1 /* $NetBSD: bt_get.c,v 1.9 1997/07/21 14:06:32 jtc 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 #include <sys/cdefs.h> 40 #if defined(LIBC_SCCS) && !defined(lint) 41 #if 0 42 static char sccsid[] = "@(#)bt_get.c 8.6 (Berkeley) 7/20/94"; 43 #else 44 __RCSID("$NetBSD: bt_get.c,v 1.9 1997/07/21 14:06:32 jtc Exp $"); 45 #endif 46 #endif /* LIBC_SCCS and not lint */ 47 48 #include "namespace.h" 49 #include <sys/types.h> 50 51 #include <errno.h> 52 #include <stddef.h> 53 #include <stdio.h> 54 55 #include <db.h> 56 #include "btree.h" 57 58 /* 59 * __BT_GET -- Get a record from the btree. 60 * 61 * Parameters: 62 * dbp: pointer to access method 63 * key: key to find 64 * data: data to return 65 * flag: currently unused 66 * 67 * Returns: 68 * RET_ERROR, RET_SUCCESS and RET_SPECIAL if the key not found. 69 */ 70 int 71 __bt_get(dbp, key, data, flags) 72 const DB *dbp; 73 const DBT *key; 74 DBT *data; 75 u_int flags; 76 { 77 BTREE *t; 78 EPG *e; 79 int exact, status; 80 81 t = dbp->internal; 82 83 /* Toss any page pinned across calls. */ 84 if (t->bt_pinned != NULL) { 85 mpool_put(t->bt_mp, t->bt_pinned, 0); 86 t->bt_pinned = NULL; 87 } 88 89 /* Get currently doesn't take any flags. */ 90 if (flags) { 91 errno = EINVAL; 92 return (RET_ERROR); 93 } 94 95 if ((e = __bt_search(t, key, &exact)) == NULL) 96 return (RET_ERROR); 97 if (!exact) { 98 mpool_put(t->bt_mp, e->page, 0); 99 return (RET_SPECIAL); 100 } 101 102 status = __bt_ret(t, e, NULL, NULL, data, &t->bt_rdata, 0); 103 104 /* 105 * If the user is doing concurrent access, we copied the 106 * key/data, toss the page. 107 */ 108 if (F_ISSET(t, B_DB_LOCK)) 109 mpool_put(t->bt_mp, e->page, 0); 110 else 111 t->bt_pinned = e->page; 112 return (status); 113 } 114