1 /* $OpenBSD: bt_get.c,v 1.5 2003/05/01 20:23:40 avsm Exp $ */ 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 #if 0 41 static char sccsid[] = "@(#)bt_get.c 8.6 (Berkeley) 7/20/94"; 42 #else 43 static const char rcsid[] = "$OpenBSD: bt_get.c,v 1.5 2003/05/01 20:23:40 avsm Exp $"; 44 #endif 45 #endif /* LIBC_SCCS and not lint */ 46 47 #include <sys/types.h> 48 49 #include <errno.h> 50 #include <stddef.h> 51 #include <stdio.h> 52 53 #include <db.h> 54 #include "btree.h" 55 56 /* 57 * __BT_GET -- Get a record from the btree. 58 * 59 * Parameters: 60 * dbp: pointer to access method 61 * key: key to find 62 * data: data to return 63 * flag: currently unused 64 * 65 * Returns: 66 * RET_ERROR, RET_SUCCESS and RET_SPECIAL if the key not found. 67 */ 68 int 69 __bt_get(dbp, key, data, flags) 70 const DB *dbp; 71 const DBT *key; 72 DBT *data; 73 u_int flags; 74 { 75 BTREE *t; 76 EPG *e; 77 int exact, status; 78 79 t = dbp->internal; 80 81 /* Toss any page pinned across calls. */ 82 if (t->bt_pinned != NULL) { 83 mpool_put(t->bt_mp, t->bt_pinned, 0); 84 t->bt_pinned = NULL; 85 } 86 87 /* Get currently doesn't take any flags. */ 88 if (flags) { 89 errno = EINVAL; 90 return (RET_ERROR); 91 } 92 93 if ((e = __bt_search(t, key, &exact)) == NULL) 94 return (RET_ERROR); 95 if (!exact) { 96 mpool_put(t->bt_mp, e->page, 0); 97 return (RET_SPECIAL); 98 } 99 100 status = __bt_ret(t, e, NULL, NULL, data, &t->bt_rdata, 0); 101 102 /* 103 * If the user is doing concurrent access, we copied the 104 * key/data, toss the page. 105 */ 106 if (F_ISSET(t, B_DB_LOCK)) 107 mpool_put(t->bt_mp, e->page, 0); 108 else 109 t->bt_pinned = e->page; 110 return (status); 111 } 112