1/* This testcase is part of GDB, the GNU debugger.
2
3   Copyright 2004, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
4
5   This program is free software; you can redistribute it and/or modify
6   it under the terms of the GNU General Public License as published by
7   the Free Software Foundation; either version 3 of the License, or
8   (at your option) any later version.
9
10   This program is distributed in the hope that it will be useful,
11   but WITHOUT ANY WARRANTY; without even the implied warranty of
12   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13   GNU General Public License for more details.
14
15   You should have received a copy of the GNU General Public License
16   along with this program.  If not, see <http://www.gnu.org/licenses/>.
17
18*/
19
20#include <stdio.h>
21#include <string.h>
22#include <signal.h>
23#include <sys/time.h>
24#include <errno.h>
25
26static volatile int done;
27
28static void
29handler (int sig)
30{
31  done = 1;
32} /* handler */
33
34struct itimerval itime;
35struct sigaction action;
36
37/* The enum is so that GDB can easily see these macro values.  */
38enum {
39  itimer_real = ITIMER_REAL,
40  itimer_virtual = ITIMER_VIRTUAL
41} itimer = ITIMER_VIRTUAL;
42
43int
44main ()
45{
46
47  int res;
48  /* Set up the signal handler.  */
49  memset (&action, 0, sizeof (action));
50  action.sa_handler = handler;
51  sigaction (SIGVTALRM, &action, NULL);
52  sigaction (SIGALRM, &action, NULL);
53
54  /* The values needed for the itimer.  This needs to be at least long
55     enough for the setitimer() call to return.  */
56  memset (&itime, 0, sizeof (itime));
57  itime.it_value.tv_usec = 250 * 1000;
58
59  /* Loop for ever, constantly taking an interrupt.  */
60  while (1)
61    {
62      /* Set up a one-off timer.  A timer, rather than SIGSEGV, is
63	 used as after a timer handler finishes the interrupted code
64	 can safely resume.  */
65      res = setitimer (itimer, &itime, NULL);
66      if (res == -1)
67	{
68	  printf ("First call to setitimer failed, errno = %d\r\n",errno);
69	  itimer = ITIMER_REAL;
70	  res = setitimer (itimer, &itime, NULL);
71	  if (res == -1)
72	    {
73	      printf ("Second call to setitimer failed, errno = %d\r\n",errno);
74	      return 1;
75	    }
76	}
77      /* Wait.  */
78      while (!done);
79      done = 0;
80    }
81  return 0;
82}
83