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123 lines
3.4 KiB
C
123 lines
3.4 KiB
C
/* Write formatted list with names for addresses in backtrace to a file.
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Copyright (C) 1998-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <execinfo.h>
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#include <string.h>
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#include <sys/uio.h>
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#include <_itoa.h>
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#include <ldsodefs.h>
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#if __ELF_NATIVE_CLASS == 32
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# define WORD_WIDTH 8
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#else
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/* We assume 64bits. */
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# define WORD_WIDTH 16
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#endif
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void
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__backtrace_symbols_fd (void *const *array, int size, int fd)
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{
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struct iovec iov[9];
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int cnt;
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for (cnt = 0; cnt < size; ++cnt)
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{
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char buf[WORD_WIDTH];
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char buf2[WORD_WIDTH];
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Dl_info info;
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struct link_map *map;
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size_t last = 0;
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if (_dl_addr (array[cnt], &info, &map, NULL)
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&& info.dli_fname != NULL && info.dli_fname[0] != '\0')
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{
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/* Name of the file. */
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iov[0].iov_base = (void *) info.dli_fname;
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iov[0].iov_len = strlen (info.dli_fname);
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last = 1;
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if (info.dli_sname != NULL || map->l_addr != 0)
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{
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size_t diff;
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iov[last].iov_base = (void *) "(";
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iov[last].iov_len = 1;
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++last;
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if (info.dli_sname != NULL)
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{
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/* We have a symbol name. */
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iov[last].iov_base = (void *) info.dli_sname;
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iov[last].iov_len = strlen (info.dli_sname);
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++last;
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}
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else
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/* We have no symbol, so describe it as relative to the file.
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The load bias is more useful to the user than the load
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address. The use of these addresses is to calculate an
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address in the ELF file, so its prelinked bias is not
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something we want to subtract out. */
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info.dli_saddr = (void *) map->l_addr;
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if (array[cnt] >= (void *) info.dli_saddr)
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{
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iov[last].iov_base = (void *) "+0x";
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diff = array[cnt] - info.dli_saddr;
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}
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else
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{
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iov[last].iov_base = (void *) "-0x";
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diff = info.dli_saddr - array[cnt];
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}
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iov[last].iov_len = 3;
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++last;
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iov[last].iov_base = _itoa_word ((unsigned long int) diff,
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&buf2[WORD_WIDTH], 16, 0);
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iov[last].iov_len = (&buf2[WORD_WIDTH]
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- (char *) iov[last].iov_base);
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++last;
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iov[last].iov_base = (void *) ")";
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iov[last].iov_len = 1;
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++last;
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}
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}
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iov[last].iov_base = (void *) "[0x";
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iov[last].iov_len = 3;
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++last;
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iov[last].iov_base = _itoa_word ((unsigned long int) array[cnt],
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&buf[WORD_WIDTH], 16, 0);
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iov[last].iov_len = &buf[WORD_WIDTH] - (char *) iov[last].iov_base;
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++last;
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iov[last].iov_base = (void *) "]\n";
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iov[last].iov_len = 2;
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++last;
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__writev (fd, iov, last);
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}
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}
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weak_alias (__backtrace_symbols_fd, backtrace_symbols_fd)
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libc_hidden_def (__backtrace_symbols_fd)
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