cmd/power/powerd.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 * Copyright 2016 Nexenta Systems, Inc. All rights reserved.
 */

#include <stdio.h>          /* Standard */
#include <stdlib.h>
#include <fcntl.h>
#include <sys/types.h>
#include <time.h>
#include <string.h>
#include <errno.h>
#include <pwd.h>
#include <dirent.h>
#include <thread.h>
#include <limits.h>
#include <sys/todio.h>          /* Time-Of-Day chip */
#include <sys/stat.h>
#include <sys/wait.h>
#include <sys/ipc.h>            /* IPC functions */
#include <signal.h>         /* signal handling */
#include <syslog.h>
#include <unistd.h>
#include <libdevinfo.h>
#include <poll.h>
#include <sys/pm.h>         /* power management driver */
#include <sys/uadmin.h>
#include <sys/openpromio.h>     /* for prom access */
#include <sys/sysmacros.h>      /* for MIN & MAX macros */
#include <sys/modctl.h>
#include <sys/stropts.h>        /* for INFTIM */
#include <sys/pbio.h>
#include <sys/cpr.h>
#include <sys/srn.h>
#include <stdarg.h>

#include "powerd.h"

/* External Functions */
extern struct tm *localtime_r(const time_t *, struct tm *);
extern void sysstat_init(void);
extern int check_tty(hrtime_t *, int);
extern int check_disks(hrtime_t *, int);
extern int check_load_ave(hrtime_t *, float);
extern int check_nfs(hrtime_t *, int);
extern int last_disk_activity(hrtime_t *, int);
extern int last_tty_activity(hrtime_t *, int);
extern int last_load_ave_activity(hrtime_t *);
extern int last_nfs_activity(hrtime_t *, int);

#define PM      "/dev/pm"
#define TOD     "/dev/tod"
#define PROM        "/dev/openprom"
#define PB      "/dev/power_button"
#define SRN     "/dev/srn"
#define LOGFILE     "./powerd.log"

#define PBM_THREAD  0
#define ATTACH_THREAD   1
#define NUM_THREADS 2

#define CHECK_INTERVAL  5
#define IDLECHK_INTERVAL    15
#define MINS_TO_SECS    60
#define HOURS_TO_SECS   (60 * 60)
#define DAYS_TO_SECS    (24 * 60 * 60)
#define HOURS_TO_MINS   60
#define DAYS_TO_MINS    (24 * 60)

#define LIFETIME_SECS           (7 * 365 * DAYS_TO_SECS)
#define DEFAULT_POWER_CYCLE_LIMIT   10000
#define DEFAULT_SYSTEM_BOARD_DATE   804582000   /* July 1, 1995 */

#define LLEN 80

typedef enum {root, options} prom_node_t;

/* State Variables */
static struct cprconfig asinfo;
static time_t       shutdown_time;  /* Time for next shutdown check */
static time_t       checkidle_time; /* Time for next idleness check */
static time_t       last_resume;
pwr_info_t      *info;      /* private as config data buffer */
static int      pb_fd;      /* power button driver */
static int      broadcast;  /* Enables syslog messages */
static int      start_calc;
static int      autoshutdown_en;
static int      do_idlecheck;
static int      got_sighup;
static int      estar_v2_prop;
static int      estar_v3_prop;
static int      log_power_cycles_error = 0;
static int      log_system_board_date_error = 0;
static int      log_no_autoshutdown_warning = 0;
static mutex_t      poweroff_mutex;

static char *autoshutdown_cmd[] = {
    "/usr/bin/sys-suspend",
    "-n", "-d", ":0", NULL
};

static char *power_button_cmd[] = {
    "/usr/bin/sys-suspend",
    "-h", "-d", ":0", NULL
};

#ifdef __x86
static char *autoS3_cmd[] = {
    "/usr/bin/sys-suspend",
    "-n", "-d", ":0", NULL
};
#endif

static char pidpath[] = PIDPATH;
static char scratch[PATH_MAX];
static char *prog;

/* Local Functions */
static void alarm_handler(int);
static void thaw_handler(int);
static void kill_handler(int);
static void work_handler(int);
static void check_shutdown(time_t *, hrtime_t *);
static void check_idleness(time_t *, hrtime_t *);
static int last_system_activity(hrtime_t *);
static int run_idlecheck(void);
static void set_alarm(time_t);
static int poweroff(const char *, char **);
static int is_ok2shutdown(time_t *);
static int get_prom(int, prom_node_t, char *, char *, size_t);
static void power_button_monitor(void *);
static int open_pidfile(char *);
static int write_pidfile(int, pid_t);
static int read_cpr_config(void);
static void system_activity_monitor(void);
#ifdef __x86
static void autos3_monitor(void);
#endif
static void do_attach(void);
static void *attach_devices(void *);
static int powerd_debug;

/* PRINTFLIKE1 */
static void
logerror(const char *fmt, ...)
{
    va_list args;

    va_start(args, fmt);
    if (broadcast)
        vsyslog(LOG_ERR, fmt, args);
    va_end(args);
}


static void
estrcpy(char *dst, char *src, size_t dlen)
{
    size_t slen;

    slen = strlcpy(dst, src, dlen);
    if (slen >= dlen) {
        logerror("%s: string too long \"%s ...\"\n"
            "(len %d, max %d)\n", prog, dst, slen, dlen - 1);
        exit(EXIT_FAILURE);
    }
}


int
main(int argc, char *argv[])
{
    pid_t       pid;
    int     pm_fd;
    struct sigaction act;
    sigset_t    sigmask;
    int     c;
    char        errmsg[PATH_MAX + 64];
    int     pid_fd;

    prog = argv[0];
    if (geteuid() != 0) {
        (void) fprintf(stderr, "%s: Must be root\n", prog);
        exit(EXIT_FAILURE);
    }

    if ((pid_fd = open_pidfile(prog)) ==  -1)
        exit(EXIT_FAILURE);

    /*
     * Process options
     */
    broadcast = 1;
    while ((c = getopt(argc, argv, "nd")) != EOF) {
        switch (c) {
        case 'd':
            powerd_debug = 1;
            break;
        case 'n':
            broadcast = 0;
            break;
        case '?':
            (void) fprintf(stderr, "Usage: %s [-n]\n", prog);
            exit(EXIT_FAILURE);
        }
    }

    pm_fd = open(PM, O_RDWR);
    if (pm_fd == -1) {
        (void) snprintf(errmsg, sizeof (errmsg), "%s: %s", prog, PM);
        perror(errmsg);
        exit(EXIT_FAILURE);
    }
    (void) close(pm_fd);

    /*
     * Initialize mutex lock used to insure only one command to
     * run at a time.
     */
    if (mutex_init(&poweroff_mutex, USYNC_THREAD, NULL) != 0) {
        (void) fprintf(stderr,
            "%s: Unable to initialize mutex lock\n", prog);
        exit(EXIT_FAILURE);
    }

    if ((info = (pwr_info_t *)malloc(sizeof (pwr_info_t))) == NULL) {
        (void) snprintf(errmsg, sizeof (errmsg), "%s: malloc", prog);
        perror(errmsg);
        exit(EXIT_FAILURE);
    }

    /*
     * Daemon is set to go...
     */
    if ((pid = fork()) < 0)
        exit(EXIT_FAILURE);
    else if (pid != 0)
        exit(EXIT_SUCCESS);

    pid = getpid();
    openlog(prog, 0, LOG_DAEMON);
    if (write_pidfile(pid_fd, pid) == -1)   /* logs errors on failure */
        exit(EXIT_FAILURE);
    (void) close(pid_fd);

    /*
     * Close all the parent's file descriptors (Bug 1225843).
     */
    closefrom(0);
    (void) setsid();
    (void) chdir("/");
    (void) umask(0);
#ifdef DEBUG
    /*
     * Connect stdout to the console.
     */
    if (dup2(open("/dev/console", O_WRONLY|O_NOCTTY), 1) == -1) {
        logerror("Unable to connect to the console.");
    }
#endif
    info->pd_flags = PD_AC;
    info->pd_idle_time = -1;
    info->pd_start_time = 0;
    info->pd_finish_time = 0;

    /*
     * Allow SIGQUIT, SIGINT and SIGTERM signals to terminate us
     * any time
     */
    act.sa_handler = kill_handler;
    (void) sigemptyset(&act.sa_mask);
    act.sa_flags = 0;
    (void) sigaction(SIGQUIT, &act, NULL);
    (void) sigaction(SIGINT, &act, NULL);
    (void) sigaction(SIGTERM, &act, NULL);

    (void) sigfillset(&sigmask);
    (void) sigdelset(&sigmask, SIGQUIT);
    (void) sigdelset(&sigmask, SIGINT);
    (void) sigdelset(&sigmask, SIGTERM);
    (void) thr_sigsetmask(SIG_SETMASK, &sigmask, NULL);

    /*
     * If "power_button" device node can be opened, create a new
     * thread to monitor the power button.
     */
    if ((pb_fd = open(PB, O_RDONLY)) != -1) {
        if (powerd_debug)
            logerror("powerd starting power button monitor.");
        if (thr_create(NULL, NULL,
            (void *(*)(void *))power_button_monitor, NULL,
            THR_DAEMON, NULL) != 0) {
            logerror("Unable to monitor system's power button.");
        }
    }

    do_attach();

    /*
     * Create a new thread to monitor system activity and suspend
     * system if idle.
     */
    if (powerd_debug)
        logerror("powerd starting system activity monitor.");
    if (thr_create(NULL, NULL,
        (void *(*)(void *))system_activity_monitor, NULL,
        THR_DAEMON, NULL) != 0) {
        logerror("Unable to create thread to monitor system activity.");
    }

#ifdef __x86
    /*
     * Create a new thread to handle autos3 trigger
     */
    if (powerd_debug)
        logerror("powerd starting autos3 monitor.");
    if (thr_create(NULL, NULL,
        (void *(*)(void *))autos3_monitor, NULL, THR_DAEMON, NULL) != 0) {
        logerror("Unable to create thread to monitor autos3 activity.");
    }
#endif

    /*
     * Block until we receive an explicit terminate signal
     */
    (void) sigsuspend(&sigmask);

    return (1);
}

static void
system_activity_monitor(void)
{
    struct sigaction act;
    sigset_t sigmask;

    /*
     * Setup for gathering system's statistic.
     */
    sysstat_init();

    /*
     * In addition to the SIGQUIT, SIGINT and SIGTERM signals already
     * being handled, this thread also needs to handle SIGHUP, SIGALRM
     * and SIGTHAW signals.
     */
    (void) sigemptyset(&act.sa_mask);
    act.sa_flags = 0;
    act.sa_handler = alarm_handler;
    (void) sigaction(SIGALRM, &act, NULL);
    act.sa_handler = work_handler;
    (void) sigaction(SIGHUP, &act, NULL);
    act.sa_handler = thaw_handler;
    (void) sigaction(SIGTHAW, &act, NULL);

    /*
     * Invoke work_handler with a dummy SIGHUP signal to read
     * cpr config file, get autoshutdown properties and schedule
     * an alarm if needed.
     */
    work_handler(SIGHUP);

    /*
     * Wait for signal to read file
     */
    (void) thr_sigsetmask(0, 0, &sigmask);
    (void) sigdelset(&sigmask, SIGHUP);
    (void) sigdelset(&sigmask, SIGALRM);
    (void) sigdelset(&sigmask, SIGTHAW);
    (void) thr_sigsetmask(SIG_SETMASK, &sigmask, NULL);
    do {
        (void) sigsuspend(&sigmask);
    } while (errno == EINTR);
}

#ifdef __x86
static void
autos3_monitor(void)
{
    struct pollfd poll_fd;
    srn_event_info_t srn_event;     /* contains suspend type */
    int fd, ret;

    fd = open(SRN, O_RDWR|O_EXCL|O_NDELAY);
    if (fd == -1) {
        logerror("Unable to open %s: %s", SRN, strerror(errno));
        thr_exit((void *)(intptr_t)errno);
    }

    /*
     * Tell device we want the special sauce
     */
    ret = ioctl(fd, SRN_IOC_AUTOSX, NULL);
    if (ret == -1) {
        logerror("Ioctl SRN_IOC_AUTOSX failed: %s", strerror(errno));
        (void) close(fd);
        thr_exit((void *)(intptr_t)errno);
    }
    poll_fd.fd = fd;
    /*CONSTCOND*/
    while (1) {
        poll_fd.revents = 0;
        poll_fd.events = POLLIN;
        if (poll(&poll_fd, 1, -1) < 0) {
            switch (errno) {
            case EINTR:
            case EAGAIN:
                continue;
            default:
                logerror("Poll error: %s", strerror(errno));
                (void) close(fd);
                thr_exit((void *)(intptr_t)errno);
            }
        }

        ret = ioctl(fd, SRN_IOC_NEXTEVENT, &srn_event);
        if (ret == -1) {
            logerror("ioctl error: %s", strerror(errno));
            (void) close(fd);
            thr_exit((void *)(intptr_t)errno);
        }
        switch (srn_event.ae_type) {
        case 3:         /* S3 */
            if (powerd_debug)
                logerror("ioctl returns type: %d",
                    srn_event.ae_type);
            break;
        default:
            logerror("Unsupported target state %d",
                srn_event.ae_type);
            continue;
        }
        (void) poweroff("AutoS3", autoS3_cmd);
        continue;
    }
}
#endif

static int
read_cpr_config(void)
{
    int asfd;

    if ((asfd = open(CPR_CONFIG, O_RDONLY)) < 0) {
        logerror("Unable to open CPR config file '%s'", CPR_CONFIG);
        return (-1);
    }

    if (read(asfd, (void *)&asinfo, sizeof (asinfo)) != sizeof (asinfo)) {
        logerror("Unable to read CPR config file '%s'", CPR_CONFIG);
        (void) close(asfd);
        return (-1);
    }

    (void) close(asfd);

    return (0);
}

/*ARGSUSED*/
static void
thaw_handler(int sig)
{
    start_calc  = 0;
    last_resume = time(NULL);
}

/*ARGSUSED*/
static void
kill_handler(int sig)
{
    int ret_code = EXIT_SUCCESS;

    /*
     * Free resources
     */

    free(info);
    if (pb_fd != -1) {
        (void) close(pb_fd);
    }
    (void) mutex_destroy(&poweroff_mutex);
    (void) unlink(pidpath);
    closelog();
    exit(ret_code);
}

/*ARGSUSED*/
static void
alarm_handler(int sig)
{
    time_t      now;
    hrtime_t    hr_now;

    now = time(NULL);
    hr_now = gethrtime();
    if (checkidle_time <= now && checkidle_time != 0)
        check_idleness(&now, &hr_now);
    if (shutdown_time <= now && shutdown_time != 0)
        check_shutdown(&now, &hr_now);

    set_alarm(now);
}

/*ARGSUSED*/
static void
work_handler(int sig)
{
    time_t      now;
    hrtime_t    hr_now;
    struct stat stat_buf;

    do_idlecheck = 0;
    info->pd_flags = PD_AC;

    /*
     * Parse the config file for autoshutdown and idleness entries.
     */
    if (read_cpr_config() < 0)
        return;

    /*
     * Since Oct. 1, 1995, any new system shipped had root
     * property "energystar-v2" defined in its prom.  Systems
     * shipped after July 1, 1999, will have "energystar-v3"
     * property.
     */
    estar_v2_prop = asinfo.is_cpr_default;

    info->pd_flags |= asinfo.is_autowakeup_capable;

    if (strlen(asinfo.idlecheck_path) > 0) {
        if (stat(asinfo.idlecheck_path, &stat_buf) != 0) {
            logerror("unable to access idlecheck program \"%s\".",
                asinfo.idlecheck_path);
        } else if (!(stat_buf.st_mode & S_IXUSR)) {
            logerror("idlecheck program \"%s\" is not executable.",
                asinfo.idlecheck_path);
        } else {
            do_idlecheck = 1;
        }
    }

    if (strlen(asinfo.as_behavior) == 0 ||
        strcmp(asinfo.as_behavior, "noshutdown") == 0 ||
        strcmp(asinfo.as_behavior, "unconfigured") == 0) {
        info->pd_autoshutdown = 0;
    } else if (strcmp(asinfo.as_behavior, "default") == 0) {
        info->pd_autoshutdown = estar_v2_prop;
    } else if (strcmp(asinfo.as_behavior, "shutdown") == 0 ||
        strcmp(asinfo.as_behavior, "autowakeup") == 0) {
        info->pd_autoshutdown = asinfo.is_cpr_capable;
    } else {
        logerror("autoshutdown behavior \"%s\" unrecognized.",
            asinfo.as_behavior);
        info->pd_autoshutdown = 0;
    }

    if (info->pd_autoshutdown) {
        info->pd_idle_time = asinfo.as_idle;
        info->pd_start_time =
            (asinfo.as_sh * 60 + asinfo.as_sm) % DAYS_TO_MINS;
        info->pd_finish_time =
            (asinfo.as_fh * 60 + asinfo.as_fm) % DAYS_TO_MINS;
        info->pd_autoresume =
            (strcmp(asinfo.as_behavior, "autowakeup") == 0) ? 1 : 0;
    }
    autoshutdown_en = (asinfo.as_idle >= 0 && info->pd_autoshutdown)
        ? 1 : 0;

#ifdef DEBUG
    (void) fprintf(stderr, "autoshutdown_en = %d, as_idle = %d, "
        "pd_autoresume = %d\n",
        autoshutdown_en, asinfo.as_idle, info->pd_autoresume);

    (void) fprintf(stderr, " pd_start_time=%d, pd_finish_time=%d\n",
        info->pd_start_time, info->pd_finish_time);
#endif

    got_sighup = 1;
    now = last_resume = time(NULL);
    hr_now = gethrtime();
    check_idleness(&now, &hr_now);
    check_shutdown(&now, &hr_now);
    set_alarm(now);
}

static void
check_shutdown(time_t *now, hrtime_t *hr_now)
{
    int     tod_fd = -1;
    int     kbd, mouse, system, least_idle, idlecheck_time;
    int     next_time;
    int     s, f;
    struct tm   tmp_time;
    time_t      start_of_day, time_since_last_resume;
    time_t      wakeup_time;
    extern long conskbd_idle_time(void);
    extern long consms_idle_time(void);
    static int  warned_kbd, warned_ms; /* print error msg one time */

    if (!autoshutdown_en) {
        shutdown_time = 0;
        return;
    }

    (void) localtime_r(now, &tmp_time);
    tmp_time.tm_sec = 0;
    tmp_time.tm_min = 0;
    tmp_time.tm_hour = 0;
    start_of_day = mktime(&tmp_time);
    s = start_of_day + info->pd_start_time * 60;
    f = start_of_day + info->pd_finish_time * 60;
    if ((s < f && *now >= s && *now < f) ||
        (s >= f && (*now < f || *now >= s))) {
        if ((mouse = (int)consms_idle_time()) < 0) {
            if (! warned_ms) {
                warned_ms = 1;
                logerror("powerd: failed to get "
                    "idle time for console mouse");
            }
            return;
        }
        if ((kbd = (int)conskbd_idle_time()) < 0) {
            if (! warned_kbd) {
                warned_kbd = 1;
                logerror("powerd: failed to get "
                    "idle time for console keyboard");
            }
            return;
        }

        system = last_system_activity(hr_now);
        /* who is the last to go idle */
        least_idle = MIN(system, MIN(kbd, mouse));

        /*
         * Calculate time_since_last_resume and the next_time
         * to auto suspend.
         */
        start_calc = 1;
        time_since_last_resume = time(NULL) - last_resume;
        next_time = info->pd_idle_time * 60 -
            MIN(least_idle, time_since_last_resume);

#ifdef DEBUG
        fprintf(stderr, " check_shutdown: next_time=%d\n", next_time);
#endif

        /*
         * If we have get the SIGTHAW signal at this point - our
         * calculation of time_since_last_resume is wrong  so
         * - we need to recalculate.
         */
        while (start_calc == 0) {
            /* need to redo calculation */
            start_calc = 1;
            time_since_last_resume = time(NULL) - last_resume;
            next_time = info->pd_idle_time * 60 -
                MIN(least_idle, time_since_last_resume);
        }

        /*
         * Only when everything else is idle, run the user's idlecheck
         * script.
         */
        if (next_time <= 0 && do_idlecheck) {
            got_sighup = 0;
            idlecheck_time = run_idlecheck();
            next_time = info->pd_idle_time * 60 -
                MIN(idlecheck_time, MIN(least_idle,
                time_since_last_resume));
            /*
             * If we have caught SIGTHAW or SIGHUP, need to
             * recalculate.
             */
            while (start_calc == 0 || got_sighup == 1) {
                start_calc = 1;
                got_sighup = 0;
                idlecheck_time = run_idlecheck();
                time_since_last_resume = time(NULL) -
                    last_resume;
                next_time = info->pd_idle_time * 60 -
                    MIN(idlecheck_time, MIN(least_idle,
                    time_since_last_resume));
            }
        }

        if (next_time <= 0) {
            if (is_ok2shutdown(now)) {
                /*
                 * Setup the autowakeup alarm.  Clear it
                 * right after poweroff, just in case if
                 * shutdown doesn't go through.
                 */
                if (info->pd_autoresume)
                    tod_fd = open(TOD, O_RDWR);
                if (info->pd_autoresume && tod_fd != -1) {
                    wakeup_time = (*now < f) ? f :
                        (f + DAYS_TO_SECS);
                    /*
                     * A software fix for hardware
                     * bug 1217415.
                     */
                    if ((wakeup_time - *now) < 180) {
                        logerror(
        "Since autowakeup time is less than 3 minutes away, "
        "autoshutdown will not occur.");
                        shutdown_time = *now + 180;
                        (void) close(tod_fd);
                        return;
                    }
                    if (ioctl(tod_fd, TOD_SET_ALARM,
                        &wakeup_time) == -1) {
                        logerror("Unable to program TOD"
                            " alarm for autowakeup.");
                        (void) close(tod_fd);
                        return;
                    }
                }

                (void) poweroff("Autoshutdown",
                    autoshutdown_cmd);

                if (info->pd_autoresume && tod_fd != -1) {
                    if (ioctl(tod_fd, TOD_CLEAR_ALARM,
                        NULL) == -1)
                        logerror("Unable to clear "
                            "alarm in TOD device.");
                    (void) close(tod_fd);
                }

                (void) time(now);
                /* wait at least 5 mins */
                shutdown_time = *now +
                    ((info->pd_idle_time * 60) > 300 ?
                    (info->pd_idle_time * 60) : 300);
            } else {
                /* wait 5 mins */
                shutdown_time = *now + 300;
            }
        } else
            shutdown_time = *now + next_time;
    } else if (s < f && *now >= f) {
        shutdown_time = s + DAYS_TO_SECS;
    } else
        shutdown_time = s;
}

static int
is_ok2shutdown(time_t *now)
{
    int prom_fd = -1;
    char    power_cycles_st[LLEN];
    char    power_cycle_limit_st[LLEN];
    char    system_board_date_st[LLEN];
    int power_cycles, power_cycle_limit, free_cycles, scaled_cycles;
    time_t  life_began, life_passed;
    int no_power_cycles = 0;
    int no_system_board_date = 0;
    int ret = 1;

    /* CONSTCOND */
    while (1) {
        if ((prom_fd = open(PROM, O_RDWR)) == -1 &&
            (errno == EAGAIN))
            continue;
        break;
    }

    /*
     * when #power-cycles property does not exist
     * power cycles are unlimited.
     */
    if (get_prom(prom_fd, options, "#power-cycles",
        power_cycles_st, sizeof (power_cycles_st)) == 0)
        goto ckdone;

    if (get_prom(prom_fd, root, "power-cycle-limit",
        power_cycle_limit_st, sizeof (power_cycle_limit_st)) == 0) {
        power_cycle_limit = DEFAULT_POWER_CYCLE_LIMIT;
    } else {
        power_cycle_limit = atoi(power_cycle_limit_st);
    }

    /*
     * Allow 10% of power_cycle_limit as free cycles.
     */
    free_cycles = power_cycle_limit / 10;

    power_cycles = atoi(power_cycles_st);
    if (power_cycles < 0)
        no_power_cycles++;
    else if (power_cycles <= free_cycles)
        goto ckdone;

    if (no_power_cycles && log_power_cycles_error == 0) {
        logerror("Invalid PROM property \"#power-cycles\" was found.");
        log_power_cycles_error++;
    }

    if (get_prom(prom_fd, options, "system-board-date",
        system_board_date_st, sizeof (system_board_date_st)) == 0) {
        no_system_board_date++;
    } else {
        life_began = strtol(system_board_date_st, (char **)NULL, 16);
        if (life_began > *now) {
            no_system_board_date++;
        }
    }
    if (no_system_board_date) {
        if (log_system_board_date_error == 0) {
            logerror("No or invalid PROM property "
                "\"system-board-date\" was found.");
            log_system_board_date_error++;
        }
        life_began = DEFAULT_SYSTEM_BOARD_DATE;
    }

    life_passed = *now - life_began;

    /*
     * Since we don't keep the date that last free_cycle is ended, we
     * need to spread (power_cycle_limit - free_cycles) over the entire
     * 7-year life span instead of (lifetime - date free_cycles ended).
     */
    scaled_cycles = (int)(((float)life_passed / (float)LIFETIME_SECS) *
        (power_cycle_limit - free_cycles));

    if (no_power_cycles)
        goto ckdone;

#ifdef DEBUG
    (void) fprintf(stderr, "Actual power_cycles = %d\t"
        "Scaled power_cycles = %d\n", power_cycles, scaled_cycles);
#endif
    if (power_cycles > scaled_cycles) {
        if (log_no_autoshutdown_warning == 0) {
            logerror("Automatic shutdown has been temporarily "
                "suspended in order to preserve the reliability "
                "of this system.");
            log_no_autoshutdown_warning++;
        }
        ret = 0;
        goto ckdone;
    }

ckdone:
    if (prom_fd != -1)
        (void) close(prom_fd);
    return (ret);
}

static void
check_idleness(time_t *now, hrtime_t *hr_now)
{

    /*
     * Check idleness only when autoshutdown is enabled.
     */
    if (!autoshutdown_en) {
        checkidle_time = 0;
        return;
    }

    info->pd_ttychars_idle = check_tty(hr_now, asinfo.ttychars_thold);
    info->pd_loadaverage_idle =
        check_load_ave(hr_now, asinfo.loadaverage_thold);
    info->pd_diskreads_idle = check_disks(hr_now, asinfo.diskreads_thold);
    info->pd_nfsreqs_idle = check_nfs(hr_now, asinfo.nfsreqs_thold);

#ifdef DEBUG
    (void) fprintf(stderr, "Idle ttychars for %d secs.\n",
        info->pd_ttychars_idle);
    (void) fprintf(stderr, "Idle loadaverage for %d secs.\n",
        info->pd_loadaverage_idle);
    (void) fprintf(stderr, "Idle diskreads for %d secs.\n",
        info->pd_diskreads_idle);
    (void) fprintf(stderr, "Idle nfsreqs for %d secs.\n",
        info->pd_nfsreqs_idle);
#endif

    checkidle_time = *now + IDLECHK_INTERVAL;
}

static int
last_system_activity(hrtime_t *hr_now)
{
    int act_idle, latest;

    latest = info->pd_idle_time * 60;
    act_idle = last_tty_activity(hr_now, asinfo.ttychars_thold);
    latest = MIN(latest, act_idle);
    act_idle = last_load_ave_activity(hr_now);
    latest = MIN(latest, act_idle);
    act_idle = last_disk_activity(hr_now, asinfo.diskreads_thold);
    latest = MIN(latest, act_idle);
    act_idle = last_nfs_activity(hr_now, asinfo.nfsreqs_thold);
    latest = MIN(latest, act_idle);

    return (latest);
}

static int
run_idlecheck()
{
    char        pm_variable[LLEN];
    char        *cp;
    int     status;
    pid_t       child;

    /*
     * Reap any child process which has been left over.
     */
    while (waitpid((pid_t)-1, &status, WNOHANG) > 0)
        ;

    /*
     * Execute the user's idlecheck script and set variable PM_IDLETIME.
     * Returned exit value is the idle time in minutes.
     */
    if ((child = fork1()) == 0) {
        (void) sprintf(pm_variable, "PM_IDLETIME=%d",
            info->pd_idle_time);
        (void) putenv(pm_variable);
        cp = strrchr(asinfo.idlecheck_path, '/');
        if (cp == NULL)
            cp = asinfo.idlecheck_path;
        else
            cp++;
        (void) execl(asinfo.idlecheck_path, cp, NULL);
        exit(-1);
    } else if (child == -1) {
        return (info->pd_idle_time * 60);
    }

    /*
     * Wait until the idlecheck program completes.
     */
    if (waitpid(child, &status, 0) != child) {
        /*
         * We get here if the calling process gets a signal.
         */
        return (info->pd_idle_time * 60);
    }

    if (WEXITSTATUS(status) < 0) {
        return (info->pd_idle_time * 60);
    } else {
        return (WEXITSTATUS(status) * 60);
    }
}

static void
set_alarm(time_t now)
{
    time_t  itime, stime, next_time, max_time;
    int next_alarm;

    max_time = MAX(checkidle_time, shutdown_time);
    if (max_time == 0) {
        (void) alarm(0);
        return;
    }
    itime = (checkidle_time == 0) ? max_time : checkidle_time;
    stime = (shutdown_time == 0) ? max_time : shutdown_time;
    next_time = MIN(itime, stime);
    next_alarm = (next_time <= now) ? 1 : (next_time - now);
    (void) alarm(next_alarm);

#ifdef DEBUG
    (void) fprintf(stderr, "Currently @ %s", ctime(&now));
    (void) fprintf(stderr, "Checkidle in %d secs\n", checkidle_time - now);
    (void) fprintf(stderr, "Shutdown  in %d secs\n", shutdown_time - now);
    (void) fprintf(stderr, "Next alarm goes off in %d secs\n", next_alarm);
    (void) fprintf(stderr, "************************************\n");
#endif
}

static int
poweroff(const char *msg, char **cmd_argv)
{
    struct stat statbuf;
    pid_t       pid, child;
    struct passwd   *pwd;
    char        *home, *user;
    char        ehome[] = "HOME=";
    char        euser[] = "LOGNAME=";
    int     status;
    char        **ca;

    if (mutex_trylock(&poweroff_mutex) != 0)
        return (0);

    if (stat("/dev/console", &statbuf) == -1 ||
        (pwd = getpwuid(statbuf.st_uid)) == NULL) {
        (void) mutex_unlock(&poweroff_mutex);
        return (1);
    }

    if (msg)
        syslog(LOG_NOTICE, msg);

    if (*cmd_argv == NULL) {
        logerror("No command to run.");
        (void) mutex_unlock(&poweroff_mutex);
        return (1);
    }

    home = malloc(strlen(pwd->pw_dir) + sizeof (ehome));
    user = malloc(strlen(pwd->pw_name) + sizeof (euser));
    if (home == NULL || user == NULL) {
        free(home);
        free(user);
        logerror("No memory.");
        (void) mutex_unlock(&poweroff_mutex);
        return (1);
    }
    (void) strcpy(home, ehome);
    (void) strcat(home, pwd->pw_dir);
    (void) strcpy(user, euser);
    (void) strcat(user, pwd->pw_name);

    /*
     * Need to simulate the user enviroment, minimaly set HOME, and USER.
     */
    if ((child = fork1()) == 0) {
        (void) putenv(home);
        (void) putenv(user);
        (void) setgid(pwd->pw_gid);
        (void) setuid(pwd->pw_uid);

        /*
         * check for shutdown flag and set environment
         */
        for (ca = cmd_argv; *ca; ca++) {
            if (strcmp("-h", *ca) == 0) {
                (void) putenv("SYSSUSPENDDODEFAULT=");
                break;
            }
        }

        (void) execv(cmd_argv[0], cmd_argv);
        exit(EXIT_FAILURE);
    } else {
        free(home);
        free(user);
        if (child == -1) {
            (void) mutex_unlock(&poweroff_mutex);
            return (1);
        }
    }
    pid = 0;
    while (pid != child)
        pid = wait(&status);
    if (WEXITSTATUS(status)) {
        (void) syslog(LOG_ERR, "Failed to exec \"%s\".", cmd_argv[0]);
        (void) mutex_unlock(&poweroff_mutex);
        return (1);
    }

    (void) mutex_unlock(&poweroff_mutex);
    return (0);
}

#define PBUFSIZE    256

/*
 * Gets the value of a prom property at either root or options node.  It
 * returns 1 if it is successful, otherwise it returns 0 .
 */
static int
get_prom(int prom_fd, prom_node_t node_name,
    char *property_name, char *property_value, size_t len)
{
    union {
        char buf[PBUFSIZE + sizeof (uint_t)];
        struct openpromio opp;
    } oppbuf;
    register struct openpromio *opp = &(oppbuf.opp);
    int got_it = 0;

    if (prom_fd == -1) {
        return (0);
    }

    switch (node_name) {
    case root:
        (void *) memset(oppbuf.buf, 0, PBUFSIZE);
        opp->oprom_size = PBUFSIZE;
        if (ioctl(prom_fd, OPROMNEXT, opp) < 0) {
            return (0);
        }

        /*
         * Passing null string will give us the first property.
         */
        (void *) memset(oppbuf.buf, 0, PBUFSIZE);
        do {
            opp->oprom_size = PBUFSIZE;
            if (ioctl(prom_fd, OPROMNXTPROP, opp) < 0) {
                return (0);
            }
            if (strcmp(opp->oprom_array, property_name) == 0) {
                got_it++;
                break;
            }
        } while (opp->oprom_size > 0);

        if (!got_it) {
            return (0);
        }
        if (got_it && property_value == NULL) {
            return (1);
        }
        opp->oprom_size = PBUFSIZE;
        if (ioctl(prom_fd, OPROMGETPROP, opp) < 0) {
            return (0);
        }
        if (opp->oprom_size == 0) {
            *property_value = '\0';
        } else {
            estrcpy(property_value, opp->oprom_array, len);
        }
        break;
    case options:
        estrcpy(opp->oprom_array, property_name, PBUFSIZE);
        opp->oprom_size = PBUFSIZE;
        if (ioctl(prom_fd, OPROMGETOPT, opp) < 0) {
            return (0);
        }
        if (opp->oprom_size == 0) {
            return (0);
        }
        if (property_value != NULL) {
            estrcpy(property_value, opp->oprom_array, len);
        }
        break;
    default:
        logerror("Only root node and options node are supported.\n");
        return (0);
    }

    return (1);
}

#define isspace(ch) ((ch) == ' ' || (ch) == '\t')
#define iseol(ch)   ((ch) == '\n' || (ch) == '\r' || (ch) == '\f')

/*ARGSUSED*/
static void
power_button_monitor(void *arg)
{
    struct pollfd pfd;
    int events, ret;

    if (ioctl(pb_fd, PB_BEGIN_MONITOR, NULL) == -1) {
        logerror("Failed to monitor the power button.");
        thr_exit((void *) 0);
    }

    pfd.fd = pb_fd;
    pfd.events = POLLIN;

    /*CONSTCOND*/
    while (1) {
        if (poll(&pfd, 1, INFTIM) == -1) {
            logerror("Failed to poll for power button events.");
            thr_exit((void *) 0);
        }

        if (!(pfd.revents & POLLIN))
            continue;

        /*
         * Monitor the power button, but only take action if
         * gnome-power-manager is not running.
         *
         * ret greater than 0 means could not find process.
         */
        ret = system("/usr/bin/pgrep -fx gnome-power-manager");

        if (ioctl(pfd.fd, PB_GET_EVENTS, &events) == -1) {
            logerror("Failed to get power button events.");
            thr_exit((void *) 0);
        }

        if ((ret > 0) && (events & PB_BUTTON_PRESS) &&
            (poweroff(NULL, power_button_cmd) != 0)) {
            logerror("Power button is pressed, powering "
                "down the system!");

            /*
             * Send SIGPWR signal to the init process to
             * shut down the system.
             */
            if (kill(1, SIGPWR) == -1)
                (void) uadmin(A_SHUTDOWN, AD_POWEROFF, 0);
        }

        /*
         * Clear any power button event that has happened
         * meanwhile we were busy processing the last one.
         */
        if (ioctl(pfd.fd, PB_GET_EVENTS, &events) == -1) {
            logerror("Failed to get power button events.");
            thr_exit((void *) 0);
        }
    }
}

static void
do_attach(void)
{
    if (read_cpr_config() < 0)
        return;

    /*
     * If autopm behavior is explicitly enabled for energystar-v2, or
     * set to default for energystar-v3, create a new thread to attach
     * all devices.
     */
    estar_v3_prop = asinfo.is_autopm_default;
    if ((strcmp(asinfo.apm_behavior, "enable") == 0) ||
        (estar_v3_prop && strcmp(asinfo.apm_behavior, "default") == 0)) {
        if (powerd_debug)
            logerror("powerd starting device attach thread.");
        if (thr_create(NULL, NULL, attach_devices, NULL,
            THR_DAEMON, NULL) != 0) {
            logerror("Unable to create thread to attach devices.");
        }
    }
}

/*ARGSUSED*/
static void *
attach_devices(void *arg)
{
    di_node_t root_node;

    (void) sleep(60);   /* let booting finish first */

    if ((root_node = di_init("/", DINFOFORCE)) == DI_NODE_NIL) {
        logerror("Failed to attach devices.");
        return (NULL);
    }
    di_fini(root_node);

    /*
     * Unload all the modules.
     */
    (void) modctl(MODUNLOAD, 0);

    return (NULL);
}


/*
 * Create a file which will contain our pid.  Pmconfig will check this file
 * to see if we are running and can use the pid to signal us.  Returns the
 * file descriptor if successful, -1 otherwise.
 *
 * Note: Deal with attempt to launch multiple instances and also with existence
 * of an obsolete pid file caused by an earlier abort.
 */
static int
open_pidfile(char *me)
{
    int fd;
    const char *e1 = "%s: Cannot open pid file for read: ";
    const char *e2 = "%s: Cannot unlink obsolete pid file: ";
    const char *e3 = "%s: Either another daemon is running or the"
        " process is defunct (pid %d). \n";
    const char *e4 = "%s: Cannot create pid file: ";

again:
    if ((fd = open(pidpath, O_CREAT | O_EXCL | O_WRONLY, 0444)) == -1) {
        if (errno  == EEXIST) {
            FILE *fp;
            pid_t pid;

            if ((fp = fopen(pidpath, "r")) == NULL) {
                (void) fprintf(stderr, e1, me);
                perror(NULL);
                return (-1);
            }

            /* Read the pid */
            pid = (pid_t)-1;
            (void) fscanf(fp, "%ld", &pid);
            (void) fclose(fp);
            if (pid == -1) {
                if (unlink(pidpath) == -1) {
                    (void) fprintf(stderr, e2, me);
                    perror(NULL);
                    return (-1);
                } else /* try without corrupted file */
                    goto again;
            }

            /* Is pid for a running process */
            if (kill(pid, 0) == -1) {
                if (errno == ESRCH) {
                    if (unlink(pidpath) == -1) {
                        (void) fprintf(stderr, e2, me);
                        perror(NULL);
                        return (-1);
                    } else  /* try without obsolete file */
                        goto again;
                }
            } else {    /* powerd deamon still running or defunct */
                (void) fprintf(stderr, e3, me, pid);
                return (-1);
            }

        } else {    /* create failure not due to existing file */
            (void) fprintf(stderr, e4, me);
            perror(NULL);
            return (-1);
        }
    }

    (void) fchown(fd, (uid_t)-1, (gid_t)0);
    return (fd);
}

/*
 * Write a pid to the pid file.  Report errors to syslog.
 *
 */
static int
write_pidfile(int fd, pid_t pid)
{
    int len;
    int rc = 0;         /* assume success */

    len = sprintf(scratch, "%ld\n", pid);
    if (write(fd, scratch, len) != len) {
        logerror("Cannot write pid file: %s", strerror(errno));
        rc = -1;
    }

    return (rc);
}