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ecd3459e | 1 | /* read.c -- File views without mmap. |
fbd26352 | 2 | Copyright (C) 2012-2019 Free Software Foundation, Inc. |
ecd3459e | 3 | Written by Ian Lance Taylor, Google. |
4 | ||
5 | Redistribution and use in source and binary forms, with or without | |
6 | modification, are permitted provided that the following conditions are | |
7 | met: | |
8 | ||
9 | (1) Redistributions of source code must retain the above copyright | |
75c399ef | 10 | notice, this list of conditions and the following disclaimer. |
ecd3459e | 11 | |
12 | (2) Redistributions in binary form must reproduce the above copyright | |
13 | notice, this list of conditions and the following disclaimer in | |
14 | the documentation and/or other materials provided with the | |
75c399ef | 15 | distribution. |
16 | ||
ecd3459e | 17 | (3) The name of the author may not be used to |
18 | endorse or promote products derived from this software without | |
19 | specific prior written permission. | |
20 | ||
21 | THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
22 | IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED | |
23 | WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
24 | DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, | |
25 | INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES | |
26 | (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR | |
27 | SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
28 | HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
29 | STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING | |
30 | IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
31 | POSSIBILITY OF SUCH DAMAGE. */ | |
32 | ||
33 | #include "config.h" | |
34 | ||
35 | #include <errno.h> | |
36 | #include <stdlib.h> | |
37 | #include <sys/types.h> | |
38 | #include <unistd.h> | |
39 | ||
40 | #include "backtrace.h" | |
41 | #include "internal.h" | |
42 | ||
43 | /* This file implements file views when mmap is not available. */ | |
44 | ||
45 | /* Create a view of SIZE bytes from DESCRIPTOR at OFFSET. */ | |
46 | ||
47 | int | |
48 | backtrace_get_view (struct backtrace_state *state, int descriptor, | |
432ce2bc | 49 | off_t offset, uint64_t size, |
ecd3459e | 50 | backtrace_error_callback error_callback, |
51 | void *data, struct backtrace_view *view) | |
52 | { | |
53 | ssize_t got; | |
54 | ||
432ce2bc | 55 | if ((uint64_t) (size_t) size != size) |
56 | { | |
57 | error_callback (data, "file size too large", 0); | |
58 | return 0; | |
59 | } | |
60 | ||
ecd3459e | 61 | if (lseek (descriptor, offset, SEEK_SET) < 0) |
62 | { | |
63 | error_callback (data, "lseek", errno); | |
64 | return 0; | |
65 | } | |
66 | ||
67 | view->base = backtrace_alloc (state, size, error_callback, data); | |
68 | if (view->base == NULL) | |
69 | return 0; | |
70 | view->data = view->base; | |
71 | view->len = size; | |
72 | ||
73 | got = read (descriptor, view->base, size); | |
74 | if (got < 0) | |
75 | { | |
76 | error_callback (data, "read", errno); | |
77 | free (view->base); | |
78 | return 0; | |
79 | } | |
80 | ||
81 | if ((size_t) got < size) | |
82 | { | |
83 | error_callback (data, "file too short", 0); | |
84 | free (view->base); | |
85 | return 0; | |
86 | } | |
87 | ||
88 | return 1; | |
89 | } | |
90 | ||
91 | /* Release a view read by backtrace_get_view. */ | |
92 | ||
93 | void | |
94 | backtrace_release_view (struct backtrace_state *state, | |
95 | struct backtrace_view *view, | |
96 | backtrace_error_callback error_callback, | |
97 | void *data) | |
98 | { | |
99 | backtrace_free (state, view->base, view->len, error_callback, data); | |
100 | view->data = NULL; | |
101 | view->base = NULL; | |
102 | } |