1/* This testcase is part of GDB, the GNU debugger.
2
3   Copyright 2012-2020 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#include <stdio.h>
18#include <stdlib.h>
19#include <signal.h>
20#include <sys/wait.h>
21#include <unistd.h>
22
23void
24do_nothing (void)
25{
26}
27
28void
29handle (int sig)
30{
31  do_nothing (); /* handle marker */
32}
33
34int
35main ()
36{
37  int i;
38  signal (SIGHUP, handle);
39
40  raise (SIGHUP);		/* first HUP */
41
42  signal (SIGCHLD, handle);
43  for (i = 0; i < 3; i++)	/* fork loop */
44    {
45      switch (fork())
46	{
47	case -1:
48	  perror ("fork");
49	  exit (1);
50	case 0:
51	  exit (0);
52	}
53      wait (NULL);
54    }
55
56  raise (SIGHUP);		/* second HUP */
57
58  raise (SIGHUP);		/* third HUP */
59}
60
61