|
111
|
1 /* read.c -- File views without mmap.
|
|
145
|
2 Copyright (C) 2012-2020 Free Software Foundation, Inc.
|
|
111
|
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
|
|
|
10 notice, this list of conditions and the following disclaimer.
|
|
|
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
|
|
|
15 distribution.
|
|
|
16
|
|
|
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,
|
|
145
|
49 off_t offset, uint64_t size,
|
|
111
|
50 backtrace_error_callback error_callback,
|
|
|
51 void *data, struct backtrace_view *view)
|
|
|
52 {
|
|
|
53 ssize_t got;
|
|
|
54
|
|
145
|
55 if ((uint64_t) (size_t) size != size)
|
|
|
56 {
|
|
|
57 error_callback (data, "file size too large", 0);
|
|
|
58 return 0;
|
|
|
59 }
|
|
|
60
|
|
111
|
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 }
|
