libmallocwrap/mallocwrap.c

   1 #define _GNU_SOURCE
   2 #include <dlfcn.h>
   3 #include <sys/types.h>
   4 #include <stdio.h>
   5
   6 #include "marker.h"
   7
   8 #if 0
   9 INTERCEPT_PROTOTYPE(void, malloc, size_t size)
  10 INTERCEPT_TRACE("size %d", size)
  11 INTERCEPT_CALL_ARGS(size)
  12 INTERCEPT()
  13
  14 #define INTERCEPT_FUNC(type, name, args...)                                             \
  15 __I_FUNC_TYPE(type)                                                                     \
  16 __I_FUNC_NAME(name)                                                                     \
  17 __I_FUNC_ARGS(args)
  18
  19 #define INTERCEPT_TRACE(fmt, args...)                                                   \
  20 #define __I_TRACE_FMT fmt                                                               \
  21 #define __I_TRACE_ARGS args
  22
  23 #define INTERCEPT_CALL_ARGS(args...)                                                    \
  24 #define __I_CALL_ARGS args
  25
  26 #define INTERCEPT()                                                                     \
  27 __I_FUNC_TYPE __I_FUNC_NAME(__I_FUNC_ARGS)                                              \
  28 {                                                                                       \
  29         static __I_FUNC_TYPE (*plibc_ ## __I_FUNC_NAME)(args) = NULL;                   \
  30                                                                                         \
  31         if(plibc_ ## __I_FUNC_NAME == NULL) {                                           \
  32                 plibc_ ## __I_FUNC_NAME = dlsym(RTLD_NEXT, "malloc");                   \
  33                 if(plibc_ ## __I_FUNC_NAME == NULL) {                                   \
  34                         fprintf(stderr, "mallocwrap: unable to find malloc\n");         \
  35                         return NULL;                                                    \
  36                 }                                                                       \
  37         }                                                                               \
  38                                                                                         \
  39         trace_mark(ust, __I_FUNC_NAME, __I_TRACE_FMT, __I_TRACE_ARGS);                  \
  40                                                                                         \
  41         return plibc_ ## __I_FUNC_NAME (__I_CALL_ARGS);                                 \
  42 }
  43 #endif
  44
  45 void *malloc(size_t size)
  46 {
  47         static void *(*plibc_malloc)(size_t size) = NULL;
  48
  49         void *retval;
  50
  51         if(plibc_malloc == NULL) {
  52                 plibc_malloc = dlsym(RTLD_NEXT, "malloc");
  53                 if(plibc_malloc == NULL) {
  54                         fprintf(stderr, "mallocwrap: unable to find malloc\n");
  55                         return NULL;
  56                 }
  57         }
  58
  59         retval = plibc_malloc(size);
  60
  61         trace_mark(ust, malloc, "size %d ptr %p", (int)size, retval);
  62
  63         return retval;
  64 }
  65
  66 void free(void *ptr)
  67 {
  68         static void *(*plibc_free)(void *ptr) = NULL;
  69
  70         if(plibc_free == NULL) {
  71                 plibc_free = dlsym(RTLD_NEXT, "free");
  72                 if(plibc_free == NULL) {
  73                         fprintf(stderr, "mallocwrap: unable to find free\n");
  74                         return NULL;
  75                 }
  76         }
  77
  78         trace_mark(ust, free, "%p", ptr);
  79
  80         return plibc_free(ptr);
  81 }
  82
  83 MARKER_LIB