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path: root/kmicromail/libetpan/tools/mapping.c
authorzautrix <zautrix>2004-07-03 16:33:12 (UTC)
committer zautrix <zautrix>2004-07-03 16:33:12 (UTC)
commite3b89230f065c48c84b48c88edb6eb088374c487 (patch) (unidiff)
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1/*
2 * libEtPan! -- a mail stuff library
3 *
4 * Copyright (C) 2001, 2002 - DINH Viet Hoa
5 * 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. Neither the name of the libEtPan! project nor the names of its
16 * contributors may be used to endorse or promote products derived
17 * from this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32/*
33 * $Id$
34 */
35
36#include "mapping.h"
37
38#include <unistd.h>
39#include <sys/mman.h>
40
41int get_mapping(size_t length, int prot, int flags,
42 int fd, off_t offset,
43 void ** presult, void ** pmapping, size_t * pmapping_size)
44{
45 void * mapping;
46 size_t mapping_size;
47 void * result;
48 size_t page_size;
49 off_t delta;
50
51 page_size = getpagesize();
52 delta = offset % page_size;
53
54 mapping = mmap(NULL, length + offset, prot, flags, fd, offset - delta);
55 if (mapping == MAP_FAILED)
56 return -1;
57
58 result = ((char *) mapping) + delta;
59
60 mapping_size = length + offset;
61
62 * pmapping = mapping;
63 * pmapping_size = mapping_size;
64 * presult = result;
65
66 return 0;
67}