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#define _GNU_SOURCE
#include <dlfcn.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
static char tmpbuff[1024];
static unsigned long tmppos = 0;
static unsigned long tmpallocs = 0;
static FILE* out = NULL;
static int in_fprintf = 0;
/*=========================================================
* * interception points
* */
static void * (*myfn_malloc)(size_t size);
static void (*myfn_free)(void* ptr);
static void * (*myfn_calloc)(size_t nmemb, size_t size);
static void * (*myfn_realloc)(void* ptr, size_t size);
static void init()
{
out = fopen("chattymalloc.data", "w");
if (out == NULL)
{
fprintf(stderr, "failed to open output file\n");
exit(1);
}
myfn_malloc = dlsym(RTLD_NEXT, "malloc");
myfn_free = dlsym(RTLD_NEXT, "free");
myfn_calloc = dlsym(RTLD_NEXT, "calloc");
myfn_realloc = dlsym(RTLD_NEXT, "realloc");
if (!myfn_malloc || !myfn_free || !myfn_calloc || !myfn_realloc)
{
fprintf(stderr, "Error in `dlsym`: %s\n", dlerror());
exit(1);
}
}
void *malloc(size_t size)
{
static int initializing = 0;
if (myfn_malloc == NULL)
{
if (!initializing)
{
initializing = 1;
init();
initializing = 0;
}
else
{
if (tmppos + size < sizeof(tmpbuff))
{
void *retptr = tmpbuff + tmppos;
tmppos += size;
++tmpallocs;
return retptr;
}
else
{
fprintf(stderr, "jcheck: too much memory requested during initialisation - increase tmpbuff size\n");
exit(1);
}
}
}
if (!in_fprintf)
{
in_fprintf = 1;
fprintf(out, "%d\n", size);
in_fprintf = 0;
}
void *ptr = myfn_malloc(size);
return ptr;
}
void free(void *ptr)
{
// something wrong if we call free before one of the allocators!
if (myfn_malloc == NULL)
init();
if (!(ptr >= (void*) tmpbuff && ptr <= (void*)(tmpbuff + tmppos)))
myfn_free(ptr);
}
void* realloc(void *ptr, size_t size)
{
if (myfn_realloc == NULL)
{
void *nptr = malloc(size);
if (nptr && ptr)
{
memmove(nptr, ptr, size);
free(ptr);
}
return nptr;
}
if (!in_fprintf)
{
in_fprintf = 1;
fprintf(out, "%d\n", size);
in_fprintf = 0;
}
return myfn_realloc(ptr, size);
}
void* calloc(size_t nmemb, size_t size)
{
if (myfn_calloc == NULL)
{
void *ptr = malloc(nmemb*size);
if (ptr)
memset(ptr, 0, nmemb*size);
return ptr;
}
if (!in_fprintf)
{
in_fprintf = 1;
fprintf(out, "%d\n", size*nmemb);
in_fprintf = 0;
}
return myfn_calloc(nmemb, size);
}
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