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
24volatile int count;
25
26void
27sh (int sig)
28{
29 ++count;
30}
31
32int
33main (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, act: &sa, NULL) < 0)
40 {
41 printf (format: "sigaction failed: %m\n");
42 exit (1);
43 }
44 if (raise (SIGUSR1) < 0)
45 {
46 printf (format: "first raise failed: %m\n");
47 exit (1);
48 }
49 if (raise (SIGUSR1) < 0)
50 {
51 printf (format: "second raise failed: %m\n");
52 exit (1);
53 }
54 if (count != 2)
55 {
56 printf (format: "signal handler not called 2 times\n");
57 exit (1);
58 }
59 exit (0);
60}
61

source code of glibc/signal/tst-raise.c