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/*
* Copyright 2002 Sun Microsystems, Inc. All rights reserved.
*
* Use is subject to the GNU Lesser General Public License, Version 2.1,
* February 1999, which is contained in the read-me file named
* "README_GNU_LGPL." This library is free software; you can
* redistribute it and/or modify it under the terms of the GNU
* Lesser General Public License as published by the Free Software
* Foundation; either version 2.1 of the License, or (at your
* option) any later version. This library 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 Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA.
*
* implement time-related functions for panel utils. it's done this way
* because select() doesn't always work with the lcd driver. bleah.
*
* NOTE: as we want to make sure that all of the lcd utils know
* about each other, this is almost intentionally
* single-threaded.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <signal.h>
#include <sys/time.h>
#include <sys/types.h>
#include "lcdutils.h"
static struct itimerval timeout;
/* start up an alarm handler for timeouts. we have to do it
* this way because we can't do a select/poll on /dev/lcd
* and have it be meaningful. */
int lcd_timeout_start(void (*fcn)(int), const int seconds) {
struct sigaction act;
memset(&act, 0, sizeof(act));
act.sa_handler = fcn;
act.sa_flags = SA_RESTART;
if (sigaction(SIGALRM, &act, NULL) < 0)
return -1;
memset(&timeout, 0, sizeof(timeout));
timeout.it_interval.tv_sec = seconds;
timeout.it_value.tv_sec = seconds;
if (setitimer(ITIMER_REAL, &timeout, NULL) < 0) {
sigaction(SIGALRM, NULL, NULL);
return -1;
}
return 0;
}
/* stop and reset everything */
void lcd_timeout_stop(void) {
struct itimerval zero;
struct sigaction act;
memset(&zero, 0, sizeof(zero));
memset(&act, 0, sizeof(act));
setitimer(ITIMER_REAL, &zero, NULL);
act.sa_handler = SIG_DFL;
sigaction(SIGALRM, &act, NULL);
}
/* just do a reset */
int lcd_timeout_reset(void) {
return setitimer(ITIMER_REAL, &timeout, NULL);
}
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