NetBSD/usr.sbin/powerd/powerd.c

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2003-07-13 16:18:55 +04:00
/* $NetBSD: powerd.c,v 1.3 2003/07/13 12:19:45 itojun Exp $ */
/*
* Copyright (c) 2003 Wasabi Systems, Inc.
* All rights reserved.
*
* Written by Jason R. Thorpe for Wasabi Systems, Inc.
*
* 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 for the NetBSD Project by
* Wasabi Systems, Inc.
* 4. The name of Wasabi Systems, Inc. may not be used to endorse
* or promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``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 WASABI SYSTEMS, INC
* 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.
*/
/*
* Power management daemon for sysmon.
*/
#include <sys/param.h>
#include <sys/event.h>
#include <sys/power.h>
#include <sys/wait.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <sysexits.h>
#include <syslog.h>
#include <unistd.h>
#include <util.h>
int debug;
static int kq;
#define A_CNT(x) (sizeof((x)) / sizeof((x)[0]))
#define _PATH_DEV_POWER "/dev/power"
#define _PATH_POWERD_SCRIPTS "/etc/powerd/scripts"
static void usage(void);
static void run_script(const char *[]);
static struct kevent *allocchange(void);
static int wait_for_events(struct kevent *, size_t);
static void dispatch_dev_power(struct kevent *);
static void dispatch_power_event_switch_state_change(power_event_t *);
static const char *script_paths[] = {
NULL,
_PATH_POWERD_SCRIPTS
};
int
main(int argc, char *argv[])
{
struct kevent *ev, events[16];
struct power_type power_type;
char *cp;
int ch, fd;
while ((ch = getopt(argc, argv, "d")) != -1) {
switch (ch) {
case 'd':
debug = 1;
break;
default:
usage();
}
}
argc -= optind;
argv += optind;
if (argc)
usage();
if (debug == 0)
daemon(0, 0);
openlog("powerd", LOG_PID | LOG_NOWAIT, LOG_DAEMON);
pidfile(NULL);
kq = kqueue();
if (kq < 0) {
syslog(LOG_ERR, "kqueue: %m");
exit(EX_OSERR);
}
fd = open(_PATH_DEV_POWER, O_RDONLY|O_NONBLOCK, 0600);
if (fd < 0) {
syslog(LOG_ERR, "open %s: %m", _PATH_DEV_POWER);
exit(EX_OSERR);
}
if (ioctl(fd, POWER_IOC_GET_TYPE, &power_type) < 0) {
syslog(LOG_ERR, "POWER_IOC_GET_TYPE: %m");
exit(EX_OSERR);
}
asprintf(&cp, "%s/%s", _PATH_POWERD_SCRIPTS, power_type.power_type);
if (cp == NULL) {
syslog(LOG_ERR, "allocating script path: %m");
exit(EX_OSERR);
}
script_paths[0] = cp;
ev = allocchange();
EV_SET(ev, fd, EVFILT_READ, EV_ADD | EV_ENABLE,
0, 0, (intptr_t) dispatch_dev_power);
for (;;) {
void (*handler)(struct kevent *);
int i, rv;
rv = wait_for_events(events, A_CNT(events));
for (i = 0; i < rv; i++) {
handler = (void *) events[i].udata;
(*handler)(&events[i]);
}
}
}
static void
usage(void)
{
fprintf(stderr, "usage: %s [-d]\n", getprogname());
exit(EX_USAGE);
}
static void
run_script(const char *argv[])
{
char path[MAXPATHLEN+1];
int i;
for (i = 0; i < A_CNT(script_paths); i++) {
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snprintf(path, sizeof(path), "%s/%s", script_paths[i], argv[0]);
if (access(path, R_OK|X_OK) == 0) {
int status;
pid_t pid;
argv[0] = path;
if (debug) {
fprintf(stderr, "running script: %s", argv[0]);
for (i = 1; argv[i] != NULL; i++)
fprintf(stderr, " %s", argv[i]);
fprintf(stderr, "\n");
}
switch ((pid = vfork())) {
case -1:
syslog(LOG_ERR, "fork to run script: %m");
return;
case 0:
/* Child. */
(void) execv(path, (char **)argv);
_exit(1);
/* NOTREACHED */
default:
/* Parent. */
(void) wait4(pid, &status, 0, 0);
if (WIFEXITED(status) &&
WEXITSTATUS(status) != 0) {
syslog(LOG_ERR,
"%s exited with status %d",
path, WEXITSTATUS(status));
} else if (!WIFEXITED(status)) {
syslog(LOG_ERR,
"%s terminated abnormally", path);
}
break;
}
return;
}
}
syslog(LOG_ERR, "no script for %s", argv[0]);
if (debug)
fprintf(stderr, "no script for %s\n", argv[0]);
}
static struct kevent changebuf[8];
static int nchanges;
static struct kevent *
allocchange(void)
{
if (nchanges == A_CNT(changebuf)) {
(void) wait_for_events(NULL, 0);
nchanges = 0;
}
return (&changebuf[nchanges++]);
}
static int
wait_for_events(struct kevent *events, size_t nevents)
{
int rv;
while ((rv = kevent(kq, nchanges ? changebuf : NULL, nchanges,
events, nevents, NULL)) < 0) {
nchanges = 0;
if (errno != EINTR) {
syslog(LOG_ERR, "kevent: %m");
exit(EX_OSERR);
}
}
return (rv);
}
static const char *
pswitch_type_name(int type)
{
switch (type) {
case PSWITCH_TYPE_POWER:
return ("power_button");
case PSWITCH_TYPE_SLEEP:
return ("sleep_button");
case PSWITCH_TYPE_LID:
return ("lid_switch");
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case PSWITCH_TYPE_RESET:
return ("reset_button");
default:
return ("=unknown pswitch type=");
}
}
static const char *
pswitch_event_name(int type)
{
switch (type) {
case PSWITCH_EVENT_PRESSED:
return ("pressed");
case PSWITCH_EVENT_RELEASED:
return ("released");
default:
return ("=unknown pswitch event=");
}
}
static void
dispatch_dev_power(struct kevent *ev)
{
power_event_t pev;
int fd = ev->ident;
if (debug)
fprintf(stderr, "dispatch_dev_power: %" PRId64
" events available\n", ev->data);
again:
if (read(fd, &pev, sizeof(pev)) != sizeof(pev)) {
if (errno == EWOULDBLOCK)
return;
syslog(LOG_ERR, "read of %s: %m", _PATH_DEV_POWER);
exit(EX_OSERR);
}
if (debug) {
fprintf(stderr, "dispatch_dev_power: event type %d\n",
pev.pev_type);
}
switch (pev.pev_type) {
case POWER_EVENT_SWITCH_STATE_CHANGE:
dispatch_power_event_switch_state_change(&pev);
break;
default:
syslog(LOG_INFO, "unknown %s event type: %d",
_PATH_DEV_POWER, pev.pev_type);
}
goto again;
}
static void
dispatch_power_event_switch_state_change(power_event_t *pev)
{
const char *argv[4];
argv[0] = pswitch_type_name(pev->pev_switch.psws_type);
argv[1] = pev->pev_switch.psws_name;
argv[2] = pswitch_event_name(pev->pev_switch.psws_state);
argv[3] = NULL;
if (debug)
fprintf(stderr, "%s on %s %s\n", argv[0], argv[1], argv[2]);
run_script(argv);
}