debug/backtracesymsfd.c

   1 /* Write formatted list with names for addresses in backtrace to a file.
   2    Copyright (C) 1998, 2003, 2005 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #include <execinfo.h>
  22 #include <string.h>
  23 #include <sys/uio.h>
  24
  25 #include <stdio-common/_itoa.h>
  26 #include <not-cancel.h>
  27
  28 #if __ELF_NATIVE_CLASS == 32
  29 # define WORD_WIDTH 8
  30 #else
  31 /* We assume 64bits.  */
  32 # define WORD_WIDTH 16
  33 #endif
  34
  35
  36 void
  37 __backtrace_symbols_fd (array, size, fd)
  38      void *const *array;
  39      int size;
  40      int fd;
  41 {
  42   struct iovec iov[3];
  43   int cnt;
  44
  45   for (cnt = 0; cnt < size; ++cnt)
  46     {
  47       char buf[WORD_WIDTH];
  48
  49       iov[0].iov_base = (void *) "[0x";
  50       iov[0].iov_len = 3;
  51
  52       iov[1].iov_base = _itoa_word ((unsigned long int) array[cnt],
  53                                     &buf[WORD_WIDTH], 16, 0);
  54       iov[1].iov_len = &buf[WORD_WIDTH] - (char *) iov[1].iov_base;
  55
  56       iov[2].iov_base = (void *) "]\n";
  57       iov[2].iov_len = 2;
  58
  59       /* We prefer to use the non-cancelable interface if it is available.  */
  60       writev_not_cancel_no_status (fd, iov, 3);
  61     }
  62 }
  63 weak_alias (__backtrace_symbols_fd, backtrace_symbols_fd)
  64 libc_hidden_def (__backtrace_symbols_fd)