Fix the crashtest infrastructure so that it doesn't trigger the "don't write to the locking region" assert in os_unix.c. (CVS 6281)

FossilOrigin-Name: b7fd4615cd41179484bd44d2f4bd7aef04977911

manifest

@@ -1,5 +1,5 @@
-C Modify\sthe\stest_journal.c\scode\sto\s(1)\saccount\sfor\sthe\sbackup\scode\swriting\sto\sparts\sof\sthe\spending-byte\spage\swhen\schanging\sa\sdatabases\spage-size,\sand\s(2)\sto\savoid\sreading\sfrom\sthe\spending-byte\spage\sand\striggering\sthe\sassert\sin\sos_unix.c.\sChanges\sto\stest\scode\sonly.\s(CVS\s6280)
-D 2009-02-11T07:38:12
+C Fix\sthe\scrashtest\sinfrastructure\sso\sthat\sit\sdoesn't\strigger\sthe\s"don't\swrite\sto\sthe\slocking\sregion"\sassert\sin\sos_unix.c.\s(CVS\s6281)
+D 2009-02-11T14:27:04
 F Makefile.arm-wince-mingw32ce-gcc fcd5e9cd67fe88836360bb4f9ef4cb7f8e2fb5a0
 F Makefile.in c7a5a30fb6852bd7839b1024e1661da8549878ee
 F Makefile.linux-gcc d53183f4aa6a9192d249731c90dbdffbd2c68654
@@ -169,7 +169,7 @@ F src/test2.c 71c22e2974f8094fe0fd1eba8f27872dde9b2a39
 F src/test3.c 88a246b56b824275300e6c899634fbac1dc94b14
 F src/test4.c f79ab52d27ff49b784b631a42e2ccd52cfd5c84c
 F src/test5.c 162a1cea2105a2c460a3f39fa6919617b562a288
-F src/test6.c 86d7918ccc2ff92ceb71cb59c6a078105f8885d2
+F src/test6.c 1a0a7a1f179469044b065b4a88aab9faee114101
 F src/test7.c b94e68c2236de76889d82b8d7d8e00ad6a4d80b1
 F src/test8.c 3637439424d0d21ff2dcf9b015c30fcc1e7bcb24
 F src/test9.c 904ebe0ed1472d6bad17a81e2ecbfc20017dc237
@@ -701,7 +701,7 @@ F tool/speedtest16.c c8a9c793df96db7e4933f0852abb7a03d48f2e81
 F tool/speedtest2.tcl ee2149167303ba8e95af97873c575c3e0fab58ff
 F tool/speedtest8.c 2902c46588c40b55661e471d7a86e4dd71a18224
 F tool/speedtest8inst1.c 293327bc76823f473684d589a8160bde1f52c14e
-P 8b318b9385d0542ca56750b901c0c6b7d05ca634
-R 9a8fca6b31553509b67660a185c0a0d1
+P 4879621658c2c785ab7b12dbae780901496d3a78
+R a8af020a2a79f4fed6aeaceed6fc2c93
 U danielk1977
-Z 710356677aa5921b82da35e3db1360ce
+Z 998a7073c0859344b08ca02f400fe38c

manifest.uuid

@@ -1 +1 @@
-4879621658c2c785ab7b12dbae780901496d3a78
+b7fd4615cd41179484bd44d2f4bd7aef04977911

src/test6.c

@@ -14,7 +14,7 @@
 ** the effect on the database file of an OS crash or power failure.  This
 ** is used to test the ability of SQLite to recover from those situations.
 **
-** $Id: test6.c,v 1.42 2009/02/10 14:28:57 danielk1977 Exp $
+** $Id: test6.c,v 1.43 2009/02/11 14:27:04 danielk1977 Exp $
 */
 #if SQLITE_TEST          /* This file is used for testing only */
 #include "sqliteInt.h"
@@ -129,6 +129,7 @@ struct CrashFile {
   const sqlite3_io_methods *pMethod;   /* Must be first */
   sqlite3_file *pRealFile;             /* Underlying "real" file handle */
   char *zName;
+  int flags;                           /* Flags the file was opened with */
 
   /* Cache of the entire file. This is used to speed up OsRead() and 
   ** OsFileSize() calls. Although both could be done by traversing the
@@ -167,6 +168,22 @@ static void *crash_realloc(void *p, int n){
   return (void *)Tcl_Realloc(p, (size_t)n);
 }
 
+/*
+** Wrapper around the sqlite3OsWrite() function that avoids writing to the
+** 512 byte block begining at offset PENDING_BYTE.
+*/
+static int writeDbFile(CrashFile *p, u8 *z, i64 iAmt, i64 iOff){
+  int rc;
+  int iSkip = 0;
+  if( iOff==PENDING_BYTE && (p->flags&SQLITE_OPEN_MAIN_DB) ){
+    iSkip = 512;
+  }
+  if( (iAmt-iSkip)>0 ){
+    rc = sqlite3OsWrite(p->pRealFile, &z[iSkip], iAmt-iSkip, iOff+iSkip);
+  }
+  return rc;
+}
+
 /*
 ** Flush the write-list as if xSync() had been called on file handle
 ** pFile. If isCrash is true, simulate a crash.
@@ -261,8 +278,8 @@ static int writeListSync(CrashFile *pFile, int isCrash){
     switch( eAction ){
       case 1: {               /* Write out correctly */
         if( pWrite->zBuf ){
-          rc = sqlite3OsWrite(
-              pRealFile, pWrite->zBuf, pWrite->nBuf, pWrite->iOffset
+          rc = writeDbFile(
+              pWrite->pFile, pWrite->zBuf, pWrite->nBuf, pWrite->iOffset
           );
         }else{
           rc = sqlite3OsTruncate(pRealFile, pWrite->iOffset);
@@ -307,8 +324,8 @@ static int writeListSync(CrashFile *pFile, int isCrash){
           sqlite3_int64 i;
           for(i=iFirst; rc==SQLITE_OK && i<=iLast; i++){
             sqlite3_randomness(g.iSectorSize, zGarbage); 
-            rc = sqlite3OsWrite(
-              pRealFile, zGarbage, g.iSectorSize, i*g.iSectorSize
+            rc = writeDbFile(
+              pWrite->pFile, zGarbage, g.iSectorSize, i*g.iSectorSize
             );
           }
           crash_free(zGarbage);
@@ -559,6 +576,7 @@ static int cfOpen(
     pWrapper->pRealFile = pReal;
     rc = sqlite3OsFileSize(pReal, &iSize);
     pWrapper->iSize = (int)iSize;
+    pWrapper->flags = flags;
   }
   if( rc==SQLITE_OK ){
     pWrapper->nData = (4096 + pWrapper->iSize);