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rec_close.c revision 1.6 
      1 /*	$NetBSD: rec_close.c,v 1.6 1995/02/27 13:24:37 cgd Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1990, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #if defined(LIBC_SCCS) && !defined(lint)
     37 #if 0
     38 static char sccsid[] = "@(#)rec_close.c	8.3 (Berkeley) 2/21/94";
     39 #else
     40 static char rcsid[] = "$NetBSD: rec_close.c,v 1.6 1995/02/27 13:24:37 cgd Exp $";
     41 #endif
     42 #endif /* LIBC_SCCS and not lint */
     43 
     44 #include <sys/types.h>
     45 #include <sys/uio.h>
     46 #include <sys/mman.h>
     47 
     48 #include <errno.h>
     49 #include <limits.h>
     50 #include <stdio.h>
     51 #include <unistd.h>
     52 
     53 #include <db.h>
     54 #include "recno.h"
     55 
     56 /*
     57  * __REC_CLOSE -- Close a recno tree.
     58  *
     59  * Parameters:
     60  *	dbp:	pointer to access method
     61  *
     62  * Returns:
     63  *	RET_ERROR, RET_SUCCESS
     64  */
     65 int
     66 __rec_close(dbp)
     67 	DB *dbp;
     68 {
     69 	BTREE *t;
     70 	int status;
     71 
     72 	t = dbp->internal;
     73 
     74 	/* Toss any page pinned across calls. */
     75 	if (t->bt_pinned != NULL) {
     76 		mpool_put(t->bt_mp, t->bt_pinned, 0);
     77 		t->bt_pinned = NULL;
     78 	}
     79 
     80 	if (__rec_sync(dbp, 0) == RET_ERROR)
     81 		return (RET_ERROR);
     82 
     83 	/* Committed to closing. */
     84 	status = RET_SUCCESS;
     85 	if (ISSET(t, R_MEMMAPPED) && munmap(t->bt_smap, t->bt_msize))
     86 		status = RET_ERROR;
     87 
     88 	if (!ISSET(t, R_INMEM))
     89 		if (ISSET(t, R_CLOSEFP)) {
     90 			if (fclose(t->bt_rfp))
     91 				status = RET_ERROR;
     92 		} else
     93 			if (close(t->bt_rfd))
     94 				status = RET_ERROR;
     95 
     96 	if (__bt_close(dbp) == RET_ERROR)
     97 		status = RET_ERROR;
     98 
     99 	return (status);
    100 }
    101 
    102 /*
    103  * __REC_SYNC -- sync the recno tree to disk.
    104  *
    105  * Parameters:
    106  *	dbp:	pointer to access method
    107  *
    108  * Returns:
    109  *	RET_SUCCESS, RET_ERROR.
    110  */
    111 int
    112 __rec_sync(dbp, flags)
    113 	const DB *dbp;
    114 	u_int flags;
    115 {
    116 	struct iovec iov[2];
    117 	BTREE *t;
    118 	DBT data, key;
    119 	off_t off;
    120 	recno_t scursor, trec;
    121 	int status;
    122 
    123 	t = dbp->internal;
    124 
    125 	/* Toss any page pinned across calls. */
    126 	if (t->bt_pinned != NULL) {
    127 		mpool_put(t->bt_mp, t->bt_pinned, 0);
    128 		t->bt_pinned = NULL;
    129 	}
    130 
    131 	if (flags == R_RECNOSYNC)
    132 		return (__bt_sync(dbp, 0));
    133 
    134 	if (ISSET(t, R_RDONLY | R_INMEM) || !ISSET(t, R_MODIFIED))
    135 		return (RET_SUCCESS);
    136 
    137 	/* Read any remaining records into the tree. */
    138 	if (!ISSET(t, R_EOF) && t->bt_irec(t, MAX_REC_NUMBER) == RET_ERROR)
    139 		return (RET_ERROR);
    140 
    141 	/* Rewind the file descriptor. */
    142 	if (lseek(t->bt_rfd, (off_t)0, SEEK_SET) != 0)
    143 		return (RET_ERROR);
    144 
    145 	iov[1].iov_base = "\n";
    146 	iov[1].iov_len = 1;
    147 	scursor = t->bt_rcursor;
    148 
    149 	key.size = sizeof(recno_t);
    150 	key.data = &trec;
    151 
    152 	status = (dbp->seq)(dbp, &key, &data, R_FIRST);
    153         while (status == RET_SUCCESS) {
    154 		iov[0].iov_base = data.data;
    155 		iov[0].iov_len = data.size;
    156 		if (writev(t->bt_rfd, iov, 2) != data.size + 1)
    157 			return (RET_ERROR);
    158                 status = (dbp->seq)(dbp, &key, &data, R_NEXT);
    159         }
    160 	t->bt_rcursor = scursor;
    161 	if (status == RET_ERROR)
    162 		return (RET_ERROR);
    163 	if ((off = lseek(t->bt_rfd, (off_t)0, SEEK_CUR)) == -1)
    164 		return (RET_ERROR);
    165 	if (ftruncate(t->bt_rfd, off))
    166 		return (RET_ERROR);
    167 	CLR(t, R_MODIFIED);
    168 	return (RET_SUCCESS);
    169 }
    170