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Annotation of 42BSD/ingres/source/dbu/destroy.c, revision 1.1

1.1     ! root        1: # include      <pv.h>
        !             2: # include      <ingres.h>
        !             3: # include      <aux.h>
        !             4: # include      <catalog.h>
        !             5: # include      <func.h>
        !             6: # include      <sccs.h>
        !             7: 
        !             8: SCCSID(@(#)destroy.c   7.1     2/5/81)
        !             9: 
        !            10: extern short   tTdbu[];
        !            11: extern int     destroy();
        !            12: extern         int     null_fn();
        !            13: 
        !            14: struct fn_def DstroyFn =
        !            15: {
        !            16:        "DESTROY",
        !            17:        destroy,
        !            18:        null_fn,
        !            19:        null_fn,
        !            20:        NULL,
        !            21:        0,
        !            22:        tTdbu,
        !            23:        100,
        !            24:        'Z',
        !            25:        0
        !            26: };
        !            27: 
        !            28: 
        !            29: /*
        !            30: **  DESTROY RELATION
        !            31: **
        !            32: **     The relations in pv are destroyed.  This involves three steps:
        !            33: **     1 - remove tuple from relation relation
        !            34: **     2 - remove tuples from attribute relation
        !            35: **     3 - unlink physical file
        !            36: **
        !            37: **     If the relation is a secondary index, the entry is removed
        !            38: **     from the index relation, and the primary relation is set to
        !            39: **     be "not indexed" (unless there is another index on it).
        !            40: **
        !            41: **     If the relation has an index, all its indexes are also
        !            42: **     destroyed.
        !            43: **
        !            44: **     If any errors occured while destroying the relations,
        !            45: **     then the last error number is returned, otherwise
        !            46: **     0 is returned.
        !            47: **
        !            48: **     If any query modification was defined on the relation,
        !            49: **     the qrymod catalogues are updated.
        !            50: **
        !            51: **     Trace Flags:
        !            52: **             32
        !            53: */
        !            54: 
        !            55: destroy(pc, pv)
        !            56: int    pc;
        !            57: PARM   *pv;
        !            58: {
        !            59:        register int    i, ret;
        !            60:        register char   *name;
        !            61: 
        !            62:        opencatalog("relation", 2);
        !            63:        opencatalog("attribute", 2);
        !            64: 
        !            65:        for (ret = 0; pc-- > 0; )
        !            66:        {
        !            67:                name = ((pv++)->pv_val).pv_str;
        !            68:                if (i = des(name))
        !            69:                        ret = i;
        !            70:        }
        !            71:        return (ret);
        !            72: }
        !            73: 
        !            74: 
        !            75: des(name)
        !            76: char   *name;
        !            77: {
        !            78:        register int    i;
        !            79:        register char   *relname;
        !            80:        struct tup_id   tid;
        !            81:        char            newrelname[MAXNAME + 3];
        !            82:        extern DESC     Reldes, Attdes, Inddes, Treedes;
        !            83:        struct relation relt, relk;
        !            84: 
        !            85:        relname = name;
        !            86: #      ifdef xZTR1
        !            87:        tTfp(32, -1, "destroy: %s\n", relname);
        !            88: #      endif
        !            89: 
        !            90:        newrelname[MAXNAME + 2] = 0;
        !            91: 
        !            92:        /* get the tuple from relation relation */
        !            93:        setkey(&Reldes, &relk, relname, RELID);
        !            94:        setkey(&Reldes, &relk, Usercode, RELOWNER);
        !            95:        if ((i = getequal(&Reldes, &relk, &relt, &tid)) != 0)
        !            96:        {
        !            97:                if (i < 0)
        !            98:                        syserr("DESTROY: geteq(rel/%s) %d", relname, i);
        !            99:                return (nferror(5202, relname, 0));     /* nonexistant relation */
        !           100:        }
        !           101: 
        !           102:        /* don't allow a system relation to be destroyed */
        !           103:        if (relt.relstat & S_CATALOG)
        !           104:                return (nferror(5201, relname, 0));     /* attempt to destroy system catalog */
        !           105: 
        !           106:        if ((i = delete(&Reldes, &tid)) != 0)
        !           107:                syserr("DESTROY: delete(rel) %d", i);
        !           108: 
        !           109:        /*
        !           110:        ** for concurrency reasons, flush the relation-relation page
        !           111:        ** where the tuple was just deleted. This will prevent anyone
        !           112:        ** from being able to "openr" the relation while it is being
        !           113:        ** destroyed. It also allows recovery to finish the destroy
        !           114:        ** it the system crashes during this destroy.
        !           115:        */
        !           116:        if (i = flush_rel(&Reldes, FALSE))
        !           117:                syserr("destroy:flush rel %d", i);
        !           118: 
        !           119:        purgetup(&Attdes, relt.relid, ATTRELID, relt.relowner, ATTOWNER, 0);
        !           120: 
        !           121:        /*
        !           122:        **      If this is a user relation, then additional processing
        !           123:        **      might be needed to clean up indicies, protection constraints
        !           124:        **      etc.
        !           125:        */
        !           126:        if ((relt.relstat & S_CATALOG) == 0)
        !           127:                userdestroy(&relt);
        !           128: 
        !           129:        if ((relt.relstat & S_VIEW) == 0)
        !           130:        {
        !           131:                ingresname(relname, Usercode, newrelname);
        !           132:                if (unlink(newrelname) < 0)
        !           133:                        syserr("destroy: unlink(%.14s)", newrelname);
        !           134:        }
        !           135:        return (0);
        !           136: 
        !           137: }

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