1 /* $NetBSD: apmd.c,v 1.22 2002/01/11 04:35:52 itojun Exp $ */ 2 3 /*- 4 * Copyright (c) 1996, 2000 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by John Kohl. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 #include <stdio.h> 40 #include <errno.h> 41 #include <syslog.h> 42 #include <fcntl.h> 43 #include <unistd.h> 44 #include <util.h> 45 #include <stdlib.h> 46 #include <string.h> 47 #include <signal.h> 48 #include <sys/types.h> 49 #include <pwd.h> 50 #include <grp.h> 51 #include <sys/stat.h> 52 #include <sys/ioctl.h> 53 #include <sys/time.h> 54 #include <sys/socket.h> 55 #include <sys/un.h> 56 #include <sys/wait.h> 57 #include <machine/apmvar.h> 58 #include <err.h> 59 #include "pathnames.h" 60 #include "apm-proto.h" 61 62 #define MAX(a,b) (a > b ? a : b) 63 #define TRUE 1 64 #define FALSE 0 65 66 #define POWER_STATUS_ACON 0x1 67 #define POWER_STATUS_LOWBATTNOW 0x2 68 69 const char apmdev[] = _PATH_APM_CTLDEV; 70 const char sockfile[] = _PATH_APM_SOCKET; 71 72 static int debug = 0; 73 static int verbose = 0; 74 75 void usage (void); 76 int power_status (int fd, int force, struct apm_power_info *pinfo); 77 int bind_socket (const char *sn, mode_t mode, uid_t uid, gid_t gid); 78 enum apm_state handle_client(int sock_fd, int ctl_fd); 79 void suspend(int ctl_fd); 80 void stand_by(int ctl_fd); 81 void resume(int ctl_fd); 82 void sigexit(int signo); 83 void make_noise(int howmany); 84 void do_etc_file(const char *file); 85 void do_ac_state(int state); 86 87 void 88 sigexit(int signo) 89 { 90 exit(1); 91 } 92 93 void 94 usage(void) 95 { 96 fprintf(stderr,"usage: %s [-adlqsv] [-t seconds] [-S sockname]\n\t[-m sockmode] [-o sockowner:sockgroup] [-f devname]\n", getprogname()); 97 exit(1); 98 } 99 100 101 int 102 power_status(int fd, int force, struct apm_power_info *pinfo) 103 { 104 struct apm_power_info bstate; 105 static struct apm_power_info last; 106 int acon = 0; 107 int lowbattnow = 0; 108 109 memset(&bstate, 0, sizeof(bstate)); 110 if (ioctl(fd, APM_IOC_GETPOWER, &bstate) == 0) { 111 /* various conditions under which we report status: something changed 112 enough since last report, or asked to force a print */ 113 if (bstate.ac_state == APM_AC_ON) 114 acon = 1; 115 if (bstate.battery_state != last.battery_state && 116 bstate.battery_state == APM_BATT_LOW) 117 lowbattnow = 1; 118 if (force || 119 bstate.ac_state != last.ac_state || 120 bstate.battery_state != last.battery_state || 121 (bstate.minutes_left && bstate.minutes_left < 15) || 122 abs(bstate.battery_life - last.battery_life) > 20) { 123 if (verbose) { 124 if (bstate.minutes_left) 125 syslog(LOG_NOTICE, 126 "battery status: %s. external power status: %s. " 127 "estimated battery life %d%% (%d minutes)", 128 battstate(bstate.battery_state), 129 ac_state(bstate.ac_state), bstate.battery_life, 130 bstate.minutes_left); 131 else 132 syslog(LOG_NOTICE, 133 "battery status: %s. external power status: %s. " 134 "estimated battery life %d%%", 135 battstate(bstate.battery_state), 136 ac_state(bstate.ac_state), bstate.battery_life); 137 } 138 last = bstate; 139 } 140 if (pinfo) 141 *pinfo = bstate; 142 } else 143 syslog(LOG_ERR, "cannot fetch power status: %m"); 144 return ((acon?POWER_STATUS_ACON:0) | 145 (lowbattnow?POWER_STATUS_LOWBATTNOW:0)); 146 } 147 148 static char *socketname; 149 150 static void sockunlink(void); 151 152 static void 153 sockunlink(void) 154 { 155 if (socketname) 156 (void) remove(socketname); 157 } 158 159 int 160 bind_socket(const char *sockname, mode_t mode, uid_t uid, gid_t gid) 161 { 162 int sock; 163 struct sockaddr_un s_un; 164 165 sock = socket(AF_LOCAL, SOCK_STREAM, 0); 166 if (sock == -1) 167 err(1, "cannot create local socket"); 168 169 s_un.sun_family = AF_LOCAL; 170 strncpy(s_un.sun_path, sockname, sizeof(s_un.sun_path)); 171 s_un.sun_len = SUN_LEN(&s_un); 172 /* remove it if present, we're moving in */ 173 (void) remove(sockname); 174 if (bind(sock, (struct sockaddr *)&s_un, s_un.sun_len) == -1) 175 err(1, "cannot create APM socket"); 176 if (chmod(sockname, mode) == -1 || chown(sockname, uid, gid) == -1) 177 err(1, "cannot set socket mode/owner/group to %o/%d/%d", 178 mode, uid, gid); 179 listen(sock, 1); 180 socketname = strdup(sockname); 181 atexit(sockunlink); 182 return sock; 183 } 184 185 enum apm_state 186 handle_client(int sock_fd, int ctl_fd) 187 { 188 /* accept a handle from the client, process it, then clean up */ 189 int cli_fd; 190 struct sockaddr_un from; 191 int fromlen = sizeof(from); 192 struct apm_command cmd; 193 struct apm_reply reply; 194 195 cli_fd = accept(sock_fd, (struct sockaddr *)&from, &fromlen); 196 if (cli_fd == -1) { 197 syslog(LOG_INFO, "client accept failure: %m"); 198 return NORMAL; 199 } 200 if (recv(cli_fd, &cmd, sizeof(cmd), 0) != sizeof(cmd)) { 201 (void) close(cli_fd); 202 syslog(LOG_INFO, "client size botch"); 203 return NORMAL; 204 } 205 if (cmd.vno != APMD_VNO) { 206 close(cli_fd); /* terminate client */ 207 /* no error message, just drop it. */ 208 return NORMAL; 209 } 210 power_status(ctl_fd, 0, &reply.batterystate); 211 switch (cmd.action) { 212 default: 213 reply.newstate = NORMAL; 214 break; 215 case SUSPEND: 216 reply.newstate = SUSPENDING; 217 break; 218 case STANDBY: 219 reply.newstate = STANDING_BY; 220 break; 221 } 222 reply.vno = APMD_VNO; 223 if (send(cli_fd, &reply, sizeof(reply), 0) != sizeof(reply)) { 224 syslog(LOG_INFO, "client reply botch"); 225 } 226 close(cli_fd); 227 return reply.newstate; 228 } 229 230 static int speaker_ok = TRUE; 231 232 void 233 make_noise(howmany) 234 int howmany; 235 { 236 int spkrfd; 237 int trycnt; 238 239 if (!speaker_ok) /* don't bother after sticky errors */ 240 return; 241 242 for (trycnt = 0; trycnt < 3; trycnt++) { 243 spkrfd = open(_PATH_DEV_SPEAKER, O_WRONLY); 244 if (spkrfd == -1) { 245 switch (errno) { 246 case EBUSY: 247 usleep(500000); 248 errno = EBUSY; 249 continue; 250 case ENOENT: 251 case ENODEV: 252 case ENXIO: 253 case EPERM: 254 case EACCES: 255 syslog(LOG_INFO, 256 "speaker device " _PATH_DEV_SPEAKER " unavailable: %m"); 257 speaker_ok = FALSE; 258 return; 259 } 260 } else 261 break; 262 } 263 if (spkrfd == -1) { 264 syslog(LOG_WARNING, "cannot open " _PATH_DEV_SPEAKER ": %m"); 265 return; 266 } 267 syslog(LOG_DEBUG, "sending %d tones to speaker\n", howmany); 268 write (spkrfd, "o4cc", 2 + howmany); 269 close(spkrfd); 270 return; 271 } 272 273 274 void 275 suspend(int ctl_fd) 276 { 277 do_etc_file(_PATH_APM_ETC_SUSPEND); 278 sync(); 279 make_noise(2); 280 sync(); 281 sync(); 282 sleep(1); 283 ioctl(ctl_fd, APM_IOC_SUSPEND, 0); 284 } 285 286 void 287 stand_by(int ctl_fd) 288 { 289 do_etc_file(_PATH_APM_ETC_STANDBY); 290 sync(); 291 make_noise(1); 292 sync(); 293 sync(); 294 sleep(1); 295 ioctl(ctl_fd, APM_IOC_STANDBY, 0); 296 } 297 298 #define TIMO (10*60) /* 10 minutes */ 299 300 void 301 resume(int ctl_fd) 302 { 303 do_etc_file(_PATH_APM_ETC_RESUME); 304 } 305 306 int 307 main(int argc, char *argv[]) 308 { 309 const char *fname = apmdev; 310 int ctl_fd, sock_fd, ch, ready; 311 int statonly = 0; 312 fd_set devfds; 313 fd_set selcopy; 314 struct apm_event_info apmevent; 315 int suspends, standbys, resumes; 316 int ac_is_off; 317 int noacsleep = 0; 318 int lowbattsleep = 0; 319 mode_t mode = 0660; 320 struct timeval tv = {TIMO, 0}, stv; 321 const char *sockname = sockfile; 322 char *user, *group; 323 char *scratch; 324 uid_t uid = 0; 325 gid_t gid = 0; 326 struct passwd *pw; 327 struct group *gr; 328 329 while ((ch = getopt(argc, argv, "adlqsvf:t:S:m:o:")) != -1) 330 switch(ch) { 331 case 'q': 332 speaker_ok = FALSE; 333 break; 334 case 'a': 335 noacsleep = 1; 336 break; 337 case 'l': 338 lowbattsleep = 1; 339 break; 340 case 'd': 341 debug = 1; 342 break; 343 case 'v': 344 verbose = 1; 345 break; 346 case 'f': 347 fname = optarg; 348 break; 349 case 'S': 350 sockname = optarg; 351 break; 352 case 't': 353 tv.tv_sec = strtoul(optarg, 0, 0); 354 if (tv.tv_sec == 0) 355 usage(); 356 break; 357 case 'm': 358 mode = strtoul(optarg, 0, 8); 359 if (mode == 0) 360 usage(); 361 break; 362 case 'o': 363 /* (user):(group) */ 364 user = optarg; 365 group = strchr(user, ':'); 366 if (group) 367 *group++ = '\0'; 368 if (*user) { 369 uid = strtoul(user, &scratch, 0); 370 if (*scratch != '\0') { 371 pw = getpwnam(user); 372 if (pw) 373 uid = pw->pw_uid; 374 else 375 errx(1, "user name `%s' unknown", user); 376 } 377 } 378 if (group && *group) { 379 gid = strtoul(group, &scratch, 0); 380 if (*scratch != '\0') { 381 gr = getgrnam(group); 382 if (gr) 383 gid = gr->gr_gid; 384 else 385 errx(1, "group name `%s' unknown", group); 386 } 387 } 388 break; 389 case 's': /* status only */ 390 statonly = 1; 391 break; 392 case '?': 393 394 default: 395 usage(); 396 } 397 argc -= optind; 398 argv += optind; 399 if (debug) { 400 openlog("apmd", 0, LOG_LOCAL1); 401 } else { 402 daemon(0, 0); 403 openlog("apmd", 0, LOG_DAEMON); 404 setlogmask(LOG_UPTO(LOG_NOTICE)); 405 pidfile(NULL); 406 } 407 if ((ctl_fd = open(fname, O_RDWR)) == -1) { 408 syslog(LOG_ERR, "cannot open device file `%s'", fname); 409 exit(1); 410 } 411 412 if (statonly) { 413 power_status(ctl_fd, 1, 0); 414 exit(0); 415 } else { 416 struct apm_power_info pinfo; 417 power_status(ctl_fd, 1, &pinfo); 418 do_ac_state(pinfo.ac_state); 419 ac_is_off = (pinfo.ac_state == APM_AC_OFF); 420 } 421 422 (void) signal(SIGTERM, sigexit); 423 (void) signal(SIGHUP, sigexit); 424 (void) signal(SIGINT, sigexit); 425 (void) signal(SIGPIPE, SIG_IGN); 426 427 428 sock_fd = bind_socket(sockname, mode, uid, gid); 429 430 FD_ZERO(&devfds); 431 FD_SET(ctl_fd, &devfds); 432 FD_SET(sock_fd, &devfds); 433 434 435 436 for (selcopy = devfds, errno = 0, stv = tv; 437 (ready = select(MAX(ctl_fd,sock_fd)+1, &selcopy, 0, 0, &stv)) >= 0 || 438 errno == EINTR; 439 selcopy = devfds, errno = 0, stv = tv) { 440 if (errno == EINTR) 441 continue; 442 if (ready == 0) { 443 int status; 444 /* wakeup for timeout: take status */ 445 status = power_status(ctl_fd, 0, 0); 446 if (lowbattsleep && status&POWER_STATUS_LOWBATTNOW) { 447 if (noacsleep && status&POWER_STATUS_ACON) { 448 if (debug) 449 syslog(LOG_DEBUG, 450 "not sleeping because " 451 "AC is connected"); 452 } else 453 suspend(ctl_fd); 454 } 455 } 456 if (FD_ISSET(ctl_fd, &selcopy)) { 457 suspends = standbys = resumes = 0; 458 while (ioctl(ctl_fd, APM_IOC_NEXTEVENT, &apmevent) == 0) { 459 if (debug) 460 syslog(LOG_DEBUG, "apmevent %04x index %d", apmevent.type, 461 apmevent.index); 462 switch (apmevent.type) { 463 case APM_SUSPEND_REQ: 464 case APM_USER_SUSPEND_REQ: 465 case APM_CRIT_SUSPEND_REQ: 466 suspends++; 467 break; 468 case APM_BATTERY_LOW: 469 if (lowbattsleep) 470 suspends++; 471 break; 472 case APM_USER_STANDBY_REQ: 473 case APM_STANDBY_REQ: 474 standbys++; 475 break; 476 #if 0 477 case APM_CANCEL: 478 suspends = standbys = 0; 479 break; 480 #endif 481 case APM_NORMAL_RESUME: 482 case APM_CRIT_RESUME: 483 case APM_SYS_STANDBY_RESUME: 484 resumes++; 485 break; 486 case APM_POWER_CHANGE: 487 { 488 struct apm_power_info pinfo; 489 power_status(ctl_fd, 0, &pinfo); 490 /* power status can change without ac status changing */ 491 if (ac_is_off != (pinfo.ac_state == APM_AC_OFF)) { 492 do_ac_state(pinfo.ac_state); 493 ac_is_off = (pinfo.ac_state == APM_AC_OFF); 494 } 495 break; 496 } 497 default: 498 break; 499 } 500 } 501 if ((standbys || suspends) && noacsleep && 502 (power_status(ctl_fd, 0, 0) & POWER_STATUS_ACON)) { 503 if (debug) 504 syslog(LOG_DEBUG, "not sleeping because AC is connected"); 505 } else if (suspends) { 506 suspend(ctl_fd); 507 } else if (standbys) { 508 stand_by(ctl_fd); 509 } else if (resumes) { 510 resume(ctl_fd); 511 if (verbose) 512 syslog(LOG_NOTICE, "system resumed from APM sleep"); 513 } 514 ready--; 515 } 516 if (ready == 0) 517 continue; 518 if (FD_ISSET(sock_fd, &selcopy)) { 519 switch (handle_client(sock_fd, ctl_fd)) { 520 case NORMAL: 521 break; 522 case SUSPENDING: 523 suspend(ctl_fd); 524 break; 525 case STANDING_BY: 526 stand_by(ctl_fd); 527 break; 528 } 529 } 530 } 531 syslog(LOG_ERR, "select failed: %m"); 532 exit(1); 533 } 534 535 void 536 do_etc_file(const char *file) 537 { 538 pid_t pid; 539 int status; 540 const char *prog; 541 542 /* If file doesn't exist, do nothing. */ 543 if (access(file, X_OK|R_OK)) { 544 if (debug) 545 syslog(LOG_DEBUG, "do_etc_file(): cannot access file %s", file); 546 return; 547 } 548 549 prog = strrchr(file, '/'); 550 if (prog) 551 prog++; 552 else 553 prog = file; 554 555 pid = fork(); 556 switch (pid) { 557 case -1: 558 syslog(LOG_ERR, "failed to fork(): %m"); 559 return; 560 case 0: 561 /* We are the child. */ 562 execl(file, prog, NULL); 563 _exit(1); 564 /* NOTREACHED */ 565 default: 566 /* We are the parent. */ 567 wait4(pid, &status, 0, 0); 568 if (WIFEXITED(status)) { 569 if (debug) 570 syslog(LOG_DEBUG, "%s exited with status %d", file, 571 WEXITSTATUS(status)); 572 } else 573 syslog(LOG_ERR, "%s exited abnormally.", file); 574 break; 575 } 576 } 577 578 void 579 do_ac_state(int state) 580 { 581 switch (state) { 582 case APM_AC_OFF: 583 do_etc_file(_PATH_APM_ETC_BATTERY); 584 break; 585 case APM_AC_ON: 586 case APM_AC_BACKUP: 587 do_etc_file(_PATH_APM_ETC_LINE); 588 break; 589 default: 590 /* Silently ignore */ ; 591 } 592 } 593