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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 <stdio.h>

#include <string.h>

#include <signal.h>

#include <sys/time.h>

#include <errno.h>

static volatile int done;

static void

handler (int sig)

{

  done = 1;

} /* handler */

struct itimerval itime;

struct sigaction action;

/* The enum is so that GDB can easily see these macro values.  */

enum {

  itimer_real = ITIMER_REAL,

  itimer_virtual = ITIMER_VIRTUAL

} itimer = ITIMER_VIRTUAL;

int

main ()

{

  int res;

  /* Set up the signal handler.  */

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

  action.sa_handler = handler;

  sigaction (SIGVTALRM, &action, NULL);

  sigaction (SIGALRM, &action, NULL);

  /* The values needed for the itimer.  This needs to be at least long

     enough for the setitimer() call to return.  */

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

  itime.it_value.tv_usec = 250 * 1000;

  /* Loop for ever, constantly taking an interrupt.  */

  while (1)

    {

      /* 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.  */

      res = setitimer (itimer, &itime, NULL);

      if (res == -1)

        {

          printf ("First call to setitimer failed, errno = %d\r\n",errno);

          itimer = ITIMER_REAL;

          res = setitimer (itimer, &itime, NULL);

          if (res == -1)

            {

              printf ("Second call to setitimer failed, errno = %d\r\n",errno);

              return 1;

            }

        }

      /* Wait.  */

      while (!done);

      done = 0;

    }

  return 0;

}