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- /* 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; see the file COPYING.LIB. If
- not, see <http://www.gnu.org/licenses/>.
- 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);
- }
- }
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