libmallocwrap/mallocwrap.c

   1 /* Copyright (C) 2009  Pierre-Marc Fournier
   2  *
   3  * This library is free software; you can redistribute it and/or
   4  * modify it under the terms of the GNU Lesser General Public
   5  * License as published by the Free Software Foundation; either
   6  * version 2.1 of the License, or (at your option) any later version.
   7  *
   8  * This library is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * Lesser General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU Lesser General Public
  14  * License along with this library; if not, write to the Free Software
  15  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
  16  */
  17
  18 #define _GNU_SOURCE
  19 #include <dlfcn.h>
  20 #include <sys/types.h>
  21 #include <stdio.h>
  22
  23 #include "marker.h"
  24
  25 #if 0
  26 INTERCEPT_PROTOTYPE(void, malloc, size_t size)
  27 INTERCEPT_TRACE("size %d", size)
  28 INTERCEPT_CALL_ARGS(size)
  29 INTERCEPT()
  30
  31 #define INTERCEPT_FUNC(type, name, args...)                                             \
  32 __I_FUNC_TYPE(type)                                                                     \
  33 __I_FUNC_NAME(name)                                                                     \
  34 __I_FUNC_ARGS(args)
  35
  36 #define INTERCEPT_TRACE(fmt, args...)                                                   \
  37 #define __I_TRACE_FMT fmt                                                               \
  38 #define __I_TRACE_ARGS args
  39
  40 #define INTERCEPT_CALL_ARGS(args...)                                                    \
  41 #define __I_CALL_ARGS args
  42
  43 #define INTERCEPT()                                                                     \
  44 __I_FUNC_TYPE __I_FUNC_NAME(__I_FUNC_ARGS)                                              \
  45 {                                                                                       \
  46         static __I_FUNC_TYPE (*plibc_ ## __I_FUNC_NAME)(args) = NULL;                   \
  47                                                                                         \
  48         if(plibc_ ## __I_FUNC_NAME == NULL) {                                           \
  49                 plibc_ ## __I_FUNC_NAME = dlsym(RTLD_NEXT, "malloc");                   \
  50                 if(plibc_ ## __I_FUNC_NAME == NULL) {                                   \
  51                         fprintf(stderr, "mallocwrap: unable to find malloc\n");         \
  52                         return NULL;                                                    \
  53                 }                                                                       \
  54         }                                                                               \
  55                                                                                         \
  56         trace_mark(ust, __I_FUNC_NAME, __I_TRACE_FMT, __I_TRACE_ARGS);                  \
  57                                                                                         \
  58         return plibc_ ## __I_FUNC_NAME (__I_CALL_ARGS);                                 \
  59 }
  60 #endif
  61
  62 void *malloc(size_t size)
  63 {
  64         static void *(*plibc_malloc)(size_t size) = NULL;
  65
  66         void *retval;
  67
  68         if(plibc_malloc == NULL) {
  69                 plibc_malloc = dlsym(RTLD_NEXT, "malloc");
  70                 if(plibc_malloc == NULL) {
  71                         fprintf(stderr, "mallocwrap: unable to find malloc\n");
  72                         return NULL;
  73                 }
  74         }
  75
  76         retval = plibc_malloc(size);
  77
  78         trace_mark(ust, malloc, "size %d ptr %p", (int)size, retval);
  79
  80         return retval;
  81 }
  82
  83 void free(void *ptr)
  84 {
  85         static void *(*plibc_free)(void *ptr) = NULL;
  86
  87         if(plibc_free == NULL) {
  88                 plibc_free = dlsym(RTLD_NEXT, "free");
  89                 if(plibc_free == NULL) {
  90                         fprintf(stderr, "mallocwrap: unable to find free\n");
  91                         return NULL;
  92                 }
  93         }
  94
  95         trace_mark(ust, free, "%p", ptr);
  96
  97         return plibc_free(ptr);
  98 }
  99
 100 MARKER_LIB