1  /* This test needs to use setrlimit to set the stack size, so it can
       2     only run on Unix.  */
       3  /* { dg-do run { target { i?86-*-linux* i?86-*-gnu* x86_64-*-linux* } } } */
       4  /* { dg-require-effective-target cet } */
       5  /* { dg-require-effective-target split_stack } */
       6  /* { dg-options "-fsplit-stack -fcf-protection" } */
       7  
       8  #include <stdlib.h>
       9  #include <sys/types.h>
      10  #include <sys/resource.h>
      11  
      12  /* Use a noinline function to ensure that the buffer is not removed
      13     from the stack.  */
      14  static void use_buffer (char *buf) __attribute__ ((noinline));
      15  static void
      16  use_buffer (char *buf)
      17  {
      18    buf[0] = '\0';
      19  }
      20  
      21  /* Each recursive call uses 10,000 bytes.  We call it 1000 times,
      22     using a total of 10,000,000 bytes.  If -fsplit-stack is not
      23     working, that will overflow our stack limit.  */
      24  
      25  static void
      26  down (int i)
      27  {
      28    char buf[10000];
      29  
      30    if (i > 0)
      31      {
      32        use_buffer (buf);
      33        down (i - 1);
      34      }
      35  }
      36  
      37  int
      38  main (void)
      39  {
      40    struct rlimit r;
      41  
      42    /* We set a stack limit because we are usually invoked via make, and
      43       make sets the stack limit to be as large as possible.  */
      44    r.rlim_cur = 8192 * 1024;
      45    r.rlim_max = 8192 * 1024;
      46    if (setrlimit (RLIMIT_STACK, &r) != 0)
      47      abort ();
      48    down (1000);
      49    return 0;
      50  }