NetBSD/usr.sbin/screenblank/screenblank.c

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/* $NetBSD: screenblank.c,v 1.3 1996/06/23 22:08:43 thorpej Exp $ */
/*-
* Copyright (c) 1996 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Screensaver daemon for the Sun 3 and SPARC.
*/
#include <sys/types.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/queue.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <math.h>
#include <paths.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <signal.h>
#include <unistd.h>
#include <machine/fbio.h>
#include "pathnames.h"
struct dev_stat {
LIST_ENTRY(dev_stat) ds_link; /* linked list */
char *ds_path; /* path to device */
int ds_isfb; /* boolean; framebuffer? */
time_t ds_atime; /* time device last accessed */
time_t ds_mtime; /* time device last modified */
};
LIST_HEAD(ds_list, dev_stat) ds_list;
extern char *__progname;
static void add_dev __P((char *, int));
static void change_state __P((int));
static void cvt_arg __P((char *, struct timeval *));
static void logpid __P((void));
static void sighandler __P((int, int, struct sigcontext *));
static void usage __P((void));
int
main(argc, argv)
int argc;
char **argv;
{
struct dev_stat *dsp;
struct timeval timo_on, timo_off, *tvp;
struct sigaction sa;
struct stat st;
int ch, change, fflag = 0, kflag = 0, mflag = 0, state;
LIST_INIT(&ds_list);
/*
* Set the default timeouts: 10 minutes on, .25 seconds off.
*/
timo_on.tv_sec = 600;
timo_on.tv_usec = 0;
timo_off.tv_sec = 0;
timo_off.tv_usec = 250000;
while ((ch = getopt(argc, argv, "d:e:f:km")) != -1) {
switch (ch) {
case 'd':
cvt_arg(optarg, &timo_on);
break;
case 'e':
cvt_arg(optarg, &timo_off);
break;
case 'f':
fflag = 1;
add_dev(optarg, 1);
break;
case 'k':
if (mflag || kflag)
usage();
kflag = 1;
break;
case 'm':
if (kflag || mflag)
usage();
mflag = 1;
break;
default:
usage();
}
}
argc -= optind;
if (argc)
usage();
/*
* Add the keyboard, mouse, and default framebuffer devices
* as necessary. We _always_ check the console device.
*/
add_dev(_PATH_CONSOLE, 0);
if (!kflag)
add_dev(_PATH_KEYBOARD, 0);
if (!mflag)
add_dev(_PATH_MOUSE, 0);
if (!fflag)
add_dev(_PATH_FB, 1);
/* Ensure that the framebuffer is on. */
state = FBVIDEO_ON;
change_state(state);
tvp = &timo_on;
/*
* Make sure the framebuffer gets turned back on when we're
* killed.
*/
sa.sa_handler = sighandler;
sa.sa_flags = SA_NOCLDSTOP;
if (sigemptyset(&sa.sa_mask))
err(1, "sigemptyset");
if (sigaction(SIGINT, &sa, NULL) || sigaction(SIGTERM, &sa, NULL) ||
sigaction(SIGHUP, &sa, NULL))
err(1, "sigaction");
/* Detach. */
if (daemon(0, 0))
err(1, "daemon");
logpid();
/* Start the state machine. */
for (;;) {
change = 0;
for (dsp = ds_list.lh_first; dsp != NULL;
dsp = dsp->ds_link.le_next) {
/* Don't check framebuffers. */
if (dsp->ds_isfb)
continue;
if (stat(dsp->ds_path, &st) < 0)
err(1, "stat: %s", dsp->ds_path);
if (st.st_atime > dsp->ds_atime) {
change = 1;
dsp->ds_atime = st.st_atime;
}
if (st.st_mtime > dsp->ds_mtime) {
change = 1;
dsp->ds_mtime = st.st_mtime;
}
}
switch (state) {
case FBVIDEO_ON:
if (!change) {
state = FBVIDEO_OFF;
change_state(state);
tvp = &timo_off;
}
break;
case FBVIDEO_OFF:
if (change) {
state = FBVIDEO_ON;
change_state(state);
tvp = &timo_on;
}
break;
}
if (select(0, NULL, NULL, NULL, tvp) < 0)
err(1, "select");
}
/* NOTREACHED */
}
static void
add_dev(path, isfb)
char *path;
int isfb;
{
struct dev_stat *dsp1, *dsp2;
/* Create the entry... */
dsp1 = malloc(sizeof(struct dev_stat));
if (dsp1 == NULL)
errx(1, "can't allocate memory for %s", path);
bzero(dsp1, sizeof(struct dev_stat));
dsp1->ds_path = path;
dsp1->ds_isfb = isfb;
/* ...and put it in the list. */
if (ds_list.lh_first == NULL) {
LIST_INSERT_HEAD(&ds_list, dsp1, ds_link);
} else {
for (dsp2 = ds_list.lh_first; dsp2->ds_link.le_next != NULL;
dsp2 = dsp2->ds_link.le_next)
/* Nothing. */ ;
LIST_INSERT_AFTER(dsp2, dsp1, ds_link);
}
}
/* ARGSUSED */
static void
sighandler(sig, code, context)
int sig, code;
struct sigcontext *context;
{
/* Kill the pid file and re-enable the framebuffer before exit. */
(void)unlink(_PATH_SCREENBLANKPID);
change_state(FBVIDEO_ON);
exit(0);
}
static void
change_state(state)
int state;
{
struct dev_stat *dsp;
int fd;
for (dsp = ds_list.lh_first; dsp != NULL; dsp = dsp->ds_link.le_next) {
/* Don't change the state of non-framebuffers! */
if (dsp->ds_isfb == 0)
continue;
if ((fd = open(dsp->ds_path, O_RDWR, 0)) < 0) {
warn("open: %s", dsp->ds_path);
continue;
}
if (ioctl(fd, FBIOSVIDEO, &state) < 0)
warn("ioctl: %s", dsp->ds_path);
(void)close(fd);
}
}
static void
cvt_arg(arg, tvp)
char *arg;
struct timeval *tvp;
{
char *cp;
double seconds = 0.0, exponent = -1.0;
int period = 0;
for (cp = arg; *cp != '\0'; ++cp) {
if (*cp == '.') {
if (period)
errx(1, "invalid argument: %s", arg);
period = 1;
continue;
}
if (!isdigit(*cp))
errx(1, "invalid argument: %s", arg);
if (period) {
seconds = seconds + ((*cp - '0') * pow(10.0, exponent));
exponent -= 1.0;
} else
seconds = (seconds * 10.0) + (*cp - '0');
}
tvp->tv_sec = (long)seconds;
tvp->tv_usec = (long)((seconds - tvp->tv_sec) * 1000000);
}
static void
logpid()
{
FILE *fp;
if ((fp = fopen(_PATH_SCREENBLANKPID, "w")) != NULL) {
fprintf(fp, "%u\n", getpid());
(void)fclose(fp);
}
}
static void
usage()
{
fprintf(stderr, "usage: %s [-k | -m] [-d timeout] [-e timeout] %s\n",
__progname, "[-f framebuffer]");
exit(1);
}