~drizzle-trunk/drizzle/development

/* Copyright (C) 2000-2001, 2004 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 */

/*

  Logging of MyISAM commands and records on logfile for debugging

  The log can be examined with help of the myisamlog command.

*/

#include "myisamdef.h"

#if defined(MSDOS) || defined(__WIN__)

#include <fcntl.h>

#ifndef __WIN__

#include <process.h>

#endif

#endif

#ifdef VMS

#include <processes.h>

#endif

#undef GETPID					/* For HPUX */

#ifdef THREAD

#define GETPID() (log_type == 1 ? (long) myisam_pid : (long) my_thread_dbug_id())

#else

#define GETPID() myisam_pid

#endif

	/* Activate logging if flag is 1 and reset logging if flag is 0 */

static int log_type=0;

ulong myisam_pid=0;

int mi_log(int activate_log)

{

  int error=0;

  char buff[FN_REFLEN];

  DBUG_ENTER("mi_log");

  log_type=activate_log;

  if (activate_log)

  {

    if (!myisam_pid)

      myisam_pid=(ulong) getpid();

    if (myisam_log_file < 0)

    {

      if ((myisam_log_file = my_create(fn_format(buff,myisam_log_filename,

						"",".log",4),

				      0,(O_RDWR | O_BINARY | O_APPEND),MYF(0)))

	  < 0)

	DBUG_RETURN(my_errno);

    }

  }

  else if (myisam_log_file >= 0)

  {

    error=my_close(myisam_log_file,MYF(0)) ? my_errno : 0 ;

    myisam_log_file= -1;

  }

  DBUG_RETURN(error);

}

	/* Logging of records and commands on logfile */

	/* All logs starts with command(1) dfile(2) process(4) result(2) */

void _myisam_log(enum myisam_log_commands command, MI_INFO *info,

		 const uchar *buffert, uint length)

{

  uchar buff[11];

  int error,old_errno;

  ulong pid=(ulong) GETPID();

  old_errno=my_errno;

  bzero(buff,sizeof(buff));

  buff[0]=(char) command;

  mi_int2store(buff+1,info->dfile);

  mi_int4store(buff+3,pid);

  mi_int2store(buff+9,length);

  pthread_mutex_lock(&THR_LOCK_myisam);

  error=my_lock(myisam_log_file,F_WRLCK,0L,F_TO_EOF,MYF(MY_SEEK_NOT_DONE));

  VOID(my_write(myisam_log_file,buff,sizeof(buff),MYF(0)));

  VOID(my_write(myisam_log_file,buffert,length,MYF(0)));

  if (!error)

    error=my_lock(myisam_log_file,F_UNLCK,0L,F_TO_EOF,MYF(MY_SEEK_NOT_DONE));

  pthread_mutex_unlock(&THR_LOCK_myisam);

  my_errno=old_errno;

}

void _myisam_log_command(enum myisam_log_commands command, MI_INFO *info,

			 const uchar *buffert, uint length, int result)

{

  uchar buff[9];

  int error,old_errno;

  ulong pid=(ulong) GETPID();

  old_errno=my_errno;

  buff[0]=(char) command;

  mi_int2store(buff+1,info->dfile);

  mi_int4store(buff+3,pid);

  mi_int2store(buff+7,result);

  pthread_mutex_lock(&THR_LOCK_myisam);

  error=my_lock(myisam_log_file,F_WRLCK,0L,F_TO_EOF,MYF(MY_SEEK_NOT_DONE));

  VOID(my_write(myisam_log_file,buff,sizeof(buff),MYF(0)));

  if (buffert)

    VOID(my_write(myisam_log_file,buffert,length,MYF(0)));

  if (!error)

    error=my_lock(myisam_log_file,F_UNLCK,0L,F_TO_EOF,MYF(MY_SEEK_NOT_DONE));

  pthread_mutex_unlock(&THR_LOCK_myisam);

  my_errno=old_errno;

}

void _myisam_log_record(enum myisam_log_commands command, MI_INFO *info,

			const uchar *record, my_off_t filepos, int result)

{

  uchar buff[21],*pos;

  int error,old_errno;

  uint length;

  ulong pid=(ulong) GETPID();

  old_errno=my_errno;

  if (!info->s->base.blobs)

    length=info->s->base.reclength;

  else

    length=info->s->base.reclength+ _my_calc_total_blob_length(info,record);

  buff[0]=(uchar) command;

  mi_int2store(buff+1,info->dfile);

  mi_int4store(buff+3,pid);

  mi_int2store(buff+7,result);

  mi_sizestore(buff+9,filepos);

  mi_int4store(buff+17,length);

  pthread_mutex_lock(&THR_LOCK_myisam);

  error=my_lock(myisam_log_file,F_WRLCK,0L,F_TO_EOF,MYF(MY_SEEK_NOT_DONE));

  VOID(my_write(myisam_log_file, buff,sizeof(buff),MYF(0)));

  VOID(my_write(myisam_log_file, record,info->s->base.reclength,MYF(0)));

  if (info->s->base.blobs)

  {

    MI_BLOB *blob,*end;

    for (end=info->blobs+info->s->base.blobs, blob= info->blobs;

	 blob != end ;

	 blob++)

    {

      memcpy_fixed((uchar*) &pos, record+blob->offset+blob->pack_length,

                   sizeof(char*));

      VOID(my_write(myisam_log_file,pos,blob->length,MYF(0)));

    }

  }

  if (!error)

    error=my_lock(myisam_log_file,F_UNLCK,0L,F_TO_EOF,MYF(MY_SEEK_NOT_DONE));

  pthread_mutex_unlock(&THR_LOCK_myisam);

  my_errno=old_errno;

}