Home | History | Annotate | Line # | Download | only in envstat
envstat.c revision 1.69
      1 /* $NetBSD: envstat.c,v 1.69 2008/08/09 04:49:23 christos Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2007, 2008 Juan Romero Pardines.
      5  * All rights reserved.
      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  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26  */
     27 
     28 #include <sys/cdefs.h>
     29 #ifndef lint
     30 __RCSID("$NetBSD: envstat.c,v 1.69 2008/08/09 04:49:23 christos Exp $");
     31 #endif /* not lint */
     32 
     33 #include <stdio.h>
     34 #include <stdlib.h>
     35 #include <stdbool.h>
     36 #include <string.h>
     37 #include <unistd.h>
     38 #include <fcntl.h>
     39 #include <err.h>
     40 #include <errno.h>
     41 #include <syslog.h>
     42 #include <sys/envsys.h>
     43 #include <sys/types.h>
     44 #include <sys/queue.h>
     45 #include <prop/proplib.h>
     46 
     47 #include "envstat.h"
     48 
     49 #define _PATH_DEV_SYSMON	"/dev/sysmon"
     50 
     51 #define ENVSYS_DFLAG	0x00000001	/* list registered devices */
     52 #define ENVSYS_FFLAG	0x00000002	/* show temp in farenheit */
     53 #define ENVSYS_LFLAG	0x00000004	/* list sensors */
     54 #define ENVSYS_XFLAG	0x00000008	/* externalize dictionary */
     55 #define ENVSYS_IFLAG 	0x00000010	/* skip invalid sensors */
     56 #define ENVSYS_SFLAG	0x00000020	/* remove all properties set */
     57 #define ENVSYS_TFLAG	0x00000040	/* make statistics */
     58 
     59 /* Sensors */
     60 typedef struct envsys_sensor {
     61 	SIMPLEQ_ENTRY(envsys_sensor) entries;
     62 	int32_t	cur_value;
     63 	int32_t	max_value;
     64 	int32_t	min_value;
     65 	int32_t	avg_value;
     66 	int32_t critcap_value;
     67 	int32_t	critmin_value;
     68 	int32_t	critmax_value;
     69 	char	desc[ENVSYS_DESCLEN];
     70 	char	type[ENVSYS_DESCLEN];
     71 	char	drvstate[ENVSYS_DESCLEN];
     72 	char	battcap[ENVSYS_DESCLEN];
     73 	char 	dvname[ENVSYS_DESCLEN];
     74 	bool	invalid;
     75 	bool	visible;
     76 	bool	percentage;
     77 } *sensor_t;
     78 
     79 /* Sensor statistics */
     80 typedef struct envsys_sensor_stats {
     81 	SIMPLEQ_ENTRY(envsys_sensor_stats) entries;
     82 	int32_t	max;
     83 	int32_t	min;
     84 	int32_t avg;
     85 	char	desc[ENVSYS_DESCLEN];
     86 } *sensor_stats_t;
     87 
     88 /* Device properties */
     89 typedef struct envsys_dvprops {
     90 	uint64_t	refresh_timo;
     91 	/* more members could be added in the future */
     92 } *dvprops_t;
     93 
     94 /* A simple queue to manage all sensors */
     95 static SIMPLEQ_HEAD(, envsys_sensor) sensors_list =
     96     SIMPLEQ_HEAD_INITIALIZER(sensors_list);
     97 
     98 /* A simple queue to manage statistics for all sensors */
     99 static SIMPLEQ_HEAD(, envsys_sensor_stats) sensor_stats_list =
    100     SIMPLEQ_HEAD_INITIALIZER(sensor_stats_list);
    101 
    102 static unsigned int 	interval, flags, width;
    103 static char 		*mydevname, *sensors;
    104 static bool 		statistics;
    105 static u_int		header_passes;
    106 
    107 static int 		parse_dictionary(int);
    108 static int 		send_dictionary(FILE *, int);
    109 static int 		find_sensors(prop_array_t, const char *, dvprops_t);
    110 static void 		print_sensors(void);
    111 static int 		check_sensors(char *);
    112 static int 		usage(void);
    113 
    114 
    115 int main(int argc, char **argv)
    116 {
    117 	prop_dictionary_t dict;
    118 	int c, fd, rval = 0;
    119 	char *endptr, *configfile = NULL;
    120 	FILE *cf;
    121 
    122 	setprogname(argv[0]);
    123 
    124 	while ((c = getopt(argc, argv, "c:Dd:fIi:lrSs:Tw:x")) != -1) {
    125 		switch (c) {
    126 		case 'c':	/* configuration file */
    127 			configfile = strdup(optarg);
    128 			if (configfile == NULL)
    129 				err(EXIT_FAILURE, "strdup");
    130 			break;
    131 		case 'D':	/* list registered devices */
    132 			flags |= ENVSYS_DFLAG;
    133 			break;
    134 		case 'd':	/* show sensors of a specific device */
    135 			mydevname = strdup(optarg);
    136 			if (mydevname == NULL)
    137 				err(EXIT_FAILURE, "strdup");
    138 			break;
    139 		case 'f':	/* display temperature in Farenheit */
    140 			flags |= ENVSYS_FFLAG;
    141 			break;
    142 		case 'I':	/* Skips invalid sensors */
    143 			flags |= ENVSYS_IFLAG;
    144 			break;
    145 		case 'i':	/* wait time between intervals */
    146 			interval = (unsigned int)strtoul(optarg, &endptr, 10);
    147 			if (*endptr != '\0')
    148 				errx(EXIT_FAILURE, "bad interval '%s'", optarg);
    149 			break;
    150 		case 'l':	/* list sensors */
    151 			flags |= ENVSYS_LFLAG;
    152 			break;
    153 		case 'r':
    154 			/*
    155 			 * This flag is noop.. it's only here for
    156 			 * compatibility with the old implementation.
    157 			 */
    158 			break;
    159 		case 'S':
    160 			flags |= ENVSYS_SFLAG;
    161 			break;
    162 		case 's':	/* only show specified sensors */
    163 			sensors = strdup(optarg);
    164 			if (sensors == NULL)
    165 				err(EXIT_FAILURE, "strdup");
    166 			break;
    167 		case 'T':	/* make statistics */
    168 			flags |= ENVSYS_TFLAG;
    169 			break;
    170 		case 'w':	/* width value for the lines */
    171 			width = (unsigned int)strtoul(optarg, &endptr, 10);
    172 			if (*endptr != '\0')
    173 				errx(EXIT_FAILURE, "bad width '%s'", optarg);
    174 			break;
    175 		case 'x':	/* print the dictionary in raw format */
    176 			flags |= ENVSYS_XFLAG;
    177 			break;
    178 		case '?':
    179 		default:
    180 			usage();
    181 			/* NOTREACHED */
    182 		}
    183 	}
    184 
    185 	argc -= optind;
    186 	argv += optind;
    187 
    188 	if (argc > 0)
    189 		usage();
    190 
    191 	/* Check if we want to make statistics */
    192 	if (flags & ENVSYS_TFLAG) {
    193 		if (!interval)
    194 			errx(EXIT_FAILURE,
    195 		    	    "-T cannot be used without an interval (-i)");
    196 		else
    197 			statistics = true;
    198 	}
    199 
    200 	if (mydevname && sensors)
    201 		errx(EXIT_FAILURE, "-d flag cannot be used with -s");
    202 
    203 	/* Open the device in ro mode */
    204 	if ((fd = open(_PATH_DEV_SYSMON, O_RDONLY)) == -1)
    205 		err(EXIT_FAILURE, "%s", _PATH_DEV_SYSMON);
    206 
    207 	/* Print dictionary in raw mode */
    208 	if (flags & ENVSYS_XFLAG) {
    209 		rval = prop_dictionary_recv_ioctl(fd,
    210 						  ENVSYS_GETDICTIONARY,
    211 						  &dict);
    212 		if (rval)
    213 			errx(EXIT_FAILURE, "%s", strerror(rval));
    214 
    215 		config_dict_dump(dict);
    216 
    217 	/* Remove all properties set in dictionary */
    218 	} else if (flags & ENVSYS_SFLAG) {
    219 		/* Close the ro descriptor */
    220 		(void)close(fd);
    221 
    222 		/* open the fd in rw mode */
    223 		if ((fd = open(_PATH_DEV_SYSMON, O_RDWR)) == -1)
    224 			err(EXIT_FAILURE, "%s", _PATH_DEV_SYSMON);
    225 
    226 		dict = prop_dictionary_create();
    227 		if (!dict)
    228 			err(EXIT_FAILURE, "prop_dictionary_create");
    229 
    230 		rval = prop_dictionary_set_bool(dict,
    231 						"envsys-remove-props",
    232 					        true);
    233 		if (!rval)
    234 			err(EXIT_FAILURE, "prop_dict_set_bool");
    235 
    236 		/* send the dictionary to the kernel now */
    237 		rval = prop_dictionary_send_ioctl(dict, fd, ENVSYS_REMOVEPROPS);
    238 		if (rval)
    239 			warnx("%s", strerror(rval));
    240 
    241 	/* Set properties in dictionary */
    242 	} else if (configfile) {
    243 		/*
    244 		 * Parse the configuration file.
    245 		 */
    246 		if ((cf = fopen(configfile, "r")) == NULL) {
    247 			syslog(LOG_ERR, "fopen failed: %s", strerror(errno));
    248 			errx(EXIT_FAILURE, "%s", strerror(errno));
    249 		}
    250 
    251 		rval = send_dictionary(cf, fd);
    252 		(void)fclose(cf);
    253 
    254 	/* Show sensors with interval */
    255 	} else if (interval) {
    256 		for (;;) {
    257 			rval = parse_dictionary(fd);
    258 			if (rval)
    259 				break;
    260 
    261 			(void)fflush(stdout);
    262 			(void)sleep(interval);
    263 		}
    264 	/* Show sensors without interval */
    265 	} else {
    266 		rval = parse_dictionary(fd);
    267 	}
    268 
    269 	if (sensors)
    270 		free(sensors);
    271 	if (mydevname)
    272 		free(mydevname);
    273 	(void)close(fd);
    274 
    275 	return rval ? EXIT_FAILURE : EXIT_SUCCESS;
    276 }
    277 
    278 static int
    279 send_dictionary(FILE *cf, int fd)
    280 {
    281 	prop_dictionary_t kdict, udict;
    282 	int error = 0;
    283 
    284 	/* Retrieve dictionary from kernel */
    285 	error = prop_dictionary_recv_ioctl(fd, ENVSYS_GETDICTIONARY, &kdict);
    286       	if (error)
    287 		return error;
    288 
    289 	config_parse(cf, kdict);
    290 
    291 	/*
    292 	 * Dictionary built by the parser from the configuration file.
    293 	 */
    294 	udict = config_dict_parsed();
    295 
    296 	/*
    297 	 * Close the read only descriptor and open a new one read write.
    298 	 */
    299 	(void)close(fd);
    300 	if ((fd = open(_PATH_DEV_SYSMON, O_RDWR)) == -1) {
    301 		error = errno;
    302 		warn("%s", _PATH_DEV_SYSMON);
    303 		return error;
    304 	}
    305 
    306 	/*
    307 	 * Send our sensor properties dictionary to the kernel then.
    308 	 */
    309 	error = prop_dictionary_send_ioctl(udict, fd, ENVSYS_SETDICTIONARY);
    310 	if (error)
    311 		warnx("%s", strerror(error));
    312 
    313 	prop_object_release(udict);
    314 	return error;
    315 }
    316 
    317 static sensor_stats_t
    318 find_stats_sensor(const char *desc)
    319 {
    320 	sensor_stats_t stats;
    321 
    322 	/*
    323 	 * If we matched a sensor by its description return it, otherwise
    324 	 * allocate a new one.
    325 	 */
    326 	SIMPLEQ_FOREACH(stats, &sensor_stats_list, entries)
    327 		if (strcmp(stats->desc, desc) == 0)
    328 			return stats;
    329 
    330 	stats = calloc(1, sizeof(*stats));
    331 	if (stats == NULL)
    332 		return NULL;
    333 
    334 	(void)strlcpy(stats->desc, desc, sizeof(stats->desc));
    335 	SIMPLEQ_INSERT_TAIL(&sensor_stats_list, stats, entries);
    336 
    337 	return stats;
    338 }
    339 
    340 static int
    341 parse_dictionary(int fd)
    342 {
    343 	sensor_t sensor = NULL;
    344 	dvprops_t edp = NULL;
    345 	prop_array_t array;
    346 	prop_dictionary_t dict;
    347 	prop_object_iterator_t iter;
    348 	prop_object_t obj;
    349 	const char *dnp = NULL;
    350 	int rval = 0;
    351 
    352 	/* receive dictionary from kernel */
    353 	rval = prop_dictionary_recv_ioctl(fd, ENVSYS_GETDICTIONARY, &dict);
    354 	if (rval)
    355 		return rval;
    356 
    357 	/* No drivers registered? */
    358 	if (prop_dictionary_count(dict) == 0) {
    359 		warnx("no drivers registered");
    360 		goto out;
    361 	}
    362 
    363 	if (mydevname) {
    364 		/* -d flag specified, print sensors only for this device */
    365 		obj = prop_dictionary_get(dict, mydevname);
    366 		if (prop_object_type(obj) != PROP_TYPE_ARRAY) {
    367 			warnx("unknown device `%s'", mydevname);
    368 			rval = EINVAL;
    369 			goto out;
    370 		}
    371 
    372 		rval = find_sensors(obj, mydevname, NULL);
    373 		if (rval)
    374 			goto out;
    375 
    376 	} else {
    377 		/* print sensors for all devices registered */
    378 		iter = prop_dictionary_iterator(dict);
    379 		if (iter == NULL) {
    380 			rval = EINVAL;
    381 			goto out;
    382 		}
    383 
    384 		/* iterate over the dictionary returned by the kernel */
    385 		while ((obj = prop_object_iterator_next(iter)) != NULL) {
    386 			array = prop_dictionary_get_keysym(dict, obj);
    387 			if (prop_object_type(array) != PROP_TYPE_ARRAY) {
    388 				warnx("no sensors found");
    389 				rval = EINVAL;
    390 				goto out;
    391 			}
    392 
    393 			edp = calloc(1, sizeof(*edp));
    394 			if (!edp) {
    395 				rval = ENOMEM;
    396 				goto out;
    397 			}
    398 
    399 			dnp = prop_dictionary_keysym_cstring_nocopy(obj);
    400 			rval = find_sensors(array, dnp, edp);
    401 			if (rval)
    402 				goto out;
    403 
    404 			if (((flags & ENVSYS_LFLAG) == 0) &&
    405 			    (flags & ENVSYS_DFLAG)) {
    406 				(void)printf("%s (checking events every ",
    407 				    dnp);
    408 				if (edp->refresh_timo == 1)
    409 					(void)printf("second)\n");
    410 				else
    411 					(void)printf("%d seconds)\n",
    412 					    (int)edp->refresh_timo);
    413 			}
    414 
    415 			free(edp);
    416 			edp = NULL;
    417 		}
    418 		prop_object_iterator_release(iter);
    419 	}
    420 
    421 	/* print sensors now */
    422 	if (sensors) {
    423 		char *str = strdup(sensors);
    424 		if (!str) {
    425 			rval = ENOMEM;
    426 			goto out;
    427 		}
    428 		rval = check_sensors(str);
    429 		if (rval) {
    430 			free(str);
    431 			goto out;
    432 		}
    433 		free(str);
    434 	}
    435 	if ((flags & ENVSYS_LFLAG) == 0 && (flags & ENVSYS_DFLAG) == 0)
    436 		print_sensors();
    437 	if (interval)
    438 		(void)printf("\n");
    439 
    440 out:
    441 	while ((sensor = SIMPLEQ_FIRST(&sensors_list))) {
    442 		SIMPLEQ_REMOVE_HEAD(&sensors_list, entries);
    443 		free(sensor);
    444 	}
    445 	if (edp)
    446 		free(edp);
    447 	prop_object_release(dict);
    448 	return rval;
    449 }
    450 
    451 static int
    452 find_sensors(prop_array_t array, const char *dvname, dvprops_t edp)
    453 {
    454 	prop_object_iterator_t iter;
    455 	prop_object_t obj, obj1, obj2;
    456 	prop_string_t state, desc = NULL;
    457 	sensor_t sensor = NULL;
    458 	sensor_stats_t stats = NULL;
    459 
    460 	iter = prop_array_iterator(array);
    461 	if (!iter)
    462 		return ENOMEM;
    463 
    464 	/* iterate over the array of dictionaries */
    465 	while ((obj = prop_object_iterator_next(iter)) != NULL) {
    466 		/* get the refresh-timeout property */
    467 		obj2 = prop_dictionary_get(obj, "device-properties");
    468 		if (obj2) {
    469 			if (!edp)
    470 				continue;
    471 			if (!prop_dictionary_get_uint64(obj2,
    472 							"refresh-timeout",
    473 							&edp->refresh_timo))
    474 				continue;
    475 		}
    476 
    477 		/* new sensor coming */
    478 		sensor = calloc(1, sizeof(*sensor));
    479 		if (sensor == NULL) {
    480 			prop_object_iterator_release(iter);
    481 			return ENOMEM;
    482 		}
    483 
    484 		/* copy device name */
    485 		(void)strlcpy(sensor->dvname, dvname, sizeof(sensor->dvname));
    486 
    487 		/* description string */
    488 		desc = prop_dictionary_get(obj, "description");
    489 		if (desc) {
    490 			/* copy description */
    491 			(void)strlcpy(sensor->desc,
    492 			    prop_string_cstring_nocopy(desc),
    493 		    	    sizeof(sensor->desc));
    494 		} else {
    495 			free(sensor);
    496 			continue;
    497 		}
    498 
    499 		/* type string */
    500 		obj1  = prop_dictionary_get(obj, "type");
    501 		if (obj1) {
    502 			/* copy type */
    503 			(void)strlcpy(sensor->type,
    504 		    	    prop_string_cstring_nocopy(obj1),
    505 		    	    sizeof(sensor->type));
    506 		} else {
    507 			free(sensor);
    508 			continue;
    509 		}
    510 
    511 		/* check sensor's state */
    512 		state = prop_dictionary_get(obj, "state");
    513 
    514 		/* mark sensors with invalid/unknown state */
    515 		if ((prop_string_equals_cstring(state, "invalid") ||
    516 		     prop_string_equals_cstring(state, "unknown")))
    517 			sensor->invalid = true;
    518 
    519 		/* get current drive state string */
    520 		obj1 = prop_dictionary_get(obj, "drive-state");
    521 		if (obj1) {
    522 			(void)strlcpy(sensor->drvstate,
    523 			    prop_string_cstring_nocopy(obj1),
    524 			    sizeof(sensor->drvstate));
    525 		}
    526 
    527 		/* get current battery capacity string */
    528 		obj1 = prop_dictionary_get(obj, "battery-capacity");
    529 		if (obj1) {
    530 			(void)strlcpy(sensor->battcap,
    531 			    prop_string_cstring_nocopy(obj1),
    532 			    sizeof(sensor->battcap));
    533 		}
    534 
    535 		/* get current value */
    536 		obj1 = prop_dictionary_get(obj, "cur-value");
    537 		if (obj1)
    538 			sensor->cur_value = prop_number_integer_value(obj1);
    539 
    540 		/* get max value */
    541 		obj1 = prop_dictionary_get(obj, "max-value");
    542 		if (obj1)
    543 			sensor->max_value = prop_number_integer_value(obj1);
    544 
    545 		/* get min value */
    546 		obj1 = prop_dictionary_get(obj, "min-value");
    547 		if (obj1)
    548 			sensor->min_value = prop_number_integer_value(obj1);
    549 
    550 		/* get avg value */
    551 		obj1 = prop_dictionary_get(obj, "avg-value");
    552 		if (obj1)
    553 			sensor->avg_value = prop_number_integer_value(obj1);
    554 
    555 		/* get percentage flag */
    556 		obj1 = prop_dictionary_get(obj, "want-percentage");
    557 		if (obj1)
    558 			sensor->percentage = prop_bool_true(obj1);
    559 
    560 		/* get critical max value if available */
    561 		obj1 = prop_dictionary_get(obj, "critical-max");
    562 		if (obj1)
    563 			sensor->critmax_value = prop_number_integer_value(obj1);
    564 
    565 		/* get critical min value if available */
    566 		obj1 = prop_dictionary_get(obj, "critical-min");
    567 		if (obj1)
    568 			sensor->critmin_value = prop_number_integer_value(obj1);
    569 
    570 		/* get critical capacity value if available */
    571 		obj1 = prop_dictionary_get(obj, "critical-capacity");
    572 		if (obj1)
    573 			sensor->critcap_value = prop_number_integer_value(obj1);
    574 
    575 		/* print sensor names if -l was given */
    576 		if (flags & ENVSYS_LFLAG) {
    577 			if (width)
    578 				(void)printf("%*s\n", width,
    579 				    prop_string_cstring_nocopy(desc));
    580 			else
    581 				(void)printf("%s\n",
    582 				    prop_string_cstring_nocopy(desc));
    583 		}
    584 
    585 		/* Add the sensor into the list */
    586 		SIMPLEQ_INSERT_TAIL(&sensors_list, sensor, entries);
    587 
    588 		/* Collect statistics if flag enabled */
    589 		if (statistics) {
    590 			/* ignore sensors not relevant for statistics */
    591 			if ((strcmp(sensor->type, "Indicator") == 0) ||
    592 			    (strcmp(sensor->type, "Battery charge") == 0) ||
    593 			    (strcmp(sensor->type, "Drive") == 0))
    594 				continue;
    595 
    596 			/* ignore invalid data */
    597 			if (sensor->invalid || !sensor->cur_value)
    598 				continue;
    599 
    600 			/* find or allocate a new statistics sensor */
    601 			stats = find_stats_sensor(sensor->desc);
    602 			if (stats == NULL) {
    603 				free(sensor);
    604 				prop_object_iterator_release(iter);
    605 				return ENOMEM;
    606 			}
    607 
    608 			/* collect data */
    609 			if (!stats->max)
    610 				stats->max = sensor->cur_value;
    611 			if (!stats->min)
    612 				stats->min = sensor->cur_value;
    613 
    614 			if (sensor->cur_value > stats->max)
    615 				stats->max = sensor->cur_value;
    616 
    617 			if (sensor->cur_value < stats->min)
    618 				stats->min = sensor->cur_value;
    619 
    620 			/* compute avg value */
    621 			if (stats->max && stats->min)
    622 				stats->avg =
    623 				    (sensor->cur_value + stats->max +
    624 				    stats->min) / 3;
    625 		}
    626 	}
    627 
    628 	/* free memory */
    629 	prop_object_iterator_release(iter);
    630 	return 0;
    631 }
    632 
    633 static int
    634 check_sensors(char *str)
    635 {
    636 	sensor_t sensor = NULL;
    637 	char *dvstring, *sstring, *p, *last;
    638 	bool sensor_found = false;
    639 
    640 	/*
    641 	 * Parse device name and sensor description and find out
    642 	 * if the sensor is valid.
    643 	 */
    644 	for ((p = strtok_r(str, ",", &last)); p;
    645 	     (p = strtok_r(NULL, ",", &last))) {
    646 		/* get device name */
    647 		dvstring = strtok(p, ":");
    648 		if (dvstring == NULL) {
    649 			warnx("missing device name");
    650 			return EINVAL;
    651 		}
    652 
    653 		/* get sensor description */
    654 		sstring = strtok(NULL, ":");
    655 		if (sstring == NULL) {
    656 			warnx("missing sensor description");
    657 			return EINVAL;
    658 		}
    659 
    660 		SIMPLEQ_FOREACH(sensor, &sensors_list, entries) {
    661 			/* skip until we match device */
    662 			if (strcmp(dvstring, sensor->dvname))
    663 				continue;
    664 			if (strcmp(sstring, sensor->desc) == 0) {
    665 				sensor->visible = true;
    666 				sensor_found = true;
    667 				break;
    668 			}
    669 		}
    670 		if (sensor_found == false) {
    671 			warnx("unknown sensor `%s' for device `%s'",
    672 		       	    sstring, dvstring);
    673 			return EINVAL;
    674 		}
    675 		sensor_found = false;
    676 	}
    677 
    678 	/* check if all sensors were ok, and error out if not */
    679 	SIMPLEQ_FOREACH(sensor, &sensors_list, entries)
    680 		if (sensor->visible)
    681 			return 0;
    682 
    683 	warnx("no sensors selected to display");
    684 	return EINVAL;
    685 }
    686 
    687 static void
    688 print_sensors(void)
    689 {
    690 	sensor_t sensor;
    691 	sensor_stats_t stats = NULL;
    692 	size_t maxlen = 0, ilen = 32 + 3;
    693 	double temp = 0;
    694 	const char *invalid = "N/A", *degrees, *tmpstr, *stype;
    695 	const char *a, *b, *c, *d, *units;
    696 
    697 	tmpstr = stype = d = NULL;
    698 
    699 	/* find the longest description */
    700 	SIMPLEQ_FOREACH(sensor, &sensors_list, entries)
    701 		if (strlen(sensor->desc) > maxlen)
    702 			maxlen = strlen(sensor->desc);
    703 
    704 	if (width)
    705 		maxlen = width;
    706 
    707 	/*
    708 	 * Print a header at the bottom only once showing different
    709 	 * members if the statistics flag is set or not.
    710 	 *
    711 	 * As bonus if -s is set, only print this header every 10 iterations
    712 	 * to avoid redundancy... like vmstat(1).
    713 	 */
    714 
    715 	a = "Current";
    716 	units = "Unit";
    717 	if (statistics) {
    718 		b = "Max";
    719 		c = "Min";
    720 		d = "Avg";
    721 	} else {
    722 		b = "CritMax";
    723 		c = "CritMin";
    724 		d = "CritCap";
    725 	}
    726 
    727 	if (!sensors || (!header_passes && sensors) ||
    728 	    (header_passes == 10 && sensors)) {
    729 		(void)printf("%s%*s  %10s %8s %8s %8s %8s\n",
    730 		    mydevname ? "" : "  ", (int)maxlen,
    731 		    "", a, b, c, d, units);
    732 		if (sensors && header_passes == 10)
    733 			header_passes = 0;
    734 	}
    735 	if (sensors)
    736 		header_passes++;
    737 
    738 	/* print the sensors */
    739 	SIMPLEQ_FOREACH(sensor, &sensors_list, entries) {
    740 		/* skip sensors that were not marked as visible */
    741 		if (sensors && !sensor->visible)
    742 			continue;
    743 
    744 		/* skip invalid sensors if -I is set */
    745 		if ((flags & ENVSYS_IFLAG) && sensor->invalid)
    746 			continue;
    747 
    748 		/* print device name */
    749 		if (!mydevname) {
    750 			if (tmpstr == NULL || strcmp(tmpstr, sensor->dvname))
    751 				printf("[%s]\n", sensor->dvname);
    752 
    753 			tmpstr = sensor->dvname;
    754 		}
    755 
    756 		/* find out the statistics sensor */
    757 		if (statistics) {
    758 			stats = find_stats_sensor(sensor->desc);
    759 			if (stats == NULL) {
    760 				/* No statistics for this sensor */
    761 				continue;
    762 			}
    763 		}
    764 
    765 		/* print sensor description */
    766 		(void)printf("%s%*.*s", mydevname ? "" : "  ", (int)maxlen,
    767 		    (int)maxlen, sensor->desc);
    768 
    769 		/* print invalid string */
    770 		if (sensor->invalid) {
    771 			(void)printf(": %10s\n", invalid);
    772 			continue;
    773 		}
    774 
    775 		/*
    776 		 * Indicator and Battery charge sensors.
    777 		 */
    778 		if ((strcmp(sensor->type, "Indicator") == 0) ||
    779 		    (strcmp(sensor->type, "Battery charge") == 0)) {
    780 
    781 			(void)printf(": %10s", sensor->cur_value ? "ON" : "OFF");
    782 
    783 /* converts the value to degC or degF */
    784 #define CONVERTTEMP(a, b, c)					\
    785 do {								\
    786 	if (b) 							\
    787 		(a) = ((b) / 1000000.0) - 273.15;		\
    788 	if (flags & ENVSYS_FFLAG) {				\
    789 		if (b)						\
    790 			(a) = (9.0 / 5.0) * (a) + 32.0;		\
    791 		(c) = "degF";					\
    792 	} else							\
    793 		(c) = "degC";					\
    794 } while (/* CONSTCOND */ 0)
    795 
    796 
    797 		/* temperatures */
    798 		} else if (strcmp(sensor->type, "Temperature") == 0) {
    799 
    800 			CONVERTTEMP(temp, sensor->cur_value, degrees);
    801 			stype = degrees;
    802 			(void)printf(": %10.3f ", temp);
    803 
    804 			if (statistics) {
    805 				/* show statistics if flag set */
    806 				CONVERTTEMP(temp, stats->max, degrees);
    807 				(void)printf("%8.3f ", temp);
    808 				CONVERTTEMP(temp, stats->min, degrees);
    809 				(void)printf("%8.3f ", temp);
    810 				CONVERTTEMP(temp, stats->avg, degrees);
    811 				(void)printf("%8.3f ", temp);
    812 				ilen = 8;
    813 			} else {
    814 				if (sensor->critmax_value) {
    815 					CONVERTTEMP(temp,
    816 					    sensor->critmax_value, degrees);
    817 					(void)printf( "%8.3f ", temp);
    818 					ilen = 24 + 2;
    819 				}
    820 
    821 				if (sensor->critmin_value) {
    822 					CONVERTTEMP(temp,
    823 					    sensor->critmin_value, degrees);
    824 					if (sensor->critmax_value)
    825 						ilen = 8;
    826 					else
    827 						ilen = 16 + 1;
    828 
    829 					(void)printf("%*.3f ", (int)ilen, temp);
    830 					ilen = 16 + 1;
    831 				}
    832 			}
    833 
    834 			(void)printf("%*s", (int)ilen, stype);
    835 #undef CONVERTTEMP
    836 
    837 		/* fans */
    838 		} else if (strcmp(sensor->type, "Fan") == 0) {
    839 			stype = "RPM";
    840 
    841 			(void)printf(": %10u ", sensor->cur_value);
    842 			if (statistics) {
    843 				/* show statistics if flag set */
    844 				(void)printf("%8u %8u %8u ",
    845 				    stats->max, stats->min, stats->avg);
    846 				ilen = 8;
    847 			} else {
    848 				if (sensor->critmax_value) {
    849 					(void)printf("%8u ",
    850 					    sensor->critmax_value);
    851 					ilen = 24 + 2;
    852 				}
    853 
    854 				if (sensor->critmin_value) {
    855 					if (sensor->critmax_value)
    856 						ilen = 8;
    857 					else
    858 						ilen = 16 + 1;
    859 					(void)printf("%*u ", (int)ilen,
    860 					    sensor->critmin_value);
    861 					ilen = 16 + 1;
    862 				}
    863 			}
    864 
    865 			(void)printf("%*s", (int)ilen, stype);
    866 
    867 		/* integers */
    868 		} else if (strcmp(sensor->type, "Integer") == 0) {
    869 
    870 			(void)printf(": %10d", sensor->cur_value);
    871 
    872 		/* drives  */
    873 		} else if (strcmp(sensor->type, "Drive") == 0) {
    874 
    875 			(void)printf(": %10s", sensor->drvstate);
    876 
    877 		/* Battery capacity */
    878 		} else if (strcmp(sensor->type, "Battery capacity") == 0) {
    879 
    880 			(void)printf(": %10s", sensor->battcap);
    881 
    882 		/* everything else */
    883 		} else {
    884 			if (strcmp(sensor->type, "Voltage DC") == 0)
    885 				stype = "V";
    886 			else if (strcmp(sensor->type, "Voltage AC") == 0)
    887 				stype = "VAC";
    888 			else if (strcmp(sensor->type, "Ampere") == 0)
    889 				stype = "A";
    890 			else if (strcmp(sensor->type, "Watts") == 0)
    891 				stype = "W";
    892 			else if (strcmp(sensor->type, "Ohms") == 0)
    893 				stype = "Ohms";
    894 			else if (strcmp(sensor->type, "Watt hour") == 0)
    895 				stype = "Wh";
    896 			else if (strcmp(sensor->type, "Ampere hour") == 0)
    897 				stype = "Ah";
    898 
    899 			(void)printf(": %10.3f ",
    900 			    sensor->cur_value / 1000000.0);
    901 
    902 			if (!statistics) {
    903 				if (sensor->critmax_value) {
    904 					(void)printf("%8.3f ",
    905 					    sensor->critmax_value / 1000000.0);
    906 					ilen = 24 + 2;
    907 				}
    908 
    909 				if (sensor->critmin_value) {
    910 					if (sensor->critmax_value)
    911 						ilen = 8;
    912 					else
    913 						ilen = 16 + 1;
    914 					(void)printf("%*.3f ", (int)ilen,
    915 					    sensor->critmin_value / 1000000.0);
    916 					ilen = 16 + 1;
    917 				}
    918 
    919 				if (sensor->critcap_value) {
    920 					ilen = 24 + 2;
    921 					(void)printf("%*.2f%% ", (int)ilen,
    922 					    (sensor->critcap_value * 100.0) /
    923 					    sensor->max_value);
    924 					ilen = 8;
    925 				}
    926 			}
    927 
    928 			if (statistics && !sensor->percentage) {
    929 				/* show statistics if flag set */
    930 				(void)printf("%8.3f %8.3f %8.3f ",
    931 				    stats->max / 1000000.0,
    932 				    stats->min / 1000000.0,
    933 				    stats->avg / 1000000.0);
    934 				ilen = 8;
    935 			}
    936 
    937 			(void)printf("%*s", (int)ilen, stype);
    938 			if (sensor->percentage && sensor->max_value) {
    939 				(void)printf("  (%5.2f%%)",
    940 				    (sensor->cur_value * 100.0) /
    941 				    sensor->max_value);
    942 			}
    943 		}
    944 		(void)printf("\n");
    945 		ilen = 32 + 3;
    946 	}
    947 }
    948 
    949 static int
    950 usage(void)
    951 {
    952 	(void)fprintf(stderr, "Usage: %s [-DfIlrSTx] ", getprogname());
    953 	(void)fprintf(stderr, "[-c file] [-d device] [-i interval] ");
    954 	(void)fprintf(stderr, "[-s device:sensor,...] [-w width]\n");
    955 	exit(EXIT_FAILURE);
    956 	/* NOTREACHED */
    957 }
    958