my_open.c 4.51 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13
/* Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.

   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
14
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335  USA */
15 16 17

#include "mysys_priv.h"
#include "mysys_err.h"
18
#include <m_string.h>
19 20
#include <errno.h>

21 22 23 24 25
CREATE_NOSYMLINK_FUNCTION(
  open_nosymlinks(const char *pathname, int flags, int mode),
  openat(dfd, filename, O_NOFOLLOW | flags, mode),
  open(pathname, O_NOFOLLOW | flags, mode)
);
26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53

/*
  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: %lu",
		   FileName, Flags, MyFlags));
  if (!(MyFlags & (MY_WME | MY_FAE | MY_FFNF)))
    MyFlags|= my_global_flags;
#if defined(_WIN32)
  fd= my_win_open(FileName, Flags);
#else
54 55 56 57
  if (MyFlags & MY_NOSYMLINKS)
    fd = open_nosymlinks(FileName, Flags | O_CLOEXEC, my_umask);
  else
    fd = open(FileName, Flags | O_CLOEXEC, my_umask);
58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139
#endif

  fd= my_register_filename(fd, FileName, FILE_BY_OPEN,
			   EE_FILENOTFOUND, MyFlags);
  DBUG_RETURN(fd);
} /* 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: %lu",fd, MyFlags));
  if (!(MyFlags & (MY_WME | MY_FAE)))
    MyFlags|= my_global_flags;

  mysql_mutex_lock(&THR_LOCK_open);
#ifndef _WIN32
  do
  {
    err= close(fd);
  } while (err == -1 && errno == EINTR);
#else
  err= my_win_close(fd);
#endif
  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 | (MyFlags & (ME_JUST_INFO | ME_NOREFRESH))),
               my_filename(fd),errno);
  }
  if ((uint) fd < my_file_limit && my_file_info[fd].type != UNOPEN)
  {
    my_free(my_file_info[fd].name);
    my_file_info[fd].type = UNOPEN;
  }
  my_file_opened--;
  mysql_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 >= MY_FILE_MIN)
  {
    if ((uint) fd >= my_file_limit)
    {
      thread_safe_increment(my_file_opened,&THR_LOCK_open);
      DBUG_RETURN(fd);				/* safeguard */
    }
140 141 142 143 144 145 146 147
    mysql_mutex_lock(&THR_LOCK_open);
    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;
    mysql_mutex_unlock(&THR_LOCK_open);
    DBUG_PRINT("exit",("fd: %d",fd));
    DBUG_RETURN(fd);
148
  }
149
  my_errno= errno;
150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184

  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;
    my_error(error_message_number,
             MYF(ME_BELL | ME_WAITTANG | (MyFlags & (ME_JUST_INFO | ME_NOREFRESH))),
             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