xref: /netbsd-src/usr.sbin/pstat/pstat.c (revision bdc22b2e01993381dcefeff2bc9b56ca75a4235c)
1 /*	$NetBSD: pstat.c,v 1.128 2017/05/04 16:26:09 sevan Exp $	*/
2 
3 /*-
4  * Copyright (c) 1980, 1991, 1993, 1994
5  *	The Regents of the University of California.  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  * 3. Neither the name of the University nor the names of its contributors
16  *    may be used to endorse or promote products derived from this software
17  *    without specific prior written permission.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29  * SUCH DAMAGE.
30  */
31 
32 #include <sys/cdefs.h>
33 #ifndef lint
34 __COPYRIGHT("@(#) Copyright (c) 1980, 1991, 1993, 1994\
35  The Regents of the University of California.  All rights reserved.");
36 #endif /* not lint */
37 
38 #ifndef lint
39 #if 0
40 static char sccsid[] = "@(#)pstat.c	8.16 (Berkeley) 5/9/95";
41 #else
42 __RCSID("$NetBSD: pstat.c,v 1.128 2017/05/04 16:26:09 sevan Exp $");
43 #endif
44 #endif /* not lint */
45 
46 #define _KERNEL
47 #include <sys/types.h>
48 #undef _KERNEL
49 #include <sys/param.h>
50 #include <sys/time.h>
51 #include <sys/vnode.h>
52 #include <sys/ucred.h>
53 #include <stdbool.h>
54 #define _KERNEL
55 #define NFS
56 #include <sys/mount.h>
57 #undef NFS
58 #include <sys/file.h>
59 #include <ufs/ufs/inode.h>
60 #include <ufs/ufs/ufsmount.h>
61 #include <sys/uio.h>
62 #include <miscfs/genfs/layer.h>
63 #undef _KERNEL
64 #include <sys/stat.h>
65 #include <nfs/nfsproto.h>
66 #include <nfs/rpcv2.h>
67 #include <nfs/nfs.h>
68 #include <nfs/nfsnode.h>
69 #include <sys/ioctl.h>
70 #include <sys/tty.h>
71 #include <sys/conf.h>
72 
73 #include <sys/sysctl.h>
74 
75 #include <err.h>
76 #include <errno.h>
77 #include <kvm.h>
78 #include <limits.h>
79 #include <nlist.h>
80 #include <stdio.h>
81 #include <stdlib.h>
82 #include <string.h>
83 #include <unistd.h>
84 
85 #include "swapctl.h"
86 
87 struct nlist nl[] = {
88 #define	V_LRU_FREE_LIST	0
89 	{ "_lru_free_list", 0, 0, 0, 0 },	/* address of lru free list. */
90 #define	V_LRU_HOLD_LIST	1
91 	{ "_lru_hold_list", 0, 0, 0, 0 },	/* address of lru hold list. */
92 #define	V_LRU_VRELE_LIST	2
93 	{ "_lru_vrele_list", 0, 0, 0, 0 },	/* address of lru vrele list. */
94 #define	V_NUMV		3
95 	{ "_numvnodes", 0, 0, 0, 0 },
96 #define	V_NEXT_OFFSET	4
97 	{ "_vnode_offset_next_by_lru", 0, 0, 0, 0 },
98 #define	FNL_NFILE	5
99 	{ "_nfiles", 0, 0, 0, 0 },
100 #define FNL_MAXFILE	6
101 	{ "_maxfiles", 0, 0, 0, 0 },
102 #define TTY_NTTY	7
103 	{ "_tty_count", 0, 0, 0, 0 },
104 #define TTY_TTYLIST	8
105 	{ "_ttylist", 0, 0, 0, 0 },
106 #define NLMANDATORY TTY_TTYLIST	/* names up to here are mandatory */
107 	{ "", 0, 0, 0, 0 }
108 };
109 
110 int	usenumflag;
111 int	totalflag;
112 int	kflag;
113 int	hflag;
114 char	*nlistf	= NULL;
115 char	*memf	= NULL;
116 kvm_t	*kd;
117 
118 static const char * const dtypes[] = { DTYPE_NAMES };
119 
120 
121 static const struct {
122 	u_int m_flag;
123 	u_int m_visible;
124 	const char *m_name;
125 } mnt_flags[] = {
126 	__MNT_FLAGS
127 };
128 
129 struct flagbit_desc {
130 	u_int fd_flags;
131 	char fd_mark;
132 };
133 
134 #define	SVAR(var) __STRING(var)	/* to force expansion */
135 #define	KGET(idx, var)							\
136 	KGET1(idx, &var, sizeof(var), SVAR(var))
137 #define	KGET1(idx, p, s, msg)						\
138 	KGET2(nl[idx].n_value, p, s, msg)
139 #define	KGET2(addr, p, s, msg) do {					\
140 	if (kvm_read(kd, (u_long)(addr), p, s) != s)			\
141 		warnx("cannot read %s: %s", msg, kvm_geterr(kd));	\
142 } while (/* CONSTCOND */0)
143 #define	KGETRET(addr, p, s, msg) do {					\
144 	if (kvm_read(kd, (u_long)(addr), p, s) != s) {			\
145 		warnx("cannot read %s: %s", msg, kvm_geterr(kd));	\
146 		return (0);						\
147 	}								\
148 } while (/* CONSTCOND */0)
149 
150 #if 1				/* This is copied from vmstat/vmstat.c */
151 /*
152  * Print single word.  `ovflow' is number of characters didn't fit
153  * on the last word.  `fmt' is a format string to print this word.
154  * It must contain asterisk for field width.  `width' is a width
155  * occupied by this word.  `fixed' is a number of constant chars in
156  * `fmt'.  `val' is a value to be printed using format string `fmt'.
157  */
158 #define	PRWORD(ovflw, fmt, width, fixed, val) do {	\
159 	(ovflw) += printf((fmt),			\
160 	    (width) - (fixed) - (ovflw) > 0 ?		\
161 	    (width) - (fixed) - (ovflw) : 0,		\
162 	    (val)) - (width);				\
163 	if ((ovflw) < 0)				\
164 		(ovflw) = 0;				\
165 } while (/* CONSTCOND */0)
166 #endif
167 
168 void	filemode(void);
169 int	getfiles(char **, int *, char **);
170 int	getflags(const struct flagbit_desc *, char *, u_int);
171 struct mount *
172 	getmnt(struct mount *);
173 char *	kinfo_vnodes(int *);
174 void	layer_header(void);
175 int	layer_print(struct vnode *, int);
176 char *	loadvnodes(int *);
177 void	mount_print(struct mount *);
178 void	nfs_header(void);
179 int	nfs_print(struct vnode *, int);
180 void	ttymode(void);
181 void	ttyprt(struct tty *);
182 void	ufs_header(void);
183 int	ufs_print(struct vnode *, int);
184 int	ext2fs_print(struct vnode *, int);
185 __dead void	usage(void);
186 void	vnode_header(void);
187 int	vnode_print(struct vnode *, struct vnode *);
188 void	vnodemode(void);
189 
190 int
191 main(int argc, char *argv[])
192 {
193 	int ch, i, quit, ret, use_sysctl;
194 	int fileflag, swapflag, ttyflag, vnodeflag;
195 	gid_t egid = getegid();
196 	char buf[_POSIX2_LINE_MAX];
197 
198 	setegid(getgid());
199 	fileflag = swapflag = ttyflag = vnodeflag = 0;
200 	while ((ch = getopt(argc, argv, "TM:N:fghikmnstv")) != -1)
201 		switch (ch) {
202 		case 'f':
203 			fileflag = 1;
204 			break;
205 		case 'M':
206 			memf = optarg;
207 			break;
208 		case 'N':
209 			nlistf = optarg;
210 			break;
211 		case 'n':
212 			usenumflag = 1;
213 			break;
214 		case 's':
215 			swapflag = 1;
216 			break;
217 		case 'T':
218 			totalflag = 1;
219 			break;
220 		case 't':
221 			ttyflag = 1;
222 			break;
223 		case 'k':
224 			kflag = 1;
225 			break;
226 		case 'g':
227 			kflag = 3; /* 1k ^ 3 */
228 			break;
229 		case 'h':
230 			hflag = 1;
231 			break;
232 		case 'm':
233 			kflag = 2; /* 1k ^ 2 */
234 			break;
235 		case 'v':
236 		case 'i':		/* Backward compatibility. */
237 			vnodeflag = 1;
238 			break;
239 		default:
240 			usage();
241 		}
242 	argc -= optind;
243 	argv += optind;
244 
245 	/*
246 	 * Discard setgid privileges.  If not the running kernel, we toss
247 	 * them away totally so that bad guys can't print interesting stuff
248 	 * from kernel memory, otherwise switch back to kmem for the
249 	 * duration of the kvm_openfiles() call.
250 	 */
251 	if (nlistf != NULL || memf != NULL)
252 		(void)setgid(getgid());
253 	else
254 		(void)setegid(egid);
255 
256 	use_sysctl = (nlistf == NULL && memf == NULL);
257 
258 	if ((kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, buf)) == 0)
259 		errx(1, "kvm_openfiles: %s", buf);
260 
261 	/* get rid of it now anyway */
262 	if (nlistf == NULL && memf == NULL)
263 		(void)setgid(getgid());
264 	if ((ret = kvm_nlist(kd, nl)) != 0) {
265 		if (ret == -1)
266 			errx(1, "kvm_nlist: %s", kvm_geterr(kd));
267 		for (i = quit = 0; i <= NLMANDATORY; i++)
268 			if (!nl[i].n_value) {
269 				quit = 1;
270 				warnx("undefined symbol: %s", nl[i].n_name);
271 			}
272 		if (quit)
273 			exit(1);
274 	}
275 	if (!(fileflag | vnodeflag | ttyflag | swapflag | totalflag))
276 		usage();
277 	if (fileflag || totalflag)
278 		filemode();
279 	if (vnodeflag || totalflag)
280 		vnodemode();
281 	if (ttyflag)
282 		ttymode();
283 	if (swapflag || totalflag)
284 		if (use_sysctl)
285 			list_swap(0, kflag, 0, totalflag, 1, hflag);
286 	exit(0);
287 }
288 
289 #define	VPTRSZ  sizeof(struct vnode *)
290 #define	VNODESZ sizeof(struct vnode)
291 #define	PTRSTRWIDTH ((int)sizeof(void *) * 2) /* Width of resulting string
292 						 when pointer is printed
293 						 in hexadecimal. */
294 
295 static void
296 devprintf(char *buf, size_t buflen, dev_t dev)
297 {
298 	(void)snprintf(buf, buflen, "%llu,%llu",
299 	    (unsigned long long)major(dev),
300 	    (unsigned long long)minor(dev));
301 }
302 
303 void
304 vnodemode(void)
305 {
306 	char *e_vnodebase, *endvnode, *evp;
307 	struct vnode *vp;
308 	struct mount *maddr, *mp;
309 	int numvnodes, ovflw;
310 	int (*vnode_fsprint) (struct vnode *, int); /* per-fs data printer */
311 
312 	mp = NULL;
313 	e_vnodebase = loadvnodes(&numvnodes);
314 	if (totalflag) {
315 		(void)printf("%7d vnodes\n", numvnodes);
316 		goto out;
317 	}
318 	endvnode = e_vnodebase + numvnodes * (VPTRSZ + VNODESZ);
319 	(void)printf("%d active vnodes\n", numvnodes);
320 
321 #define	ST	mp->mnt_stat
322 #define	FSTYPE_IS(mp, name)						\
323 	(strncmp((mp)->mnt_stat.f_fstypename, (name), 			\
324 	sizeof((mp)->mnt_stat.f_fstypename)) == 0)
325 	maddr = NULL;
326 	vnode_fsprint = NULL;
327 	for (evp = e_vnodebase; evp < endvnode; evp += VPTRSZ + VNODESZ) {
328 		vp = (struct vnode *)(evp + VPTRSZ);
329 		if (vp->v_mount != maddr) {
330 			/*
331 			 * New filesystem
332 			 */
333 			if ((mp = getmnt(vp->v_mount)) == NULL)
334 				continue;
335 			maddr = vp->v_mount;
336 			mount_print(mp);
337 			vnode_header();
338 			/*
339 			 * XXX do this in a more fs-independent way
340 			 */
341 			if (FSTYPE_IS(mp, MOUNT_FFS) ||
342 			    FSTYPE_IS(mp, MOUNT_MFS)) {
343 				ufs_header();
344 				vnode_fsprint = ufs_print;
345 			} else if (FSTYPE_IS(mp, MOUNT_NFS)) {
346 				nfs_header();
347 				vnode_fsprint = nfs_print;
348 			} else if (FSTYPE_IS(mp, MOUNT_EXT2FS)) {
349 				ufs_header();
350 				vnode_fsprint = ext2fs_print;
351 			} else if (FSTYPE_IS(mp, MOUNT_NULL) ||
352 			    FSTYPE_IS(mp, MOUNT_OVERLAY) ||
353 			    FSTYPE_IS(mp, MOUNT_UMAP)) {
354 				layer_header();
355 				vnode_fsprint = layer_print;
356 			} else
357 				vnode_fsprint = NULL;
358 			(void)printf("\n");
359 		}
360 		ovflw = vnode_print(*(struct vnode **)evp, vp);
361 		if (VTOI(vp) != NULL && vnode_fsprint != NULL)
362 			(*vnode_fsprint)(vp, ovflw);
363 		(void)printf("\n");
364 	}
365 
366  out:
367 	if (e_vnodebase)
368 		free(e_vnodebase);
369 }
370 
371 int
372 getflags(const struct flagbit_desc *fd, char *p, u_int flags)
373 {
374 	char *q = p;
375 
376 	if (flags == 0) {
377 		*p++ = '-';
378 		*p = '\0';
379 		return (0);
380 	}
381 
382 	for (; fd->fd_flags != 0; fd++)
383 		if ((flags & fd->fd_flags) != 0)
384 			*p++ = fd->fd_mark;
385 	*p = '\0';
386 	return (p - q);
387 }
388 
389 const struct flagbit_desc vnode_flags[] = {
390 	{ VV_ROOT,	'R' },
391 	{ VI_TEXT,	'T' },
392 	{ VV_SYSTEM,	'S' },
393 	{ VV_ISTTY,	'I' },
394 	{ VI_EXECMAP,	'E' },
395 	{ VU_DIROP,	'D' },
396 	{ VI_ONWORKLST,	'O' },
397 	{ 0,		'\0' },
398 };
399 
400 void
401 vnode_header(void)
402 {
403 
404 	(void)printf("%-*s TYP VFLAG  USE HOLD TAG NPAGE",
405 	    PTRSTRWIDTH, "ADDR");
406 }
407 
408 int
409 vnode_print(struct vnode *avnode, struct vnode *vp)
410 {
411 	const char *type;
412 	char flags[sizeof(vnode_flags) / sizeof(vnode_flags[0])];
413 	int ovflw;
414 
415 	/*
416 	 * set type
417 	 */
418 	switch (vp->v_type) {
419 	case VNON:
420 		type = "non"; break;
421 	case VREG:
422 		type = "reg"; break;
423 	case VDIR:
424 		type = "dir"; break;
425 	case VBLK:
426 		type = "blk"; break;
427 	case VCHR:
428 		type = "chr"; break;
429 	case VLNK:
430 		type = "lnk"; break;
431 	case VSOCK:
432 		type = "soc"; break;
433 	case VFIFO:
434 		type = "fif"; break;
435 	case VBAD:
436 		type = "bad"; break;
437 	default:
438 		type = "unk"; break;
439 	}
440 	/*
441 	 * gather flags
442 	 */
443 	(void)getflags(vnode_flags, flags,
444 	    vp->v_uflag | vp->v_iflag | vp->v_vflag);
445 
446 	ovflw = 0;
447 	PRWORD(ovflw, "%*lx", PTRSTRWIDTH, 0, (long)avnode);
448 	PRWORD(ovflw, " %*s", 4, 1, type);
449 	PRWORD(ovflw, " %*s", 6, 1, flags);
450 	PRWORD(ovflw, " %*ld", 5, 1, (long)vp->v_usecount);
451 	PRWORD(ovflw, " %*ld", 5, 1, (long)vp->v_holdcnt);
452 	PRWORD(ovflw, " %*d", 4, 1, vp->v_tag);
453 	PRWORD(ovflw, " %*d", 6, 1, vp->v_uobj.uo_npages);
454 	return (ovflw);
455 }
456 
457 const struct flagbit_desc ufs_flags[] = {
458 	{ IN_ACCESS,	'A' },
459 	{ IN_CHANGE,	'C' },
460 	{ IN_UPDATE,	'U' },
461 	{ IN_MODIFIED,	'M' },
462 	{ IN_ACCESSED,	'a' },
463 	{ IN_SHLOCK,	'S' },
464 	{ IN_EXLOCK,	'E' },
465 	{ IN_SPACECOUNTED, 's' },
466 	{ 0,		'\0' },
467 };
468 
469 void
470 ufs_header(void)
471 {
472 
473 	(void)printf(" FILEID IFLAG RDEV|SZ");
474 }
475 
476 int
477 ufs_print(struct vnode *vp, int ovflw)
478 {
479 	struct inode inode, *ip = &inode;
480 	union dinode {
481 		struct ufs1_dinode dp1;
482 		struct ufs2_dinode dp2;
483 	} dip;
484 	struct ufsmount ump;
485 	char flags[sizeof(ufs_flags) / sizeof(ufs_flags[0])];
486 	char dev[4 + 1 + 7 + 1]; /* 12bit marjor + 20bit minor */
487 	char *name;
488 	mode_t type;
489 	dev_t rdev;
490 
491 	KGETRET(VTOI(vp), &inode, sizeof(struct inode), "vnode's inode");
492 	KGETRET(ip->i_ump, &ump, sizeof(struct ufsmount),
493 	    "vnode's mount point");
494 
495 	if (ump.um_fstype == UFS1) {
496 		KGETRET(ip->i_din.ffs1_din, &dip, sizeof (struct ufs1_dinode),
497 		    "inode's dinode");
498 		rdev = (uint32_t)dip.dp1.di_rdev;
499 	} else {
500 		KGETRET(ip->i_din.ffs2_din, &dip, sizeof (struct ufs2_dinode),
501 		    "inode's UFS2 dinode");
502 		rdev = dip.dp2.di_rdev;
503 	}
504 
505 	/*
506 	 * XXX need to to locking state.
507 	 */
508 
509 	(void)getflags(ufs_flags, flags, ip->i_flag);
510 	PRWORD(ovflw, " %*llu", 7, 1, (unsigned long long)ip->i_number);
511 	PRWORD(ovflw, " %*s", 6, 1, flags);
512 	type = ip->i_mode & S_IFMT;
513 	if (S_ISCHR(ip->i_mode) || S_ISBLK(ip->i_mode)) {
514 		if (usenumflag ||
515 		    (name = devname(rdev, type)) == NULL) {
516 			devprintf(dev, sizeof(dev), rdev);
517 			name = dev;
518 		}
519 		PRWORD(ovflw, " %*s", 8, 1, name);
520 	} else
521 		PRWORD(ovflw, " %*lld", 8, 1, (long long)ip->i_size);
522 	return 0;
523 }
524 
525 int
526 ext2fs_print(struct vnode *vp, int ovflw)
527 {
528 	struct inode inode, *ip = &inode;
529 	struct ext2fs_dinode dip;
530 	char flags[sizeof(ufs_flags) / sizeof(ufs_flags[0])];
531 	char dev[4 + 1 + 7 + 1]; /* 12bit marjor + 20bit minor */
532 	char *name;
533 	mode_t type;
534 
535 	KGETRET(VTOI(vp), &inode, sizeof(struct inode), "vnode's inode");
536 	KGETRET(ip->i_din.e2fs_din, &dip, sizeof (struct ext2fs_dinode),
537 	    "inode's dinode");
538 
539 	/*
540 	 * XXX need to to locking state.
541 	 */
542 
543 	(void)getflags(ufs_flags, flags, ip->i_flag);
544 	PRWORD(ovflw, " %*llu", 7, 1, (unsigned long long)ip->i_number);
545 	PRWORD(ovflw, " %*s", 6, 1, flags);
546 	type = dip.e2di_mode & S_IFMT;
547 	if (S_ISCHR(dip.e2di_mode) || S_ISBLK(dip.e2di_mode)) {
548 		if (usenumflag ||
549 		    (name = devname(dip.e2di_rdev, type)) == NULL) {
550 			devprintf(dev, sizeof(dev), dip.e2di_rdev);
551 			name = dev;
552 		}
553 		PRWORD(ovflw, " %*s", 8, 1, name);
554 	} else
555 		PRWORD(ovflw, " %*u", 8, 1, (u_int)dip.e2di_size);
556 	return (0);
557 }
558 
559 const struct flagbit_desc nfs_flags[] = {
560 	{ NFLUSHWANT,	'W' },
561 	{ NFLUSHINPROG,	'P' },
562 	{ NMODIFIED,	'M' },
563 	{ NWRITEERR,	'E' },
564 	{ NACC,		'A' },
565 	{ NUPD,		'U' },
566 	{ NCHG,		'C' },
567 	{ 0,		'\0' },
568 };
569 
570 void
571 nfs_header(void)
572 {
573 
574 	(void)printf(" FILEID NFLAG RDEV|SZ");
575 }
576 
577 int
578 nfs_print(struct vnode *vp, int ovflw)
579 {
580 	struct nfsnode nfsnode, *np = &nfsnode;
581 	char flags[sizeof(nfs_flags) / sizeof(nfs_flags[0])];
582 	char dev[4 + 1 + 7 + 1]; /* 12bit marjor + 20bit minor */
583 	struct vattr va;
584 	char *name;
585 	mode_t type;
586 
587 	KGETRET(VTONFS(vp), &nfsnode, sizeof(nfsnode), "vnode's nfsnode");
588 	(void)getflags(nfs_flags, flags, np->n_flag);
589 
590 	KGETRET(np->n_vattr, &va, sizeof(va), "vnode attr");
591 	PRWORD(ovflw, " %*ld", 7, 1, (long)va.va_fileid);
592 	PRWORD(ovflw, " %*s", 6, 1, flags);
593 	switch (va.va_type) {
594 	case VCHR:
595 		type = S_IFCHR;
596 		goto device;
597 
598 	case VBLK:
599 		type = S_IFBLK;
600 	device:
601 		if (usenumflag || (name = devname(va.va_rdev, type)) == NULL) {
602 			devprintf(dev, sizeof(dev), va.va_rdev);
603 			name = dev;
604 		}
605 		PRWORD(ovflw, " %*s", 8, 1, name);
606 		break;
607 	default:
608 		PRWORD(ovflw, " %*lld", 8, 1, (long long)np->n_size);
609 		break;
610 	}
611 	return (0);
612 }
613 
614 void
615 layer_header(void)
616 {
617 
618 	(void)printf(" %*s", PTRSTRWIDTH, "LOWER");
619 }
620 
621 int
622 layer_print(struct vnode *vp, int ovflw)
623 {
624 	struct layer_node lnode, *lp = &lnode;
625 
626 	KGETRET(VTOLAYER(vp), &lnode, sizeof(lnode), "layer vnode");
627 
628 	PRWORD(ovflw, " %*lx", PTRSTRWIDTH + 1, 1, (long)lp->layer_lowervp);
629 	return (0);
630 }
631 
632 /*
633  * Given a pointer to a mount structure in kernel space,
634  * read it in and return a usable pointer to it.
635  */
636 struct mount *
637 getmnt(struct mount *maddr)
638 {
639 	static struct mtab {
640 		struct mtab *next;
641 		struct mount *maddr;
642 		struct mount mount;
643 	} *mhead = NULL;
644 	struct mtab *mt;
645 	struct mount mb;
646 
647 	for (mt = mhead; mt != NULL; mt = mt->next)
648 		if (maddr == mt->maddr)
649 			return (&mt->mount);
650 	KGETRET(maddr, &mb, sizeof(struct mount), "mount table");
651 	if ((mt = malloc(sizeof(struct mtab))) == NULL)
652 		err(1, "malloc");
653 	mt->mount = mb;
654 	mt->maddr = maddr;
655 	mt->next = mhead;
656 	mhead = mt;
657 	return (&mt->mount);
658 }
659 
660 void
661 mount_print(struct mount *mp)
662 {
663 	int flags;
664 
665 	(void)printf("*** MOUNT %s %s on %s", ST.f_fstypename,
666 	    ST.f_mntfromname, ST.f_mntonname);
667 	if ((flags = mp->mnt_flag) != 0) {
668 		size_t i;
669 		const char *sep = " (";
670 
671 		for (i = 0; i < sizeof mnt_flags / sizeof mnt_flags[0]; i++) {
672 			if (flags & mnt_flags[i].m_flag) {
673 				(void)printf("%s%s", sep, mnt_flags[i].m_name);
674 				flags &= ~mnt_flags[i].m_flag;
675 				sep = ",";
676 			}
677 		}
678 		if (flags)
679 			(void)printf("%sunknown_flags:%x", sep, flags);
680 		(void)printf(")");
681 	}
682 	(void)printf("\n");
683 }
684 
685 char *
686 loadvnodes(int *avnodes)
687 {
688 	int mib[2];
689 	int status;
690 	size_t copysize;
691 #if 0
692 	size_t oldsize;
693 #endif
694 	char *vnodebase;
695 
696 	if (totalflag) {
697 		KGET(V_NUMV, *avnodes);
698 		return NULL;
699 	}
700 	if (memf != NULL) {
701 		/*
702 		 * do it by hand
703 		 */
704 		return (kinfo_vnodes(avnodes));
705 	}
706 	mib[0] = CTL_KERN;
707 	mib[1] = KERN_VNODE;
708 	/*
709 	 * First sysctl call gets the necessary buffer size; second
710 	 * sysctl call gets the data.  We allow for some growth in the
711 	 * data size between the two sysctl calls (increases of a few
712 	 * thousand vnodes in between the two calls have been observed).
713 	 * We ignore ENOMEM from the second sysctl call, which can
714 	 * happen if the kernel's data grew by even more than we allowed
715 	 * for.
716 	 */
717 	if (sysctl(mib, 2, NULL, &copysize, NULL, 0) == -1)
718 		err(1, "sysctl: KERN_VNODE");
719 #if 0
720 	oldsize = copysize;
721 #endif
722 	copysize += 100 * sizeof(struct vnode) + copysize / 20;
723 	if ((vnodebase = malloc(copysize)) == NULL)
724 		err(1, "malloc");
725 	status = sysctl(mib, 2, vnodebase, &copysize, NULL, 0);
726 	if (status == -1 && errno != ENOMEM)
727 		err(1, "sysctl: KERN_VNODE");
728 #if 0 /* for debugging the amount of growth allowed for */
729 	if (copysize != oldsize) {
730 		warnx("count changed from %ld to %ld (%+ld)%s",
731 		    (long)(oldsize / sizeof(struct vnode)),
732 		    (long)(copysize / sizeof(struct vnode)),
733 		    (long)(copysize / sizeof(struct vnode)) -
734 			(long)(oldsize / sizeof(struct vnode)),
735 		    (status == 0 ? "" : ", and errno = ENOMEM"));
736 	}
737 #endif
738 	if (copysize % (VPTRSZ + VNODESZ))
739 		errx(1, "vnode size mismatch");
740 	*avnodes = copysize / (VPTRSZ + VNODESZ);
741 
742 	return (vnodebase);
743 }
744 
745 /*
746  * simulate what a running kernel does in in kinfo_vnode
747  */
748 static int
749 vnode_cmp(const void *p1, const void *p2)
750 {
751 	const char *s1 = (const char *)p1;
752 	const char *s2 = (const char *)p2;
753 	const struct vnode *v1 = (const struct vnode *)(s1 + VPTRSZ);
754 	const struct vnode *v2 = (const struct vnode *)(s2 + VPTRSZ);
755 
756 	return (v2->v_mount - v1->v_mount);
757 }
758 
759 char *
760 kinfo_vnodes(int *avnodes)
761 {
762 	int i;
763 	char *beg, *bp, *ep;
764 	int numvnodes, next_offset;
765 
766 	KGET(V_NUMV, numvnodes);
767 	if ((bp = malloc((numvnodes + 20) * (VPTRSZ + VNODESZ))) == NULL)
768 		err(1, "malloc");
769 	beg = bp;
770 	ep = bp + (numvnodes + 20) * (VPTRSZ + VNODESZ);
771 	KGET(V_NEXT_OFFSET, next_offset);
772 
773 	for (i = V_LRU_FREE_LIST; i <= V_LRU_VRELE_LIST; i++) {
774 		TAILQ_HEAD(vnodelst, vnode) lru_head;
775 		struct vnode *vp, vnode;
776 
777 		KGET(i, lru_head);
778 		vp = TAILQ_FIRST(&lru_head);
779 		while (vp != NULL) {
780 			KGET2(vp, &vnode, sizeof(vnode), "vnode");
781 			if (bp + VPTRSZ + VNODESZ > ep)
782 				/* XXX - should realloc */
783 				errx(1, "no more room for vnodes");
784 			memmove(bp, &vp, VPTRSZ);
785 			bp += VPTRSZ;
786 			memmove(bp, &vnode, VNODESZ);
787 			bp += VNODESZ;
788 			KGET2((char *)vp + next_offset, &vp, sizeof(vp), "nvp");
789 		}
790 	}
791 	*avnodes = (bp - beg) / (VPTRSZ + VNODESZ);
792 	/* Sort by mount like we get it from sysctl. */
793 	qsort(beg, *avnodes, VPTRSZ + VNODESZ, vnode_cmp);
794 	return (beg);
795 }
796 
797 void
798 ttymode(void)
799 {
800 	int ntty;
801 	struct ttylist_head tty_head;
802 	struct tty *tp, tty;
803 
804 	KGET(TTY_NTTY, ntty);
805 	(void)printf("%d terminal device%s\n", ntty, ntty == 1 ? "" : "s");
806 	KGET(TTY_TTYLIST, tty_head);
807 	(void)printf(
808 	    "  LINE RAW CAN OUT  HWT LWT     COL STATE  %-*s  PGID DISC\n",
809 	    PTRSTRWIDTH, "SESS");
810 	for (tp = tty_head.tqh_first; tp; tp = tty.tty_link.tqe_next) {
811 		KGET2(tp, &tty, sizeof tty, "tty struct");
812 		ttyprt(&tty);
813 	}
814 }
815 
816 static const struct flagbit_desc ttystates[] = {
817 	{ TS_ISOPEN,	'O'},
818 	{ TS_DIALOUT,	'>'},
819 	{ TS_CARR_ON,	'C'},
820 	{ TS_TIMEOUT,	'T'},
821 	{ TS_FLUSH,	'F'},
822 	{ TS_BUSY,	'B'},
823 	{ TS_XCLUDE,	'X'},
824 	{ TS_TTSTOP,	'S'},
825 	{ TS_TBLOCK,	'K'},
826 	{ TS_ASYNC,	'Y'},
827 	{ TS_BKSL,	'D'},
828 	{ TS_ERASE,	'E'},
829 	{ TS_LNCH,	'L'},
830 	{ TS_TYPEN,	'P'},
831 	{ TS_CNTTB,	'N'},
832 	{ 0,		'\0'},
833 };
834 
835 void
836 ttyprt(struct tty *tp)
837 {
838 	char state[sizeof(ttystates) / sizeof(ttystates[0]) + 1];
839 	char dev[2 + 3 + 1 + 5 + 1]; /* 12bit major + 20bit minor */
840 	struct linesw t_linesw;
841 	const char *name;
842 	char buffer;
843 	pid_t pgid;
844 	int n, ovflw;
845 
846 	if (usenumflag || (name = devname(tp->t_dev, S_IFCHR)) == NULL) {
847 		devprintf(dev, sizeof(dev), tp->t_dev);
848 		name = dev;
849 	}
850 	ovflw = 0;
851 	PRWORD(ovflw, "%-*s", 7, 0, name);
852 	PRWORD(ovflw, " %*d", 3, 1, tp->t_rawq.c_cc);
853 	PRWORD(ovflw, " %*d", 4, 1, tp->t_canq.c_cc);
854 	PRWORD(ovflw, " %*d", 4, 1, tp->t_outq.c_cc);
855 	PRWORD(ovflw, " %*d", 5, 1, tp->t_hiwat);
856 	PRWORD(ovflw, " %*d", 4, 1, tp->t_lowat);
857 	PRWORD(ovflw, " %*d", 8, 1, tp->t_column);
858 	n = getflags(ttystates, state, tp->t_state);
859 	if (tp->t_wopen) {
860 		state[n++] = 'W';
861 		state[n] = '\0';
862 	}
863 	PRWORD(ovflw, " %-*s", 7, 1, state);
864 	PRWORD(ovflw, " %*lX", PTRSTRWIDTH + 1, 1, (u_long)tp->t_session);
865 	pgid = 0;
866 	if (tp->t_pgrp != NULL)
867 		KGET2(&tp->t_pgrp->pg_id, &pgid, sizeof(pid_t), "pgid");
868 	PRWORD(ovflw, " %*d", 6, 1, pgid);
869 	KGET2(tp->t_linesw, &t_linesw, sizeof(t_linesw),
870 	    "line discipline switch table");
871 	name = t_linesw.l_name;
872 	(void)putchar(' ');
873 	for (;;) {
874 		KGET2(name, &buffer, sizeof(buffer), "line discipline name");
875 		if (buffer == '\0')
876 			break;
877 		(void)putchar(buffer);
878 		name++;
879 	}
880 	(void)putchar('\n');
881 }
882 
883 static const struct flagbit_desc filemode_flags[] = {
884 	{ FREAD,	'R' },
885 	{ FWRITE,	'W' },
886 	{ FAPPEND,	'A' },
887 #ifdef FSHLOCK	/* currently gone */
888 	{ FSHLOCK,	'S' },
889 	{ FEXLOCK,	'X' },
890 #endif
891 	{ FASYNC,	'I' },
892 	{ 0,		'\0' },
893 };
894 
895 void
896 filemode(void)
897 {
898 	struct kinfo_file *ki;
899 	char flags[sizeof(filemode_flags) / sizeof(filemode_flags[0])];
900 	char *buf, *offset;
901 	int len, maxfile, nfile, ovflw;
902 
903 	KGET(FNL_MAXFILE, maxfile);
904 	if (totalflag) {
905 		KGET(FNL_NFILE, nfile);
906 		(void)printf("%3d/%3d files\n", nfile, maxfile);
907 		return;
908 	}
909 	if (getfiles(&buf, &len, &offset) == -1)
910 		return;
911 	/*
912 	 * Getfiles returns in malloc'd memory to an array of kinfo_file2
913 	 * structures.
914 	 */
915 	nfile = len / sizeof(struct kinfo_file);
916 
917 	(void)printf("%d/%d open files\n", nfile, maxfile);
918 	(void)printf("%*s%s%*s TYPE    FLG     CNT  MSG  %*s%s%*s IFLG OFFSET\n",
919 	    (PTRSTRWIDTH - 4) / 2, "", " LOC", (PTRSTRWIDTH - 4) / 2, "",
920 	    (PTRSTRWIDTH - 4) / 2, "", "DATA", (PTRSTRWIDTH - 4) / 2, "");
921 	for (ki = (struct kinfo_file *)offset; nfile--; ki++) {
922 		if ((unsigned)ki->ki_ftype >= sizeof(dtypes) / sizeof(dtypes[0]))
923 			continue;
924 		ovflw = 0;
925 		(void)getflags(filemode_flags, flags, ki->ki_flag);
926 		PRWORD(ovflw, "%*lx", PTRSTRWIDTH, 0, (long)ki->ki_fileaddr);
927 		PRWORD(ovflw, " %-*s", 9, 1, dtypes[ki->ki_ftype]);
928 		PRWORD(ovflw, " %*s", 6, 1, flags);
929 		PRWORD(ovflw, " %*d", 5, 1, ki->ki_count);
930 		PRWORD(ovflw, " %*d", 5, 1, ki->ki_msgcount);
931 		PRWORD(ovflw, "  %*lx", PTRSTRWIDTH + 1, 2, (long)ki->ki_fdata);
932 		PRWORD(ovflw, " %*x", 5, 1, 0);
933 		if ((off_t)ki->ki_foffset < 0)
934 			PRWORD(ovflw, "  %-*lld\n", PTRSTRWIDTH + 1, 2,
935 			    (long long)ki->ki_foffset);
936 		else
937 			PRWORD(ovflw, "  %-*lld\n", PTRSTRWIDTH + 1, 2,
938 			    (long long)ki->ki_foffset);
939 	}
940 	free(buf);
941 }
942 
943 int
944 getfiles(char **abuf, int *alen, char **aoffset)
945 {
946 	size_t len;
947 	int mib[6];
948 	char *buf;
949 	size_t offset;
950 
951 	/*
952 	 * XXX
953 	 * Add emulation of KINFO_FILE here.
954 	 */
955 	if (memf != NULL)
956 		errx(1, "files on dead kernel, not implemented");
957 
958 	mib[0] = CTL_KERN;
959 	mib[1] = KERN_FILE2;
960 	mib[2] = KERN_FILE_BYFILE;
961 	mib[3] = 0;
962 	mib[4] = sizeof(struct kinfo_file);
963 	mib[5] = 0;
964 	if (sysctl(mib, 6, NULL, &len, NULL, 0) == -1) {
965 		warn("sysctl: KERN_FILE2");
966 		return (-1);
967 	}
968 	/* We need to align (struct kinfo_file *) in the buffer. */
969 	offset = len % sizeof(off_t);
970 	mib[5] = len / sizeof(struct kinfo_file);
971 	if ((buf = malloc(len + offset)) == NULL)
972 		err(1, "malloc");
973 	if (sysctl(mib, 6, buf + offset, &len, NULL, 0) == -1) {
974 		warn("sysctl: 2nd KERN_FILE2");
975 		free(buf);
976 		return (-1);
977 	}
978 	*abuf = buf;
979 	*alen = len;
980 	*aoffset = (buf + offset);
981 	return (0);
982 }
983 
984 void
985 usage(void)
986 {
987 
988 	(void)fprintf(stderr,
989 	    "usage: %s [-T|-f|-s|-t|-v] [-ghkmn] [-M core] [-N system]\n",
990 	    getprogname());
991 	exit(1);
992 }
993