libustinstr-malloc/mallocwrap.c

   1 /*
   2  * Copyright (C) 2009  Pierre-Marc Fournier
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
  17  */
  18
  19 #define _GNU_SOURCE
  20 #include <dlfcn.h>
  21 #include <sys/types.h>
  22 #include <stdio.h>
  23 #include <ust/marker.h>
  24
  25 void *malloc(size_t size)
  26 {
  27         static void *(*plibc_malloc)(size_t size) = NULL;
  28         void *retval;
  29
  30         if (plibc_malloc == NULL) {
  31                 plibc_malloc = dlsym(RTLD_NEXT, "malloc");
  32                 if (plibc_malloc == NULL) {
  33                         fprintf(stderr, "mallocwrap: unable to find malloc\n");
  34                         return NULL;
  35                 }
  36         }
  37
  38         retval = plibc_malloc(size);
  39
  40         ust_marker(malloc, "size %d ptr %p", (int)size, retval);
  41
  42         return retval;
  43 }
  44
  45 void free(void *ptr)
  46 {
  47         static void *(*plibc_free)(void *ptr) = NULL;
  48
  49         if (plibc_free == NULL) {
  50                 plibc_free = dlsym(RTLD_NEXT, "free");
  51                 if (plibc_free == NULL) {
  52                         fprintf(stderr, "mallocwrap: unable to find free\n");
  53                         return;
  54                 }
  55         }
  56
  57         ust_marker(free, "ptr %p", ptr);
  58
  59         plibc_free(ptr);
  60 }
  61
  62 UST_MARKER_LIB