1 /* Copyright (C) 2003-2022 Free Software Foundation, Inc.
2    This file is part of the GNU C Library.
3 
4    The GNU C Library is free software; you can redistribute it and/or
5    modify it under the terms of the GNU Lesser General Public
6    License as published by the Free Software Foundation; either
7    version 2.1 of the License, or (at your option) any later version.
8 
9    The GNU C Library is distributed in the hope that it will be useful,
10    but WITHOUT ANY WARRANTY; without even the implied warranty of
11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12    Lesser General Public License for more details.
13 
14    You should have received a copy of the GNU Lesser General Public
15    License along with the GNU C Library; if not, see
16    <https://www.gnu.org/licenses/>.  */
17 
18 #include <errno.h>
19 #include <error.h>
20 #include <signal.h>
21 #include <stdlib.h>
22 #include <stdio.h>
23 
24 volatile int count;
25 
26 void
sh(int sig)27 sh (int sig)
28 {
29   ++count;
30 }
31 
32 int
main(void)33 main (void)
34 {
35   struct sigaction sa;
36   sa.sa_handler = sh;
37   sigemptyset (&sa.sa_mask);
38   sa.sa_flags = 0;
39   if (sigaction (SIGUSR1, &sa, NULL) < 0)
40     {
41       printf ("sigaction failed: %m\n");
42       exit (1);
43     }
44   if (raise (SIGUSR1) < 0)
45     {
46       printf ("first raise failed: %m\n");
47       exit (1);
48     }
49   if (raise (SIGUSR1) < 0)
50     {
51       printf ("second raise failed: %m\n");
52       exit (1);
53     }
54   if (count != 2)
55     {
56       printf ("signal handler not called 2 times\n");
57       exit (1);
58     }
59   exit (0);
60 }
61