];
      handles[1] = this->handles_[1];
      return 0;
    }
}

// Do nothing...

ACE_Pipe::ACE_Pipe (void)
{
  ACE_TRACE ("ACE_Pipe::ACE_Pipe");

  this->handles_[0] = ACE_INVALID_HANDLE;
  this->handles_[1] = ACE_INVALID_HANDLE;
}

ACE_Pipe::ACE_Pipe (ACE_HANDLE handles[2])
{
  ACE_TRACE ("ACE_Pipe::ACE_Pipe");

  if (this->open (handles) == -1)
    ACE_ERROR ((LM_ERROR,
                ACE_TEXT ("ACE_Pipe::ACE_Pipe")));
}

ACE_Pipe::ACE_Pipe (ACE_HANDLE read,
                    ACE_HANDLE write)
{
  ACE_TRACE ("ACE_Pipe::ACE_Pipe");
  this->handles_[0] = read;
  this->handles_[1] = write;
}

int
ACE_Pipe::close (void)
{
  ACE_TRACE ("ACE_Pipe::close");

  int result = 0;

  // Note that the following will work even if we aren't closing down
  // sockets because <ACE_OS::closesocket> will just call <::close> in
  // that case!

  if (this->handles_[0] != ACE_INVALID_HANDLE)
    result = ACE_OS::closesocket (this->handles_[0]);
  this->handles_[0] = ACE_INVALID_HANDLE;

  if (this->handles_[1] != ACE_INVALID_HANDLE)
    result |= ACE_OS::closesocket (this->handles_[1]);
  this->handles_[1] = ACE_INVALID_HANDLE;

  return result;
}

// Send N char *ptrs and int lengths.  Note that the char *'s precede
// the ints (basically, an varargs version of writev).  The count N is
// the *total* number of trailing arguments, *not* a couple of the
// number of tuple pairs!

ssize_t
ACE_Pipe::send (size_t n, ...) const
{
  ACE_TRACE ("ACE_Pipe::send");
  va_list argp;
  int total_tuples = ACE_Utils::truncate_cast<int> (n / 2);
  iovec *iovp;
#if defined (ACE_HAS_ALLOCA)
  iovp = (iovec *) alloca (total_tuples * sizeof (iovec));
#else
  ACE_NEW_RETURN (iovp,
                  iovec[total_tuples],
                  -1);
#endif /* !defined (ACE_HAS_ALLOCA) */

  va_start (argp, n);

  for (int i = 0; i < total_tuples; ++i)
    {
      iovp[i].iov_base = va_arg (argp, char *);
      iovp[i].iov_len  = va_arg (argp, int);
    }

#if defined (ACE_WIN32)
  ssize_t result = ACE::sendv (this->write_handle (),
                               iovp,
                               total_tuples);
#else
  ssize_t result = ACE_OS::writev (this->write_handle (),
                                   iovp,
                                   total_tuples);
#endif /* ACE_WIN32 */

#if !defined (ACE_HAS_ALLOCA)
  delete [] iovp;
#endif /* !defined (ACE_HAS_ALLOCA) */
  va_end (argp);
  return result;
}

// This is basically an interface to ACE_OS::readv, that doesn't use
// the struct iovec explicitly.  The ... can be passed as an arbitrary
// number of (char *ptr, int len) tuples.  However, the count N is the
// *total* number of trailing arguments, *not* a couple of the number
// of tuple pairs!

ssize_t
ACE_Pipe::recv (size_t n, ...) const
{
  ACE_TRACE ("ACE_Pipe::recv");
  va_list argp;
  int total_tuples = ACE_Utils::truncate_cast<int> (n / 2);
  iovec *iovp;
#if defined (ACE_HAS_ALLOCA)
  iovp = (iovec *) alloca (total_tuples * sizeof (iovec));
#else
  ACE_NEW_RETURN (iovp,
                  iovec[total_tuples],
                  -1);
#endif /* !defined (ACE_HAS_ALLOCA) */

  va_start (argp, n);

  for (int i = 0; i < total_tuples; ++i)
    {
      iovp[i].iov_base = va_arg (argp, char *);
      iovp[i].iov_len  = va_arg (argp, int);
    }

#if defined (ACE_WIN32)
  ssize_t const result = ACE::recvv (this->read_handle (),
                                     iovp,
                                     total_tuples);
#else
  ssize_t const result = ACE_OS::readv (this->read_handle (),
                                        iovp,
                                        total_tuples);
#endif /* ACE_WIN32 */

#if !defined (ACE_HAS_ALLOCA)
  delete [] iovp;
#endif /* !defined (ACE_HAS_ALLOCA) */
  va_end (argp);
  return result;
}

ACE_END_VERSIONED_NAMESPACE_DECL

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