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Restructure the OS interface yet again. This time make the OsFile object

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a virtual base class which is subclassed for unix, windows, and the crash
test simulator.  Add the new file "os.c" for common os layer code.  Move
all OS-specific routines into the sqlite3Os structure. (CVS 2795)

FossilOrigin-Name: bd8740d1aecba69e1b5d64d43db07e8ad8841f07
This commit is contained in:
drh
2005-11-30 03:20:31 +00:00
parent 392b3ddf2e
commit 054889ec6d
20 changed files with 752 additions and 598 deletions
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93
src/os.h
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@@ -42,10 +42,43 @@
# endif
#endif
/*
** The OsFile object describes an open disk file in an OS-dependent way.
** Forward declarations
*/
typedef struct OsFile OsFile;
typedef struct IoMethod IoMethod;
/*
** An instance of the following structure contains pointers to all
** methods on an OsFile object.
*/
struct IoMethod {
int (*xClose)(OsFile**);
int (*xOpenDirectory)(OsFile*, const char*);
int (*xRead)(OsFile*, void*, int amt);
int (*xWrite)(OsFile*, const void*, int amt);
int (*xSeek)(OsFile*, i64 offset);
int (*xTruncate)(OsFile*, i64 size);
int (*xSync)(OsFile*, int);
void (*xSetFullSync)(OsFile *id, int setting);
int (*xFileHandle)(OsFile *id);
int (*xFileSize)(OsFile*, i64 *pSize);
int (*xLock)(OsFile*, int);
int (*xUnlock)(OsFile*, int);
int (*xLockState)(OsFile *id);
int (*xCheckReservedLock)(OsFile *id);
};
/*
** The OsFile object describes an open disk file in an OS-dependent way.
** The version of OsFile defined here is a generic versions. Each Os
** implementation defines its own subclass of this structure that contains
** additional information needed to handle file I/O.
*/
struct OsFile {
IoMethod const *pMethod;
};
/*
** Define the maximum size of a temporary filename
@@ -168,42 +201,44 @@ extern unsigned int sqlite3_pending_byte;
/*
** A single global instance of the following structure holds pointers to the
** various disk I/O routines.
** various system-specific interface routines.
*/
extern struct sqlite3IoVtbl {
int (*xDelete)(const char*);
int (*xFileExists)(const char*);
extern struct sqlite3OsVtbl {
int (*xOpenReadWrite)(const char*, OsFile**, int*);
int (*xOpenExclusive)(const char*, OsFile**, int);
int (*xOpenReadOnly)(const char*, OsFile**);
int (*xOpenDirectory)(const char*, OsFile*);
int (*xDelete)(const char*);
int (*xFileExists)(const char*);
char *(*xFullPathname)(const char*);
int (*xIsDirWritable)(char*);
int (*xSyncDirectory)(const char*);
int (*xTempFileName)(char*);
int (*xIsDirWritable)(char*);
int (*xClose)(OsFile**);
int (*xRead)(OsFile*, void*, int amt);
int (*xWrite)(OsFile*, const void*, int amt);
int (*xSeek)(OsFile*, i64 offset);
int (*xSync)(OsFile*, int);
int (*xTruncate)(OsFile*, i64 size);
int (*xFileSize)(OsFile*, i64 *pSize);
char *(*xFullPathname)(const char*);
int (*xLock)(OsFile*, int);
int (*xUnlock)(OsFile*, int);
int (*xCheckReservedLock)(OsFile *id);
void (*xSetFullSync)(OsFile *id, int setting);
int (*xFileHandle)(OsFile *id);
int (*xLockState)(OsFile *id);
} sqlite3Io;
/* The interface for file I/O is above. Other miscellaneous functions
** are below */
int (*xRandomSeed)(char*);
int (*xSleep)(int ms);
int (*xCurrentTime)(double*);
void (*xEnterMutex)(void);
void (*xLeaveMutex)(void);
} sqlite3Os;
int sqlite3OsRandomSeed(char*);
int sqlite3OsSleep(int ms);
int sqlite3OsCurrentTime(double*);
void sqlite3OsEnterMutex(void);
void sqlite3OsLeaveMutex(void);
/*
** Prototypes for routines found in os.c
*/
int sqlite3OsClose(OsFile**);
int sqlite3OsOpenDirectory(OsFile*, const char*);
int sqlite3OsRead(OsFile*, void*, int amt);
int sqlite3OsWrite(OsFile*, const void*, int amt);
int sqlite3OsSeek(OsFile*, i64 offset);
int sqlite3OsTruncate(OsFile*, i64 size);
int sqlite3OsSync(OsFile*, int);
void sqlite3OsSetFullSync(OsFile *id, int setting);
int sqlite3OsFileHandle(OsFile *id);
int sqlite3OsFileSize(OsFile*, i64 *pSize);
int sqlite3OsLock(OsFile*, int);
int sqlite3OsUnlock(OsFile*, int);
int sqlite3OsLockState(OsFile *id);
int sqlite3OsCheckReservedLock(OsFile *id);
#endif /* _SQLITE_OS_H_ */