text: /* -*- Mode: C; tab-width: 8; c-basic-offset: 2; indent-tabs-mode: nil; -*- */
  
  #include "rrutil.h"
  
  static char buf[128 * 1024];
  
  int main(void) {
    stack_t* ss;
    stack_t* oss;
  
    ALLOCATE_GUARD(ss, 'x');
    ss->ss_sp = buf;
    ss->ss_flags = 0;
    ss->ss_size = sizeof(buf);
    test_assert(0 == sigaltstack(ss, NULL));
    VERIFY_GUARD(ss);
  
    ALLOCATE_GUARD(oss, 'y');
    test_assert(0 == sigaltstack(ss, oss));
    test_assert(oss->ss_sp == buf);
    test_assert(oss->ss_flags == 0);
    test_assert(oss->ss_size == sizeof(buf));
    VERIFY_GUARD(ss);
    VERIFY_GUARD(oss);
  
    atomic_puts("EXIT-SUCCESS");
    return 0;
  }
  