~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"

int vio_errno(Vio *vio __attribute__((unused)))

{

  return socket_errno;		/* On Win32 this mapped to WSAGetLastError() */

}

size_t vio_read(Vio * vio, uchar* buf, size_t size)

{

  size_t r;

  DBUG_ENTER("vio_read");

  DBUG_PRINT("enter", ("sd: %d  buf: 0x%lx  size: %u", vio->sd, (long) buf,

                       (uint) size));

  /* Ensure nobody uses vio_read_buff and vio_read simultaneously */

  DBUG_ASSERT(vio->read_end == vio->read_pos);

  errno=0;					/* For linux */

  r = read(vio->sd, buf, size);

#ifndef DBUG_OFF

  if (r == (size_t) -1)

  {

    DBUG_PRINT("vio_error", ("Got error %d during read",errno));

  }

#endif /* DBUG_OFF */

  DBUG_PRINT("exit", ("%ld", (long) r));

  DBUG_RETURN(r);

}

/*

  Buffered read: if average read size is small it may

  reduce number of syscalls.

*/

size_t vio_read_buff(Vio *vio, uchar* buf, size_t size)

{

  size_t rc;

#define VIO_UNBUFFERED_READ_MIN_SIZE 2048

  DBUG_ENTER("vio_read_buff");

  DBUG_PRINT("enter", ("sd: %d  buf: 0x%lx  size: %u", vio->sd, (long) buf,

                       (uint) size));

  if (vio->read_pos < vio->read_end)

  {

    rc= min((size_t) (vio->read_end - vio->read_pos), size);

    memcpy(buf, vio->read_pos, rc);

    vio->read_pos+= rc;

    /*

      Do not try to read from the socket now even if rc < size:

      vio_read can return -1 due to an error or non-blocking mode, and

      the safest way to handle it is to move to a separate branch.

    */

  }

  else if (size < VIO_UNBUFFERED_READ_MIN_SIZE)

  {

    rc= vio_read(vio, (uchar*) vio->read_buffer, VIO_READ_BUFFER_SIZE);

    if (rc != 0 && rc != (size_t) -1)

    {

      if (rc > size)

      {

        vio->read_pos= vio->read_buffer + size;

        vio->read_end= vio->read_buffer + rc;

        rc= size;

      }

      memcpy(buf, vio->read_buffer, rc);

    }

  }

  else

    rc= vio_read(vio, buf, size);

  DBUG_RETURN(rc);

#undef VIO_UNBUFFERED_READ_MIN_SIZE

}

size_t vio_write(Vio * vio, const uchar* buf, size_t size)

{

  size_t r;

  DBUG_ENTER("vio_write");

  DBUG_PRINT("enter", ("sd: %d  buf: 0x%lx  size: %u", vio->sd, (long) buf,

                       (uint) size));

  r = write(vio->sd, buf, size);

#ifndef DBUG_OFF

  if (r == (size_t) -1)

  {

    DBUG_PRINT("vio_error", ("Got error on write: %d",socket_errno));

  }

#endif /* DBUG_OFF */

  DBUG_PRINT("exit", ("%u", (uint) r));

  DBUG_RETURN(r);

}

int vio_blocking(Vio * vio __attribute__((unused)), my_bool set_blocking_mode,

		 my_bool *old_mode)

{

  int r=0;

  DBUG_ENTER("vio_blocking");

  *old_mode= test(!(vio->fcntl_mode & O_NONBLOCK));

  DBUG_PRINT("enter", ("set_blocking_mode: %d  old_mode: %d",

		       (int) set_blocking_mode, (int) *old_mode));

#if !defined(NO_FCNTL_NONBLOCK)

  if (vio->sd >= 0)

  {

    int old_fcntl=vio->fcntl_mode;

    if (set_blocking_mode)

      vio->fcntl_mode &= ~O_NONBLOCK; /* clear bit */

    else

      vio->fcntl_mode |= O_NONBLOCK; /* set bit */

    if (old_fcntl != vio->fcntl_mode)

    {

      r= fcntl(vio->sd, F_SETFL, vio->fcntl_mode);

      if (r == -1)

      {

        DBUG_PRINT("info", ("fcntl failed, errno %d", errno));

        vio->fcntl_mode= old_fcntl;

      }

    }

  }

#else

  r= set_blocking_mode ? 0 : 1;

#endif /* !defined(NO_FCNTL_NONBLOCK) */

  DBUG_PRINT("exit", ("%d", r));

  DBUG_RETURN(r);

}

my_bool

vio_is_blocking(Vio * vio)

{

  my_bool r;

  DBUG_ENTER("vio_is_blocking");

  r = !(vio->fcntl_mode & O_NONBLOCK);

  DBUG_PRINT("exit", ("%d", (int) r));

  DBUG_RETURN(r);

}

int vio_fastsend(Vio * vio __attribute__((unused)))

{

  int r=0;

  DBUG_ENTER("vio_fastsend");

#if defined(IPTOS_THROUGHPUT)

  {

    int tos = IPTOS_THROUGHPUT;

    r= setsockopt(vio->sd, IPPROTO_IP, IP_TOS, (void *) &tos, sizeof(tos));

  }

#endif                                    /* IPTOS_THROUGHPUT */

  if (!r)

  {

    int nodelay = 1;

    r= setsockopt(vio->sd, IPPROTO_TCP, TCP_NODELAY,

                  IF_WIN(const char*, void*) &nodelay,

                  sizeof(nodelay));

  }

  if (r)

  {

    DBUG_PRINT("warning", ("Couldn't set socket option for fast send"));

    r= -1;

  }

  DBUG_PRINT("exit", ("%d", r));

  DBUG_RETURN(r);

}

int vio_keepalive(Vio* vio, my_bool set_keep_alive)

{

  int r=0;

  uint opt = 0;

  DBUG_ENTER("vio_keepalive");

  DBUG_PRINT("enter", ("sd: %d  set_keep_alive: %d", vio->sd, (int)

		       set_keep_alive));

  if (vio->type != VIO_TYPE_NAMEDPIPE)

  {

    if (set_keep_alive)

      opt = 1;

    r = setsockopt(vio->sd, SOL_SOCKET, SO_KEEPALIVE, (char *) &opt,

		   sizeof(opt));

  }

  DBUG_RETURN(r);

}

my_bool

vio_should_retry(Vio * vio __attribute__((unused)))

{

  int en = socket_errno;

  return (en == SOCKET_EAGAIN || en == SOCKET_EINTR ||

	  en == SOCKET_EWOULDBLOCK);

}

my_bool

vio_was_interrupted(Vio *vio __attribute__((unused)))

{

  int en= socket_errno;

  return (en == SOCKET_EAGAIN || en == SOCKET_EINTR ||

	  en == SOCKET_EWOULDBLOCK || en == SOCKET_ETIMEDOUT);

}

int vio_close(Vio * vio)

{

  int r=0;

  DBUG_ENTER("vio_close");

 if (vio->type != VIO_CLOSED)

  {

    DBUG_ASSERT(vio->sd >= 0);

    if (shutdown(vio->sd, SHUT_RDWR))

      r= -1;

    if (closesocket(vio->sd))

      r= -1;

  }

  if (r)

  {

    DBUG_PRINT("vio_error", ("close() failed, error: %d",socket_errno));

    /* FIXME: error handling (not critical for MySQL) */

  }

  vio->type= VIO_CLOSED;

  vio->sd=   -1;

  DBUG_RETURN(r);

}

const char *vio_description(Vio * vio)

{

  return vio->desc;

}

enum enum_vio_type vio_type(Vio* vio)

{

  return vio->type;

}

my_socket vio_fd(Vio* vio)

{

  return vio->sd;

}

my_bool vio_peer_addr(Vio *vio, char *buf, uint16 *port, size_t buflen)

{

  DBUG_ENTER("vio_peer_addr");

  DBUG_PRINT("enter", ("sd: %d", vio->sd));

  if (vio->localhost)

  {

    strmov(buf, "127.0.0.1");

    *port= 0;

  }

  else

  {

    int error;

    char port_buf[NI_MAXSERV];

    size_socket addrLen = sizeof(vio->remote);

    if (getpeername(vio->sd, (struct sockaddr *) (&vio->remote),

                    &addrLen) != 0)

    {

      DBUG_PRINT("exit", ("getpeername gave error: %d", socket_errno));

      DBUG_RETURN(1);

    }

    vio->addrLen= (int)addrLen;

    if ((error= getnameinfo((struct sockaddr *)(&vio->remote), 

                            addrLen,

                            buf, buflen,

                            port_buf, NI_MAXSERV, NI_NUMERICHOST|NI_NUMERICSERV)))

    {

      DBUG_PRINT("exit", ("getnameinfo gave error: %s", 

                          gai_strerror(error)));

      DBUG_RETURN(1);

    }

    *port= (uint16)strtol(port_buf, (char **)NULL, 10);

    /*

      A lot of users do not have IPv6 loopback resolving to localhost

      correctly setup. Should this exist? No. If we do not do it though

      we will be getting a lot of support questions from users who

      have bad setups. This code should be removed by say... 2012.

        -Brian

    */

    if (!memcmp(buf, "::ffff:127.0.0.1", sizeof("::ffff:127.0.0.1")))

      strmov(buf, "127.0.0.1");

  }

  DBUG_PRINT("exit", ("addr: %s", buf));

  DBUG_RETURN(0);

}

/* Return 0 if there is data to be read */

my_bool vio_poll_read(Vio *vio,uint timeout)

{

#if defined(HAVE_POLL)

  struct pollfd fds;

  int res;

  DBUG_ENTER("vio_poll");

  fds.fd=vio->sd;

  fds.events=POLLIN;

  fds.revents=0;

  if ((res=poll(&fds,1,(int) timeout*1000)) <= 0)

  {

    DBUG_RETURN(res < 0 ? 0 : 1);		/* Don't return 1 on errors */

  }

  DBUG_RETURN(fds.revents & (POLLIN | POLLERR | POLLHUP) ? 0 : 1);

#else

  return 0;

#endif

}

my_bool vio_peek_read(Vio *vio, uint *bytes)

{

#if FIONREAD_IN_SYS_IOCTL

  int len;

  if (ioctl(vio->sd, FIONREAD, &len) < 0)

    return TRUE;

  *bytes= len;

  return FALSE;

#else

  char buf[1024];

  ssize_t res= recv(vio->sd, &buf, sizeof(buf), MSG_PEEK);

  if (res < 0)

    return TRUE;

  *bytes= res;

  return FALSE;

#endif

}

void vio_timeout(Vio *vio, uint which, uint timeout)

{

#if defined(SO_SNDTIMEO) && defined(SO_RCVTIMEO)

  int r;

  DBUG_ENTER("vio_timeout");

  {

  /* POSIX specifies time as struct timeval. */

  struct timeval wait_timeout;

  wait_timeout.tv_sec= timeout;

  wait_timeout.tv_usec= 0;

  r= setsockopt(vio->sd, SOL_SOCKET, which ? SO_SNDTIMEO : SO_RCVTIMEO,

                IF_WIN(const char*, const void*)&wait_timeout,

                sizeof(wait_timeout));

  }

#ifndef DBUG_OFF

  if (r != 0)

    DBUG_PRINT("error", ("setsockopt failed: %d, errno: %d", r, socket_errno));

#endif

  DBUG_VOID_RETURN;

#else

/*

  Platforms not suporting setting of socket timeout should either use

  thr_alarm or just run without read/write timeout(s)

*/

#endif

}