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ece5f8015f
We've been seeing crashes in libbfd when we attempt to generate a stack trace from multiple threads. It turns out that libbfd is NOT thread-safe. It can cache the bfd structure and give it to multiple threads without protecting itself. To get around this, we've added a global mutex around the bfd functions and also have refactored the use of those functions to be more efficient and to provide more information about inlined functions. Also added a few more tests to test_pbx.c. One just calls ast_assert() and the other calls ast_log_backtrace(). Neither are run by default. WARNING: This change necessitated changing the return value of ast_bt_get_symbols() from an array of strings to a VECTOR of strings. However, the use of this function outside Asterisk is not likely. ASTERISK-28140 Change-Id: I79d02862ddaa2423a0809caa4b3b85c128131621
113 lines
3.1 KiB
C
113 lines
3.1 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 1999 - 2013, Digium, Inc.
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*
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* Matt Jordan <mjordan@digium.com>
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*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License Version 2. See the LICENSE file
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* at the top of the source tree.
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*/
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/*! \file
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* \brief Asterisk backtrace generation
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*
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* This file provides backtrace generation utilities
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*/
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#ifndef BACKTRACE_H_
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#define BACKTRACE_H_
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#define AST_MAX_BT_FRAMES 32
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#ifdef HAVE_BKTR
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#define ast_bt_get_addresses(bt) __ast_bt_get_addresses((bt))
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#define ast_bt_create() __ast_bt_create()
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#define ast_bt_destroy(bt) __ast_bt_destroy((bt))
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#define ast_bt_get_symbols(addresses, num_frames) __ast_bt_get_symbols((addresses), (num_frames))
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#define ast_bt_free_symbols(string_vector) __ast_bt_free_symbols((string_vector))
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#else
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#define ast_bt_get_addresses(bt) 0
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#define ast_bt_create() NULL
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#define ast_bt_destroy(bt) NULL
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#define ast_bt_get_symbols(addresses, num_frames) NULL
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#define ast_bt_free_symbols(string_vector) NULL
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#endif
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/* \brief
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*
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* A structure to hold backtrace information. This structure provides an easy means to
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* store backtrace information or pass backtraces to other functions.
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*/
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struct ast_bt {
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/*! The addresses of the stack frames. This is filled in by calling the glibc backtrace() function */
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void *addresses[AST_MAX_BT_FRAMES];
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/*! The number of stack frames in the backtrace */
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int num_frames;
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/*! Tells if the ast_bt structure was dynamically allocated */
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unsigned int alloced:1;
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};
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#ifdef HAVE_BKTR
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/* \brief
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* Allocates memory for an ast_bt and stores addresses and symbols.
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*
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* \return Returns NULL on failure, or the allocated ast_bt on success
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* \since 1.6.1
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*/
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struct ast_bt *__ast_bt_create(void);
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/* \brief
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* Fill an allocated ast_bt with addresses
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*
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* \retval 0 Success
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* \retval -1 Failure
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* \since 1.6.1
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*/
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int __ast_bt_get_addresses(struct ast_bt *bt);
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/* \brief
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*
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* Free dynamically allocated portions of an ast_bt
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*
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* \retval NULL.
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* \since 1.6.1
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*/
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void *__ast_bt_destroy(struct ast_bt *bt);
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/* \brief Retrieve symbols for a set of backtrace addresses
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*
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* \param addresses A list of addresses, such as the ->addresses structure element of struct ast_bt.
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* \param num_frames Number of addresses in the addresses list
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*
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* \retval NULL Unable to allocate memory
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* \return Vector of strings. Free with ast_bt_free_symbols
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*
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* \note The first frame in the addresses array will usually point to __ast_bt_create
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* so when printing the symbols you may wish to start at position 1 rather than 0.
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*
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* \since 1.6.2.16
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*/
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struct ast_vector_string *__ast_bt_get_symbols(void **addresses, size_t num_frames);
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/* \brief Free symbols returned from ast_bt_get_symbols
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*
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* \param symbols The symbol string vector
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*
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* \since 13.24.0
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*/
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void __ast_bt_free_symbols(struct ast_vector_string *symbols);
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#endif /* HAVE_BKTR */
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#endif /* BACKTRACE_H_ */
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