~drizzle-trunk/drizzle/development

/* Copyright (C) 2000 MySQL AB

   This program is free software; you can redistribute it and/or modify

   it under the terms of the GNU General Public License as published by

   the Free Software Foundation; version 2 of the License.

   This program is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License

   along with this program; if not, write to the Free Software

   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */

/*

  Note that we can't have assertion on file descriptors;  The reason for

  this is that during mysql shutdown, another thread can close a file

  we are working on.  In this case we should just return read errors from

  the file descriptior.

*/

#include "vio_priv.h"

/*

 * Helper to fill most of the Vio* with defaults.

 */

static void vio_init(Vio* vio, enum enum_vio_type type,

                     int sd, uint32_t flags)

{

#ifndef HAVE_VIO_READ_BUFF

  flags&= ~VIO_BUFFERED_READ;

#endif

  memset(vio, 0, sizeof(*vio));

  vio->type	= type;

  vio->sd	= sd;

  if ((flags & VIO_BUFFERED_READ) &&

      !(vio->read_buffer= (char*)my_malloc(VIO_READ_BUFFER_SIZE, MYF(MY_WME))))

    flags&= ~VIO_BUFFERED_READ;

  {

    vio->viodelete	=vio_delete;

    vio->vioerrno	=vio_errno;

    vio->read= (flags & VIO_BUFFERED_READ) ? vio_read_buff : vio_read;

    vio->write		=vio_write;

    vio->fastsend	=vio_fastsend;

    vio->viokeepalive	=vio_keepalive;

    vio->should_retry	=vio_should_retry;

    vio->was_interrupted=vio_was_interrupted;

    vio->vioclose	=vio_close;

    vio->peer_addr	=vio_peer_addr;

    vio->vioblocking	=vio_blocking;

    vio->is_blocking	=vio_is_blocking;

    vio->timeout	=vio_timeout;

  }

}

/* Reset initialized VIO to use with another transport type */

void vio_reset(Vio* vio, enum enum_vio_type type,

               int sd, uint flags)

{

  my_free(vio->read_buffer, MYF(MY_ALLOW_ZERO_PTR));

  vio_init(vio, type, sd, flags);

}

/* Open the socket or TCP/IP connection and read the fnctl() status */

Vio *vio_new(int sd, enum enum_vio_type type, uint flags)

{

  Vio *vio;

  if ((vio = (Vio*) my_malloc(sizeof(*vio),MYF(MY_WME))))

  {

    vio_init(vio, type, sd, flags);

    sprintf(vio->desc, "TCP/IP (%d)", vio->sd);

    /*

      We call fcntl() to set the flags and then immediately read them back

      to make sure that we and the system are in agreement on the state of

      things.

      An example of why we need to do this is FreeBSD (and apparently some

      other BSD-derived systems, like Mac OS X), where the system sometimes

      reports that the socket is set for non-blocking when it really will

      block.

    */

    fcntl(sd, F_SETFL, 0);

    vio->fcntl_mode= fcntl(sd, F_GETFL);

  }

  return vio;

}

void vio_delete(Vio* vio)

{

  if (!vio)

    return; /* It must be safe to delete null pointers. */

  if (vio->type != VIO_CLOSED)

    vio->vioclose(vio);

  my_free((uchar*) vio->read_buffer, MYF(MY_ALLOW_ZERO_PTR));

  my_free((uchar*) vio, MYF(0));

}

/*

  Cleanup memory allocated by vio or the

  components below it when application finish

*/

void vio_end(void)

{

}