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d9a17c07 | 1 | /* Signal Handlers that Return |
f7a9f785 | 2 | Copyright (C) 1991-2016 Free Software Foundation, Inc. |
d9a17c07 RM |
3 | |
4 | This program is free software; you can redistribute it and/or | |
5 | modify it under the terms of the GNU General Public License | |
6 | as published by the Free Software Foundation; either version 2 | |
7 | of the License, or (at your option) any later version. | |
8 | ||
9 | This program 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 | |
12 | GNU General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU General Public License | |
15 | along with this program; if not, if not, see <http://www.gnu.org/licenses/>. | |
16 | */ | |
17 | ||
28f540f4 RM |
18 | #include <signal.h> |
19 | #include <stdio.h> | |
20 | #include <stdlib.h> | |
21 | ||
22 | /* This flag controls termination of the main loop. */ | |
23 | volatile sig_atomic_t keep_going = 1; | |
24 | ||
25 | /* The signal handler just clears the flag and re-enables itself. */ | |
d9a17c07 | 26 | void |
28f540f4 RM |
27 | catch_alarm (int sig) |
28 | { | |
29 | keep_going = 0; | |
30 | signal (sig, catch_alarm); | |
31 | } | |
32 | ||
d9a17c07 | 33 | void |
28f540f4 RM |
34 | do_stuff (void) |
35 | { | |
36 | puts ("Doing stuff while waiting for alarm...."); | |
37 | } | |
38 | ||
39 | int | |
40 | main (void) | |
41 | { | |
42 | /* Establish a handler for SIGALRM signals. */ | |
43 | signal (SIGALRM, catch_alarm); | |
44 | ||
45 | /* Set an alarm to go off in a little while. */ | |
46 | alarm (2); | |
47 | ||
48 | /* Check the flag once in a while to see when to quit. */ | |
49 | while (keep_going) | |
50 | do_stuff (); | |
51 | ||
52 | return EXIT_SUCCESS; | |
53 | } |