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

   Copyright 2004, 2005, 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 <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <signal.h>

#include <sys/time.h>

static volatile int done[2];

static volatile int repeats[2];

static int itimer[2] = { ITIMER_REAL, ITIMER_VIRTUAL };

static int alarm[2] = { SIGALRM, SIGVTALRM };

static void

handler (int sig)

{

  int sigi;

  switch (sig)

    {

    case SIGALRM: sigi = 0; break;

    case SIGVTALRM: sigi = 1; break;

    default: abort ();

    }

  if (repeats[sigi]++ > 3)

    {

      /* Hit with enough signals, cancel everything and get out.  */

      {

        struct itimerval itime;

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

        setitimer (itimer[sigi], &itime, NULL);

      }

      {

        struct sigaction action;

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

        action.sa_handler = SIG_IGN;

        sigaction (sig, &action, NULL);

      }

      done[sigi] = 1;

      return;

    }

  /* Set up a nested virtual timer.  */

  while (1)

    {

      /* Wait until a signal has become pending, that way when this

         handler returns it will be immediatly delivered leading to

         back-to-back signals.  */

      sigset_t set;

      sigemptyset (&set);

      if (sigpending (&set) < 0)

        {

          perror ("sigrepeat");

          abort ();

        }

      if (sigismember (&set, sig))

        break;

    }

} /* handler */

int

main ()

{

  int i;

  /* Set up the signal handler.  */

  for (i = 0; i < 2; i++)

    {

      struct sigaction action;

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

      action.sa_handler = handler;

      sigaction (alarm[i], &action, NULL);

    }

  /* Set up a rapidly repeating timers.  A timer, rather than SIGSEGV,

     is used as after a timer handler returns the interrupted code can

     safely resume.  The intent is for the program to swamp GDB with a

     backlog of pending signals.  */

  for (i = 0; i < 2; i++)

    {

      struct itimerval itime;

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

      itime.it_interval.tv_usec = 1;

      itime.it_value.tv_usec = 250 * 1000;

      setitimer (itimer[i], &itime, NULL);

    }

  /* Wait.  */

  while (!done[0] && !done[1]); /* infinite loop */

  return 0;

}