I want to analyze the executive process of wal-file with the source code
3.16.2 .
And I added:
unixFile *pFd = (unixFile *)pRet->pWalFd;
if(pFd->nFetchOut != 0){
printf("hi\n");
}
to sqlite3WalOpen() after sqlite3OsOpen() is called:
rc = sqlite3OsOpen(pVfs, zWalName, pRet->pWalFd, vfsFlags, &vfsFlags);
I think sqlite3OsOpen() should open the pWalFd file and set the most of its
member elements in struct unixFile to 0. But I saw so many 'hi' when I ran
the TCL test of sqlite, especially in e_walckpt.test, wal.test and
wal2.test.
I find nFetchOut has been correctly initialized after fillInUnixFile() is
called before unixOpen() returned. But nFetchOut, and sometimes zPath,
mmapSize and other data elements seem to have an incorrect value when I
check it after sqliteOsOpen().
Is it right? And why?
Thanks
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