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/* * Copyright (C) Internet Systems Consortium, Inc. ("ISC") * * This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. * * See the COPYRIGHT file distributed with this work for additional * information regarding copyright ownership. */ /*! \file isc/backtrace.h * \brief provide a back trace of the running process to help debug problems. * * This module tries to get a back trace of the process using some platform * dependent way when available. It also manages an internal symbol table * that maps function addresses used in the process to their textual symbols. * This module is expected to be used to help debug when some fatal error * happens. * * IMPORTANT NOTE: since the (major) intended use case of this module is * dumping a back trace on a fatal error, normally followed by self termination, * functions defined in this module generally doesn't employ assertion checks * (if it did, a program bug could cause infinite recursive calls to a * backtrace function). These functions still perform minimal checks and return * ISC_R_FAILURE if they detect an error, but the caller should therefore be * very careful about the use of these functions, and generally discouraged to * use them except in an exit path. The exception is * isc_backtrace_getsymbolfromindex(), which is expected to be used in a * non-error-handling context and validates arguments with assertion checks. */ #ifndef ISC_BACKTRACE_H #define ISC_BACKTRACE_H 1 /*** *** Imports ***/ #include <isc/types.h> /*** *** Types ***/ struct isc_backtrace_symmap { void *addr; const char *symbol; }; LIBISC_EXTERNAL_DATA extern const int isc__backtrace_nsymbols; LIBISC_EXTERNAL_DATA extern const isc_backtrace_symmap_t isc__backtrace_symtable[]; /*** *** Functions ***/ ISC_LANG_BEGINDECLS isc_result_t isc_backtrace_gettrace(void **addrs, int maxaddrs, int *nframes); /*%< * Get a back trace of the running process above this function itself. On * success, addrs[i] will store the address of the call point of the i-th * stack frame (addrs[0] is the caller of this function). *nframes will store * the total number of frames. * * Requires (note that these are not ensured by assertion checks, see above): * *\li 'addrs' is a valid array containing at least 'maxaddrs' void * entries. * *\li 'nframes' must be non NULL. * * Returns: * *\li #ISC_R_SUCCESS *\li #ISC_R_FAILURE *\li #ISC_R_NOTFOUND *\li #ISC_R_NOTIMPLEMENTED */ isc_result_t isc_backtrace_getsymbolfromindex(int index, const void **addrp, const char **symbolp); /*%< * Returns the content of the internal symbol table of the given index. * On success, *addrsp and *symbolp point to the address and the symbol of * the 'index'th entry of the table, respectively. If 'index' is not in the * range of the symbol table, ISC_R_RANGE will be returned. * * Requires * *\li 'addrp' must be non NULL && '*addrp' == NULL. * *\li 'symbolp' must be non NULL && '*symbolp' == NULL. * * Returns: * *\li #ISC_R_SUCCESS *\li #ISC_R_RANGE */ isc_result_t isc_backtrace_getsymbol(const void *addr, const char **symbolp, unsigned long *offsetp); /*%< * Searches the internal symbol table for the symbol that most matches the * given 'addr'. On success, '*symbolp' will point to the name of function * to which the address 'addr' belong, and '*offsetp' will store the offset * from the function's entry address to 'addr'. * * Requires (note that these are not ensured by assertion checks, see above): * *\li 'symbolp' must be non NULL && '*symbolp' == NULL. * *\li 'offsetp' must be non NULL. * * Returns: * *\li #ISC_R_SUCCESS *\li #ISC_R_FAILURE *\li #ISC_R_NOTFOUND */ ISC_LANG_ENDDECLS #endif /* ISC_BACKTRACE_H */