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/* This testcase is part of GDB, the GNU debugger.

   Copyright 2004, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.

   This program is free software; you can redistribute it and/or modify

   it under the terms of the GNU General Public License as published by

   the Free Software Foundation; either version 3 of the License, or

   (at your option) any later version.

   This program is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License

   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#include <signal.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <sys/time.h>

enum level { MAIN, OUTER, INNER, LEAF, NR_LEVELS };

/* Levels completed flag.  */

volatile enum level level = NR_LEVELS;

void catcher (int signal);

void

thrower (enum level next_level, int sig, int itimer, int on_stack)

{

  level = next_level;

  /* Set up the signal handler.  */

  {

    struct sigaction act;

    memset (&act, 0, sizeof (act));

    act.sa_handler = catcher;

    act.sa_flags |= on_stack;

    sigaction (sig, &act, NULL);

  }

  /* Set up a one-off timer.  A timer, rather than SIGSEGV, is used as

     after a timer handler finishes the interrupted code can safely

     resume.  */

  {

    struct itimerval itime;

    memset (&itime, 0, sizeof (itime));

    itime.it_value.tv_usec = 250 * 1000;

    setitimer (itimer, &itime, NULL);

  }

  /* Wait.  */

  while (level != LEAF);

}

void

catcher (int signal)

{

  /* Find the next level.  */

  switch (level)

    {

    case MAIN:

      thrower (OUTER, SIGALRM, ITIMER_REAL, SA_ONSTACK);

      break;

    case OUTER:

      thrower (INNER, SIGVTALRM, ITIMER_VIRTUAL, SA_ONSTACK);

      break;

    case INNER:

      level = LEAF;

      return;

    }

}

main ()

{

  /* Set up the altstack.  */

  {

    static char stack[SIGSTKSZ * NR_LEVELS];

    stack_t alt;

    memset (&alt, 0, sizeof (alt));

    alt.ss_sp = stack;

    alt.ss_size = SIGSTKSZ;

    alt.ss_flags = 0;

    if (sigaltstack (&alt, NULL) < 0)

      {

        perror ("sigaltstack");

        exit (0);

      }

  }

  level = MAIN;

  catcher (0);

}