usr.sbin/powerd/powerd.c

   1 /*
   2  * Copyright (c) 2010 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Matthew Dillon <dillon@backplane.com>
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 /*
  36  * The powerd daemon monitors the cpu load and adjusts cpu frequencies
  37  * via hw.acpi.cpu.px_dom*.
  38  */
  39
  40 #define _KERNEL_STRUCTURES
  41 #include <sys/types.h>
  42 #include <sys/sysctl.h>
  43 #include <sys/kinfo.h>
  44 #include <sys/file.h>
  45 #include <sys/queue.h>
  46 #include <sys/soundcard.h>
  47 #include <sys/time.h>
  48 #include <machine/cpufunc.h>
  49 #include <err.h>
  50 #include <stdio.h>
  51 #include <stdlib.h>
  52 #include <unistd.h>
  53 #include <string.h>
  54 #include <syslog.h>
  55
  56 #include "alert1.h"
  57
  58 #define MAXDOM          MAXCPU  /* worst case, 1 cpu per domain */
  59
  60 #define MAXFREQ         64
  61
  62 struct cpu_pwrdom {
  63         TAILQ_ENTRY(cpu_pwrdom) dom_link;
  64         int                     dom_id;
  65         int                     dom_ncpus;
  66         cpumask_t               dom_cpumask;
  67 };
  68 TAILQ_HEAD(cpu_pwrdom_list, cpu_pwrdom);
  69
  70 static void usage(void);
  71 static double getcputime(double);
  72 static void acpi_setcpufreq(int nstate);
  73 static int setupdominfo(void);
  74 static int has_battery(void);
  75 static int mon_battery(void);
  76 static void getncpus(void);
  77
  78 static struct cpu_pwrdom_list CpuPwrDomain;
  79 static struct cpu_pwrdom *CpuPwrDomLimit;
  80 static struct cpu_pwrdom CpuPwrDomLast;
  81 static int NCpuPwrDomUsed;
  82
  83 static int TotalCpus;
  84 int DebugOpt;
  85 int TurboOpt = 1;
  86 int CpuLimit;           /* # of cpus at max frequency */
  87 int PowerFd;
  88 int NCpus;
  89 int CpuCount[MAXDOM];   /* # of cpus in any given domain */
  90 int Hysteresis = 10;    /* percentage */
  91 double TriggerUp = 0.25;/* single-cpu load to force max freq */
  92 double TriggerDown; /* load per cpu to force the min freq */
  93 static int BatLifeMin = 2; /* shutdown the box, if low on battery life */
  94 static struct timespec BatLifePrevT;
  95 static int BatLifePollIntvl = 5; /* unit: sec */
  96
  97 static struct timespec BatShutdownStartT;
  98 static int BatShutdownLinger = -1;
  99 static int BatShutdownLingerSet = 60; /* unit: sec */
 100 static int BatShutdownLingerCnt;
 101 static int BatShutdownAudioAlert = 1;
 102
 103 static void sigintr(int signo);
 104
 105 int
 106 main(int ac, char **av)
 107 {
 108         double qavg;
 109         double uavg;    /* uavg - used for speeding up */
 110         double davg;    /* davg - used for slowing down */
 111         double srt;
 112         double pollrate;
 113         int ch;
 114         int ustate;
 115         int dstate;
 116         int nstate;
 117         char buf[64];
 118         int monbat;
 119
 120         srt = 8.0;      /* time for samples - 8 seconds */
 121         pollrate = 1.0; /* polling rate in seconds */
 122
 123         while ((ch = getopt(ac, av, "dp:r:tu:B:L:P:QT:")) != -1) {
 124                 switch(ch) {
 125                 case 'd':
 126                         DebugOpt = 1;
 127                         break;
 128                 case 'p':
 129                         Hysteresis = (int)strtol(optarg, NULL, 10);
 130                         break;
 131                 case 'r':
 132                         pollrate = strtod(optarg, NULL);
 133                         break;
 134                 case 't':
 135                         TurboOpt = 0;
 136                         break;
 137                 case 'u':
 138                         TriggerUp = (double)strtol(optarg, NULL, 10) / 100;
 139                         break;
 140                 case 'B':
 141                         BatLifeMin = strtol(optarg, NULL, 10);
 142                         break;
 143                 case 'L':
 144                         BatShutdownLingerSet = strtol(optarg, NULL, 10);
 145                         if (BatShutdownLingerSet < 0)
 146                                 BatShutdownLingerSet = 0;
 147                         break;
 148                 case 'P':
 149                         BatLifePollIntvl = strtol(optarg, NULL, 10);
 150                         break;
 151                 case 'Q':
 152                         BatShutdownAudioAlert = 0;
 153                         break;
 154                 case 'T':
 155                         srt = strtod(optarg, NULL);
 156                         break;
 157                 default:
 158                         usage();
 159                         /* NOT REACHED */
 160                 }
 161         }
 162         ac -= optind;
 163         av += optind;
 164
 165         /* Get the number of cpus */
 166         getncpus();
 167
 168         if (0 > Hysteresis || Hysteresis > 99) {
 169                 fprintf(stderr, "Invalid hysteresis value\n");
 170                 exit(1);
 171         }
 172
 173         if (0 > TriggerUp || TriggerUp > 1) {
 174                 fprintf(stderr, "Invalid load limit value\n");
 175                 exit(1);
 176         }
 177
 178         TriggerDown = TriggerUp - (TriggerUp * (double) Hysteresis / 100);
 179
 180         /*
 181          * Make sure powerd is not already running.
 182          */
 183         PowerFd = open("/var/run/powerd.pid", O_CREAT|O_RDWR, 0644);
 184         if (PowerFd < 0) {
 185                 fprintf(stderr,
 186                         "Cannot create /var/run/powerd.pid, "
 187                         "continuing anyway\n");
 188         } else {
 189                 if (flock(PowerFd, LOCK_EX|LOCK_NB) < 0) {
 190                         fprintf(stderr, "powerd is already running\n");
 191                         exit(1);
 192                 }
 193         }
 194
 195         /*
 196          * Demonize and set pid
 197          */
 198         if (DebugOpt == 0) {
 199                 daemon(0, 0);
 200                 openlog("powerd", LOG_CONS | LOG_PID, LOG_DAEMON);
 201         }
 202
 203         if (PowerFd >= 0) {
 204                 ftruncate(PowerFd, 0);
 205                 snprintf(buf, sizeof(buf), "%d\n", (int)getpid());
 206                 write(PowerFd, buf, strlen(buf));
 207         }
 208
 209         /* Do we need to monitor battery life? */
 210         if (BatLifePollIntvl <= 0)
 211                 monbat = 0;
 212         else
 213                 monbat = has_battery();
 214
 215         /*
 216          * Wait hw.acpi.cpu.px_dom* sysctl to be created by kernel
 217          *
 218          * Since hw.acpi.cpu.px_dom* creation is queued into ACPI
 219          * taskqueue and ACPI taskqueue is shared across various
 220          * ACPI modules, any delay in other modules may cause
 221          * hw.acpi.cpu.px_dom* to be created at quite a later time
 222          * (e.g. cmbat module's task could take quite a lot of time).
 223          */
 224         for (;;) {
 225                 /*
 226                  * Prime delta cputime calculation, make sure at least
 227                  * dom0 exists.
 228                  */
 229                 getcputime(pollrate);
 230                 if (setupdominfo())
 231                         break;
 232                 usleep((int)(pollrate * 1000000.0));
 233         }
 234
 235         /*
 236          * Assume everything are used and are maxed out, before we
 237          * start.
 238          */
 239         CpuPwrDomLimit = &CpuPwrDomLast;
 240         CpuLimit = NCpus;
 241
 242         /*
 243          * Set to maximum performance if killed.
 244          */
 245         signal(SIGINT, sigintr);
 246         signal(SIGTERM, sigintr);
 247         uavg = 0.0;
 248         davg = 0.0;
 249
 250         srt = srt / pollrate;   /* convert to sample count */
 251
 252         if (DebugOpt)
 253                 printf("samples for downgrading: %5.2f\n", srt);
 254
 255         /*
 256          * Monitoring loop
 257          *
 258          * Calculate nstate, the number of cpus we wish to run at max
 259          * frequency.  All remaining cpus will be set to their lowest
 260          * frequency and mapped out of the user process scheduler.
 261          */
 262         for (;;) {
 263                 qavg = getcputime(pollrate);
 264                 uavg = (uavg * 2.0 + qavg) / 3.0;       /* speeding up */
 265                 davg = (davg * srt + qavg) / (srt + 1); /* slowing down */
 266                 if (davg < uavg)
 267                         davg = uavg;
 268
 269                 ustate = uavg / TriggerUp;
 270                 if (ustate < CpuLimit)
 271                         ustate = uavg / TriggerDown;
 272                 dstate = davg / TriggerUp;
 273                 if (dstate < CpuLimit)
 274                         dstate = davg / TriggerDown;
 275
 276                 nstate = (ustate > dstate) ? ustate : dstate;
 277                 if (nstate > NCpus)
 278                         nstate = NCpus;
 279
 280                 if (DebugOpt) {
 281                         printf("\rqavg=%5.2f uavg=%5.2f davg=%5.2f "
 282                                "%2d/%2d ncpus=%d\r",
 283                                 qavg, uavg, davg,
 284                                 CpuLimit, NCpuPwrDomUsed, nstate);
 285                         fflush(stdout);
 286                 }
 287                 if (nstate != CpuLimit)
 288                         acpi_setcpufreq(nstate);
 289                 if (monbat)
 290                         monbat = mon_battery();
 291                 usleep((int)(pollrate * 1000000.0));
 292         }
 293 }
 294
 295 static
 296 void
 297 sigintr(int signo __unused)
 298 {
 299         syslog(LOG_INFO, "killed, setting max and exiting");
 300         acpi_setcpufreq(NCpus);
 301         exit(1);
 302 }
 303
 304 /*
 305  * Figure out the domains and calculate the CpuCount[] array.
 306  */
 307 static int
 308 setupdominfo(void)
 309 {
 310         struct cpu_pwrdom *dom;
 311         struct cpu_pwrdom_list tmp_list;
 312         char buf[64];
 313         char members[1024];
 314         char *str;
 315         size_t msize;
 316         int n, i;
 317
 318         TAILQ_INIT(&CpuPwrDomain);
 319         NCpuPwrDomUsed = 0;
 320         NCpus = 0;
 321
 322         TAILQ_INIT(&tmp_list);
 323         for (i = 0; i < MAXDOM; ++i) {
 324                 snprintf(buf, sizeof(buf),
 325                          "hw.acpi.cpu.px_dom%d.available", i);
 326                 if (sysctlbyname(buf, NULL, NULL, NULL, 0) < 0)
 327                         continue;
 328
 329                 dom = calloc(1, sizeof(*dom));
 330                 dom->dom_id = i;
 331                 TAILQ_INSERT_TAIL(&tmp_list, dom, dom_link);
 332         }
 333
 334         while ((dom = TAILQ_FIRST(&tmp_list)) != NULL) {
 335                 int bsp_domain = 0;
 336
 337                 TAILQ_REMOVE(&tmp_list, dom, dom_link);
 338                 CPUMASK_ASSZERO(dom->dom_cpumask);
 339
 340                 snprintf(buf, sizeof(buf),
 341                          "hw.acpi.cpu.px_dom%d.members", dom->dom_id);
 342                 msize = sizeof(members);
 343                 if (sysctlbyname(buf, members, &msize, NULL, 0) < 0) {
 344                         free(dom);
 345                         continue;
 346                 }
 347
 348                 members[msize] = 0;
 349                 for (str = strtok(members, " "); str; str = strtok(NULL, " ")) {
 350                         n = -1;
 351                         sscanf(str, "cpu%d", &n);
 352                         if (n >= 0) {
 353                                 ++NCpus;
 354                                 ++dom->dom_ncpus;
 355                                 if (n == 0)
 356                                         bsp_domain = 1;
 357                                 CPUMASK_ORBIT(dom->dom_cpumask, n);
 358                         }
 359                 }
 360                 if (dom->dom_ncpus == 0) {
 361                         free(dom);
 362                         continue;
 363                 }
 364                 if (DebugOpt) {
 365                         printf("dom%d cpumask: ", dom->dom_id);
 366                         for (i = 0; i < (int)NELEM(dom->dom_cpumask.ary); ++i) {
 367                                 printf("%jx ",
 368                                     (uintmax_t)dom->dom_cpumask.ary[i]);
 369                         }
 370                         printf("\n");
 371                         fflush(stdout);
 372                 }
 373
 374                 if (bsp_domain) {
 375                         /*
 376                          * Use the power domain containing the BSP as the first
 377                          * power domain.  So if all CPUs are idle, we could
 378                          * leave BSP to the usched without too much trouble.
 379                          */
 380                         TAILQ_INSERT_HEAD(&CpuPwrDomain, dom, dom_link);
 381                 } else {
 382                         TAILQ_INSERT_TAIL(&CpuPwrDomain, dom, dom_link);
 383                 }
 384                 ++NCpuPwrDomUsed;
 385         }
 386
 387         if (NCpus != TotalCpus) {
 388                 while ((dom = TAILQ_FIRST(&CpuPwrDomain)) != NULL) {
 389                         TAILQ_REMOVE(&CpuPwrDomain, dom, dom_link);
 390                         free(dom);
 391                 }
 392                 if (DebugOpt) {
 393                         printf("Found %d cpus, expecting %d\n",
 394                             NCpus, TotalCpus);
 395                         fflush(stdout);
 396                 }
 397                 return 0;
 398         }
 399
 400         /* Install sentinel */
 401         CpuPwrDomLast.dom_id = -1;
 402         TAILQ_INSERT_TAIL(&CpuPwrDomain, &CpuPwrDomLast, dom_link);
 403
 404         return 1;
 405 }
 406
 407 /*
 408  * Return the one-second cpu load.  One cpu at 100% will return a value
 409  * of 1.0.  On a SMP system N cpus running at 100% will return a value of N.
 410  */
 411 static
 412 double
 413 getcputime(double pollrate)
 414 {
 415         static struct kinfo_cputime ocpu_time[MAXCPU];
 416         static struct kinfo_cputime ncpu_time[MAXCPU];
 417         size_t slen;
 418         int ncpu;
 419         int cpu;
 420         uint64_t delta;
 421
 422         /* NOTE: Don't use NCpus here; it may not be initialized yet */
 423         bcopy(ncpu_time, ocpu_time, sizeof(struct kinfo_cputime) * TotalCpus);
 424
 425         slen = sizeof(ncpu_time);
 426         if (sysctlbyname("kern.cputime", &ncpu_time, &slen, NULL, 0) < 0) {
 427                 fprintf(stderr, "kern.cputime sysctl not available\n");
 428                 exit(1);
 429         }
 430         ncpu = slen / sizeof(ncpu_time[0]);
 431
 432         delta = 0;
 433         for (cpu = 0; cpu < ncpu; ++cpu) {
 434                 delta += (ncpu_time[cpu].cp_user + ncpu_time[cpu].cp_sys +
 435                           ncpu_time[cpu].cp_nice + ncpu_time[cpu].cp_intr) -
 436                          (ocpu_time[cpu].cp_user + ocpu_time[cpu].cp_sys +
 437                           ocpu_time[cpu].cp_nice + ocpu_time[cpu].cp_intr);
 438         }
 439         return((double)delta / (pollrate * 1000000.0));
 440 }
 441
 442 static void
 443 acpi_getcpufreq_str(int dom_id, int *highest0, int *lowest0)
 444 {
 445         char buf[256], sysid[64];
 446         size_t buflen;
 447         char *ptr;
 448         int v, highest, lowest;
 449
 450         /*
 451          * Retrieve availability list
 452          */
 453         snprintf(sysid, sizeof(sysid), "hw.acpi.cpu.px_dom%d.available",
 454             dom_id);
 455         buflen = sizeof(buf) - 1;
 456         if (sysctlbyname(sysid, buf, &buflen, NULL, 0) < 0)
 457                 return;
 458         buf[buflen] = 0;
 459
 460         /*
 461          * Parse out the highest and lowest cpu frequencies
 462          */
 463         ptr = buf;
 464         highest = lowest = 0;
 465         while (ptr && (v = strtol(ptr, &ptr, 10)) > 0) {
 466                 if (lowest == 0 || lowest > v)
 467                         lowest = v;
 468                 if (highest == 0 || highest < v)
 469                         highest = v;
 470                 /*
 471                  * Detect turbo mode
 472                  */
 473                 if (!TurboOpt && highest - v == 1)
 474                         highest = v;
 475         }
 476
 477         *highest0 = highest;
 478         *lowest0 = lowest;
 479 }
 480
 481 static int
 482 acpi_getcpufreq_bin(int dom_id, int *highest0, int *lowest0)
 483 {
 484         char sysid[64];
 485         int freq[MAXFREQ];
 486         size_t freqlen;
 487         int freqcnt;
 488
 489         /*
 490          * Retrieve availability list
 491          */
 492         snprintf(sysid, sizeof(sysid), "hw.acpi.cpu.px_dom%d.avail", dom_id);
 493         freqlen = sizeof(freq);
 494         if (sysctlbyname(sysid, freq, &freqlen, NULL, 0) < 0)
 495                 return 0;
 496
 497         freqcnt = freqlen / sizeof(freq[0]);
 498         if (freqcnt == 0)
 499                 return 0;
 500
 501         *lowest0 = freq[freqcnt - 1];
 502
 503         *highest0 = freq[0];
 504         if (!TurboOpt && freqcnt > 1 && freq[0] - freq[1] == 1)
 505                 *highest0 = freq[1];
 506         return 1;
 507 }
 508
 509 static void
 510 acpi_getcpufreq(int dom_id, int *highest, int *lowest)
 511 {
 512         *highest = 0;
 513         *lowest = 0;
 514
 515         if (acpi_getcpufreq_bin(dom_id, highest, lowest))
 516                 return;
 517         acpi_getcpufreq_str(dom_id, highest, lowest);
 518 }
 519
 520 /*
 521  * nstate is the requested number of cpus that we wish to run at full
 522  * frequency.  We calculate how many domains we have to adjust to reach
 523  * this goal.
 524  *
 525  * This function also sets the user scheduler global cpu mask.
 526  */
 527 static void
 528 acpi_setcpufreq(int nstate)
 529 {
 530         int ncpus = 0;
 531         int increasing = (nstate > CpuLimit);
 532         struct cpu_pwrdom *dom, *domBeg, *domEnd;
 533         int lowest;
 534         int highest;
 535         int desired;
 536         char sysid[64];
 537         cpumask_t global_cpumask;
 538
 539         /*
 540          * Calculate the ending domain if the number of operating cpus
 541          * has increased.
 542          *
 543          * Calculate the starting domain if the number of operating cpus
 544          * has decreased.
 545          *
 546          * Calculate the mask of cpus the userland scheduler is allowed
 547          * to use.
 548          */
 549         NCpuPwrDomUsed = 0;
 550         CPUMASK_ASSZERO(global_cpumask);
 551         for (dom = TAILQ_FIRST(&CpuPwrDomain); dom != &CpuPwrDomLast;
 552              dom = TAILQ_NEXT(dom, dom_link)) {
 553                 cpumask_t mask;
 554
 555                 if (ncpus >= nstate)
 556                         break;
 557                 ncpus += dom->dom_ncpus;
 558                 ++NCpuPwrDomUsed;
 559
 560                 mask = dom->dom_cpumask;
 561                 if (ncpus > nstate) {
 562                         int i, diff;
 563
 564                         diff = ncpus - nstate;
 565                         for (i = 0; i < diff; ++i) {
 566                                 int c;
 567
 568                                 c = BSRCPUMASK(mask);
 569                                 CPUMASK_NANDBIT(mask, c);
 570                         }
 571                 }
 572                 CPUMASK_ORMASK(global_cpumask, mask);
 573         }
 574
 575         /*
 576          * Make sure that userland scheduler has at least one cpu.
 577          */
 578         if (CPUMASK_TESTZERO(global_cpumask))
 579                 CPUMASK_ORBIT(global_cpumask, 0);
 580         if (DebugOpt) {
 581                 int i;
 582
 583                 printf("\nusched cpumask: ");
 584                 for (i = 0; i < (int)NELEM(global_cpumask.ary); ++i)
 585                         printf("%jx ", (uintmax_t)global_cpumask.ary[i]);
 586                 printf("\n");
 587                 fflush(stdout);
 588         }
 589
 590         syslog(LOG_INFO, "using %d cpus", nstate);
 591
 592         /*
 593          * Set the mask of cpus the userland scheduler is allowed to use.
 594          */
 595         sysctlbyname("kern.usched_global_cpumask", NULL, 0,
 596                      &global_cpumask, sizeof(global_cpumask));
 597
 598         if (increasing) {
 599                 domBeg = CpuPwrDomLimit;
 600                 domEnd = dom;
 601         } else {
 602                 domBeg = dom;
 603                 domEnd = CpuPwrDomLimit;
 604         }
 605         CpuPwrDomLimit = dom;
 606         CpuLimit = nstate;
 607
 608         /*
 609          * Adjust the cpu frequency
 610          */
 611         for (dom = domBeg; dom != domEnd; dom = TAILQ_NEXT(dom, dom_link)) {
 612                 acpi_getcpufreq(dom->dom_id, &highest, &lowest);
 613                 if (highest == 0 || lowest == 0)
 614                         continue;
 615
 616                 /*
 617                  * Calculate the desired cpu frequency, test, and set.
 618                  */
 619                 desired = increasing ? highest : lowest;
 620
 621                 snprintf(sysid, sizeof(sysid), "hw.acpi.cpu.px_dom%d.select",
 622                     dom->dom_id);
 623                 if (DebugOpt) {
 624                         printf("dom%d set frequency %d\n",
 625                                dom->dom_id, desired);
 626                 }
 627                 sysctlbyname(sysid, NULL, NULL, &desired, sizeof(desired));
 628         }
 629 }
 630
 631 static
 632 void
 633 usage(void)
 634 {
 635         fprintf(stderr, "usage: powerd [-dt] [-p hysteresis] "
 636             "[-u trigger_up] [-T sample_interval] [-r poll_interval] "
 637             "[-B min_battery_life] [-L low_battery_linger] "
 638             "[-P battery_poll_interval] [-Q]\n");
 639         exit(1);
 640 }
 641
 642 #ifndef timespecsub
 643 #define timespecsub(vvp, uvp)                                           \
 644         do {                                                            \
 645                 (vvp)->tv_sec -= (uvp)->tv_sec;                         \
 646                 (vvp)->tv_nsec -= (uvp)->tv_nsec;                       \
 647                 if ((vvp)->tv_nsec < 0) {                               \
 648                         (vvp)->tv_sec--;                                \
 649                         (vvp)->tv_nsec += 1000000000;                   \
 650                 }                                                       \
 651         } while (0)
 652 #endif
 653
 654 #define BAT_SYSCTL_TIME_MAX     50000000 /* unit: nanosecond */
 655
 656 static int
 657 has_battery(void)
 658 {
 659         struct timespec s, e;
 660         size_t len;
 661         int val;
 662
 663         clock_gettime(CLOCK_MONOTONIC_FAST, &s);
 664         BatLifePrevT = s;
 665
 666         len = sizeof(val);
 667         if (sysctlbyname("hw.acpi.acline", &val, &len, NULL, 0) < 0) {
 668                 /* No AC line information */
 669                 return 0;
 670         }
 671         clock_gettime(CLOCK_MONOTONIC_FAST, &e);
 672
 673         timespecsub(&e, &s);
 674         if (e.tv_sec > 0 || e.tv_nsec > BAT_SYSCTL_TIME_MAX) {
 675                 /* hw.acpi.acline takes to long to be useful */
 676                 syslog(LOG_NOTICE, "hw.acpi.acline takes too long");
 677                 return 0;
 678         }
 679
 680         clock_gettime(CLOCK_MONOTONIC_FAST, &s);
 681         len = sizeof(val);
 682         if (sysctlbyname("hw.acpi.battery.life", &val, &len, NULL, 0) < 0) {
 683                 /* No battery life */
 684                 return 0;
 685         }
 686         clock_gettime(CLOCK_MONOTONIC_FAST, &e);
 687
 688         timespecsub(&e, &s);
 689         if (e.tv_sec > 0 || e.tv_nsec > BAT_SYSCTL_TIME_MAX) {
 690                 /* hw.acpi.battery.life takes to long to be useful */
 691                 syslog(LOG_NOTICE, "hw.acpi.battery.life takes too long");
 692                 return 0;
 693         }
 694         return 1;
 695 }
 696
 697 static void
 698 low_battery_alert(int life)
 699 {
 700         int fmt, stereo, freq;
 701         int fd;
 702
 703         syslog(LOG_ALERT, "low battery life %d%%, please plugin AC line, #%d",
 704             life, BatShutdownLingerCnt);
 705         ++BatShutdownLingerCnt;
 706
 707         if (!BatShutdownAudioAlert)
 708                 return;
 709
 710         fd = open("/dev/dsp", O_WRONLY);
 711         if (fd < 0)
 712                 return;
 713
 714         fmt = AFMT_S16_LE;
 715         if (ioctl(fd, SNDCTL_DSP_SETFMT, &fmt, sizeof(fmt)) < 0)
 716                 goto done;
 717
 718         stereo = 0;
 719         if (ioctl(fd, SNDCTL_DSP_STEREO, &stereo, sizeof(stereo)) < 0)
 720                 goto done;
 721
 722         freq = 44100;
 723         if (ioctl(fd, SNDCTL_DSP_SPEED, &freq, sizeof(freq)) < 0)
 724                 goto done;
 725
 726         write(fd, alert1, sizeof(alert1));
 727         write(fd, alert1, sizeof(alert1));
 728
 729 done:
 730         close(fd);
 731 }
 732
 733 static int
 734 mon_battery(void)
 735 {
 736         struct timespec cur, ts;
 737         int acline, life;
 738         size_t len;
 739
 740         clock_gettime(CLOCK_MONOTONIC_FAST, &cur);
 741         ts = cur;
 742         timespecsub(&ts, &BatLifePrevT);
 743         if (ts.tv_sec < BatLifePollIntvl)
 744                 return 1;
 745         BatLifePrevT = cur;
 746
 747         len = sizeof(acline);
 748         if (sysctlbyname("hw.acpi.acline", &acline, &len, NULL, 0) < 0)
 749                 return 1;
 750         if (acline) {
 751                 BatShutdownLinger = -1;
 752                 BatShutdownLingerCnt = 0;
 753                 return 1;
 754         }
 755
 756         len = sizeof(life);
 757         if (sysctlbyname("hw.acpi.battery.life", &life, &len, NULL, 0) < 0)
 758                 return 1;
 759
 760         if (BatShutdownLinger > 0) {
 761                 ts = cur;
 762                 timespecsub(&ts, &BatShutdownStartT);
 763                 if (ts.tv_sec > BatShutdownLinger)
 764                         BatShutdownLinger = 0;
 765         }
 766
 767         if (life <= BatLifeMin) {
 768                 if (BatShutdownLinger == 0 || BatShutdownLingerSet == 0) {
 769                         syslog(LOG_ALERT, "low battery life %d%%, "
 770                             "shutting down", life);
 771                         if (vfork() == 0)
 772                                 execlp("poweroff", "poweroff", NULL);
 773                         return 0;
 774                 } else if (BatShutdownLinger < 0) {
 775                         BatShutdownLinger = BatShutdownLingerSet;
 776                         BatShutdownStartT = cur;
 777                 }
 778                 low_battery_alert(life);
 779         }
 780         return 1;
 781 }
 782
 783 static void
 784 getncpus(void)
 785 {
 786         size_t slen;
 787
 788         slen = sizeof(TotalCpus);
 789         if (sysctlbyname("hw.ncpu", &TotalCpus, &slen, NULL, 0) < 0)
 790                 err(1, "sysctlbyname hw.ncpu failed");
 791         if (DebugOpt)
 792                 printf("hw.ncpu %d\n", TotalCpus);
 793 }