Skip navigation links

 Systems for MySQL

The world's most popular open source database

Contact a MySQL Representative

Login | Register

• MySQL.com
• Developer Zone
• Partners & Solutions
• Customer Login

• DevZone
• Downloads
• Documentation
• Articles
• Forums
• Bugs
• Forge
• Blogs

 

---

Learn about new MySQL releases, technical articles, events and more.

Subscribe Now »

mysql/src/5.1-dbg/include/my_sys.h

Go to the documentation of this file.

/* Copyright (C) 2000-2003 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; either version 2 of the License, or
   (at your option) any later version.

   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 */

#ifndef _my_sys_h
#define _my_sys_h
C_MODE_START

#ifdef HAVE_AIOWAIT
#include <sys/asynch.h>                 /* Used by record-cache */
typedef struct my_aio_result {
  aio_result_t result;
  int          pending;
} my_aio_result;
#endif

#ifndef THREAD
extern int NEAR my_errno;               /* Last error in mysys */
#else
#include <my_pthread.h>
#endif

#ifndef _m_ctype_h
#include <m_ctype.h>                    /* for CHARSET_INFO */
#endif

#include <stdarg.h>
#include <typelib.h>

#define MYSYS_PROGRAM_USES_CURSES()  { error_handler_hook = my_message_curses;  mysys_uses_curses=1; }
#define MYSYS_PROGRAM_DONT_USE_CURSES()  { error_handler_hook = my_message_no_curses; mysys_uses_curses=0;}
#define MY_INIT(name);          { my_progname= name; my_init(); }

#define ERRMSGSIZE      (SC_MAXWIDTH)   /* Max length of a error message */
#define NRERRBUFFS      (2)     /* Buffers for parameters */
#define MY_FILE_ERROR   ((uint) ~0)

        /* General bitmaps for my_func's */
#define MY_FFNF         1       /* Fatal if file not found */
#define MY_FNABP        2       /* Fatal if not all bytes read/writen */
#define MY_NABP         4       /* Error if not all bytes read/writen */
#define MY_FAE          8       /* Fatal if any error */
#define MY_WME          16      /* Write message on error */
#define MY_WAIT_IF_FULL 32      /* Wait and try again if disk full error */
#define MY_IGNORE_BADFD 32      /* my_sync: ignore 'bad descriptor' errors */
#define MY_RAID         64      /* Support for RAID */
#define MY_FULL_IO     512      /* For my_read - loop intil I/O is complete */
#define MY_DONT_CHECK_FILESIZE 128 /* Option to init_io_cache() */
#define MY_LINK_WARNING 32      /* my_redel() gives warning if links */
#define MY_COPYTIME     64      /* my_redel() copys time */
#define MY_DELETE_OLD   256     /* my_create_with_symlink() */
#define MY_RESOLVE_LINK 128     /* my_realpath(); Only resolve links */
#define MY_HOLD_ORIGINAL_MODES 128  /* my_copy() holds to file modes */
#define MY_REDEL_MAKE_BACKUP 256
#define MY_SEEK_NOT_DONE 32     /* my_lock may have to do a seek */
#define MY_DONT_WAIT    64      /* my_lock() don't wait if can't lock */
#define MY_ZEROFILL     32      /* my_malloc(), fill array with zero */
#define MY_ALLOW_ZERO_PTR 64    /* my_realloc() ; zero ptr -> malloc */
#define MY_FREE_ON_ERROR 128    /* my_realloc() ; Free old ptr on error */
#define MY_HOLD_ON_ERROR 256    /* my_realloc() ; Return old ptr on error */
#define MY_THREADSAFE   128     /* pread/pwrite:  Don't allow interrupts */
#define MY_DONT_OVERWRITE_FILE 1024     /* my_copy: Don't overwrite file */

#define MY_CHECK_ERROR  1       /* Params to my_end; Check open-close */
#define MY_GIVE_INFO    2       /* Give time info about process*/
#define MY_DONT_FREE_DBUG 4     /* Do not call DBUG_END() in my_end() */

#define MY_REMOVE_NONE    0     /* Params for modify_defaults_file */
#define MY_REMOVE_OPTION  1
#define MY_REMOVE_SECTION 2

#define ME_HIGHBYTE     8       /* Shift for colours */
#define ME_NOCUR        1       /* Don't use curses message */
#define ME_OLDWIN       2       /* Use old window */
#define ME_BELL         4       /* Ring bell then printing message */
#define ME_HOLDTANG     8       /* Don't delete last keys */
#define ME_WAITTOT      16      /* Wait for errtime secs of for a action */
#define ME_WAITTANG     32      /* Wait for a user action  */
#define ME_NOREFRESH    64      /* Dont refresh screen */
#define ME_NOINPUT      128     /* Dont use the input libary */
#define ME_COLOUR1      ((1 << ME_HIGHBYTE))    /* Possibly error-colours */
#define ME_COLOUR2      ((2 << ME_HIGHBYTE))
#define ME_COLOUR3      ((3 << ME_HIGHBYTE))

        /* Bits in last argument to fn_format */
#define MY_REPLACE_DIR          1       /* replace dir in name with 'dir' */
#define MY_REPLACE_EXT          2       /* replace extension with 'ext' */
#define MY_UNPACK_FILENAME      4       /* Unpack name (~ -> home) */
#define MY_PACK_FILENAME        8       /* Pack name (home -> ~) */
#define MY_RESOLVE_SYMLINKS     16      /* Resolve all symbolic links */
#define MY_RETURN_REAL_PATH     32      /* return full path for file */
#define MY_SAFE_PATH            64      /* Return NULL if too long path */
#define MY_RELATIVE_PATH        128     /* name is relative to 'dir' */
#define MY_APPEND_EXT           256     /* add 'ext' as additional extension*/


        /* My seek flags */
#define MY_SEEK_SET     0
#define MY_SEEK_CUR     1
#define MY_SEEK_END     2

        /* Some constants */
#define MY_WAIT_FOR_USER_TO_FIX_PANIC   60      /* in seconds */
#define MY_WAIT_GIVE_USER_A_MESSAGE     10      /* Every 10 times of prev */
#define MIN_COMPRESS_LENGTH             50      /* Don't compress small bl. */
#define DFLT_INIT_HITS  3

        /* root_alloc flags */
#define MY_KEEP_PREALLOC        1
#define MY_MARK_BLOCKS_FREE     2  /* move used to free list and reuse them */

        /* Internal error numbers (for assembler functions) */
#define MY_ERRNO_EDOM           33
#define MY_ERRNO_ERANGE         34

        /* Bits for get_date timeflag */
#define GETDATE_DATE_TIME       1
#define GETDATE_SHORT_DATE      2
#define GETDATE_HHMMSSTIME      4
#define GETDATE_GMT             8
#define GETDATE_FIXEDLENGTH     16

        /* defines when allocating data */
#ifdef SAFEMALLOC
#define my_malloc(SZ,FLAG) _mymalloc((SZ), __FILE__, __LINE__, FLAG )
#define my_malloc_ci(SZ,FLAG) _mymalloc((SZ), sFile, uLine, FLAG )
#define my_realloc(PTR,SZ,FLAG) _myrealloc((PTR), (SZ), __FILE__, __LINE__, FLAG )
#define my_checkmalloc() _sanity( __FILE__, __LINE__ )
#define my_free(PTR,FLAG) _myfree((PTR), __FILE__, __LINE__,FLAG)
#define my_memdup(A,B,C) _my_memdup((A),(B), __FILE__,__LINE__,C)
#define my_strdup(A,C) _my_strdup((A), __FILE__,__LINE__,C)
#define my_strndup(A,B,C) _my_strndup((A),(B),__FILE__,__LINE__,C)
#define TRASH(A,B) bfill(A, B, 0x8F)
#define QUICK_SAFEMALLOC sf_malloc_quick=1
#define NORMAL_SAFEMALLOC sf_malloc_quick=0
extern uint sf_malloc_prehunc,sf_malloc_endhunc,sf_malloc_quick;
extern ulonglong sf_malloc_mem_limit;

#define CALLER_INFO_PROTO   , const char *sFile, uint uLine
#define CALLER_INFO         , __FILE__, __LINE__
#define ORIG_CALLER_INFO    , sFile, uLine
#else
#define my_checkmalloc()
#undef TERMINATE
#define TERMINATE(A) {}
#define QUICK_SAFEMALLOC
#define NORMAL_SAFEMALLOC
extern gptr my_malloc(uint Size,myf MyFlags);
#define my_malloc_ci(SZ,FLAG) my_malloc( SZ, FLAG )
extern gptr my_realloc(gptr oldpoint,uint Size,myf MyFlags);
extern void my_no_flags_free(gptr ptr);
extern gptr my_memdup(const byte *from,uint length,myf MyFlags);
extern char *my_strdup(const char *from,myf MyFlags);
extern char *my_strndup(const char *from, uint length,
                                   myf MyFlags);
/* we do use FG (as a no-op) in below so that a typo on FG is caught */
#define my_free(PTR,FG) ((void)FG,my_no_flags_free(PTR))
#define CALLER_INFO_PROTO   /* nothing */
#define CALLER_INFO         /* nothing */
#define ORIG_CALLER_INFO    /* nothing */
#define TRASH(A,B) /* nothing */
#endif

#ifdef HAVE_LARGE_PAGES
extern uint my_get_large_page_size(void);
extern gptr my_large_malloc(uint size, myf my_flags);
extern void my_large_free(gptr ptr, myf my_flags);
#else
#define my_get_large_page_size() (0)
#define my_large_malloc(A,B) my_malloc_lock((A),(B))
#define my_large_free(A,B) my_free_lock((A),(B))
#endif /* HAVE_LARGE_PAGES */

#ifdef HAVE_ALLOCA
#if defined(_AIX) && !defined(__GNUC__) && !defined(_AIX43)
#pragma alloca
#endif /* _AIX */
#if defined(__MWERKS__)
#undef alloca
#define alloca _alloca
#endif /* __MWERKS__ */
#if defined(__GNUC__) && !defined(HAVE_ALLOCA_H) && ! defined(alloca)
#define alloca __builtin_alloca
#endif /* GNUC */
#define my_alloca(SZ) alloca((size_t) (SZ))
#define my_afree(PTR) {}
#else
#define my_alloca(SZ) my_malloc(SZ,MYF(0))
#define my_afree(PTR) my_free(PTR,MYF(MY_WME))
#endif /* HAVE_ALLOCA */

#ifndef errno                           /* did we already get it? */
#ifdef HAVE_ERRNO_AS_DEFINE
#include <errno.h>                      /* errno is a define */
#else
extern int errno;                       /* declare errno */
#endif
#endif                                  /* #ifndef errno */
extern char NEAR errbuff[NRERRBUFFS][ERRMSGSIZE];
extern char *home_dir;                  /* Home directory for user */
extern const char *my_progname;         /* program-name (printed in errors) */
extern char NEAR curr_dir[];            /* Current directory for user */
extern int (*error_handler_hook)(uint my_err, const char *str,myf MyFlags);
extern int (*fatal_error_handler_hook)(uint my_err, const char *str,
                                       myf MyFlags);
extern uint my_file_limit;

#ifdef HAVE_LARGE_PAGES
extern my_bool my_use_large_pages;
extern uint    my_large_page_size;
#endif

/* charsets */
extern CHARSET_INFO *default_charset_info;
extern CHARSET_INFO *all_charsets[256];
extern CHARSET_INFO compiled_charsets[];

/* statistics */
extern ulong    my_file_opened,my_stream_opened, my_tmp_file_created;
extern uint     mysys_usage_id;
extern my_bool  my_init_done;

                                        /* Point to current my_message() */
extern void (*my_sigtstp_cleanup)(void),
                                        /* Executed before jump to shell */
            (*my_sigtstp_restart)(void),
            (*my_abort_hook)(int);
                                        /* Executed when comming from shell */
extern int NEAR my_umask,               /* Default creation mask  */
           NEAR my_umask_dir,
           NEAR my_recived_signals,     /* Signals we have got */
           NEAR my_safe_to_handle_signal, /* Set when allowed to SIGTSTP */
           NEAR my_dont_interrupt;      /* call remember_intr when set */
extern my_bool NEAR mysys_uses_curses, my_use_symdir;
extern ulong sf_malloc_cur_memory, sf_malloc_max_memory;

extern ulong    my_default_record_cache_size;
extern my_bool NEAR my_disable_locking,NEAR my_disable_async_io,
               NEAR my_disable_flush_key_blocks, NEAR my_disable_symlinks;
extern char     wild_many,wild_one,wild_prefix;
extern const char *charsets_dir;
extern char *defaults_extra_file;
extern const char *defaults_group_suffix;
extern const char *defaults_file;

extern my_bool timed_mutexes;

typedef struct wild_file_pack   /* Struct to hold info when selecting files */
{
  uint          wilds;          /* How many wildcards */
  uint          not_pos;        /* Start of not-theese-files */
  my_string     *wild;          /* Pointer to wildcards */
} WF_PACK;

enum loglevel {
   ERROR_LEVEL,
   WARNING_LEVEL,
   INFORMATION_LEVEL
};

enum cache_type
{
  TYPE_NOT_SET= 0, READ_CACHE, WRITE_CACHE,
  SEQ_READ_APPEND               /* sequential read or append */,
  READ_FIFO, READ_NET,WRITE_NET};

enum flush_type
{
  FLUSH_KEEP, FLUSH_RELEASE, FLUSH_IGNORE_CHANGED, FLUSH_FORCE_WRITE
};

typedef struct st_record_cache  /* Used when cacheing records */
{
  File file;
  int   rc_seek,error,inited;
  uint  rc_length,read_length,reclength;
  my_off_t rc_record_pos,end_of_file;
  byte  *rc_buff,*rc_buff2,*rc_pos,*rc_end,*rc_request_pos;
#ifdef HAVE_AIOWAIT
  int   use_async_io;
  my_aio_result aio_result;
#endif
  enum cache_type type;
} RECORD_CACHE;

enum file_type
{
  UNOPEN = 0, FILE_BY_OPEN, FILE_BY_CREATE, STREAM_BY_FOPEN, STREAM_BY_FDOPEN,
  FILE_BY_MKSTEMP, FILE_BY_DUP
};

struct st_my_file_info
{
  my_string             name;
  enum file_type        type;
#if defined(THREAD) && !defined(HAVE_PREAD)
  pthread_mutex_t       mutex;
#endif
};

extern struct st_my_file_info *my_file_info;

typedef struct st_my_tmpdir
{
  char **list;
  uint cur, max;
#ifdef THREAD
  pthread_mutex_t mutex;
#endif
} MY_TMPDIR;

typedef struct st_dynamic_array
{
  char *buffer;
  uint elements,max_element;
  uint alloc_increment;
  uint size_of_element;
} DYNAMIC_ARRAY;

typedef struct st_dynamic_string
{
  char *str;
  uint length,max_length,alloc_increment;
} DYNAMIC_STRING;

struct st_io_cache;
typedef int (*IO_CACHE_CALLBACK)(struct st_io_cache*);

#ifdef THREAD
typedef struct st_io_cache_share
{
  /* to sync on reads into buffer */
  pthread_mutex_t mutex;
  pthread_cond_t  cond;
  int             count, total;
  /* actual IO_CACHE that filled the buffer */
  struct st_io_cache *active;
#ifdef NOT_YET_IMPLEMENTED
  /* whether the structure should be free'd */
  my_bool alloced;
#endif
} IO_CACHE_SHARE;
#endif

typedef struct st_io_cache              /* Used when cacheing files */
{
  /* Offset in file corresponding to the first byte of byte* buffer. */
  my_off_t pos_in_file;
  /*
    The offset of end of file for READ_CACHE and WRITE_CACHE.
    For SEQ_READ_APPEND it the maximum of the actual end of file and
    the position represented by read_end.
  */
  my_off_t end_of_file;
  /* Points to current read position in the buffer */
  byte  *read_pos;
  /* the non-inclusive boundary in the buffer for the currently valid read */
  byte  *read_end;
  byte  *buffer;                                /* The read buffer */
  /* Used in ASYNC_IO */
  byte  *request_pos;

  /* Only used in WRITE caches and in SEQ_READ_APPEND to buffer writes */
  byte  *write_buffer;
  /*
    Only used in SEQ_READ_APPEND, and points to the current read position
    in the write buffer. Note that reads in SEQ_READ_APPEND caches can
    happen from both read buffer (byte* buffer) and write buffer
    (byte* write_buffer).
  */
  byte *append_read_pos;
  /* Points to current write position in the write buffer */
  byte *write_pos;
  /* The non-inclusive boundary of the valid write area */
  byte *write_end;

  /*
    Current_pos and current_end are convenience variables used by
    my_b_tell() and other routines that need to know the current offset
    current_pos points to &write_pos, and current_end to &write_end in a
    WRITE_CACHE, and &read_pos and &read_end respectively otherwise
  */
  byte  **current_pos, **current_end;
#ifdef THREAD
  /*
    The lock is for append buffer used in SEQ_READ_APPEND cache
    need mutex copying from append buffer to read buffer.
  */
  pthread_mutex_t append_buffer_lock;
  /*
    The following is used when several threads are reading the
    same file in parallel. They are synchronized on disk
    accesses reading the cached part of the file asynchronously.
    It should be set to NULL to disable the feature.  Only
    READ_CACHE mode is supported.
  */
  IO_CACHE_SHARE *share;
#endif
  /*
    A caller will use my_b_read() macro to read from the cache
    if the data is already in cache, it will be simply copied with
    memcpy() and internal variables will be accordinging updated with
    no functions invoked. However, if the data is not fully in the cache,
    my_b_read() will call read_function to fetch the data. read_function
    must never be invoked directly.
  */
  int (*read_function)(struct st_io_cache *,byte *,uint);
  /*
    Same idea as in the case of read_function, except my_b_write() needs to
    be replaced with my_b_append() for a SEQ_READ_APPEND cache
  */
  int (*write_function)(struct st_io_cache *,const byte *,uint);
  /*
    Specifies the type of the cache. Depending on the type of the cache
    certain operations might not be available and yield unpredicatable
    results. Details to be documented later
  */
  enum cache_type type;
  /*
    Callbacks when the actual read I/O happens. These were added and
    are currently used for binary logging of LOAD DATA INFILE - when a
    block is read from the file, we create a block create/append event, and
    when IO_CACHE is closed, we create an end event. These functions could,
    of course be used for other things
  */
  IO_CACHE_CALLBACK pre_read;
  IO_CACHE_CALLBACK post_read;
  IO_CACHE_CALLBACK pre_close;
  /*
    Counts the number of times, when we were forced to use disk. We use it to
    increase the binlog_cache_disk_use status variable.
  */
  ulong disk_writes;
  void* arg;                            /* for use by pre/post_read */
  char *file_name;                      /* if used with 'open_cached_file' */
  char *dir,*prefix;
  File file; /* file descriptor */
  /*
    seek_not_done is set by my_b_seek() to inform the upcoming read/write
    operation that a seek needs to be preformed prior to the actual I/O
    error is 0 if the cache operation was successful, -1 if there was a
    "hard" error, and the actual number of I/O-ed bytes if the read/write was
    partial.
  */
  int   seek_not_done,error;
  /* buffer_length is memory size allocated for buffer or write_buffer */
  uint  buffer_length;
  /* read_length is the same as buffer_length except when we use async io */
  uint  read_length;
  myf   myflags;                        /* Flags used to my_read/my_write */
  /*
    alloced_buffer is 1 if the buffer was allocated by init_io_cache() and
    0 if it was supplied by the user.
    Currently READ_NET is the only one that will use a buffer allocated
    somewhere else
  */
  my_bool alloced_buffer;
#ifdef HAVE_AIOWAIT
  /*
    As inidicated by ifdef, this is for async I/O, which is not currently
    used (because it's not reliable on all systems)
  */
  uint inited;
  my_off_t aio_read_pos;
  my_aio_result aio_result;
#endif
} IO_CACHE;

typedef int (*qsort2_cmp)(const void *, const void *, const void *);

        /* defines for mf_iocache */

        /* Test if buffer is inited */
#define my_b_clear(info) (info)->buffer=0
#define my_b_inited(info) (info)->buffer
#define my_b_EOF INT_MIN

#define my_b_read(info,Buffer,Count) \
  ((info)->read_pos + (Count) <= (info)->read_end ?\
   (memcpy(Buffer,(info)->read_pos,(size_t) (Count)), \
    ((info)->read_pos+=(Count)),0) :\
   (*(info)->read_function)((info),Buffer,Count))

#define my_b_write(info,Buffer,Count) \
 ((info)->write_pos + (Count) <=(info)->write_end ?\
  (memcpy((info)->write_pos, (Buffer), (size_t)(Count)),\
   ((info)->write_pos+=(Count)),0) : \
   (*(info)->write_function)((info),(Buffer),(Count)))

#define my_b_get(info) \
  ((info)->read_pos != (info)->read_end ?\
   ((info)->read_pos++, (int) (uchar) (info)->read_pos[-1]) :\
   _my_b_get(info))

        /* my_b_write_byte dosn't have any err-check */
#define my_b_write_byte(info,chr) \
  (((info)->write_pos < (info)->write_end) ?\
   ((*(info)->write_pos++)=(chr)) :\
   (_my_b_write(info,0,0) , ((*(info)->write_pos++)=(chr))))

#define my_b_fill_cache(info) \
  (((info)->read_end=(info)->read_pos),(*(info)->read_function)(info,0,0))

#define my_b_tell(info) ((info)->pos_in_file + \
                         (uint) (*(info)->current_pos - (info)->request_pos))

/* tell write offset in the SEQ_APPEND cache */
my_off_t my_b_append_tell(IO_CACHE* info);
my_off_t my_b_safe_tell(IO_CACHE* info); /* picks the correct tell() */

#define my_b_bytes_in_cache(info) (uint) (*(info)->current_end - \
                                          *(info)->current_pos)

typedef uint32 ha_checksum;

/* Define the type of function to be passed to process_default_option_files */
typedef int (*Process_option_func)(void *ctx, const char *group_name,
                                   const char *option);

#include <my_alloc.h>


        /* Prototypes for mysys and my_func functions */

extern int my_copy(const char *from,const char *to,myf MyFlags);
extern int my_append(const char *from,const char *to,myf MyFlags);
extern int my_delete(const char *name,myf MyFlags);
extern int my_getwd(my_string buf,uint size,myf MyFlags);
extern int my_setwd(const char *dir,myf MyFlags);
extern int my_lock(File fd,int op,my_off_t start, my_off_t length,myf MyFlags);
extern gptr my_once_alloc(uint Size,myf MyFlags);
extern void my_once_free(void);
extern char *my_once_strdup(const char *src,myf myflags);
extern char *my_once_memdup(const char *src, uint len, myf myflags);
extern File my_open(const char *FileName,int Flags,myf MyFlags);
extern File my_register_filename(File fd, const char *FileName,
                                 enum file_type type_of_file,
                                 uint error_message_number, myf MyFlags);
extern File my_create(const char *FileName,int CreateFlags,
                      int AccessFlags, myf MyFlags);
extern int my_close(File Filedes,myf MyFlags);
extern File my_dup(File file, myf MyFlags);
extern int my_mkdir(const char *dir, int Flags, myf MyFlags);
extern int my_readlink(char *to, const char *filename, myf MyFlags);
extern int my_realpath(char *to, const char *filename, myf MyFlags);
extern File my_create_with_symlink(const char *linkname, const char *filename,
                                   int createflags, int access_flags,
                                   myf MyFlags);
extern int my_delete_with_symlink(const char *name, myf MyFlags);
extern int my_rename_with_symlink(const char *from,const char *to,myf MyFlags);
extern int my_symlink(const char *content, const char *linkname, myf MyFlags);
extern uint my_read(File Filedes,byte *Buffer,uint Count,myf MyFlags);
extern uint my_pread(File Filedes,byte *Buffer,uint Count,my_off_t offset,
                     myf MyFlags);
extern int my_rename(const char *from,const char *to,myf MyFlags);
extern my_off_t my_seek(File fd,my_off_t pos,int whence,myf MyFlags);
extern my_off_t my_tell(File fd,myf MyFlags);
extern uint my_write(File Filedes,const byte *Buffer,uint Count,
                     myf MyFlags);
extern uint my_pwrite(File Filedes,const byte *Buffer,uint Count,
                      my_off_t offset,myf MyFlags);
extern uint my_fread(FILE *stream,byte *Buffer,uint Count,myf MyFlags);
extern uint my_fwrite(FILE *stream,const byte *Buffer,uint Count,
                      myf MyFlags);
extern my_off_t my_fseek(FILE *stream,my_off_t pos,int whence,myf MyFlags);
extern my_off_t my_ftell(FILE *stream,myf MyFlags);
extern gptr _mymalloc(uint uSize,const char *sFile,
                      uint uLine, myf MyFlag);
extern gptr _myrealloc(gptr pPtr,uint uSize,const char *sFile,
                       uint uLine, myf MyFlag);
extern gptr my_multi_malloc _VARARGS((myf MyFlags, ...));
extern void _myfree(gptr pPtr,const char *sFile,uint uLine, myf MyFlag);
extern int _sanity(const char *sFile,unsigned int uLine);
extern gptr _my_memdup(const byte *from,uint length,
                       const char *sFile, uint uLine,myf MyFlag);
extern my_string _my_strdup(const char *from, const char *sFile, uint uLine,
                            myf MyFlag);
extern char *_my_strndup(const char *from, uint length,
                                    const char *sFile, uint uLine,
                                    myf MyFlag);

/* implemented in my_memmem.c */
extern void *my_memmem(const void *haystack, size_t haystacklen,
    const void *needle, size_t needlelen);


#ifdef __WIN__
extern int my_access(const char *path, int amode);
extern File my_sopen(const char *path, int oflag, int shflag, int pmode);
#else
#define my_access access
#endif
extern int check_if_legal_filename(const char *path);
extern int check_if_legal_tablename(const char *path);

#if defined(__WIN__) && defined(__NT__)
extern int nt_share_delete(const char *name,myf MyFlags);
#define my_delete_allow_opened(fname,flags)  nt_share_delete((fname),(flags))
#else
#define my_delete_allow_opened(fname,flags)  my_delete((fname),(flags))
#endif

#ifndef TERMINATE
extern void TERMINATE(FILE *file);
#endif
extern void init_glob_errs(void);
extern FILE *my_fopen(const char *FileName,int Flags,myf MyFlags);
extern FILE *my_fdopen(File Filedes,const char *name, int Flags,myf MyFlags);
extern int my_fclose(FILE *fd,myf MyFlags);
extern int my_chsize(File fd,my_off_t newlength, int filler, myf MyFlags);
extern int my_sync(File fd, myf my_flags);
extern int my_error _VARARGS((int nr,myf MyFlags, ...));
extern int my_printf_error _VARARGS((uint my_err, const char *format,
                                     myf MyFlags, ...)
                                    __attribute__ ((format (printf, 2, 4))));
extern int my_error_register(const char **errmsgs, int first, int last);
extern const char **my_error_unregister(int first, int last);
extern int my_message(uint my_err, const char *str,myf MyFlags);
extern int my_message_no_curses(