1 #pragma ident "%Z%%M% %I% %E% SMI" 2 3 /*- 4 * Copyright (c) 1990, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Mike Olson. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 */ 38 39 #if defined(LIBC_SCCS) && !defined(lint) 40 static char sccsid[] = "@(#)bt_get.c 8.6 (Berkeley) 7/20/94"; 41 #endif /* LIBC_SCCS and not lint */ 42 43 #include <sys/types.h> 44 45 #include <errno.h> 46 #include <stddef.h> 47 #include <stdio.h> 48 49 #include "db-int.h" 50 #include "btree.h" 51 52 /* 53 * __BT_GET -- Get a record from the btree. 54 * 55 * Parameters: 56 * dbp: pointer to access method 57 * key: key to find 58 * data: data to return 59 * flag: currently unused 60 * 61 * Returns: 62 * RET_ERROR, RET_SUCCESS and RET_SPECIAL if the key not found. 63 */ 64 int 65 __bt_get(dbp, key, data, flags) 66 const DB *dbp; 67 const DBT *key; 68 DBT *data; 69 u_int flags; 70 { 71 BTREE *t; 72 EPG *e; 73 int exact, status; 74 75 t = dbp->internal; 76 77 /* Toss any page pinned across calls. */ 78 if (t->bt_pinned != NULL) { 79 mpool_put(t->bt_mp, t->bt_pinned, 0); 80 t->bt_pinned = NULL; 81 } 82 83 /* Get currently doesn't take any flags. */ 84 if (flags) { 85 errno = EINVAL; 86 return (RET_ERROR); 87 } 88 89 if ((e = __bt_search(t, key, &exact)) == NULL) 90 return (RET_ERROR); 91 if (!exact) { 92 mpool_put(t->bt_mp, e->page, 0); 93 return (RET_SPECIAL); 94 } 95 96 status = __bt_ret(t, e, NULL, NULL, data, &t->bt_rdata, 0); 97 98 /* 99 * If the user is doing concurrent access, we copied the 100 * key/data, toss the page. 101 */ 102 if (F_ISSET(t, B_DB_LOCK)) 103 mpool_put(t->bt_mp, e->page, 0); 104 else 105 t->bt_pinned = e->page; 106 return (status); 107 } 108