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eff02e4f | 1 | /* posix.c -- POSIX file I/O routines for the backtrace library. |
8d9254fc | 2 | Copyright (C) 2012-2020 Free Software Foundation, Inc. |
eff02e4f ILT |
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 | |
84ebf639 | 10 | notice, this list of conditions and the following disclaimer. |
eff02e4f ILT |
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 | |
84ebf639 CL |
15 | distribution. |
16 | ||
eff02e4f ILT |
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 <sys/types.h> | |
37 | #include <sys/stat.h> | |
38 | #include <fcntl.h> | |
39 | #include <unistd.h> | |
40 | ||
41 | #include "backtrace.h" | |
42 | #include "internal.h" | |
43 | ||
3319ef17 ILT |
44 | #ifndef O_BINARY |
45 | #define O_BINARY 0 | |
46 | #endif | |
47 | ||
eff02e4f ILT |
48 | #ifndef O_CLOEXEC |
49 | #define O_CLOEXEC 0 | |
50 | #endif | |
51 | ||
52 | #ifndef FD_CLOEXEC | |
53 | #define FD_CLOEXEC 1 | |
54 | #endif | |
55 | ||
56 | /* Open a file for reading. */ | |
57 | ||
58 | int | |
59 | backtrace_open (const char *filename, backtrace_error_callback error_callback, | |
73f41491 | 60 | void *data, int *does_not_exist) |
eff02e4f ILT |
61 | { |
62 | int descriptor; | |
63 | ||
73f41491 ILT |
64 | if (does_not_exist != NULL) |
65 | *does_not_exist = 0; | |
66 | ||
750cdaf7 | 67 | descriptor = open (filename, (int) (O_RDONLY | O_BINARY | O_CLOEXEC)); |
eff02e4f ILT |
68 | if (descriptor < 0) |
69 | { | |
702adbb2 ILT |
70 | /* If DOES_NOT_EXIST is not NULL, then don't call ERROR_CALLBACK |
71 | if the file does not exist. We treat lacking permission to | |
72 | open the file as the file not existing; this case arises when | |
73 | running the libgo syscall package tests as root. */ | |
74 | if (does_not_exist != NULL && (errno == ENOENT || errno == EACCES)) | |
73f41491 ILT |
75 | *does_not_exist = 1; |
76 | else | |
77 | error_callback (data, filename, errno); | |
eff02e4f ILT |
78 | return -1; |
79 | } | |
80 | ||
3319ef17 | 81 | #ifdef HAVE_FCNTL |
eff02e4f ILT |
82 | /* Set FD_CLOEXEC just in case the kernel does not support |
83 | O_CLOEXEC. It doesn't matter if this fails for some reason. | |
84 | FIXME: At some point it should be safe to only do this if | |
85 | O_CLOEXEC == 0. */ | |
86 | fcntl (descriptor, F_SETFD, FD_CLOEXEC); | |
3319ef17 | 87 | #endif |
eff02e4f ILT |
88 | |
89 | return descriptor; | |
90 | } | |
91 | ||
92 | /* Close DESCRIPTOR. */ | |
93 | ||
94 | int | |
95 | backtrace_close (int descriptor, backtrace_error_callback error_callback, | |
96 | void *data) | |
97 | { | |
98 | if (close (descriptor) < 0) | |
99 | { | |
100 | error_callback (data, "close", errno); | |
101 | return 0; | |
102 | } | |
103 | return 1; | |
104 | } |