#define STORESIZE sizeof(size_t)
int n = backtrace(buffer, 1024);
char **symbols = backtrace_symbols(buffer, n);
for (i = 0; i < n; i++) {
printf("%s\n", symbols[i]);
void signal_handler(int sig) {
printf("signal with %d\n",sig);
void my_free(void* addr){
printf("free addr:%p size:%d append_size:%d\n",addr,*(size_t*)((size_t)addr-STORESIZE),STORESIZE);
memset(addr,0xFF,*(size_t*)((size_t)addr-STORESIZE));
free((void*)((size_t)addr-STORESIZE));
void* my_malloc(size_t len){
void* addr=malloc(len+STORESIZE);
printf("malloc addr:%p size:%d app_size:%d\n",(void*)((size_t)addr+STORESIZE),len,STORESIZE);
return (void*)((size_t)addr+STORESIZE);
signal(SIGSEGV, signal_handler);