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Updated comments on journal.c. No changes to code. (CVS 4408)

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FossilOrigin-Name: 3298441086330d1d24c30b7c061dfec98e9ea3ac
This commit is contained in:
drh
2007-09-06 13:49:37 +00:00
parent bd468510ee
commit 24e824c4eb
3 changed files with 35 additions and 32 deletions
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51
src/journal.c
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@@ -10,7 +10,7 @@
**
*************************************************************************
**
** @(#) $Id: journal.c,v 1.6 2007/09/03 15:19:35 drh Exp $
** @(#) $Id: journal.c,v 1.7 2007/09/06 13:49:37 drh Exp $
*/
#ifdef SQLITE_ENABLE_ATOMIC_WRITE
@@ -33,17 +33,20 @@
#include "sqliteInt.h"
/*
** A JournalFile object is a subclass of sqlite3_file used by
** as an open file handle for journal files.
*/
struct JournalFile {
sqlite3_io_methods *pMethod;
int nBuf;
char *zBuf;
int iSize;
int flags;
sqlite3_vfs *pVfs;
sqlite3_file *pReal;
const char *zJournal;
sqlite3_io_methods *pMethod; /* I/O methods on journal files */
int nBuf; /* Size of zBuf[] in bytes */
char *zBuf; /* Space to buffer journal writes */
int iSize; /* Amount of zBuf[] currently used */
int flags; /* xOpen flags */
sqlite3_vfs *pVfs; /* The "real" underlying VFS */
sqlite3_file *pReal; /* The "real" underlying file descriptor */
const char *zJournal; /* Name of the journal file */
};
typedef struct JournalFile JournalFile;
@@ -83,10 +86,10 @@ static int jrnlClose(sqlite3_file *pJfd){
** Read data from the file.
*/
static int jrnlRead(
sqlite3_file *pJfd,
void *zBuf,
int iAmt,
sqlite_int64 iOfst
sqlite3_file *pJfd, /* The journal file from which to read */
void *zBuf, /* Put the results here */
int iAmt, /* Number of bytes to read */
sqlite_int64 iOfst /* Begin reading at this offset */
){
int rc = SQLITE_OK;
JournalFile *p = (JournalFile *)pJfd;
@@ -103,10 +106,10 @@ static int jrnlRead(
** Write data to the file.
*/
static int jrnlWrite(
sqlite3_file *pJfd,
const void *zBuf,
int iAmt,
sqlite_int64 iOfst
sqlite3_file *pJfd, /* The journal file into which to write */
const void *zBuf, /* Take data to be written from here */
int iAmt, /* Number of bytes to write */
sqlite_int64 iOfst /* Begin writing at this offset into the file */
){
int rc = SQLITE_OK;
JournalFile *p = (JournalFile *)pJfd;
@@ -190,11 +193,11 @@ static struct sqlite3_io_methods JournalFileMethods = {
** Open a journal file.
*/
int sqlite3JournalOpen(
sqlite3_vfs *pVfs,
const char *zName,
sqlite3_file *pJfd,
int flags,
int nBuf
sqlite3_vfs *pVfs, /* The VFS to use for actual file I/O */
const char *zName, /* Name of the journal file */
sqlite3_file *pJfd, /* Preallocated, blank file handle */
int flags, /* Opening flags */
int nBuf /* Bytes buffered before opening the file */
){
JournalFile *p = (JournalFile *)pJfd;
memset(p, 0, sqlite3JournalSize(pVfs));