2N/A * Copyright (c) 1990, 1993, 1994 2N/A * The Regents of the University of California. All rights reserved. 2N/A * This code is derived from software contributed to Berkeley by 2N/A * Redistribution and use in source and binary forms, with or without 2N/A * modification, are permitted provided that the following conditions 2N/A * 1. Redistributions of source code must retain the above copyright 2N/A * notice, this list of conditions and the following disclaimer. 2N/A * 2. Redistributions in binary form must reproduce the above copyright 2N/A * notice, this list of conditions and the following disclaimer in the 2N/A * documentation and/or other materials provided with the distribution. 2N/A * 3. All advertising materials mentioning features or use of this software 2N/A * must display the following acknowledgement: 2N/A * This product includes software developed by the University of 2N/A * California, Berkeley and its contributors. 2N/A * 4. Neither the name of the University nor the names of its contributors 2N/A * may be used to endorse or promote products derived from this software 2N/A * without specific prior written permission. 2N/A * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 2N/A * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2N/A * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2N/A * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 2N/A * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2N/A * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2N/A * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2N/A * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2N/A * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2N/A * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2N/A#
endif /* LIBC_SCCS and not lint */ 2N/A /* Open the user's file -- if this fails, we're done. */ 2N/A /* Create a btree in memory (backed by disk). */ 2N/A * Some fields in the tree structure are recno specific. Fill them 2N/A * in and make the btree structure look like a recno structure. We 2N/A * don't change the bt_ovflsize value, it's close enough and slightly 2N/A * In 4.4BSD, stat(2) returns true for ISSOCK on pipes. 2N/A * Unfortunately, that's not portable, so we use lseek 2N/A * and check the errno values. 2N/A * Kluge -- we'd like to test to see if the file is too 2N/A * big to mmap. Since, we don't know what size or type 2N/A * off_t's or size_t's are, what the largest unsigned 2N/A * integral type is, or what random insanity the local 2N/A * C compiler will perpetrate, doing the comparison in 2N/A * a portable way is flatly impossible. Hope that mmap 2N/A * fails if the file is too large. 2N/A * Mmap doesn't work correctly on many current 2N/A * systems. In particular, it can fail subtly, 2N/A * with cache coherency problems. Don't use it 2N/A /* Use the recno routines. */ 2N/A /* If the root page was created, reset the flags. */ 2N/A /* Toss any page pinned across calls. */ 2N/A /* In-memory database can't have a file descriptor. */