1 | /* Catastrophic failure reports. Linux version. |
2 | Copyright (C) 1993-2018 Free Software Foundation, Inc. |
3 | This file is part of the GNU C Library. |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either |
8 | version 2.1 of the License, or (at your option) any later version. |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | Lesser General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. */ |
18 | |
19 | #include <errno.h> |
20 | #include <execinfo.h> |
21 | #include <fcntl.h> |
22 | #include <not-cancel.h> |
23 | #include <string.h> |
24 | #include <sys/mman.h> |
25 | #include <sys/uio.h> |
26 | |
27 | static bool |
28 | writev_for_fatal (int fd, const struct iovec *iov, size_t niov, size_t total) |
29 | { |
30 | INTERNAL_SYSCALL_DECL (err); |
31 | ssize_t cnt; |
32 | do |
33 | cnt = INTERNAL_SYSCALL (writev, err, 3, fd, iov, niov); |
34 | while (INTERNAL_SYSCALL_ERROR_P (cnt, err) |
35 | && INTERNAL_SYSCALL_ERRNO (cnt, err) == EINTR); |
36 | return cnt == total; |
37 | } |
38 | #define WRITEV_FOR_FATAL writev_for_fatal |
39 | |
40 | static void |
41 | backtrace_and_maps (int do_abort, bool written, int fd) |
42 | { |
43 | if (do_abort > 1 && written) |
44 | { |
45 | void *addrs[64]; |
46 | #define naddrs (sizeof (addrs) / sizeof (addrs[0])) |
47 | int n = __backtrace (addrs, naddrs); |
48 | if (n > 2) |
49 | { |
50 | #define strnsize(str) str, strlen (str) |
51 | #define writestr(str) __write_nocancel (fd, str) |
52 | writestr (strnsize ("======= Backtrace: =========\n" )); |
53 | __backtrace_symbols_fd (addrs + 1, n - 1, fd); |
54 | |
55 | writestr (strnsize ("======= Memory map: ========\n" )); |
56 | int fd2 = __open_nocancel ("/proc/self/maps" , O_RDONLY); |
57 | char buf[1024]; |
58 | ssize_t n2; |
59 | while ((n2 = __read_nocancel (fd2, buf, sizeof (buf))) > 0) |
60 | if (__write_nocancel (fd, buf, n2) != n2) |
61 | break; |
62 | __close_nocancel_nostatus (fd2); |
63 | } |
64 | } |
65 | } |
66 | #define BEFORE_ABORT backtrace_and_maps |
67 | |
68 | #include <sysdeps/posix/libc_fatal.c> |
69 | |