my_sys.h

虽然mysql已经在.NET平台上提供了支持

/* Copyright Abandoned 1996 TCX DataKonsult AB & Monty Program KB & Detron HB
   This file is public domain and comes with NO WARRANTY of any kind */

#ifndef _my_sys_h
#define _my_sys_h
#ifdef	__cplusplus
extern "C" {
#endif

#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

#ifdef THREAD
extern int *_my_errno(void) __attribute__ ((const));
#define my_errno  (*_my_errno())
#else
extern int NEAR my_errno;		/* Last error in mysys */
#endif

#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 MAXMAPS		(4)	/* Number of error message maps */
#define ERRMOD		(1000)	/* Max number of errors in a map */
#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_LINK_WARNING 32	/* my_redel() gives warning if links */
#define MY_COPYTIME	64	/* my_redel() copys time */
#define MY_HOLD_ORIGINAL_MODES 128  /* my_copy() holds to file modes */
#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_CHECK_ERROR	1	/* Params to my_end; Check open-close */
#define MY_GIVE_INFO	2	/* Give time info about process*/

#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))


	/* 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 */

	/* defines when allocating data */

#ifdef SAFEMALLOC
#define my_malloc(SZ,FLAG) _mymalloc( SZ, __FILE__, __LINE__, 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 QUICK_SAFEMALLOC sf_malloc_quick=1
#define NORMAL_SAFEMALLOC sf_malloc_quick=0
extern uint sf_malloc_prehunc,sf_malloc_endhunc,sf_malloc_quick;
#else
#define my_checkmalloc() (0)
#define TERMINATE(A) {}
#define QUICK_SAFEMALLOC
#define NORMAL_SAFEMALLOC
extern gptr my_malloc(uint Size,myf MyFlags);
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 string my_strdup(const char *from,myf MyFlags);
#define my_free(PTR,FG) my_no_flags_free(PTR)
#endif
#ifdef HAVE_ALLOCA
#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 */
#ifdef MSDOS
#ifdef __ZTC__
void * __CDECL halloc(long count,size_t length);
void   __CDECL hfree(void *ptr);
#endif
#if defined(USE_HALLOC)
#if defined(_VCM_) || defined(M_IC80386)
#undef USE_HALLOC
#endif
#endif
#ifdef USE_HALLOC
#define malloc(a) halloc((long) (a),1)
#define free(a) hfree(a)
#endif
#endif /* MSDOS */


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

					/* 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_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 */
	   NEAR mysys_uses_curses;
extern long lCurMemory,lMaxMemory;	/* from safemalloc */

extern ulong	my_default_record_cache_size;
extern int NEAR my_disable_locking,NEAR my_disable_async_io;
extern char	wild_many,wild_one,wild_prefix;

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 */
  string	*wild;		/* Pointer to wildcards */
} WF_PACK;

typedef struct st_typelib {	/* Different types saved here */
  uint count;			/* How many types */
  string name;			/* Name of typelib */
  string *type_names;
} TYPELIB;

enum cache_type {READ_CACHE,WRITE_CACHE};

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 };

extern struct my_file_info
{
  string		name;
  enum file_type	type;
} my_file_info[MY_NFILE];


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;


typedef struct st_io_cache		/* Used when cacheing files */
{
  byte	*rc_pos,*rc_end,*buffer,*rc_request_pos;
  File file;
  int	seek_not_done,error;
  uint	buffer_length,read_length;
  my_off_t pos_in_file,end_of_file;
  myf	myflags;			/* Flags used to my_read/my_write */
#ifdef HAVE_AIOWAIT
  uint inited;
  my_off_t aio_read_pos;
  my_aio_result aio_result;
#endif
  enum cache_type type;
  int (*read_function)(struct st_io_cache *,byte *,uint);
  char *file_name;			/* if used with 'open_cacheed_file' */