text: /* Verifies that mapping over the stack segment is disallowed. */
  
  #include <stdint.h>
  #include <round.h>
  #include <syscall.h>
  #include "tests/lib.h"
  #include "tests/main.h"
  
  void
  test_main (void)
  {
    int handle;
    uintptr_t handle_page = ROUND_DOWN ((uintptr_t) &handle, 4096);
  
    CHECK ((handle = open ("sample.txt")) > 1, "open \"sample.txt\"");
    CHECK (mmap (handle, (void*) handle_page) == MAP_FAILED,
           "try to mmap over stack segment");
  }
  
  