mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-30 00:31:08 +00:00
54 lines
1.4 KiB
C
54 lines
1.4 KiB
C
/* Signal Handlers that Return
|
|
Copyright (C) 1991-2017 Free Software Foundation, Inc.
|
|
|
|
This program is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU General Public License
|
|
as published by the Free Software Foundation; either version 2
|
|
of the License, or (at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, if not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include <signal.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
|
|
/* This flag controls termination of the main loop. */
|
|
volatile sig_atomic_t keep_going = 1;
|
|
|
|
/* The signal handler just clears the flag and re-enables itself. */
|
|
void
|
|
catch_alarm (int sig)
|
|
{
|
|
keep_going = 0;
|
|
signal (sig, catch_alarm);
|
|
}
|
|
|
|
void
|
|
do_stuff (void)
|
|
{
|
|
puts ("Doing stuff while waiting for alarm....");
|
|
}
|
|
|
|
int
|
|
main (void)
|
|
{
|
|
/* Establish a handler for SIGALRM signals. */
|
|
signal (SIGALRM, catch_alarm);
|
|
|
|
/* Set an alarm to go off in a little while. */
|
|
alarm (2);
|
|
|
|
/* Check the flag once in a while to see when to quit. */
|
|
while (keep_going)
|
|
do_stuff ();
|
|
|
|
return EXIT_SUCCESS;
|
|
}
|