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30891f35fa
We stopped adding "Contributed by" or similar lines in sources in 2012 in favour of git logs and keeping the Contributors section of the glibc manual up to date. Removing these lines makes the license header a bit more consistent across files and also removes the possibility of error in attribution when license blocks or files are copied across since the contributed-by lines don't actually reflect reality in those cases. Move all "Contributed by" and similar lines (Written by, Test by, etc.) into a new file CONTRIBUTED-BY to retain record of these contributions. These contributors are also mentioned in manual/contrib.texi, so we just maintain this additional record as a courtesy to the earlier developers. The following scripts were used to filter a list of files to edit in place and to clean up the CONTRIBUTED-BY file respectively. These were not added to the glibc sources because they're not expected to be of any use in future given that this is a one time task: https://gist.github.com/siddhesh/b5ecac94eabfd72ed2916d6d8157e7dc https://gist.github.com/siddhesh/15ea1f5e435ace9774f485030695ee02 Reviewed-by: Carlos O'Donell <carlos@redhat.com>
120 lines
3.4 KiB
C
120 lines
3.4 KiB
C
/* Return list with names for address in backtrace.
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Copyright (C) 1998-2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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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<https://www.gnu.org/licenses/>. */
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#include <assert.h>
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#include <execinfo.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.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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char **
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__backtrace_symbols (void *const *array, int size)
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{
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Dl_info info[size];
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int status[size];
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int cnt;
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size_t total = 0;
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char **result;
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/* Fill in the information we can get from `dladdr'. */
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for (cnt = 0; cnt < size; ++cnt)
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{
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struct link_map *map;
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status[cnt] = _dl_addr (array[cnt], &info[cnt], &map, NULL);
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if (status[cnt] && info[cnt].dli_fname && info[cnt].dli_fname[0] != '\0')
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{
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/* We have some info, compute the length of the string which will be
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"<file-name>(<sym-name>+offset) [address]. */
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total += (strlen (info[cnt].dli_fname ?: "")
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+ strlen (info[cnt].dli_sname ?: "")
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+ 3 + WORD_WIDTH + 3 + WORD_WIDTH + 5);
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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[cnt].dli_fbase = (void *) map->l_addr;
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}
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else
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total += 5 + WORD_WIDTH;
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}
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/* Allocate memory for the result. */
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result = (char **) malloc (size * sizeof (char *) + total);
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if (result != NULL)
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{
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char *last = (char *) (result + size);
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for (cnt = 0; cnt < size; ++cnt)
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{
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result[cnt] = last;
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if (status[cnt]
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&& info[cnt].dli_fname != NULL && info[cnt].dli_fname[0] != '\0')
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{
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if (info[cnt].dli_sname == NULL)
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/* We found no symbol name to use, so describe it as
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relative to the file. */
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info[cnt].dli_saddr = info[cnt].dli_fbase;
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if (info[cnt].dli_sname == NULL && info[cnt].dli_saddr == 0)
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last += 1 + sprintf (last, "%s(%s) [%p]",
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info[cnt].dli_fname ?: "",
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info[cnt].dli_sname ?: "",
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array[cnt]);
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else
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{
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char sign;
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ptrdiff_t offset;
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if (array[cnt] >= (void *) info[cnt].dli_saddr)
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{
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sign = '+';
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offset = array[cnt] - info[cnt].dli_saddr;
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}
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else
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{
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sign = '-';
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offset = info[cnt].dli_saddr - array[cnt];
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}
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last += 1 + sprintf (last, "%s(%s%c%#tx) [%p]",
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info[cnt].dli_fname ?: "",
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info[cnt].dli_sname ?: "",
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sign, offset, array[cnt]);
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}
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}
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else
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last += 1 + sprintf (last, "[%p]", array[cnt]);
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}
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assert (last <= (char *) result + size * sizeof (char *) + total);
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}
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return result;
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}
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weak_alias (__backtrace_symbols, backtrace_symbols)
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