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d9b1886f92
handle_segfault is the signal handler code of mysqld. however, it makes calls to potentially unsafe functions localtime_r, fprintf, fflush.
127 lines
4.2 KiB
C
127 lines
4.2 KiB
C
/* Copyright (c) 2001, 2011, 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 as published by
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the Free Software Foundation; version 2 of the License.
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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 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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#ifndef _my_stacktrace_h_
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#define _my_stacktrace_h_
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#include <my_global.h>
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#ifdef TARGET_OS_LINUX
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#if defined (__x86_64__) || defined (__i386__) || \
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(defined(__alpha__) && defined(__GNUC__))
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#define HAVE_STACKTRACE 1
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#endif
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#elif defined(__WIN__) || defined(HAVE_PRINTSTACK)
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#define HAVE_STACKTRACE 1
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#endif
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#if HAVE_BACKTRACE && (HAVE_BACKTRACE_SYMBOLS || HAVE_BACKTRACE_SYMBOLS_FD)
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#undef HAVE_STACKTRACE
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#define HAVE_STACKTRACE 1
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#endif
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#define HAVE_WRITE_CORE
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#if HAVE_BACKTRACE && HAVE_BACKTRACE_SYMBOLS && \
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HAVE_CXXABI_H && HAVE_ABI_CXA_DEMANGLE && \
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HAVE_WEAK_SYMBOL
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#define BACKTRACE_DEMANGLE 1
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#endif
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C_MODE_START
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#if defined(HAVE_STACKTRACE) || defined(HAVE_BACKTRACE)
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void my_init_stacktrace();
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void my_print_stacktrace(uchar* stack_bottom, ulong thread_stack);
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void my_safe_print_str(const char* val, int max_len);
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void my_write_core(int sig);
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#if BACKTRACE_DEMANGLE
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char *my_demangle(const char *mangled_name, int *status);
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#endif
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#ifdef __WIN__
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void my_set_exception_pointers(EXCEPTION_POINTERS *ep);
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#endif
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#endif
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#ifdef HAVE_WRITE_CORE
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void my_write_core(int sig);
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#endif
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/**
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Async-signal-safe utility functions used by signal handler routines.
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Declared here in order to unit-test them.
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These are not general-purpose, but tailored to the signal handling routines.
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*/
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/**
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Converts a longlong value to string.
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@param base 10 for decimal, 16 for hex values (0..9a..f)
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@param val The value to convert
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@param buf Assumed to point to the *end* of the buffer.
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@returns Pointer to the first character of the converted string.
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Negative values:
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for base-10 the return string will be prepended with '-'
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for base-16 the return string will contain 16 characters
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Implemented with simplicity, and async-signal-safety in mind.
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*/
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char *my_safe_itoa(int base, longlong val, char *buf);
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/**
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Converts a ulonglong value to string.
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@param base 10 for decimal, 16 for hex values (0..9a..f)
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@param val The value to convert
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@param buf Assumed to point to the *end* of the buffer.
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@returns Pointer to the first character of the converted string.
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Implemented with simplicity, and async-signal-safety in mind.
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*/
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char *my_safe_utoa(int base, ulonglong val, char *buf);
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/**
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A (very) limited version of snprintf.
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@param to Destination buffer.
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@param n Size of destination buffer.
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@param fmt printf() style format string.
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@returns Number of bytes written, including terminating '\0'
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Supports 'd' 'i' 'u' 'x' 'p' 's' conversion.
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Supports 'l' and 'll' modifiers for integral types.
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Does not support any width/precision.
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Implemented with simplicity, and async-signal-safety in mind.
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*/
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size_t my_safe_snprintf(char* to, size_t n, const char* fmt, ...)
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ATTRIBUTE_FORMAT(printf, 3, 4);
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/**
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A (very) limited version of snprintf, which writes the result to STDERR.
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@sa my_safe_snprintf
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Implemented with simplicity, and async-signal-safety in mind.
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@note Has an internal buffer capacity of 512 bytes,
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which should suffice for our signal handling routines.
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*/
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size_t my_safe_printf_stderr(const char* fmt, ...)
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ATTRIBUTE_FORMAT(printf, 1, 2);
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/**
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Writes up to count bytes from buffer to STDERR.
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Implemented with simplicity, and async-signal-safety in mind.
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@param buf Buffer containing data to be written.
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@param count Number of bytes to write.
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@returns Number of bytes written.
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*/
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size_t my_write_stderr(const void *buf, size_t count);
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C_MODE_END
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#endif /* _my_stacktrace_h_ */
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