~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 */

#include "mysys_priv.h"

#include "mysys_err.h"

#include <my_dir.h>

#include <errno.h>

/*

  Open a file

  SYNOPSIS

    my_open()

      FileName	Fully qualified file name

      Flags	Read | write 

      MyFlags	Special flags

  RETURN VALUE

    File descriptor

*/

File my_open(const char *FileName, int Flags, myf MyFlags)

				/* Path-name of file */

				/* Read | write .. */

				/* Special flags */

{

  File fd;

  DBUG_ENTER("my_open");

  DBUG_PRINT("my",("Name: '%s'  Flags: %d  MyFlags: %d",

		   FileName, Flags, MyFlags));

#if !defined(NO_OPEN_3)

  fd = open(FileName, Flags, my_umask);	/* Normal unix */

#else

  fd = open((char *) FileName, Flags);

#endif

  DBUG_RETURN(my_register_filename(fd, FileName, FILE_BY_OPEN,

				   EE_FILENOTFOUND, MyFlags));

} /* my_open */

/*

  Close a file

  SYNOPSIS

    my_close()

      fd	File sescriptor

      myf	Special Flags

*/

int my_close(File fd, myf MyFlags)

{

  int err;

  DBUG_ENTER("my_close");

  DBUG_PRINT("my",("fd: %d  MyFlags: %d",fd, MyFlags));

  pthread_mutex_lock(&THR_LOCK_open);

  do

  {

    err= close(fd);

  } while (err == -1 && errno == EINTR);

  if (err)

  {

    DBUG_PRINT("error",("Got error %d on close",err));

    my_errno=errno;

    if (MyFlags & (MY_FAE | MY_WME))

      my_error(EE_BADCLOSE, MYF(ME_BELL+ME_WAITTANG),my_filename(fd),errno);

  }

  if ((uint) fd < my_file_limit && my_file_info[fd].type != UNOPEN)

  {

    my_free(my_file_info[fd].name, MYF(0));

#if defined(THREAD) && !defined(HAVE_PREAD)

    pthread_mutex_destroy(&my_file_info[fd].mutex);

#endif

    my_file_info[fd].type = UNOPEN;

  }

  my_file_opened--;

  pthread_mutex_unlock(&THR_LOCK_open);

  DBUG_RETURN(err);

} /* my_close */

/*

  Register file in my_file_info[]

  SYNOPSIS

    my_register_filename()

    fd			   File number opened, -1 if error on open

    FileName		   File name

    type_file_type	   How file was created

    error_message_number   Error message number if caller got error (fd == -1)

    MyFlags		   Flags for my_close()

  RETURN

    -1   error

     #   Filenumber

*/

File my_register_filename(File fd, const char *FileName, enum file_type

			  type_of_file, uint error_message_number, myf MyFlags)

{

  DBUG_ENTER("my_register_filename");

  if ((int) fd >= 0)

  {

    if ((uint) fd >= my_file_limit)

    {

#if defined(THREAD) && !defined(HAVE_PREAD)

      my_errno= EMFILE;

#else

      thread_safe_increment(my_file_opened,&THR_LOCK_open);

      DBUG_RETURN(fd);				/* safeguard */

#endif

    }

    else

    {

      pthread_mutex_lock(&THR_LOCK_open);

      if ((my_file_info[fd].name = (char*) my_strdup(FileName,MyFlags)))

      {

        my_file_opened++;

        my_file_total_opened++;

        my_file_info[fd].type = type_of_file;

#if defined(THREAD) && !defined(HAVE_PREAD)

        pthread_mutex_init(&my_file_info[fd].mutex,MY_MUTEX_INIT_FAST);

#endif

        pthread_mutex_unlock(&THR_LOCK_open);

        DBUG_PRINT("exit",("fd: %d",fd));

        DBUG_RETURN(fd);

      }

      pthread_mutex_unlock(&THR_LOCK_open);

      my_errno= ENOMEM;

    }

    (void) my_close(fd, MyFlags);

  }

  else

    my_errno= errno;

  DBUG_PRINT("error",("Got error %d on open", my_errno));

  if (MyFlags & (MY_FFNF | MY_FAE | MY_WME))

  {

    if (my_errno == EMFILE)

      error_message_number= EE_OUT_OF_FILERESOURCES;

    DBUG_PRINT("error",("print err: %d",error_message_number));

    my_error(error_message_number, MYF(ME_BELL+ME_WAITTANG),

             FileName, my_errno);

  }

  DBUG_RETURN(-1);

}

#ifdef EXTRA_DEBUG

void my_print_open_files(void)

{

  if (my_file_opened | my_stream_opened)

  {

    uint i;

    for (i= 0 ; i < my_file_limit ; i++)

    {

      if (my_file_info[i].type != UNOPEN)

      {

        fprintf(stderr, EE(EE_FILE_NOT_CLOSED), my_file_info[i].name, i);

        fputc('\n', stderr);

      }

    }

  }

}

#endif