/* Write formatted list with names for addresses in backtrace to a file. Copyright (C) 1998, 2000, 2003, 2005 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. Based on glibc/sysdeps/generic/elf/backtracesymsfd.c Copyright (C) 2010 STMicroelectronics Ltd Author(s): Carmelo Amoroso <carmelo.amoroso@st.com> * Modified to work with uClibc - updated headers inclusion - updated formatting and style - updated to use dladdr from libdl - updated to use snprintf instead of _itoa_word */ #include <execinfo.h> #include <string.h> #include <sys/uio.h> #include <dlfcn.h> #include <stdio.h> #include <link.h> /* required for __ELF_NATIVE_CLASS */ #if __ELF_NATIVE_CLASS == 32 # define WORD_WIDTH 8 #else /* We assyme 64bits. */ # define WORD_WIDTH 16 #endif #define BUF_SIZE (WORD_WIDTH + 1) void backtrace_symbols_fd (void *const *array, int size, int fd) { struct iovec iov[9]; int cnt; for (cnt = 0; cnt < size; ++cnt) { char buf[BUF_SIZE]; Dl_info info; size_t last = 0; size_t len = 0; memset(buf, 0, sizeof(buf)); if (dladdr (array[cnt], &info) && info.dli_fname && info.dli_fname[0] != '\0') { /* Name of the file. */ iov[0].iov_base = (void *) info.dli_fname; iov[0].iov_len = strlen (info.dli_fname); last = 1; /* Symbol name. */ if (info.dli_sname != NULL) { char buf2[BUF_SIZE]; memset(buf2, 0, sizeof(buf2)); size_t diff; iov[1].iov_base = (void *) "("; iov[1].iov_len = 1; iov[2].iov_base = (void *) info.dli_sname; iov[2].iov_len = strlen (info.dli_sname); if (array[cnt] >= (void *) info.dli_saddr) { iov[3].iov_base = (void *) "+0x"; diff = array[cnt] - info.dli_saddr; } else { iov[3].iov_base = (void *) "-0x"; diff = info.dli_saddr - array[cnt]; } iov[3].iov_len = 3; /* convert diff to a string in hex format */ len = snprintf(buf2, sizeof(buf2), "%lx", (unsigned long) diff); iov[4].iov_base = buf2; iov[4].iov_len = len; iov[5].iov_base = (void *) ")"; iov[5].iov_len = 1; last = 6; } } iov[last].iov_base = (void *) "[0x"; iov[last].iov_len = 3; ++last; /* convert array[cnt] to a string in hex format */ len = snprintf(buf, sizeof(buf), "%lx", (unsigned long) array[cnt]); iov[last].iov_base = buf; iov[last].iov_len = len; ++last; iov[last].iov_base = (void *) "]\n"; iov[last].iov_len = 2; ++last; writev (fd, iov, last); } }