How to get fullstacktrace using _Unwind_Backtrace on SIGSEGV

I handle SIGSEGV by code:

int C(){  int *i = NULL;  *i = 10; // Crash there}int B(){  return C();}int A(){   return B();}int main(void){  struct sigaction handler;  memset(&handler,0,sizeof(handler));  handler.sa_sigaction = handler_func;  handler.sa_flags = SA_SIGINFO;  sigaction(SIGSEGV,&handler,NULL);  return(C());}

Where handler code are:

static int handler_func(int signal, siginfo_t info, void* rserved){  const void* stack[MAX_DEPTH];  StackCrowlState state;  state.addr = stack;  state.count = MAX_DEPTH;  _Unwind_Reason_Code code = _Unwind_Backtrace(trace_func,&state);  printf("Stack trace count: %d, code: %d\n",MAX_DEPTH - state.count, code);  kill(getpid(),SIGKILL);}static _Unwind_Reason_Code trace_func(void* context, void* arg){  StackCrowlState *state = (StackCrowlState *)arg;  if(state->count>0)  {     void *ip = (void *)_Unwind_GetIP(context);     if(ip)     {       state->addr[0] = ip;       state->count--;       state->addr++;     }  }  return(_URC_NO_REASON);}

But trace_func where called only once, and shows only on _Unwind_Backtrace calls. Is it possible to get stacktrace of code which cause SIGSEGV signal using _Unwind_Backtrace?