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mariadb/isam/isamdef.h
unknown 35da5e43fb Merge key cache structures to one 
Fixed compiler warnings (IRIX C compiler and VC++)


VC++Files/client/mysqlclient.dsp:
  Add missing file to project
VC++Files/libmysql/libmysql.dsp:
  Add missing file to project
VC++Files/myisam/myisam.dsp:
  Add missing file to project
VC++Files/mysys/mysys.dsp:
  Add missing file to project
heap/hp_test1.c:
  Fixed wrong call to heap_rkey()
heap/hp_test2.c:
  Fixed wrong call to heap_rkey()
include/hash.h:
  Move not used (internal) struct to hash.c
include/my_pthread.h:
  Made some structs 'const char*' to avoid warnings
include/my_sys.h:
  Moved key cache structs and functions to keycache.h
include/myisam.h:
  Merge key cache structures to one
include/mysql.h:
  Remove STDCALL from internal functions
include/sql_common.h:
  Remove STDCALL from internal functions
include/violite.h:
  Fixed compiler warning
isam/_locking.c:
  Merge key cache structures to one
isam/_page.c:
  Merge key cache structures to one
isam/close.c:
  Merge key cache structures to one
isam/extra.c:
  Merge key cache structures to one
isam/isamchk.c:
  Merge key cache structures to one
isam/isamdef.h:
  Merge key cache structures to one
isam/isamlog.c:
  Merge key cache structures to one
isam/panic.c:
  Merge key cache structures to one
isam/test2.c:
  Merge key cache structures to one
isam/test3.c:
  Merge key cache structures to one
libmysql/client_settings.h:
  Remove STDCALL from internal functions
libmysql/libmysql.c:
  Remove STDCALL from internal functions
myisam/ft_boolean_search.c:
  Fixed compiler warning
myisam/ft_dump.c:
  Fixed compiler warnings (%qx is not portable)
myisam/ft_update.c:
  Fixed compiler warnings
myisam/mi_check.c:
  Merge key cache structures to one
myisam/mi_close.c:
  Merge key cache structures to one
myisam/mi_delete_all.c:
  Merge key cache structures to one
myisam/mi_extra.c:
  Merge key cache structures to one
myisam/mi_keycache.c:
  Merge key cache structures to one
myisam/mi_locking.c:
  Merge key cache structures to one
myisam/mi_page.c:
  Merge key cache structures to one
myisam/mi_panic.c:
  Merge key cache structures to one
myisam/mi_preload.c:
  Merge key cache structures to one
myisam/mi_test1.c:
  Merge key cache structures to one
myisam/mi_test2.c:
  Merge key cache structures to one
myisam/mi_test3.c:
  Merge key cache structures to one
myisam/myisamchk.c:
  Merge key cache structures to one
myisam/myisamdef.h:
  Merge key cache structures to one
myisam/myisamlog.c:
  Merge key cache structures to one
  Removed not used option
myisam/sort.c:
  Fixed compiler warnings
myisam/sp_test.c:
  Fixed compiler warnings
mysql-test/r/case.result:
  Updated results after fix of correct NULL detection in WHEN
mysql-test/r/date_formats.result:
  Updated results after fixing date handling
mysql-test/r/symlink.result:
  Updated results after adding DEFAULT CHARSET
mysql-test/t/case.test:
  New test
mysql-test/t/symlink.test:
  Updated error numbers
mysys/hash.c:
  Made HASH_LINK struct local
mysys/mf_keycache.c:
  Merge key cache structures to one
  Fixed key_cache_read() and key_cache_write() to be resize-safe.
mysys/mf_keycaches.c:
  Merge key cache structures to one
mysys/thr_mutex.c:
  Added test if mutex is initalized
sql-common/client.c:
  Remove STDCALL from internal functions
sql/derror.cc:
  Added comment
sql/field.cc:
  Removed not used variables
sql/ha_innodb.cc:
  Fixed compiler warnings (removed not used variables)
sql/ha_myisam.cc:
  Merge key cache structures to one
sql/ha_myisammrg.cc:
  Removed not used variables
sql/handler.cc:
  Merge key cache structures to one
sql/handler.h:
  Merge key cache structures to one
sql/item.cc:
  Fixed compiler warning
sql/item_cmpfunc.cc:
  Remove not used variables
sql/item_func.cc:
  Remove not used variables
sql/item_strfunc.cc:
  Removed not used variables
sql/item_sum.cc:
  Removed not used variables
  Moved setting of item_thd to fix_fields()
sql/item_timefunc.cc:
  Removed not used variables
sql/mysql_priv.h:
  Merge key cache structures to one
sql/mysqld.cc:
  Merge key cache structures to one
  init_thread_environment() is not called before mysql_init_variables(). This fixes a case where a mutex was not initialized before it was used
sql/opt_sum.cc:
  Remove not used variables
sql/protocol.cc:
  Don't send errors after ok has been sent
sql/protocol_cursor.cc:
  Remove not used variable
  Simple optimization
sql/repl_failsafe.cc:
  Remove not used variables
sql/set_var.cc:
  Merge key cache structures to one
sql/set_var.h:
  Merge key cache structures to one
sql/sql_acl.cc:
  Remove not used variables
sql/sql_base.cc:
  Remove not used function
sql/sql_db.cc:
  Remove not used variables
sql/sql_handler.cc:
  Remove not used variables
sql/sql_insert.cc:
  More DBUG statements
  Simple code cleanup
sql/sql_lex.cc:
  Remove not used variables
sql/sql_parse.cc:
  Remove not used variables
sql/sql_prepare.cc:
  Remove not used variables
sql/sql_repl.cc:
  Remove not used variables
sql/sql_select.cc:
  Remove not used variables
sql/sql_show.cc:
  Remove not used variables
sql/sql_table.cc:
  Merge key cache structures to one
  Removed not used variables
sql/sql_test.cc:
  Merge key cache structures to one
sql/strfunc.cc:
  Fixed that find_type() returns correct value for partly matched words.
  (This fixed the error found by date_formats.test)
sql/time.cc:
  Remove not used variables
strings/my_strtoll10.c:
  Fixed compiler warnings
2003-11-20 22:06:25 +02:00

418 lines
16 KiB
C
Raw Blame History

/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult 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 */
/* Denna fil includeras i alla isam-filer */
#define ISAM_LIBRARY
#include <nisam.h> /* Structs & some defines */
#ifdef THREAD
#include <my_pthread.h>
#include <thr_lock.h>
#else
#include <my_no_pthread.h>
#endif
#include <keycache.h>
#ifdef my_write
#undef my_write /* We want test if disk full */
#endif
#undef HA_SORT_ALLOWS_SAME
#define HA_SORT_ALLOWS_SAME 128 /* Can't be > 128 in NISAM */
#ifdef __WATCOMC__
#pragma pack(2)
#define uint uint16 /* Same format as in MSDOS */
#endif
#ifdef __ZTC__
#pragma ZTC align 2
#define uint uint16 /* Same format as in MSDOS */
#endif
#if defined(__WIN__) && defined(_MSC_VER)
#pragma pack(push,isamdef,2)
#define uint uint16
#endif
typedef struct st_state_info
{
struct { /* Fileheader */
uchar file_version[4];
uchar options[2];
uchar header_length[2];
uchar state_info_length[2];
uchar base_info_length[2];
uchar base_pos[2];
uchar not_used[2];
} header;
ulong records; /* Antal record i databasen */
ulong del; /* Antalet borttagna poster */
ulong dellink; /* L{nk till n{sta borttagna */
ulong key_file_length;
ulong data_file_length;
ulong splitt; /* Antal splittrade delar */
ulong empty; /* Outnyttjat utrymme */
ulong process; /* Vem som senast uppdatera */
ulong loop; /* not used anymore */
ulong uniq; /* Unik nr i denna process */
ulong key_root[N_MAXKEY]; /* Pekare till rootblocken */
ulong key_del[N_MAXKEY]; /* Del-l{nkar f|r n-block */
ulong sec_index_changed; /* Updated when new sec_index */
ulong sec_index_used; /* 1 bit for each sec index in use */
ulong version; /* timestamp of create */
uint keys; /* Keys in use for database */
} N_STATE_INFO;
typedef struct st_base_info
{
ulong keystart; /* Var nycklarna b|rjar */
ulong records,reloc; /* Parameter vid skapandet */
ulong max_pack_length; /* Max possibly length of packed rec.*/
ulong max_data_file_length;
ulong max_key_file_length;
uint reclength; /* length of unpacked record */
uint options; /* Options used */
uint pack_reclength; /* Length of full packed rec. */
uint min_pack_length;
uint min_block_length;
uint rec_reflength; /* = 2 or 3 or 4 */
uint key_reflength; /* = 2 or 3 or 4 */
uint keys; /* Keys defined for database */
uint blobs; /* Number of blobs */
uint max_block; /* Max blockl{ngd anv{nd */
uint max_key_length; /* L{ngsta nyckel-l{ngden */
uint fields, /* Antal f{lt i databasen */
pack_fields, /* Packade f{lt i databasen */
pack_bits; /* Length of packed bits */
time_t create_time; /* Time when created database */
time_t isamchk_time; /* Time for last recover */
ulong rec_per_key[N_MAXKEY]; /* for sql optimizing */
uint sortkey; /* sorted by this key */
} N_BASE_INFO;
#ifdef __ZTC__
#pragma ZTC align
#undef uint
#endif
#ifdef __WATCOMC__
#pragma pack()
#undef uint
#endif
#if defined(__WIN__) && defined(_MSC_VER)
#pragma pack(pop,isamdef)
#undef uint
#endif
/* Structs used intern in database */
typedef struct st_n_blob /* Info of record */
{
uint offset; /* Offset to blob in record */
uint pack_length; /* Type of packed length */
uint length; /* Calc:ed for each record */
} N_BLOB;
typedef struct st_isam_pack {
ulong header_length;
uint ref_length;
} N_PACK;
typedef struct st_isam_share { /* Shared between opens */
N_STATE_INFO state;
N_BASE_INFO base;
N_KEYDEF *keyinfo; /* Nyckelinfo */
N_RECINFO *rec; /* Pointer till recdata */
N_PACK pack; /* Data about packed records */
N_BLOB *blobs; /* Pointer to blobs */
char *filename; /* Name of indexfile */
byte *file_map; /* mem-map of file if possible */
ulong this_process; /* processid */
ulong last_process; /* For table-change-check */
ulong last_version; /* Version on start */
uint rec_reflength; /* rec_reflength in use now */
int kfile; /* Shared keyfile */
int mode; /* mode of file on open */
int reopen; /* How many times reopened */
uint state_length;
uint w_locks,r_locks; /* Number of read/write locks */
uint min_pack_length; /* Theese is used by packed data */
uint max_pack_length;
uint blocksize; /* blocksize of keyfile */
my_bool changed,not_flushed; /* If changed since lock */
int rnd; /* rnd-counter */
DECODE_TREE *decode_trees;
uint16 *decode_tables;
enum data_file_type data_file_type;
int (*read_record)(struct st_isam_info*, ulong, byte*);
int (*write_record)(struct st_isam_info*, const byte*);
int (*update_record)(struct st_isam_info*, ulong, const byte*);
int (*delete_record)(struct st_isam_info*);
int (*read_rnd)(struct st_isam_info*, byte*, ulong, int);
int (*compare_record)(struct st_isam_info*, const byte *);
#ifdef THREAD
THR_LOCK lock;
pthread_mutex_t intern_lock; /* Locking for use with _locking */
#endif
} ISAM_SHARE;
typedef uint bit_type;
typedef struct st_bit_buff { /* Used for packing of record */
bit_type current_byte;
uint bits;
uchar *pos,*end;
uint error;
} BIT_BUFF;
typedef struct st_isam_info {
ISAM_SHARE *s; /* Shared between open:s */
N_BLOB *blobs; /* Pointer to blobs */
int dfile; /* The datafile */
BIT_BUFF bit_buff;
uint options;
uint opt_flag; /* Optim. for space/speed */
uint update; /* If file changed since open */
char *filename; /* parameter to open filename */
ulong this_uniq; /* uniq filenumber or thread */
ulong last_uniq; /* last uniq number */
ulong this_loop; /* counter for this open */
ulong last_loop; /* last used counter */
ulong lastpos, /* Last record position */
nextpos; /* Position to next record */
ulong int_pos; /* Intern variabel */
ulong dupp_key_pos; /* Position to record with dupp key */
ulong last_search_keypage;
ulong save_lastpos;
uint packed_length; /* Length of found, packed record */
uint alloced_rec_buff_length; /* Max recordlength malloced */
uchar *buff, /* Temp area for key */
*lastkey; /* Last used search key */
byte *rec_buff, /* Tempbuff for recordpack */
*rec_alloc; /* Malloced area for record */
uchar *int_keypos, /* Intern variabel */
*int_maxpos; /* Intern variabel */
int lastinx; /* Last used index */
int errkey; /* Got last error on this key */
uint data_changed; /* Somebody has changed data */
int lock_type; /* How database was locked */
int tmp_lock_type; /* When locked by readinfo */
int was_locked; /* Was locked in panic */
myf lock_wait; /* is 0 or MY_DONT_WAIT */
my_bool page_changed;
my_bool buff_used;
uint save_update; /* When using KEY_READ */
int save_lastinx;
int (*read_record)(struct st_isam_info*, ulong, byte*);
LIST open_list;
IO_CACHE rec_cache; /* When cacheing records */
#ifdef THREAD
THR_LOCK_DATA lock;
#endif
} N_INFO;
/* Some defines used by isam-funktions */
#define USE_HOLE_KEY 0 /* Use hole key in _nisam_search() */
#define F_EXTRA_LCK -1
/* bits in opt_flag */
#define MEMMAP_USED 32
#define REMEMBER_OLD_POS 64
#define getint(x) ((uint) (uint16) *((int16*) (x)) & 32767)
#define putint(x,y,nod) (*((uint16*) (x))= ((nod ? (uint16) 32768 : 0)+(uint16) (y)))
#ifdef WORDS_BIGENDIAN
#define test_if_nod(x) (x[0] & 128 ? info->s->base.key_reflength : 0)
#else
#define test_if_nod(x) (x[1] & 128 ? info->s->base.key_reflength : 0)
#endif
#define N_MIN_BLOCK_LENGTH 8 /* Because of delete-link */
#define N_EXTEND_BLOCK_LENGTH 20 /* Don't use to small record-blocks */
#define N_SPLITT_LENGTH ((N_EXTEND_BLOCK_LENGTH+3)*2)
#define MAX_DYN_BLOCK_HEADER 11 /* Max prefix of record-block */
#define DYN_DELETE_BLOCK_HEADER 8 /* length of delete-block-header */
#define MEMMAP_EXTRA_MARGIN 7 /* Write this as a suffix for file */
#define INDEX_BLOCK_MARGIN 16 /* Safety margin for .ISM tables */
#define PACK_TYPE_SELECTED 1 /* Bits in field->pack_type */
#define PACK_TYPE_SPACE_FIELDS 2
#define PACK_TYPE_ZERO_FILL 4
#ifdef THREAD
extern pthread_mutex_t THR_LOCK_isam;
#endif
/* Some extern variables */
extern LIST *nisam_open_list;
extern uchar NEAR nisam_file_magic[],NEAR nisam_pack_file_magic[];
extern uint NEAR nisam_read_vec[],nisam_quick_table_bits;
extern File nisam_log_file;
/* This is used by _nisam_get_pack_key_length och _nisam_store_key */
typedef struct st_s_param
{
uint ref_length,key_length,
n_ref_length,
n_length,
totlength,
part_of_prev_key,prev_length;
uchar *key, *prev_key;
} S_PARAM;
/* Prototypes for intern functions */
extern int _nisam_read_dynamic_record(N_INFO *info,ulong filepos,byte *buf);
extern int _nisam_write_dynamic_record(N_INFO*, const byte*);
extern int _nisam_update_dynamic_record(N_INFO*, ulong, const byte*);
extern int _nisam_delete_dynamic_record(N_INFO *info);
extern int _nisam_cmp_dynamic_record(N_INFO *info,const byte *record);
extern int _nisam_read_rnd_dynamic_record(N_INFO *, byte *,ulong, int);
extern int _nisam_write_blob_record(N_INFO*, const byte*);
extern int _nisam_update_blob_record(N_INFO*, ulong, const byte*);
extern int _nisam_read_static_record(N_INFO *info,ulong filepos,byte *buf);
extern int _nisam_write_static_record(N_INFO*, const byte*);
extern int _nisam_update_static_record(N_INFO*, ulong, const byte*);
extern int _nisam_delete_static_record(N_INFO *info);
extern int _nisam_cmp_static_record(N_INFO *info,const byte *record);
extern int _nisam_read_rnd_static_record(N_INFO*, byte *,ulong, int);
extern int _nisam_ck_write(N_INFO *info,uint keynr,uchar *key);
extern int _nisam_enlarge_root(N_INFO *info,uint keynr,uchar *key);
extern int _nisam_insert(N_INFO *info,N_KEYDEF *keyinfo,uchar *key,
uchar *anc_buff,uchar *key_pos,uchar *key_buff,
uchar *father_buff, uchar *father_keypos,
ulong father_page);
extern int _nisam_splitt_page(N_INFO *info,N_KEYDEF *keyinfo,uchar *key,
uchar *buff,uchar *key_buff);
extern uchar *_nisam_find_half_pos(N_INFO *info,N_KEYDEF *keyinfo,uchar *page,
uchar *key);
extern uint _nisam_get_pack_key_length(N_KEYDEF *keyinfo,uint nod_flag,
uchar *key_pos,uchar *key_buff,
uchar *key, S_PARAM *s_temp);
extern void _nisam_store_key(N_KEYDEF *keyinfo,uchar *key_pos,
S_PARAM *s_temp);
extern int _nisam_ck_delete(N_INFO *info,uint keynr,uchar *key);
extern int _nisam_readinfo(N_INFO *info,int lock_flag,int check_keybuffer);
extern int _nisam_writeinfo(N_INFO *info, uint flag);
extern int _nisam_test_if_changed(N_INFO *info);
extern int _nisam_check_index(N_INFO *info,int inx);
extern int _nisam_search(N_INFO *info,N_KEYDEF *keyinfo,uchar *key,uint key_len,uint nextflag,ulong pos);
extern int _nisam_bin_search(struct st_isam_info *info,N_KEYDEF *keyinfo,uchar *page,uchar *key,uint key_len,uint comp_flag,uchar * *ret_pos,uchar *buff);
extern int _nisam_seq_search(N_INFO *info,N_KEYDEF *keyinfo,uchar *page,uchar *key,uint key_len,uint comp_flag,uchar * *ret_pos,uchar *buff);
extern ulong _nisam_kpos(uint nod_flag,uchar *after_key);
extern void _nisam_kpointer(N_INFO *info,uchar *buff,ulong pos);
extern ulong _nisam_dpos(N_INFO *info, uint nod_flag,uchar *after_key);
extern void _nisam_dpointer(N_INFO *info, uchar *buff,ulong pos);
extern int _nisam_key_cmp(N_KEYSEG *keyseg,uchar *a,uchar *b,
uint key_length,uint nextflag);
extern uint _nisam_get_key(N_KEYDEF *keyinfo,uint nod_flag,uchar * *page,uchar *key);
extern uint _nisam_get_static_key(N_KEYDEF *keyinfo,uint nod_flag,uchar * *page,uchar *key);
extern uchar *_nisam_get_last_key(N_INFO *info,N_KEYDEF *keyinfo,uchar *keypos,uchar *lastkey,uchar *endpos);
extern uint _nisam_keylength(N_KEYDEF *keyinfo,uchar *key);
extern uchar *_nisam_move_key(N_KEYDEF *keyinfo,uchar *to,uchar *from);
extern int _nisam_search_next(N_INFO *info,N_KEYDEF *keyinfo,uchar *key,uint nextflag,ulong pos);
extern int _nisam_search_first(N_INFO *info,N_KEYDEF *keyinfo,ulong pos);
extern int _nisam_search_last(N_INFO *info,N_KEYDEF *keyinfo,ulong pos);
extern uchar *_nisam_fetch_keypage(N_INFO *info,N_KEYDEF *keyinfo,my_off_t page,
uchar *buff,int return_buffer);
extern int _nisam_write_keypage(N_INFO *info,N_KEYDEF *keyinfo,my_off_t page,
uchar *buff);
extern int _nisam_dispose(N_INFO *info,N_KEYDEF *keyinfo,my_off_t pos);
extern ulong _nisam_new(N_INFO *info,N_KEYDEF *keyinfo);
extern uint _nisam_make_key(N_INFO *info,uint keynr,uchar *key,
const char *record,ulong filepos);
extern uint _nisam_pack_key(N_INFO *info,uint keynr,uchar *key,uchar *old,uint key_length);
extern int _nisam_read_key_record(N_INFO *info,ulong filepos,byte *buf);
extern int _nisam_read_cache(IO_CACHE *info,byte *buff,ulong pos,
uint length,int re_read_if_possibly);
extern byte *fix_rec_buff_for_blob(N_INFO *info,uint blob_length);
extern uint _nisam_rec_unpack(N_INFO *info,byte *to,byte *from,
uint reclength);
my_bool _nisam_rec_check(N_INFO *info,const char *from);
extern int _nisam_write_part_record(N_INFO *info,ulong filepos,uint length,
ulong next_filepos,byte **record,
uint *reclength,int *flag);
extern void _nisam_print_key(FILE *stream,N_KEYSEG *keyseg,const uchar *key);
extern my_bool _nisam_read_pack_info(N_INFO *info,pbool fix_keys);
extern int _nisam_read_pack_record(N_INFO *info,ulong filepos,byte *buf);
extern int _nisam_read_rnd_pack_record(N_INFO*, byte *,ulong, int);
extern int _nisam_pack_rec_unpack(N_INFO *info,byte *to,byte *from,
uint reclength);
extern ulong _nisam_checksum(const byte *mem, uint count);
typedef struct st_sortinfo {
uint key_length;
ulong max_records;
int (*key_cmp)(const void *, const void *, const void *);
int (*key_read)(void *buff);
int (*key_write)(const void *buff);
void (*lock_in_memory)(void);
} SORT_PARAM;
int _create_index_by_sort(SORT_PARAM *info,pbool no_messages,
uint sortbuff_size);
#define BLOCK_INFO_HEADER_LENGTH 11
typedef struct st_block_info { /* Parameter to _nisam_get_block_info */
uchar header[BLOCK_INFO_HEADER_LENGTH];
uint rec_len;
uint data_len;
uint block_len;
ulong filepos; /* Must be ulong on Alpha! */
ulong next_filepos;
uint second_read;
} BLOCK_INFO;
/* bits in return from _nisam_get_block_info */
#define BLOCK_FIRST 1
#define BLOCK_LAST 2
#define BLOCK_DELETED 4
#define BLOCK_ERROR 8 /* Wrong data */
#define BLOCK_SYNC_ERROR 16 /* Right data at wrong place */
#define BLOCK_FATAL_ERROR 32 /* hardware-error */
enum nisam_log_commands {
LOG_OPEN,LOG_WRITE,LOG_UPDATE,LOG_DELETE,LOG_CLOSE,LOG_EXTRA,LOG_LOCK
};
#define nisam_log_simple(a,b,c,d) if (nisam_log_file >= 0) _nisam_log(a,b,c,d)
#define nisam_log_command(a,b,c,d,e) if (nisam_log_file >= 0) _nisam_log_command(a,b,c,d,e)
#define nisam_log_record(a,b,c,d,e) if (nisam_log_file >= 0) _nisam_log_record(a,b,c,d,e)
extern uint _nisam_get_block_info(BLOCK_INFO *,File, ulong);
extern uint _nisam_rec_pack(N_INFO *info,byte *to,const byte *from);
extern uint _nisam_pack_get_block_info(BLOCK_INFO *, uint, File, ulong);
extern uint _calc_total_blob_length(N_INFO *info,const byte *record);
extern void _nisam_log(enum nisam_log_commands command,N_INFO *info,
const byte *buffert,uint length);
extern void _nisam_log_command(enum nisam_log_commands command,
N_INFO *info, const byte *buffert,
uint length, int result);
extern void _nisam_log_record(enum nisam_log_commands command,N_INFO *info,
const byte *record,ulong filepos,
int result);
extern my_bool _nisam_memmap_file(N_INFO *info);
extern void _nisam_unmap_file(N_INFO *info);
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