1 /* Signal Handlers that Return
2 Copyright (C) 1991-2017 Free Software Foundation, Inc.
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.
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.
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/>.
22 /* This flag controls termination of the main loop. */
23 volatile sig_atomic_t keep_going
= 1;
25 /* The signal handler just clears the flag and re-enables itself. */
30 signal (sig
, catch_alarm
);
36 puts ("Doing stuff while waiting for alarm....");
42 /* Establish a handler for SIGALRM signals. */
43 signal (SIGALRM
, catch_alarm
);
45 /* Set an alarm to go off in a little while. */
48 /* Check the flag once in a while to see when to quit. */