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180 lines
5.6 KiB
180 lines
5.6 KiB
/* Copyright (c) 2011, 2019, Oracle and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License, version 2.0,
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as published by the Free Software Foundation.
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This program is also distributed with certain software (including
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but not limited to OpenSSL) that is licensed under separate terms,
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as designated in a particular file or component or in included license
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documentation. The authors of MySQL hereby grant you an additional
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permission to link the program and your derivative works with the
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separately licensed software that they have included with MySQL.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License, version 2.0, for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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#include "my_config.h"
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#include <signal.h>
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#include <sys/types.h>
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#include <time.h>
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#include <atomic>
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#include "lex_string.h"
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#include "my_inttypes.h"
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include "my_macros.h"
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#include "my_stacktrace.h"
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#include "my_sys.h"
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#include "sql/mysqld.h"
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#include "sql/sql_class.h"
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#include "sql/sql_const.h"
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#ifdef _WIN32
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#include <crtdbg.h>
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#define SIGNAL_FMT "exception 0x%x"
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#else
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#define SIGNAL_FMT "signal %d"
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#endif
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/*
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We are handling signals in this file.
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Any global variables we read should be 'volatile sig_atomic_t'
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to guarantee that we read some consistent value.
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*/
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static volatile sig_atomic_t segfaulted = 0;
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/**
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* Handler for fatal signals
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*
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* Fatal events (seg.fault, bus error etc.) will trigger
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* this signal handler. The handler will try to dump relevant
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* debugging information to stderr and dump a core image.
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*
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* Signal handlers can only use a set of 'safe' system calls
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* and library functions. A list of safe calls in POSIX systems
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* are available at:
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* http://pubs.opengroup.org/onlinepubs/009695399/functions/xsh_chap02_04.html
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* For MS Windows, guidelines are available at:
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* http://msdn.microsoft.com/en-us/library/xdkz3x12(v=vs.71).aspx
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*
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* @param sig Signal number
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*/
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extern "C" void handle_fatal_signal(int sig) {
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if (segfaulted) {
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my_safe_printf_stderr("Fatal " SIGNAL_FMT " while backtracing\n", sig);
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_exit(MYSQLD_FAILURE_EXIT); /* Quit without running destructors */
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}
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segfaulted = 1;
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#ifdef _WIN32
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SYSTEMTIME utc_time;
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GetSystemTime(&utc_time);
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const long hrs = utc_time.wHour;
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const long mins = utc_time.wMinute;
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const long secs = utc_time.wSecond;
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#else
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/* Using time() instead of my_time() to avoid looping */
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const time_t curr_time = time(NULL);
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/* Calculate time of day */
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const long tmins = curr_time / 60;
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const long thrs = tmins / 60;
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const long hrs = thrs % 24;
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const long mins = tmins % 60;
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const long secs = curr_time % 60;
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#endif
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char hrs_buf[3] = "00";
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char mins_buf[3] = "00";
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char secs_buf[3] = "00";
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my_safe_itoa(10, hrs, &hrs_buf[2]);
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my_safe_itoa(10, mins, &mins_buf[2]);
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my_safe_itoa(10, secs, &secs_buf[2]);
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my_safe_printf_stderr("%s:%s:%s UTC - mysqld got " SIGNAL_FMT " ;\n", hrs_buf,
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mins_buf, secs_buf, sig);
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my_safe_printf_stderr(
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"%s",
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"Most likely, you have hit a bug, but this error can also "
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"be caused by malfunctioning hardware.\n");
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#ifdef HAVE_STACKTRACE
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THD *thd = current_thd;
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if (!(test_flags & TEST_NO_STACKTRACE)) {
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my_safe_printf_stderr("Thread pointer: 0x%p\n", thd);
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my_safe_printf_stderr(
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"%s",
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"Attempting backtrace. You can use the following "
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"information to find out\n"
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"where mysqld died. If you see no messages after this, something went\n"
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"terribly wrong...\n");
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my_print_stacktrace(
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thd ? pointer_cast<const uchar *>(thd->thread_stack) : nullptr,
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my_thread_stack_size);
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}
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if (thd) {
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const char *kreason = "UNKNOWN";
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switch (thd->killed.load()) {
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case THD::NOT_KILLED:
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kreason = "NOT_KILLED";
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break;
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case THD::KILL_CONNECTION:
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kreason = "KILL_CONNECTION";
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break;
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case THD::KILL_QUERY:
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kreason = "KILL_QUERY";
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break;
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case THD::KILL_TIMEOUT:
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kreason = "KILL_TIMEOUT";
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break;
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case THD::KILLED_NO_VALUE:
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kreason = "KILLED_NO_VALUE";
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break;
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}
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my_safe_printf_stderr(
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"%s",
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"\n"
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"Trying to get some variables.\n"
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"Some pointers may be invalid and cause the dump to abort.\n");
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my_safe_printf_stderr("Query (%p): ", thd->query().str);
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my_safe_puts_stderr(thd->query().str, MY_MIN(1024U, thd->query().length));
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my_safe_printf_stderr("Connection ID (thread ID): %u\n", thd->thread_id());
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my_safe_printf_stderr("Status: %s\n\n", kreason);
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}
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my_safe_printf_stderr(
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"%s",
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"The manual page at "
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"http://dev.mysql.com/doc/mysql/en/crashing.html contains\n"
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"information that should help you find out what is causing the crash.\n");
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#endif /* HAVE_STACKTRACE */
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if (test_flags & TEST_CORE_ON_SIGNAL) {
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my_safe_printf_stderr("%s", "Writing a core file\n");
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my_write_core(sig);
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}
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#ifndef _WIN32
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/*
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Quit, without running destructors (etc.)
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On Windows, do not terminate, but pass control to exception filter.
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*/
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_exit(MYSQLD_FAILURE_EXIT); // Using _exit(), since exit() is not async
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// signal safe
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#endif
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}
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