1/* Catastrophic failure reports. Linux version.
2 Copyright (C) 1993-2019 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
27static bool
28writev_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
40static void
41backtrace_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