NetBSD-5.0.2/usr.sbin/apmd/apmd.c
/* $NetBSD: apmd.c,v 1.31 2008/04/28 20:24:15 martin Exp $ */
/*-
* Copyright (c) 1996, 2000 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by John Kohl.
*
* 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.
*
* 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 FOUNDATION 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.
*/
#include <stdio.h>
#include <errno.h>
#include <syslog.h>
#include <fcntl.h>
#include <unistd.h>
#include <util.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <sys/types.h>
#include <pwd.h>
#include <grp.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/wait.h>
#include <poll.h>
#include <machine/apmvar.h>
#include <err.h>
#include "pathnames.h"
#include "apm-proto.h"
#define TRUE 1
#define FALSE 0
#define POWER_STATUS_ACON 0x1
#define POWER_STATUS_LOWBATTNOW 0x2
const char apmdev[] = _PATH_APM_CTLDEV;
const char sockfile[] = _PATH_APM_SOCKET;
static int debug = 0;
static int verbose = 0;
void usage (void);
int power_status (int fd, int force, struct apm_power_info *pinfo);
int bind_socket (const char *sn, mode_t mode, uid_t uid, gid_t gid);
enum apm_state handle_client(int sock_fd, int ctl_fd);
void suspend(int ctl_fd);
void stand_by(int ctl_fd);
void resume(int ctl_fd);
void sigexit(int signo);
void make_noise(int howmany);
void do_etc_file(const char *file);
void do_ac_state(int state);
void
sigexit(int signo)
{
exit(1);
}
void
usage(void)
{
fprintf(stderr,"usage: %s [-adlqsv] [-t seconds] [-S sockname]\n\t[-m sockmode] [-o sockowner:sockgroup] [-f devname]\n", getprogname());
exit(1);
}
int
power_status(int fd, int force, struct apm_power_info *pinfo)
{
struct apm_power_info bstate;
static struct apm_power_info last;
int acon = 0;
int lowbattnow = 0;
memset(&bstate, 0, sizeof(bstate));
if (ioctl(fd, APM_IOC_GETPOWER, &bstate) == 0) {
/* various conditions under which we report status: something changed
enough since last report, or asked to force a print */
if (bstate.ac_state == APM_AC_ON)
acon = 1;
if (bstate.battery_state != last.battery_state &&
bstate.battery_state == APM_BATT_LOW)
lowbattnow = 1;
if (force ||
bstate.ac_state != last.ac_state ||
bstate.battery_state != last.battery_state ||
(bstate.minutes_left && bstate.minutes_left < 15) ||
abs(bstate.battery_life - last.battery_life) > 20) {
if (verbose) {
if (bstate.minutes_left)
syslog(LOG_NOTICE,
"battery status: %s. external power status: %s. "
"estimated battery life %d%% (%d minutes)",
battstate(bstate.battery_state),
ac_state(bstate.ac_state), bstate.battery_life,
bstate.minutes_left);
else
syslog(LOG_NOTICE,
"battery status: %s. external power status: %s. "
"estimated battery life %d%%",
battstate(bstate.battery_state),
ac_state(bstate.ac_state), bstate.battery_life);
}
last = bstate;
}
if (pinfo)
*pinfo = bstate;
} else
syslog(LOG_ERR, "cannot fetch power status: %m");
return ((acon?POWER_STATUS_ACON:0) |
(lowbattnow?POWER_STATUS_LOWBATTNOW:0));
}
static char *socketname;
static void sockunlink(void);
static void
sockunlink(void)
{
if (socketname)
(void) remove(socketname);
}
int
bind_socket(const char *sockname, mode_t mode, uid_t uid, gid_t gid)
{
int sock;
struct sockaddr_un s_un;
sock = socket(AF_LOCAL, SOCK_STREAM, 0);
if (sock == -1)
err(1, "cannot create local socket");
s_un.sun_family = AF_LOCAL;
strncpy(s_un.sun_path, sockname, sizeof(s_un.sun_path));
s_un.sun_len = SUN_LEN(&s_un);
/* remove it if present, we're moving in */
(void) remove(sockname);
if (bind(sock, (struct sockaddr *)&s_un, s_un.sun_len) == -1)
err(1, "cannot create APM socket");
if (chmod(sockname, mode) == -1 || chown(sockname, uid, gid) == -1)
err(1, "cannot set socket mode/owner/group to %o/%d/%d",
mode, uid, gid);
listen(sock, 1);
socketname = strdup(sockname);
atexit(sockunlink);
return sock;
}
enum apm_state
handle_client(int sock_fd, int ctl_fd)
{
/* accept a handle from the client, process it, then clean up */
int cli_fd;
struct sockaddr_un from;
socklen_t fromlen = sizeof(from);
struct apm_command cmd;
struct apm_reply reply;
cli_fd = accept(sock_fd, (struct sockaddr *)&from, &fromlen);
if (cli_fd == -1) {
syslog(LOG_INFO, "client accept failure: %m");
return NORMAL;
}
if (recv(cli_fd, &cmd, sizeof(cmd), 0) != sizeof(cmd)) {
(void) close(cli_fd);
syslog(LOG_INFO, "client size botch");
return NORMAL;
}
if (cmd.vno != APMD_VNO) {
close(cli_fd); /* terminate client */
/* no error message, just drop it. */
return NORMAL;
}
power_status(ctl_fd, 0, &reply.batterystate);
switch (cmd.action) {
default:
reply.newstate = NORMAL;
break;
case SUSPEND:
reply.newstate = SUSPENDING;
break;
case STANDBY:
reply.newstate = STANDING_BY;
break;
}
reply.vno = APMD_VNO;
if (send(cli_fd, &reply, sizeof(reply), 0) != sizeof(reply)) {
syslog(LOG_INFO, "client reply botch");
}
close(cli_fd);
return reply.newstate;
}
static int speaker_ok = TRUE;
void
make_noise(howmany)
int howmany;
{
int spkrfd;
int trycnt;
if (!speaker_ok) /* don't bother after sticky errors */
return;
for (trycnt = 0; trycnt < 3; trycnt++) {
spkrfd = open(_PATH_DEV_SPEAKER, O_WRONLY);
if (spkrfd == -1) {
switch (errno) {
case EBUSY:
usleep(500000);
errno = EBUSY;
continue;
case ENOENT:
case ENODEV:
case ENXIO:
case EPERM:
case EACCES:
syslog(LOG_INFO,
"speaker device " _PATH_DEV_SPEAKER " unavailable: %m");
speaker_ok = FALSE;
return;
}
} else
break;
}
if (spkrfd == -1) {
syslog(LOG_WARNING, "cannot open " _PATH_DEV_SPEAKER ": %m");
return;
}
syslog(LOG_DEBUG, "sending %d tones to speaker\n", howmany);
write (spkrfd, "o4cc", 2 + howmany);
close(spkrfd);
return;
}
void
suspend(int ctl_fd)
{
do_etc_file(_PATH_APM_ETC_SUSPEND);
sync();
make_noise(2);
sync();
sync();
sleep(1);
ioctl(ctl_fd, APM_IOC_SUSPEND, 0);
}
void
stand_by(int ctl_fd)
{
do_etc_file(_PATH_APM_ETC_STANDBY);
sync();
make_noise(1);
sync();
sync();
sleep(1);
ioctl(ctl_fd, APM_IOC_STANDBY, 0);
}
#define TIMO (10*60) /* 10 minutes */
void
resume(int ctl_fd)
{
do_etc_file(_PATH_APM_ETC_RESUME);
}
int
main(int argc, char *argv[])
{
const char *fname = apmdev;
int ctl_fd, sock_fd, ch, ready;
int statonly = 0;
struct pollfd set[2];
struct apm_event_info apmevent;
int suspends, standbys, resumes;
int ac_is_off;
int noacsleep = 0;
int lowbattsleep = 0;
mode_t mode = 0660;
unsigned long timeout = TIMO;
const char *sockname = sockfile;
char *user, *group;
char *scratch;
uid_t uid = 2; /* operator */
gid_t gid = 5; /* operator */
struct passwd *pw;
struct group *gr;
while ((ch = getopt(argc, argv, "adlqsvf:t:S:m:o:")) != -1)
switch(ch) {
case 'q':
speaker_ok = FALSE;
break;
case 'a':
noacsleep = 1;
break;
case 'l':
lowbattsleep = 1;
break;
case 'd':
debug = 1;
break;
case 'v':
verbose = 1;
break;
case 'f':
fname = optarg;
break;
case 'S':
sockname = optarg;
break;
case 't':
timeout = strtoul(optarg, 0, 0);
if (timeout == 0)
usage();
break;
case 'm':
mode = strtoul(optarg, 0, 8);
if (mode == 0)
usage();
break;
case 'o':
/* (user):(group) */
user = optarg;
group = strchr(user, ':');
if (group)
*group++ = '\0';
if (*user) {
uid = strtoul(user, &scratch, 0);
if (*scratch != '\0') {
pw = getpwnam(user);
if (pw)
uid = pw->pw_uid;
else
errx(1, "user name `%s' unknown", user);
}
}
if (group && *group) {
gid = strtoul(group, &scratch, 0);
if (*scratch != '\0') {
gr = getgrnam(group);
if (gr)
gid = gr->gr_gid;
else
errx(1, "group name `%s' unknown", group);
}
}
break;
case 's': /* status only */
statonly = 1;
break;
case '?':
default:
usage();
}
argc -= optind;
argv += optind;
if (debug) {
openlog("apmd", 0, LOG_LOCAL1);
} else {
daemon(0, 0);
openlog("apmd", 0, LOG_DAEMON);
setlogmask(LOG_UPTO(LOG_NOTICE));
pidfile(NULL);
}
if ((ctl_fd = open(fname, O_RDWR)) == -1) {
syslog(LOG_ERR, "cannot open device file `%s'", fname);
exit(1);
}
if (statonly) {
power_status(ctl_fd, 1, 0);
exit(0);
} else {
struct apm_power_info pinfo;
power_status(ctl_fd, 1, &pinfo);
do_ac_state(pinfo.ac_state);
ac_is_off = (pinfo.ac_state == APM_AC_OFF);
}
(void) signal(SIGTERM, sigexit);
(void) signal(SIGHUP, sigexit);
(void) signal(SIGINT, sigexit);
(void) signal(SIGPIPE, SIG_IGN);
sock_fd = bind_socket(sockname, mode, uid, gid);
set[0].fd = ctl_fd;
set[0].events = POLLIN;
set[1].fd = sock_fd;
set[1].events = POLLIN;
for (errno = 0;
(ready = poll(set, 2, timeout * 1000)) >= 0 || errno == EINTR;
errno = 0) {
if (errno == EINTR)
continue;
if (ready == 0) {
int status;
/* wakeup for timeout: take status */
status = power_status(ctl_fd, 0, 0);
if (lowbattsleep && status&POWER_STATUS_LOWBATTNOW) {
if (noacsleep && status&POWER_STATUS_ACON) {
if (debug)
syslog(LOG_DEBUG,
"not sleeping because "
"AC is connected");
} else
suspend(ctl_fd);
}
}
if (set[0].revents & POLLIN) {
suspends = standbys = resumes = 0;
while (ioctl(ctl_fd, APM_IOC_NEXTEVENT, &apmevent) == 0) {
if (debug)
syslog(LOG_DEBUG, "apmevent %04x index %d", apmevent.type,
apmevent.index);
switch (apmevent.type) {
case APM_SUSPEND_REQ:
case APM_USER_SUSPEND_REQ:
case APM_CRIT_SUSPEND_REQ:
suspends++;
break;
case APM_BATTERY_LOW:
if (lowbattsleep)
suspends++;
break;
case APM_USER_STANDBY_REQ:
case APM_STANDBY_REQ:
standbys++;
break;
#if 0
case APM_CANCEL:
suspends = standbys = 0;
break;
#endif
case APM_NORMAL_RESUME:
case APM_CRIT_RESUME:
case APM_SYS_STANDBY_RESUME:
resumes++;
break;
case APM_POWER_CHANGE:
{
struct apm_power_info pinfo;
power_status(ctl_fd, 0, &pinfo);
/* power status can change without ac status changing */
if (ac_is_off != (pinfo.ac_state == APM_AC_OFF)) {
do_ac_state(pinfo.ac_state);
ac_is_off = (pinfo.ac_state == APM_AC_OFF);
}
break;
}
default:
break;
}
}
if ((standbys || suspends) && noacsleep &&
(power_status(ctl_fd, 0, 0) & POWER_STATUS_ACON)) {
if (debug)
syslog(LOG_DEBUG, "not sleeping because AC is connected");
} else if (suspends) {
suspend(ctl_fd);
} else if (standbys) {
stand_by(ctl_fd);
} else if (resumes) {
resume(ctl_fd);
if (verbose)
syslog(LOG_NOTICE, "system resumed from APM sleep");
}
ready--;
}
if (ready == 0)
continue;
if (set[1].revents & POLLIN) {
switch (handle_client(sock_fd, ctl_fd)) {
case NORMAL:
break;
case SUSPENDING:
suspend(ctl_fd);
break;
case STANDING_BY:
stand_by(ctl_fd);
break;
}
}
}
syslog(LOG_ERR, "poll failed: %m");
exit(1);
}
void
do_etc_file(const char *file)
{
pid_t pid;
int status;
const char *prog;
/* If file doesn't exist, do nothing. */
if (access(file, X_OK|R_OK)) {
if (debug)
syslog(LOG_DEBUG, "do_etc_file(): cannot access file %s", file);
return;
}
prog = strrchr(file, '/');
if (prog)
prog++;
else
prog = file;
pid = fork();
switch (pid) {
case -1:
syslog(LOG_ERR, "failed to fork(): %m");
return;
case 0:
/* We are the child. */
if (execl(file, prog, NULL) == -1)
syslog(LOG_ERR, "could not execute \"%s\": %m", file);
_exit(1);
/* NOTREACHED */
default:
/* We are the parent. */
wait4(pid, &status, 0, 0);
if (WIFEXITED(status)) {
if (debug)
syslog(LOG_DEBUG, "%s exited with status %d", file,
WEXITSTATUS(status));
} else
syslog(LOG_ERR, "%s exited abnormally.", file);
break;
}
}
void
do_ac_state(int state)
{
switch (state) {
case APM_AC_OFF:
do_etc_file(_PATH_APM_ETC_BATTERY);
break;
case APM_AC_ON:
case APM_AC_BACKUP:
do_etc_file(_PATH_APM_ETC_LINE);
break;
default:
/* Silently ignore */ ;
}
}