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Overview
| Comment: | Take care not to modify the sqlite* pointer to sqlite_exec() if we suspect that the pointer is stale - that it has previously been passed to sqlite_close(). Possible fix for ticket #202. Prior to this fix, test misuse-5.3 was causing a change to a buffer that had been previously free()-ed. (CVS 799) |
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| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
f04547edfa1643ce52925d317915badf |
| User & Date: | drh 2002-12-17 13:05:26 |
Context
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2002-12-17
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| 14:13 | Make sure the host machine has enough disk space before running the large file tests. (CVS 800) (check-in: b1ec5478 user: drh tags: trunk) | |
| 13:05 | Take care not to modify the sqlite* pointer to sqlite_exec() if we suspect that the pointer is stale - that it has previously been passed to sqlite_close(). Possible fix for ticket #202. Prior to this fix, test misuse-5.3 was causing a change to a buffer that had been previously free()-ed. (CVS 799) (check-in: f04547ed user: drh tags: trunk) | |
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2002-12-07
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| 21:45 | Save the full pathname of the database file so that journalling still works even if the user changes working directories after opening the databae. Ticket #200. (CVS 798) (check-in: 1c58b4fc user: drh tags: trunk) | |
Changes
Changes to src/util.c.
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** ************************************************************************* ** Utility functions used throughout sqlite. ** ** This file contains functions for allocating memory, comparing ** strings, and stuff like that. ** ** $Id: util.c,v 1.52 2002/10/20 15:46:23 drh Exp $ */ #include "sqliteInt.h" #include <stdarg.h> #include <ctype.h> /* ** If malloc() ever fails, this global variable gets set to 1. ................................................................................ ** ** This routine is a attempt to detect if two threads use the ** same sqlite* pointer at the same time. There is a race ** condition so it is possible that the error is not detected. ** But usually the problem will be seen. The result will be an ** error which can be used to debug the application that is ** using SQLite incorrectly. */ int sqliteSafetyOn(sqlite *db){ if( db->magic==SQLITE_MAGIC_OPEN ){ db->magic = SQLITE_MAGIC_BUSY; return 0; }else{ db->magic = SQLITE_MAGIC_ERROR; db->flags |= SQLITE_Interrupt; return 1; } } /* ** Change the magic from SQLITE_MAGIC_BUSY to SQLITE_MAGIC_OPEN. ** Return an error (non-zero) if the magic was not SQLITE_MAGIC_BUSY ** when this routine is called. */ int sqliteSafetyOff(sqlite *db){ if( db->magic==SQLITE_MAGIC_BUSY ){ db->magic = SQLITE_MAGIC_OPEN; return 0; }else{ db->magic = SQLITE_MAGIC_ERROR; db->flags |= SQLITE_Interrupt; return 1; } } /* ** Check to make sure we are not currently executing an sqlite_exec(). ** If we are currently in an sqlite_exec(), return true and set ** sqlite.magic to SQLITE_MAGIC_ERROR. This will cause a complete ** shutdown of the database. |
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** ************************************************************************* ** Utility functions used throughout sqlite. ** ** This file contains functions for allocating memory, comparing ** strings, and stuff like that. ** ** $Id: util.c,v 1.53 2002/12/17 13:05:26 drh Exp $ */ #include "sqliteInt.h" #include <stdarg.h> #include <ctype.h> /* ** If malloc() ever fails, this global variable gets set to 1. ................................................................................ ** ** This routine is a attempt to detect if two threads use the ** same sqlite* pointer at the same time. There is a race ** condition so it is possible that the error is not detected. ** But usually the problem will be seen. The result will be an ** error which can be used to debug the application that is ** using SQLite incorrectly. ** ** Ticket #202: If db->magic is not a valid open value, take care not ** to modify the db structure at all. It could be that db is a stale ** pointer. In other words, it could be that there has been a prior ** call to sqlite_close(db) and db has been deallocated. And we do ** not want to write into deallocated memory. */ int sqliteSafetyOn(sqlite *db){ if( db->magic==SQLITE_MAGIC_OPEN ){ db->magic = SQLITE_MAGIC_BUSY; return 0; }else if( db->magic==SQLITE_MAGIC_BUSY || db->magic==SQLITE_MAGIC_ERROR ){ db->magic = SQLITE_MAGIC_ERROR; db->flags |= SQLITE_Interrupt; } return 1; } /* ** Change the magic from SQLITE_MAGIC_BUSY to SQLITE_MAGIC_OPEN. ** Return an error (non-zero) if the magic was not SQLITE_MAGIC_BUSY ** when this routine is called. */ int sqliteSafetyOff(sqlite *db){ if( db->magic==SQLITE_MAGIC_BUSY ){ db->magic = SQLITE_MAGIC_OPEN; return 0; }else if( db->magic==SQLITE_MAGIC_OPEN || db->magic==SQLITE_MAGIC_ERROR ){ db->magic = SQLITE_MAGIC_ERROR; db->flags |= SQLITE_Interrupt; } return 1; } /* ** Check to make sure we are not currently executing an sqlite_exec(). ** If we are currently in an sqlite_exec(), return true and set ** sqlite.magic to SQLITE_MAGIC_ERROR. This will cause a complete ** shutdown of the database. |