~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,

                     my_socket sd, HANDLE hPipe, uint flags)

{

  DBUG_ENTER("vio_init");

  DBUG_PRINT("enter", ("type: %d  sd: %d  flags: %d", type, sd, flags));

#ifndef HAVE_VIO_READ_BUFF

  flags&= ~VIO_BUFFERED_READ;

#endif

  bzero((char*) vio, sizeof(*vio));

  vio->type	= type;

  vio->sd	= sd;

  vio->hPipe	= hPipe;

  vio->localhost= flags & VIO_LOCALHOST;

  if ((flags & VIO_BUFFERED_READ) &&

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

    flags&= ~VIO_BUFFERED_READ;

#ifdef __WIN__ 

  if (type == VIO_TYPE_NAMEDPIPE)

  {

    vio->viodelete	=vio_delete;

    vio->vioerrno	=vio_errno;

    vio->read           =vio_read_pipe;

    vio->write          =vio_write_pipe;

    vio->fastsend	=vio_fastsend;

    vio->viokeepalive	=vio_keepalive;

    vio->should_retry	=vio_should_retry;

    vio->was_interrupted=vio_was_interrupted;

    vio->vioclose	=vio_close_pipe;

    vio->peer_addr	=vio_peer_addr;

    vio->vioblocking	=vio_blocking;

    vio->is_blocking	=vio_is_blocking;

    vio->timeout	=vio_ignore_timeout;

  }

  else					/* default is VIO_TYPE_TCPIP */

#endif

#ifdef HAVE_SMEM 

  if (type == VIO_TYPE_SHARED_MEMORY)

  {

    vio->viodelete	=vio_delete;

    vio->vioerrno	=vio_errno;

    vio->read           =vio_read_shared_memory;

    vio->write          =vio_write_shared_memory;

    vio->fastsend	=vio_fastsend;

    vio->viokeepalive	=vio_keepalive;

    vio->should_retry	=vio_should_retry;

    vio->was_interrupted=vio_was_interrupted;

    vio->vioclose	=vio_close_shared_memory;

    vio->peer_addr	=vio_peer_addr;

    vio->vioblocking	=vio_blocking;

    vio->is_blocking	=vio_is_blocking;

    vio->timeout	=vio_ignore_timeout;

  }

  else

#endif   

  {

    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;

  }

  DBUG_VOID_RETURN;

}

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

void vio_reset(Vio* vio, enum enum_vio_type type,

               my_socket sd, HANDLE hPipe, uint flags)

{

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

  vio_init(vio, type, sd, hPipe, flags);

}

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

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

{

  Vio *vio;

  DBUG_ENTER("vio_new");

  DBUG_PRINT("enter", ("sd: %d", sd));

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

  {

    vio_init(vio, type, sd, 0, flags);

    sprintf(vio->desc,

	    (vio->type == VIO_TYPE_SOCKET ? "socket (%d)" : "TCP/IP (%d)"),

	    vio->sd);

#if !defined(__WIN__)

#if !defined(NO_FCNTL_NONBLOCK)

    /*

      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);

#elif defined(HAVE_SYS_IOCTL_H)			/* hpux */

    /* Non blocking sockets doesn't work good on HPUX 11.0 */

    (void) ioctl(sd,FIOSNBIO,0);

    vio->fcntl_mode &= ~O_NONBLOCK;

#endif

#else /* !defined(__WIN__) */

    {

      /* set to blocking mode by default */

      ulong arg=0, r;

      r = ioctlsocket(sd,FIONBIO,(void*) &arg);

      vio->fcntl_mode &= ~O_NONBLOCK;

    }

#endif

  }

  DBUG_RETURN(vio);

}

#ifdef __WIN__

Vio *vio_new_win32pipe(HANDLE hPipe)

{

  Vio *vio;

  DBUG_ENTER("vio_new_handle");

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

  {

    vio_init(vio, VIO_TYPE_NAMEDPIPE, 0, hPipe, VIO_LOCALHOST);

    strmov(vio->desc, "named pipe");

  }

  DBUG_RETURN(vio);

}

#ifdef HAVE_SMEM

Vio *vio_new_win32shared_memory(NET *net,HANDLE handle_file_map, HANDLE handle_map,

                                HANDLE event_server_wrote, HANDLE event_server_read,

                                HANDLE event_client_wrote, HANDLE event_client_read,

                                HANDLE event_conn_closed)

{

  Vio *vio;

  DBUG_ENTER("vio_new_win32shared_memory");

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

  {

    vio_init(vio, VIO_TYPE_SHARED_MEMORY, 0, 0, VIO_LOCALHOST);

    vio->handle_file_map= handle_file_map;

    vio->handle_map= handle_map;

    vio->event_server_wrote= event_server_wrote;

    vio->event_server_read= event_server_read;

    vio->event_client_wrote= event_client_wrote;

    vio->event_client_read= event_client_read;

    vio->event_conn_closed= event_conn_closed;

    vio->shared_memory_remain= 0;

    vio->shared_memory_pos= handle_map;

    vio->net= net;

    strmov(vio->desc, "shared memory");

  }

  DBUG_RETURN(vio);

}

#endif

#endif

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)

{

}