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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; 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);
}
}
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