malloc/mtrace.c

   1 /* mtrace API for `malloc'.
   2    Copyright (C) 1991-2024 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #if !IS_IN (libc)
  20 # include "mtrace-impl.c"
  21 #else
  22 # include <shlib-compat.h>
  23 # include <libc-symbols.h>
  24 #endif
  25
  26 #if IS_IN (libc) && SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_34)
  27 /* Compatibility symbols that were introduced to help break at allocation sites
  28    for specific memory allocations.  This is unusable with ASLR, although gdb
  29    may allow predictable allocation addresses.  Even then, gdb has watchpoint
  30    and conditional breakpoint support which should provide the same
  31    functionality without having this kludge.  These symbols are preserved in
  32    case some applications ended up linking against them but they don't actually
  33    do anything anymore; not that they did much before anyway.  */
  34
  35 void *mallwatch;
  36 compat_symbol (libc, mallwatch, mallwatch, GLIBC_2_0);
  37
  38 void
  39 tr_break (void)
  40 {
  41 }
  42 compat_symbol (libc, tr_break, tr_break, GLIBC_2_0);
  43 #endif
  44
  45
  46 void
  47 mtrace (void)
  48 {
  49 #if !IS_IN (libc)
  50   do_mtrace ();
  51 #endif
  52 }
  53
  54 void
  55 muntrace (void)
  56 {
  57 #if !IS_IN (libc)
  58   do_muntrace ();
  59 #endif
  60 }