https://origsvn.digium.com/svn/asterisk/branches/1.4 ........ r189391 | dbailey | 2009-04-20 14:10:56 -0500 (Mon, 20 Apr 2009) | 4 lines Clean up problem with manager implementation of mmap where it was not testing against MAP_FAILED response. Got rid of shadowed variable used in processign the mmap results. Change test of mmap results to compare against MAP_FAILED ........ git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@189419 65c4cc65-6c06-0410-ace0-fbb531ad65f3
242 lines
6.6 KiB
C
242 lines
6.6 KiB
C
/*-
|
|
* Copyright (c) 1990, 1993, 1994
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to Berkeley by
|
|
* Mike Olson.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#if defined(LIBC_SCCS) && !defined(lint)
|
|
static char sccsid[] = "@(#)rec_open.c 8.10 (Berkeley) 9/1/94";
|
|
#endif /* LIBC_SCCS and not lint */
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/mman.h>
|
|
#include <sys/stat.h>
|
|
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <limits.h>
|
|
#include <stddef.h>
|
|
#include <stdio.h>
|
|
#include <unistd.h>
|
|
|
|
#include "../include/db.h"
|
|
#include "recno.h"
|
|
|
|
DB *
|
|
__rec_open(fname, flags, mode, openinfo, dflags)
|
|
const char *fname;
|
|
int flags, mode, dflags;
|
|
const RECNOINFO *openinfo;
|
|
{
|
|
BTREE *t;
|
|
BTREEINFO btopeninfo;
|
|
DB *dbp;
|
|
PAGE *h;
|
|
struct stat sb;
|
|
int rfd = 0, sverrno;
|
|
|
|
/* Open the user's file -- if this fails, we're done. */
|
|
if (fname != NULL && (rfd = open(fname, flags, mode)) < 0)
|
|
return (NULL);
|
|
|
|
/* Create a btree in memory (backed by disk). */
|
|
dbp = NULL;
|
|
if (openinfo) {
|
|
if (openinfo->flags & ~(R_FIXEDLEN | R_NOKEY | R_SNAPSHOT))
|
|
goto einval;
|
|
btopeninfo.flags = 0;
|
|
btopeninfo.cachesize = openinfo->cachesize;
|
|
btopeninfo.maxkeypage = 0;
|
|
btopeninfo.minkeypage = 0;
|
|
btopeninfo.psize = openinfo->psize;
|
|
btopeninfo.compare = NULL;
|
|
btopeninfo.prefix = NULL;
|
|
btopeninfo.lorder = openinfo->lorder;
|
|
dbp = __bt_open(openinfo->bfname,
|
|
O_RDWR, S_IRUSR | S_IWUSR, &btopeninfo, dflags);
|
|
} else
|
|
dbp = __bt_open(NULL, O_RDWR, S_IRUSR | S_IWUSR, NULL, dflags);
|
|
if (dbp == NULL)
|
|
goto err;
|
|
|
|
/*
|
|
* Some fields in the tree structure are recno specific. Fill them
|
|
* in and make the btree structure look like a recno structure. We
|
|
* don't change the bt_ovflsize value, it's close enough and slightly
|
|
* bigger.
|
|
*/
|
|
t = dbp->internal;
|
|
if (openinfo) {
|
|
if (openinfo->flags & R_FIXEDLEN) {
|
|
F_SET(t, R_FIXLEN);
|
|
t->bt_reclen = openinfo->reclen;
|
|
if (t->bt_reclen == 0)
|
|
goto einval;
|
|
}
|
|
t->bt_bval = openinfo->bval;
|
|
} else
|
|
t->bt_bval = '\n';
|
|
|
|
F_SET(t, R_RECNO);
|
|
if (fname == NULL)
|
|
F_SET(t, R_EOF | R_INMEM);
|
|
else
|
|
t->bt_rfd = rfd;
|
|
|
|
if (fname != NULL) {
|
|
/*
|
|
* In 4.4BSD, stat(2) returns true for ISSOCK on pipes.
|
|
* Unfortunately, that's not portable, so we use lseek
|
|
* and check the errno values.
|
|
*/
|
|
errno = 0;
|
|
if (lseek(rfd, (off_t)0, SEEK_CUR) == -1 && errno == ESPIPE) {
|
|
switch (flags & O_ACCMODE) {
|
|
case O_RDONLY:
|
|
F_SET(t, R_RDONLY);
|
|
break;
|
|
default:
|
|
goto einval;
|
|
}
|
|
slow: if ((t->bt_rfp = fdopen(rfd, "r")) == NULL)
|
|
goto err;
|
|
F_SET(t, R_CLOSEFP);
|
|
t->bt_irec =
|
|
F_ISSET(t, R_FIXLEN) ? __rec_fpipe : __rec_vpipe;
|
|
} else {
|
|
switch (flags & O_ACCMODE) {
|
|
case O_RDONLY:
|
|
F_SET(t, R_RDONLY);
|
|
break;
|
|
case O_RDWR:
|
|
break;
|
|
default:
|
|
goto einval;
|
|
}
|
|
|
|
if (fstat(rfd, &sb))
|
|
goto err;
|
|
/*
|
|
* Kluge -- we'd like to test to see if the file is too
|
|
* big to mmap. Since, we don't know what size or type
|
|
* off_t's or size_t's are, what the largest unsigned
|
|
* integral type is, or what random insanity the local
|
|
* C compiler will perpetrate, doing the comparison in
|
|
* a portable way is flatly impossible. Hope that mmap
|
|
* fails if the file is too large.
|
|
*/
|
|
if (sb.st_size == 0)
|
|
F_SET(t, R_EOF);
|
|
else {
|
|
#ifdef MMAP_NOT_AVAILABLE
|
|
/*
|
|
* XXX
|
|
* Mmap doesn't work correctly on many current
|
|
* systems. In particular, it can fail subtly,
|
|
* with cache coherency problems. Don't use it
|
|
* for now.
|
|
*/
|
|
t->bt_msize = sb.st_size;
|
|
if ((t->bt_smap = mmap(NULL, t->bt_msize,
|
|
PROT_READ, MAP_PRIVATE, rfd,
|
|
(off_t)0)) == MAP_FAILED
|
|
goto slow;
|
|
t->bt_cmap = t->bt_smap;
|
|
t->bt_emap = t->bt_smap + sb.st_size;
|
|
t->bt_irec = F_ISSET(t, R_FIXLEN) ?
|
|
__rec_fmap : __rec_vmap;
|
|
F_SET(t, R_MEMMAPPED);
|
|
#else
|
|
goto slow;
|
|
#endif
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Use the recno routines. */
|
|
dbp->close = __rec_close;
|
|
dbp->del = __rec_delete;
|
|
dbp->fd = __rec_fd;
|
|
dbp->get = __rec_get;
|
|
dbp->put = __rec_put;
|
|
dbp->seq = __rec_seq;
|
|
dbp->sync = __rec_sync;
|
|
|
|
/* If the root page was created, reset the flags. */
|
|
if ((h = mpool_get(t->bt_mp, P_ROOT, 0)) == NULL)
|
|
goto err;
|
|
if ((h->flags & P_TYPE) == P_BLEAF) {
|
|
F_CLR(h, P_TYPE);
|
|
F_SET(h, P_RLEAF);
|
|
mpool_put(t->bt_mp, h, MPOOL_DIRTY);
|
|
} else
|
|
mpool_put(t->bt_mp, h, 0);
|
|
|
|
if (openinfo && openinfo->flags & R_SNAPSHOT &&
|
|
!F_ISSET(t, R_EOF | R_INMEM) &&
|
|
t->bt_irec(t, MAX_REC_NUMBER) == RET_ERROR)
|
|
goto err;
|
|
return (dbp);
|
|
|
|
einval: errno = EINVAL;
|
|
err: sverrno = errno;
|
|
if (dbp != NULL)
|
|
(void)__bt_close(dbp);
|
|
if (fname != NULL)
|
|
(void)close(rfd);
|
|
errno = sverrno;
|
|
return (NULL);
|
|
}
|
|
|
|
int
|
|
__rec_fd(dbp)
|
|
const DB *dbp;
|
|
{
|
|
BTREE *t;
|
|
|
|
t = dbp->internal;
|
|
|
|
/* Toss any page pinned across calls. */
|
|
if (t->bt_pinned != NULL) {
|
|
mpool_put(t->bt_mp, t->bt_pinned, 0);
|
|
t->bt_pinned = NULL;
|
|
}
|
|
|
|
/* In-memory database can't have a file descriptor. */
|
|
if (F_ISSET(t, R_INMEM)) {
|
|
errno = ENOENT;
|
|
return (-1);
|
|
}
|
|
return (t->bt_rfd);
|
|
}
|