xref: /freebsd/sbin/sysctl/sysctl.c (revision 99f6b270)
1 /*
2  * Copyright (c) 1993
3  *	The Regents of the University of California.  All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  * 4. Neither the name of the University nor the names of its contributors
14  *    may be used to endorse or promote products derived from this software
15  *    without specific prior written permission.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27  * SUCH DAMAGE.
28  */
29 
30 #ifndef lint
31 static const char copyright[] =
32 "@(#) Copyright (c) 1993\n\
33 	The Regents of the University of California.  All rights reserved.\n";
34 #endif /* not lint */
35 
36 #ifndef lint
37 #if 0
38 static char sccsid[] = "@(#)from: sysctl.c	8.1 (Berkeley) 6/6/93";
39 #endif
40 static const char rcsid[] =
41   "$FreeBSD$";
42 #endif /* not lint */
43 
44 #include <sys/param.h>
45 #include <sys/time.h>
46 #include <sys/resource.h>
47 #include <sys/sensors.h>
48 #include <sys/stat.h>
49 #include <sys/sysctl.h>
50 #include <sys/vmmeter.h>
51 
52 #include <ctype.h>
53 #include <err.h>
54 #include <errno.h>
55 #include <inttypes.h>
56 #include <locale.h>
57 #include <stdio.h>
58 #include <stdlib.h>
59 #include <string.h>
60 #include <unistd.h>
61 
62 static int	aflag, bflag, dflag, eflag, hflag, Nflag, nflag, oflag;
63 static int	qflag, xflag;
64 
65 static int	oidfmt(int *, int, char *, u_int *);
66 static void	parse(char *);
67 static int	show_var(int *, int);
68 static int	sysctl_all(int *oid, int len);
69 static int	name2oid(char *, int *);
70 
71 static void	set_T_dev_t(char *, void **, size_t *);
72 static int	set_IK(char *, int *);
73 
74 static void
75 usage(void)
76 {
77 
78 	(void)fprintf(stderr, "%s\n%s\n",
79 	    "usage: sysctl [-bdehNnoqx] name[=value] ...",
80 	    "       sysctl [-bdehNnoqx] -a");
81 	exit(1);
82 }
83 
84 int
85 main(int argc, char **argv)
86 {
87 	int ch;
88 
89 	setlocale(LC_NUMERIC, "");
90 	setbuf(stdout,0);
91 	setbuf(stderr,0);
92 
93 	while ((ch = getopt(argc, argv, "AabdehNnoqwxX")) != -1) {
94 		switch (ch) {
95 		case 'A':
96 			/* compatibility */
97 			aflag = oflag = 1;
98 			break;
99 		case 'a':
100 			aflag = 1;
101 			break;
102 		case 'b':
103 			bflag = 1;
104 			break;
105 		case 'd':
106 			dflag = 1;
107 			break;
108 		case 'e':
109 			eflag = 1;
110 			break;
111 		case 'h':
112 			hflag = 1;
113 			break;
114 		case 'N':
115 			Nflag = 1;
116 			break;
117 		case 'n':
118 			nflag = 1;
119 			break;
120 		case 'o':
121 			oflag = 1;
122 			break;
123 		case 'q':
124 			qflag = 1;
125 			break;
126 		case 'w':
127 			/* compatibility */
128 			/* ignored */
129 			break;
130 		case 'X':
131 			/* compatibility */
132 			aflag = xflag = 1;
133 			break;
134 		case 'x':
135 			xflag = 1;
136 			break;
137 		default:
138 			usage();
139 		}
140 	}
141 	argc -= optind;
142 	argv += optind;
143 
144 	if (Nflag && nflag)
145 		usage();
146 	if (aflag && argc == 0)
147 		exit(sysctl_all(0, 0));
148 	if (argc == 0)
149 		usage();
150 	while (argc-- > 0)
151 		parse(*argv++);
152 	exit(0);
153 }
154 
155 /*
156  * Parse a name into a MIB entry.
157  * Lookup and print out the MIB entry if it exists.
158  * Set a new value if requested.
159  */
160 static void
161 parse(char *string)
162 {
163 	int len, i, j;
164 	void *newval = 0;
165 	int intval;
166 	unsigned int uintval;
167 	long longval;
168 	unsigned long ulongval;
169 	size_t newsize = 0;
170 	quad_t quadval;
171 	int mib[CTL_MAXNAME];
172 	char *cp, *bufp, buf[BUFSIZ], *endptr, fmt[BUFSIZ];
173 	u_int kind;
174 
175 	bufp = buf;
176 	if (snprintf(buf, BUFSIZ, "%s", string) >= BUFSIZ)
177 		errx(1, "oid too long: '%s'", string);
178 	if ((cp = strchr(string, '=')) != NULL) {
179 		*strchr(buf, '=') = '\0';
180 		*cp++ = '\0';
181 		while (isspace(*cp))
182 			cp++;
183 		newval = cp;
184 		newsize = strlen(cp);
185 	}
186 	len = name2oid(bufp, mib);
187 
188 	if (len < 0) {
189 		if (qflag)
190 			exit(1);
191 		else
192 			errx(1, "unknown oid '%s'", bufp);
193 	}
194 
195 	if (oidfmt(mib, len, fmt, &kind))
196 		err(1, "couldn't find format of oid '%s'", bufp);
197 
198 	if (newval == NULL) {
199 		if ((kind & CTLTYPE) == CTLTYPE_NODE) {
200 			if (dflag) {
201 				i = show_var(mib, len);
202 				if (!i && !bflag)
203 					putchar('\n');
204 			}
205 			sysctl_all(mib, len);
206 		} else {
207 			i = show_var(mib, len);
208 			if (!i && !bflag)
209 				putchar('\n');
210 		}
211 	} else {
212 		if ((kind & CTLTYPE) == CTLTYPE_NODE)
213 			errx(1, "oid '%s' isn't a leaf node", bufp);
214 
215 		if (!(kind & CTLFLAG_WR)) {
216 			if (kind & CTLFLAG_TUN) {
217 				warnx("oid '%s' is a read only tunable", bufp);
218 				errx(1, "Tunable values are set in /boot/loader.conf");
219 			} else {
220 				errx(1, "oid '%s' is read only", bufp);
221 			}
222 		}
223 
224 		if ((kind & CTLTYPE) == CTLTYPE_INT ||
225 		    (kind & CTLTYPE) == CTLTYPE_UINT ||
226 		    (kind & CTLTYPE) == CTLTYPE_LONG ||
227 		    (kind & CTLTYPE) == CTLTYPE_ULONG ||
228 		    (kind & CTLTYPE) == CTLTYPE_QUAD) {
229 			if (strlen(newval) == 0)
230 				errx(1, "empty numeric value");
231 		}
232 
233 		switch (kind & CTLTYPE) {
234 			case CTLTYPE_INT:
235 				if (strcmp(fmt, "IK") == 0) {
236 					if (!set_IK(newval, &intval))
237 						errx(1, "invalid value '%s'",
238 						    (char *)newval);
239  				} else {
240 					intval = (int)strtol(newval, &endptr,
241 					    0);
242 					if (endptr == newval || *endptr != '\0')
243 						errx(1, "invalid integer '%s'",
244 						    (char *)newval);
245 				}
246 				newval = &intval;
247 				newsize = sizeof(intval);
248 				break;
249 			case CTLTYPE_UINT:
250 				uintval = (int) strtoul(newval, &endptr, 0);
251 				if (endptr == newval || *endptr != '\0')
252 					errx(1, "invalid unsigned integer '%s'",
253 					    (char *)newval);
254 				newval = &uintval;
255 				newsize = sizeof(uintval);
256 				break;
257 			case CTLTYPE_LONG:
258 				longval = strtol(newval, &endptr, 0);
259 				if (endptr == newval || *endptr != '\0')
260 					errx(1, "invalid long integer '%s'",
261 					    (char *)newval);
262 				newval = &longval;
263 				newsize = sizeof(longval);
264 				break;
265 			case CTLTYPE_ULONG:
266 				ulongval = strtoul(newval, &endptr, 0);
267 				if (endptr == newval || *endptr != '\0')
268 					errx(1, "invalid unsigned long integer"
269 					    " '%s'", (char *)newval);
270 				newval = &ulongval;
271 				newsize = sizeof(ulongval);
272 				break;
273 			case CTLTYPE_STRING:
274 				break;
275 			case CTLTYPE_QUAD:
276 				sscanf(newval, "%qd", &quadval);
277 				newval = &quadval;
278 				newsize = sizeof(quadval);
279 				break;
280 			case CTLTYPE_OPAQUE:
281 				if (strcmp(fmt, "T,dev_t") == 0) {
282 					set_T_dev_t (newval, &newval, &newsize);
283 					break;
284 				}
285 				/* FALLTHROUGH */
286 			default:
287 				errx(1, "oid '%s' is type %d,"
288 					" cannot set that", bufp,
289 					kind & CTLTYPE);
290 		}
291 
292 		i = show_var(mib, len);
293 		if (sysctl(mib, len, 0, 0, newval, newsize) == -1) {
294 			if (!i && !bflag)
295 				putchar('\n');
296 			switch (errno) {
297 			case EOPNOTSUPP:
298 				errx(1, "%s: value is not available",
299 					string);
300 			case ENOTDIR:
301 				errx(1, "%s: specification is incomplete",
302 					string);
303 			case ENOMEM:
304 				errx(1, "%s: type is unknown to this program",
305 					string);
306 			default:
307 				warn("%s", string);
308 				return;
309 			}
310 		}
311 		if (!bflag)
312 			printf(" -> ");
313 		i = nflag;
314 		nflag = 1;
315 		j = show_var(mib, len);
316 		if (!j && !bflag)
317 			putchar('\n');
318 		nflag = i;
319 	}
320 }
321 
322 /* These functions will dump out various interesting structures. */
323 
324 static int
325 S_clockinfo(int l2, void *p)
326 {
327 	struct clockinfo *ci = (struct clockinfo*)p;
328 
329 	if (l2 != sizeof(*ci)) {
330 		warnx("S_clockinfo %d != %d", l2, sizeof(*ci));
331 		return (1);
332 	}
333 	printf(hflag ? "{ hz = %'d, tick = %'d, profhz = %'d, stathz = %'d }" :
334 		"{ hz = %d, tick = %d, profhz = %d, stathz = %d }",
335 		ci->hz, ci->tick, ci->profhz, ci->stathz);
336 	return (0);
337 }
338 
339 static int
340 S_loadavg(int l2, void *p)
341 {
342 	struct loadavg *tv = (struct loadavg*)p;
343 
344 	if (l2 != sizeof(*tv)) {
345 		warnx("S_loadavg %d != %d", l2, sizeof(*tv));
346 		return (1);
347 	}
348 	printf(hflag ? "{ %'.2f %'.2f %'.2f }" : "{ %.2f %.2f %.2f }",
349 		(double)tv->ldavg[0]/(double)tv->fscale,
350 		(double)tv->ldavg[1]/(double)tv->fscale,
351 		(double)tv->ldavg[2]/(double)tv->fscale);
352 	return (0);
353 }
354 
355 static int
356 S_timeval(int l2, void *p)
357 {
358 	struct timeval *tv = (struct timeval*)p;
359 	time_t tv_sec;
360 	char *p1, *p2;
361 
362 	if (l2 != sizeof(*tv)) {
363 		warnx("S_timeval %d != %d", l2, sizeof(*tv));
364 		return (1);
365 	}
366 	printf(hflag ? "{ sec = %'ld, usec = %'ld } " :
367 		"{ sec = %ld, usec = %ld } ",
368 		tv->tv_sec, tv->tv_usec);
369 	tv_sec = tv->tv_sec;
370 	p1 = strdup(ctime(&tv_sec));
371 	for (p2=p1; *p2 ; p2++)
372 		if (*p2 == '\n')
373 			*p2 = '\0';
374 	fputs(p1, stdout);
375 	return (0);
376 }
377 
378 static int
379 S_vmtotal(int l2, void *p)
380 {
381 	struct vmtotal *v = (struct vmtotal *)p;
382 	int pageKilo = getpagesize() / 1024;
383 
384 	if (l2 != sizeof(*v)) {
385 		warnx("S_vmtotal %d != %d", l2, sizeof(*v));
386 		return (1);
387 	}
388 
389 	printf(
390 	    "\nSystem wide totals computed every five seconds:"
391 	    " (values in kilobytes)\n");
392 	printf("===============================================\n");
393 	printf(
394 	    "Processes:\t\t(RUNQ: %hd Disk Wait: %hd Page Wait: "
395 	    "%hd Sleep: %hd)\n",
396 	    v->t_rq, v->t_dw, v->t_pw, v->t_sl);
397 	printf(
398 	    "Virtual Memory:\t\t(Total: %dK, Active %dK)\n",
399 	    v->t_vm * pageKilo, v->t_avm * pageKilo);
400 	printf("Real Memory:\t\t(Total: %dK Active %dK)\n",
401 	    v->t_rm * pageKilo, v->t_arm * pageKilo);
402 	printf("Shared Virtual Memory:\t(Total: %dK Active: %dK)\n",
403 	    v->t_vmshr * pageKilo, v->t_avmshr * pageKilo);
404 	printf("Shared Real Memory:\t(Total: %dK Active: %dK)\n",
405 	    v->t_rmshr * pageKilo, v->t_armshr * pageKilo);
406 	printf("Free Memory Pages:\t%dK\n", v->t_free * pageKilo);
407 
408 	return (0);
409 }
410 
411 static int
412 S_sensor(int l2, void *p)
413 {
414 	struct sensor *s = (struct sensor *)p;
415 
416 	if (l2 != sizeof(*s)) {
417 		warnx("S_sensor %d != %d", l2, sizeof(*s));
418 		return (1);
419 	}
420 
421 	if (s->flags & SENSOR_FINVALID) {
422 		/*
423 		 * XXX: with this flag, the node should be entirely ignored,
424 		 * but as the magic-based sysctl(8) is not too flexible, we
425 		 * simply have to print out that the sensor is invalid.
426 		 */
427 		printf("invalid");
428 		return (0);
429 	}
430 
431 	if (s->flags & SENSOR_FUNKNOWN)
432 		printf("unknown");
433 	else {
434 		switch (s->type) {
435 		case SENSOR_TEMP:
436 			printf("%.2f degC",
437 			    (s->value - 273150000) / 1000000.0);
438 			break;
439 		case SENSOR_FANRPM:
440 			printf("%lld RPM", s->value);
441 			break;
442 		case SENSOR_VOLTS_DC:
443 			printf("%.2f VDC", s->value / 1000000.0);
444 			break;
445 		case SENSOR_AMPS:
446 			printf("%.2f A", s->value / 1000000.0);
447 			break;
448 		case SENSOR_WATTHOUR:
449 			printf("%.2f Wh", s->value / 1000000.0);
450 			break;
451 		case SENSOR_AMPHOUR:
452 			printf("%.2f Ah", s->value / 1000000.0);
453 			break;
454 		case SENSOR_INDICATOR:
455 			printf("%s", s->value ? "On" : "Off");
456 			break;
457 		case SENSOR_INTEGER:
458 			printf("%lld", s->value);
459 			break;
460 		case SENSOR_PERCENT:
461 			printf("%.2f%%", s->value / 1000.0);
462 			break;
463 		case SENSOR_LUX:
464 			printf("%.2f lx", s->value / 1000000.0);
465 			break;
466 		case SENSOR_DRIVE:
467 		{
468 			const char *name;
469 
470 			switch (s->value) {
471 			case SENSOR_DRIVE_EMPTY:
472 				name = "empty";
473 				break;
474 			case SENSOR_DRIVE_READY:
475 				name = "ready";
476 				break;
477 			case SENSOR_DRIVE_POWERUP:
478 				name = "powering up";
479 				break;
480 			case SENSOR_DRIVE_ONLINE:
481 				name = "online";
482 				break;
483 			case SENSOR_DRIVE_IDLE:
484 				name = "idle";
485 				break;
486 			case SENSOR_DRIVE_ACTIVE:
487 				name = "active";
488 				break;
489 			case SENSOR_DRIVE_REBUILD:
490 				name = "rebuilding";
491 				break;
492 			case SENSOR_DRIVE_POWERDOWN:
493 				name = "powering down";
494 				break;
495 			case SENSOR_DRIVE_FAIL:
496 				name = "failed";
497 				break;
498 			case SENSOR_DRIVE_PFAIL:
499 				name = "degraded";
500 				break;
501 			default:
502 				name = "unknown";
503 				break;
504 			}
505 			printf(name);
506 			break;
507 		}
508 		case SENSOR_TIMEDELTA:
509 			printf("%.6f secs", s->value / 1000000000.0);
510 			break;
511 		default:
512 			printf("unknown");
513 		}
514 	}
515 
516 	if (s->desc[0] != '\0')
517 		printf(" (%s)", s->desc);
518 
519 	switch (s->status) {
520 	case SENSOR_S_UNSPEC:
521 		break;
522 	case SENSOR_S_OK:
523 		printf(", OK");
524 		break;
525 	case SENSOR_S_WARN:
526 		printf(", WARNING");
527 		break;
528 	case SENSOR_S_CRIT:
529 		printf(", CRITICAL");
530 		break;
531 	case SENSOR_S_UNKNOWN:
532 		printf(", UNKNOWN");
533 		break;
534 	}
535 
536 	if (s->tv.tv_sec) {
537 		time_t t = s->tv.tv_sec;
538 		char ct[26];
539 
540 		ctime_r(&t, ct);
541 		ct[19] = '\0';
542 		printf(", %s.%03ld", ct, s->tv.tv_usec / 1000);
543 	}
544 
545 	return (0);
546 }
547 
548 static int
549 T_dev_t(int l2, void *p)
550 {
551 	dev_t *d = (dev_t *)p;
552 
553 	if (l2 != sizeof(*d)) {
554 		warnx("T_dev_T %d != %d", l2, sizeof(*d));
555 		return (1);
556 	}
557 	if ((int)(*d) != -1) {
558 		if (minor(*d) > 255 || minor(*d) < 0)
559 			printf("{ major = %d, minor = 0x%x }",
560 				major(*d), minor(*d));
561 		else
562 			printf("{ major = %d, minor = %d }",
563 				major(*d), minor(*d));
564 	}
565 	return (0);
566 }
567 
568 static void
569 set_T_dev_t(char *path, void **val, size_t *size)
570 {
571 	static struct stat statb;
572 
573 	if (strcmp(path, "none") && strcmp(path, "off")) {
574 		int rc = stat (path, &statb);
575 		if (rc) {
576 			err(1, "cannot stat %s", path);
577 		}
578 
579 		if (!S_ISCHR(statb.st_mode)) {
580 			errx(1, "must specify a device special file.");
581 		}
582 	} else {
583 		statb.st_rdev = NODEV;
584 	}
585 	*val = (void *) &statb.st_rdev;
586 	*size = sizeof(statb.st_rdev);
587 }
588 
589 static int
590 set_IK(char *str, int *val)
591 {
592 	float temp;
593 	int len, kelv;
594 	char *p, *endptr;
595 
596 	if ((len = strlen(str)) == 0)
597 		return (0);
598 	p = &str[len - 1];
599 	if (*p == 'C' || *p == 'F') {
600 		*p = '\0';
601 		temp = strtof(str, &endptr);
602 		if (endptr == str || *endptr != '\0')
603 			return (0);
604 		if (*p == 'F')
605 			temp = (temp - 32) * 5 / 9;
606 		kelv = temp * 10 + 2732;
607 	} else {
608 		kelv = (int)strtol(str, &endptr, 10);
609 		if (endptr == str || *endptr != '\0')
610 			return (0);
611 	}
612 	*val = kelv;
613 	return (1);
614 }
615 
616 /*
617  * These functions uses a presently undocumented interface to the kernel
618  * to walk the tree and get the type so it can print the value.
619  * This interface is under work and consideration, and should probably
620  * be killed with a big axe by the first person who can find the time.
621  * (be aware though, that the proper interface isn't as obvious as it
622  * may seem, there are various conflicting requirements.
623  */
624 
625 static int
626 name2oid(char *name, int *oidp)
627 {
628 	int oid[2];
629 	int i;
630 	size_t j;
631 
632 	oid[0] = 0;
633 	oid[1] = 3;
634 
635 	j = CTL_MAXNAME * sizeof(int);
636 	i = sysctl(oid, 2, oidp, &j, name, strlen(name));
637 	if (i < 0)
638 		return (i);
639 	j /= sizeof(int);
640 	return (j);
641 }
642 
643 static int
644 oidfmt(int *oid, int len, char *fmt, u_int *kind)
645 {
646 	int qoid[CTL_MAXNAME+2];
647 	u_char buf[BUFSIZ];
648 	int i;
649 	size_t j;
650 
651 	qoid[0] = 0;
652 	qoid[1] = 4;
653 	memcpy(qoid + 2, oid, len * sizeof(int));
654 
655 	j = sizeof(buf);
656 	i = sysctl(qoid, len + 2, buf, &j, 0, 0);
657 	if (i)
658 		err(1, "sysctl fmt %d %d %d", i, j, errno);
659 
660 	if (kind)
661 		*kind = *(u_int *)buf;
662 
663 	if (fmt)
664 		strcpy(fmt, (char *)(buf + sizeof(u_int)));
665 	return (0);
666 }
667 
668 /*
669  * This formats and outputs the value of one variable
670  *
671  * Returns zero if anything was actually output.
672  * Returns one if didn't know what to do with this.
673  * Return minus one if we had errors.
674  */
675 
676 static int
677 show_var(int *oid, int nlen)
678 {
679 	u_char buf[BUFSIZ], *val, *oval, *p;
680 	char name[BUFSIZ], *fmt;
681 	const char *sep, *sep1;
682 	int qoid[CTL_MAXNAME+2];
683 	uintmax_t umv;
684 	intmax_t mv;
685 	int i, hexlen;
686 	size_t intlen;
687 	size_t j, len;
688 	u_int kind;
689 	int (*func)(int, void *);
690 
691 	bzero(buf, BUFSIZ);
692 	bzero(name, BUFSIZ);
693 	qoid[0] = 0;
694 	memcpy(qoid + 2, oid, nlen * sizeof(int));
695 
696 	qoid[1] = 1;
697 	j = sizeof(name);
698 	i = sysctl(qoid, nlen + 2, name, &j, 0, 0);
699 	if (i || !j)
700 		err(1, "sysctl name %d %d %d", i, j, errno);
701 
702 	if (Nflag) {
703 		printf("%s", name);
704 		return (0);
705 	}
706 
707 	if (eflag)
708 		sep = "=";
709 	else
710 		sep = ": ";
711 
712 	if (dflag) {	/* just print description */
713 		qoid[1] = 5;
714 		j = sizeof(buf);
715 		i = sysctl(qoid, nlen + 2, buf, &j, 0, 0);
716 		if (!nflag)
717 			printf("%s%s", name, sep);
718 		printf("%s", buf);
719 		return (0);
720 	}
721 	/* find an estimate of how much we need for this var */
722 	j = 0;
723 	i = sysctl(oid, nlen, 0, &j, 0, 0);
724 	j += j; /* we want to be sure :-) */
725 
726 	val = oval = malloc(j + 1);
727 	if (val == NULL) {
728 		warnx("malloc failed");
729 		return (1);
730 	}
731 	len = j;
732 	i = sysctl(oid, nlen, val, &len, 0, 0);
733 	if (i || !len) {
734 		free(oval);
735 		return (1);
736 	}
737 
738 	if (bflag) {
739 		fwrite(val, 1, len, stdout);
740 		free(oval);
741 		return (0);
742 	}
743 	val[len] = '\0';
744 	fmt = buf;
745 	oidfmt(oid, nlen, fmt, &kind);
746 	p = val;
747 	switch (*fmt) {
748 	case 'A':
749 		if (!nflag)
750 			printf("%s%s", name, sep);
751 		printf("%.*s", len, p);
752 		free(oval);
753 		return (0);
754 
755 	case 'I':
756 	case 'L':
757 	case 'Q':
758 		if (!nflag)
759 			printf("%s%s", name, sep);
760 		switch (*fmt) {
761 		case 'I': intlen = sizeof(int); break;
762 		case 'L': intlen = sizeof(long); break;
763 		case 'Q': intlen = sizeof(quad_t); break;
764 		}
765 		hexlen = 2 + (intlen * CHAR_BIT + 3) / 4;
766 		sep1 = "";
767 		while (len >= intlen) {
768 			switch (*fmt) {
769 			case 'I':
770 				umv = *(u_int *)p;
771 				mv = *(int *)p;
772 				break;
773 			case 'L':
774 				umv = *(u_long *)p;
775 				mv = *(long *)p;
776 				break;
777 			case 'Q':
778 				umv = *(u_quad_t *)p;
779 				mv = *(quad_t *)p;
780 				break;
781 			}
782 			fputs(sep1, stdout);
783 			if (fmt[1] == 'U')
784 				printf(hflag ? "%'ju" : "%ju", umv);
785 			else if (fmt[1] == 'X')
786 				printf("%#0*jx", hexlen, umv);
787 			else if (fmt[1] == 'K') {
788 				if (mv < 0)
789 					printf("%jd", mv);
790 				else
791 					printf("%.1fC", (mv - 2732.0) / 10);
792 			} else
793 				printf(hflag ? "%'jd" : "%jd", mv);
794 			sep1 = " ";
795 			len -= intlen;
796 			p += intlen;
797 		}
798 		free(oval);
799 		return (0);
800 
801 	case 'P':
802 		if (!nflag)
803 			printf("%s%s", name, sep);
804 		printf("%p", *(void **)p);
805 		free(oval);
806 		return (0);
807 
808 	case 'T':
809 	case 'S':
810 		i = 0;
811 		if (strcmp(fmt, "S,clockinfo") == 0)
812 			func = S_clockinfo;
813 		else if (strcmp(fmt, "S,timeval") == 0)
814 			func = S_timeval;
815 		else if (strcmp(fmt, "S,loadavg") == 0)
816 			func = S_loadavg;
817 		else if (strcmp(fmt, "S,vmtotal") == 0)
818 			func = S_vmtotal;
819 		else if (strcmp(fmt, "S,sensor") == 0)
820 			func = S_sensor;
821 		else if (strcmp(fmt, "T,dev_t") == 0)
822 			func = T_dev_t;
823 		else
824 			func = NULL;
825 		if (func) {
826 			if (!nflag)
827 				printf("%s%s", name, sep);
828 			i = (*func)(len, p);
829 			free(oval);
830 			return (i);
831 		}
832 		/* FALLTHROUGH */
833 	default:
834 		if (!oflag && !xflag) {
835 			free(oval);
836 			return (1);
837 		}
838 		if (!nflag)
839 			printf("%s%s", name, sep);
840 		printf("Format:%s Length:%d Dump:0x", fmt, len);
841 		while (len-- && (xflag || p < val + 16))
842 			printf("%02x", *p++);
843 		if (!xflag && len > 16)
844 			printf("...");
845 		free(oval);
846 		return (0);
847 	}
848 	free(oval);
849 	return (1);
850 }
851 
852 static int
853 sysctl_all(int *oid, int len)
854 {
855 	int name1[22], name2[22];
856 	int i, j;
857 	size_t l1, l2;
858 
859 	name1[0] = 0;
860 	name1[1] = 2;
861 	l1 = 2;
862 	if (len) {
863 		memcpy(name1+2, oid, len * sizeof(int));
864 		l1 += len;
865 	} else {
866 		name1[2] = 1;
867 		l1++;
868 	}
869 	for (;;) {
870 		l2 = sizeof(name2);
871 		j = sysctl(name1, l1, name2, &l2, 0, 0);
872 		if (j < 0) {
873 			if (errno == ENOENT)
874 				return (0);
875 			else
876 				err(1, "sysctl(getnext) %d %d", j, l2);
877 		}
878 
879 		l2 /= sizeof(int);
880 
881 		if (len < 0 || l2 < (unsigned int)len)
882 			return (0);
883 
884 		for (i = 0; i < len; i++)
885 			if (name2[i] != oid[i])
886 				return (0);
887 
888 		i = show_var(name2, l2);
889 		if (!i && !bflag)
890 			putchar('\n');
891 
892 		memcpy(name1+2, name2, l2 * sizeof(int));
893 		l1 = 2 + l2;
894 	}
895 }
896