malloc/mtrace.c

   1 /* mtrace API for `malloc'.
   2    Copyright (C) 1991-2021 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4                  Written April 2, 1991 by John Gilmore of Cygnus Support.
   5                  Based on mcheck.c by Mike Haertel.
   6
   7    The GNU C Library is free software; you can redistribute it and/or
   8    modify it under the terms of the GNU Lesser General Public
   9    License as published by the Free Software Foundation; either
  10    version 2.1 of the License, or (at your option) any later version.
  11
  12    The GNU C Library is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    Lesser General Public License for more details.
  16
  17    You should have received a copy of the GNU Lesser General Public
  18    License along with the GNU C Library; if not, see
  19    <https://www.gnu.org/licenses/>.  */
  20
  21 #if !IS_IN (libc)
  22 # include "mtrace-impl.c"
  23 #else
  24 # include <shlib-compat.h>
  25 # include <libc-symbols.h>
  26 #endif
  27
  28 #if IS_IN (libc) && SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_34)
  29 /* Compatibility symbols that were introduced to help break at allocation sites
  30    for specific memory allocations.  This is unusable with ASLR, although gdb
  31    may allow predictable allocation addresses.  Even then, gdb has watchpoint
  32    and conditional breakpoint support which should provide the same
  33    functionality without having this kludge.  These symbols are preserved in
  34    case some applications ended up linking against them but they don't actually
  35    do anything anymore; not that they did much before anyway.  */
  36
  37 void *mallwatch;
  38 compat_symbol (libc, mallwatch, mallwatch, GLIBC_2_0);
  39
  40 void
  41 tr_break (void)
  42 {
  43 }
  44 compat_symbol (libc, tr_break, tr_break, GLIBC_2_0);
  45 #endif
  46
  47
  48 void
  49 mtrace (void)
  50 {
  51 #if !IS_IN (libc)
  52   do_mtrace ();
  53 #endif
  54 }
  55
  56 void
  57 muntrace (void)
  58 {
  59 #if !IS_IN (libc)
  60   do_muntrace ();
  61 #endif
  62 }