swapon.c revision 273188 
1/*-
2 * Copyright (c) 1980, 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#if 0
31#ifndef lint
32static const char copyright[] =
33"@(#) Copyright (c) 1980, 1993\n\
34	The Regents of the University of California.  All rights reserved.\n";
35#endif /* not lint */
36
37#ifndef lint
38static char sccsid[] = "@(#)swapon.c	8.1 (Berkeley) 6/5/93";
39#endif /* not lint */
40#endif
41#include <sys/cdefs.h>
42__FBSDID("$FreeBSD: releng/10.1/sbin/swapon/swapon.c 273188 2014-10-16 22:00:24Z hrs $");
43
44#include <sys/param.h>
45#include <sys/types.h>
46#include <sys/mdioctl.h>
47#include <sys/stat.h>
48#include <sys/sysctl.h>
49#include <sys/wait.h>
50#include <vm/vm_param.h>
51
52#include <err.h>
53#include <errno.h>
54#include <fcntl.h>
55#include <fnmatch.h>
56#include <fstab.h>
57#include <libgen.h>
58#include <libutil.h>
59#include <limits.h>
60#include <paths.h>
61#include <stdarg.h>
62#include <stdio.h>
63#include <stdlib.h>
64#include <string.h>
65#include <unistd.h>
66
67static void usage(void);
68static const char *swap_on_off(const char *, int, char *);
69static const char *swap_on_off_gbde(const char *, int);
70static const char *swap_on_off_geli(const char *, char *, int);
71static const char *swap_on_off_md(const char *, char *, int);
72static const char *swap_on_off_sfile(const char *, int);
73static void swaplist(int, int, int);
74static int run_cmd(int *, const char *, ...) __printflike(2, 3);
75
76static enum { SWAPON, SWAPOFF, SWAPCTL } orig_prog, which_prog = SWAPCTL;
77
78static int qflag;
79
80int
81main(int argc, char **argv)
82{
83	struct fstab *fsp;
84	const char *swfile;
85	char *ptr;
86	int ret, ch, doall;
87	int sflag, lflag, late, hflag;
88	const char *etc_fstab;
89
90	sflag = lflag = late = hflag = 0;
91	if ((ptr = strrchr(argv[0], '/')) == NULL)
92		ptr = argv[0];
93	if (strstr(ptr, "swapon") != NULL)
94		which_prog = SWAPON;
95	else if (strstr(ptr, "swapoff") != NULL)
96		which_prog = SWAPOFF;
97	orig_prog = which_prog;
98
99	doall = 0;
100	etc_fstab = NULL;
101	while ((ch = getopt(argc, argv, "AadghklLmqsUF:")) != -1) {
102		switch(ch) {
103		case 'A':
104			if (which_prog == SWAPCTL) {
105				doall = 1;
106				which_prog = SWAPON;
107			} else
108				usage();
109			break;
110		case 'a':
111			if (which_prog == SWAPON || which_prog == SWAPOFF)
112				doall = 1;
113			else
114				which_prog = SWAPON;
115			break;
116		case 'd':
117			if (which_prog == SWAPCTL)
118				which_prog = SWAPOFF;
119			else
120				usage();
121			break;
122		case 'g':
123			hflag = 'G';
124			break;
125		case 'h':
126			hflag = 'H';
127			break;
128		case 'k':
129			hflag = 'K';
130			break;
131		case 'l':
132			lflag = 1;
133			break;
134		case 'L':
135			late = 1;
136			break;
137		case 'm':
138			hflag = 'M';
139			break;
140		case 'q':
141			if (which_prog == SWAPON || which_prog == SWAPOFF)
142				qflag = 1;
143			break;
144		case 's':
145			sflag = 1;
146			break;
147		case 'U':
148			if (which_prog == SWAPCTL) {
149				doall = 1;
150				which_prog = SWAPOFF;
151			} else
152				usage();
153			break;
154		case 'F':
155			etc_fstab = optarg;
156			break;
157		case '?':
158		default:
159			usage();
160		}
161	}
162	argv += optind;
163
164	ret = 0;
165	swfile = NULL;
166	if (etc_fstab != NULL)
167		setfstab(etc_fstab);
168	if (which_prog == SWAPON || which_prog == SWAPOFF) {
169		if (doall) {
170			while ((fsp = getfsent()) != NULL) {
171				if (strcmp(fsp->fs_type, FSTAB_SW) != 0)
172					continue;
173				if (strstr(fsp->fs_mntops, "noauto") != NULL)
174					continue;
175				if (which_prog != SWAPOFF &&
176				    strstr(fsp->fs_mntops, "late") &&
177				    late == 0)
178					continue;
179				swfile = swap_on_off(fsp->fs_spec, 1,
180				    fsp->fs_mntops);
181				if (swfile == NULL) {
182					ret = 1;
183					continue;
184				}
185				if (qflag == 0) {
186					printf("%s: %sing %s as swap device\n",
187					    getprogname(),
188					    (which_prog == SWAPOFF) ?
189					    "remov" : "add", swfile);
190				}
191			}
192		} else if (*argv == NULL)
193			usage();
194		for (; *argv; ++argv) {
195			swfile = swap_on_off(*argv, 0, NULL);
196			if (swfile == NULL) {
197				ret = 1;
198				continue;
199			}
200			if (orig_prog == SWAPCTL) {
201				printf("%s: %sing %s as swap device\n",
202				    getprogname(),
203				    (which_prog == SWAPOFF) ? "remov" : "add",
204				    swfile);
205			}
206		}
207	} else {
208		if (lflag || sflag)
209			swaplist(lflag, sflag, hflag);
210		else
211			usage();
212	}
213	exit(ret);
214}
215
216static const char *
217swap_on_off(const char *name, int doingall, char *mntops)
218{
219	char base[PATH_MAX];
220
221	/* Swap on vnode-backed md(4) device. */
222	if (mntops != NULL &&
223	    (fnmatch(_PATH_DEV MD_NAME "[0-9]*", name, 0) == 0 ||
224	     fnmatch(MD_NAME "[0-9]*", name, 0) == 0 ||
225	     strncmp(_PATH_DEV MD_NAME, name,
226		sizeof(_PATH_DEV) + sizeof(MD_NAME)) == 0 ||
227	     strncmp(MD_NAME, name, sizeof(MD_NAME)) == 0))
228		return (swap_on_off_md(name, mntops, doingall));
229
230	basename_r(name, base);
231
232	/* Swap on encrypted device by GEOM_BDE. */
233	if (fnmatch("*.bde", base, 0) == 0)
234		return (swap_on_off_gbde(name, doingall));
235
236	/* Swap on encrypted device by GEOM_ELI. */
237	if (fnmatch("*.eli", base, 0) == 0)
238		return (swap_on_off_geli(name, mntops, doingall));
239
240	/* Swap on special file. */
241	return (swap_on_off_sfile(name, doingall));
242}
243
244/* Strip off .bde or .eli suffix from swap device name */
245static char *
246swap_basename(const char *name)
247{
248	char *dname, *p;
249
250	dname = strdup(name);
251	p = strrchr(dname, '.');
252	/* assert(p != NULL); */
253	*p = '\0';
254
255	return (dname);
256}
257
258static const char *
259swap_on_off_gbde(const char *name, int doingall)
260{
261	const char *ret;
262	char pass[64 * 2 + 1];
263	unsigned char bpass[64];
264	char *dname;
265	int i, error;
266
267	dname = swap_basename(name);
268	if (dname == NULL)
269		return (NULL);
270
271	if (which_prog == SWAPON) {
272		arc4random_buf(bpass, sizeof(bpass));
273		for (i = 0; i < (int)sizeof(bpass); i++)
274			sprintf(&pass[2 * i], "%02x", bpass[i]);
275		pass[sizeof(pass) - 1] = '\0';
276
277		error = run_cmd(NULL, "%s init %s -P %s", _PATH_GBDE,
278		    dname, pass);
279		if (error) {
280			/* bde device found.  Ignore it. */
281			free(dname);
282			if (qflag == 0)
283				warnx("%s: Device already in use", name);
284			return (NULL);
285		}
286		error = run_cmd(NULL, "%s attach %s -p %s", _PATH_GBDE,
287		    dname, pass);
288		free(dname);
289		if (error) {
290			warnx("gbde (attach) error: %s", name);
291			return (NULL);
292		}
293	}
294
295	ret = swap_on_off_sfile(name, doingall);
296
297	if (which_prog == SWAPOFF) {
298		error = run_cmd(NULL, "%s detach %s", _PATH_GBDE, dname);
299		free(dname);
300		if (error) {
301			/* bde device not found.  Ignore it. */
302			if (qflag == 0)
303				warnx("%s: Device not found", name);
304			return (NULL);
305		}
306	}
307
308	return (ret);
309}
310
311/* Build geli(8) arguments from mntops */
312static char *
313swap_on_geli_args(const char *mntops)
314{
315	const char *aalgo, *ealgo, *keylen_str, *sectorsize_str;
316	const char *aflag, *eflag, *lflag, *sflag;
317	char *p, *args, *token, *string, *ops;
318	int argsize, pagesize;
319	size_t pagesize_len;
320	u_long ul;
321
322	/* Use built-in defaults for geli(8). */
323	aalgo = ealgo = keylen_str = "";
324	aflag = eflag = lflag = "";
325
326	/* We will always specify sectorsize. */
327	sflag = " -s ";
328	sectorsize_str = NULL;
329
330	if (mntops != NULL) {
331		string = ops = strdup(mntops);
332
333		while ((token = strsep(&string, ",")) != NULL) {
334			if ((p = strstr(token, "aalgo=")) == token) {
335				aalgo = p + sizeof("aalgo=") - 1;
336				aflag = " -a ";
337			} else if ((p = strstr(token, "ealgo=")) == token) {
338				ealgo = p + sizeof("ealgo=") - 1;
339				eflag = " -e ";
340			} else if ((p = strstr(token, "keylen=")) == token) {
341				keylen_str = p + sizeof("keylen=") - 1;
342				errno = 0;
343				ul = strtoul(keylen_str, &p, 10);
344				if (errno == 0) {
345					if (*p != '\0' || ul > INT_MAX)
346						errno = EINVAL;
347				}
348				if (errno) {
349					warn("Invalid keylen: %s", keylen_str);
350					free(ops);
351					return (NULL);
352				}
353				lflag = " -l ";
354			} else if ((p = strstr(token, "sectorsize=")) == token) {
355				sectorsize_str = p + sizeof("sectorsize=") - 1;
356				errno = 0;
357				ul = strtoul(sectorsize_str, &p, 10);
358				if (errno == 0) {
359					if (*p != '\0' || ul > INT_MAX)
360						errno = EINVAL;
361				}
362				if (errno) {
363					warn("Invalid sectorsize: %s",
364					    sectorsize_str);
365					free(ops);
366					return (NULL);
367				}
368			} else if (strcmp(token, "sw") != 0) {
369				warnx("Invalid option: %s", token);
370				free(ops);
371				return (NULL);
372			}
373		}
374	} else
375		ops = NULL;
376
377	/*
378	 * If we do not have a sector size at this point, fill in
379	 * pagesize as sector size.
380	 */
381	if (sectorsize_str == NULL) {
382		/* Use pagesize as default sectorsize. */
383		pagesize = getpagesize();
384		pagesize_len = snprintf(NULL, 0, "%d", pagesize) + 1;
385		p = alloca(pagesize_len);
386		snprintf(p, pagesize_len, "%d", pagesize);
387		sectorsize_str = p;
388	}
389
390	argsize = asprintf(&args, "%s%s%s%s%s%s%s%s -d",
391	    aflag, aalgo, eflag, ealgo, lflag, keylen_str,
392	    sflag, sectorsize_str);
393
394	free(ops);
395	return (args);
396}
397
398static const char *
399swap_on_off_geli(const char *name, char *mntops, int doingall)
400{
401	struct stat sb;
402	char *dname, *args;
403	int error;
404
405	error = stat(name, &sb);
406
407	if (which_prog == SWAPON) do {
408		/* Skip if the .eli device already exists. */
409		if (error == 0)
410			break;
411
412		args = swap_on_geli_args(mntops);
413		if (args == NULL)
414			return (NULL);
415
416		dname = swap_basename(name);
417		if (dname == NULL) {
418			free(args);
419			return (NULL);
420		}
421
422		error = run_cmd(NULL, "%s onetime%s %s", _PATH_GELI, args,
423		    dname);
424
425		free(dname);
426		free(args);
427
428		if (error) {
429			/* error occured during creation. */
430			if (qflag == 0)
431				warnx("%s: Invalid parameters", name);
432			return (NULL);
433		}
434	} while (0);
435
436	return (swap_on_off_sfile(name, doingall));
437}
438
439static const char *
440swap_on_off_md(const char *name, char *mntops, int doingall)
441{
442	FILE *sfd;
443	int fd, mdunit, error;
444	const char *ret;
445	static char mdpath[PATH_MAX], linebuf[PATH_MAX];
446	char *p, *vnodefile;
447	size_t linelen;
448	u_long ul;
449
450	fd = -1;
451	sfd = NULL;
452	if (strlen(name) == (sizeof(MD_NAME) - 1))
453		mdunit = -1;
454	else {
455		errno = 0;
456		ul = strtoul(name + 2, &p, 10);
457		if (errno == 0) {
458			if (*p != '\0' || ul > INT_MAX)
459				errno = EINVAL;
460		}
461		if (errno) {
462			warn("Bad device unit: %s", name);
463			return (NULL);
464		}
465		mdunit = (int)ul;
466	}
467
468	vnodefile = NULL;
469	if ((p = strstr(mntops, "file=")) != NULL) {
470		vnodefile = strdup(p + sizeof("file=") - 1);
471		p = strchr(vnodefile, ',');
472		if (p != NULL)
473			*p = '\0';
474	}
475	if (vnodefile == NULL) {
476		warnx("file option not found for %s", name);
477		return (NULL);
478	}
479
480	if (which_prog == SWAPON) {
481		if (mdunit == -1) {
482			error = run_cmd(&fd, "%s -l -n -f %s",
483			    _PATH_MDCONFIG, vnodefile);
484			if (error == 0) {
485				/* md device found.  Ignore it. */
486				close(fd);
487				if (!qflag)
488					warnx("%s: Device already in use",
489					    vnodefile);
490				free(vnodefile);
491				return (NULL);
492			}
493			error = run_cmd(&fd, "%s -a -t vnode -n -f %s",
494			    _PATH_MDCONFIG, vnodefile);
495			if (error) {
496				warnx("mdconfig (attach) error: file=%s",
497				    vnodefile);
498				free(vnodefile);
499				return (NULL);
500			}
501			sfd = fdopen(fd, "r");
502			if (sfd == NULL) {
503				warn("mdconfig (attach) fdopen error");
504				ret = NULL;
505				goto err;
506			}
507			p = fgetln(sfd, &linelen);
508			if (p == NULL &&
509			    (linelen < 2 || linelen > sizeof(linebuf))) {
510				warn("mdconfig (attach) unexpected output");
511				ret = NULL;
512				goto err;
513			}
514			strncpy(linebuf, p, linelen);
515			linebuf[linelen - 1] = '\0';
516			errno = 0;
517			ul = strtoul(linebuf, &p, 10);
518			if (errno == 0) {
519				if (*p != '\0' || ul > INT_MAX)
520					errno = EINVAL;
521			}
522			if (errno) {
523				warn("mdconfig (attach) unexpected output: %s",
524				    linebuf);
525				ret = NULL;
526				goto err;
527			}
528			mdunit = (int)ul;
529		} else {
530			error = run_cmd(&fd, "%s -l -n -f %s -u %d",
531			    _PATH_MDCONFIG, vnodefile, mdunit);
532			if (error == 0) {
533				/* md device found.  Ignore it. */
534				close(fd);
535				if (qflag == 0)
536					warnx("md%d on %s: Device already "
537					    "in use", mdunit, vnodefile);
538				free(vnodefile);
539				return (NULL);
540			}
541			error = run_cmd(NULL, "%s -a -t vnode -u %d -f %s",
542			    _PATH_MDCONFIG, mdunit, vnodefile);
543			if (error) {
544				warnx("mdconfig (attach) error: "
545				    "md%d on file=%s", mdunit, vnodefile);
546				free(vnodefile);
547				return (NULL);
548			}
549		}
550	} else /* SWAPOFF */ {
551		if (mdunit == -1) {
552			error = run_cmd(&fd, "%s -l -n -f %s",
553			    _PATH_MDCONFIG, vnodefile);
554			if (error) {
555				/* md device not found.  Ignore it. */
556				close(fd);
557				if (!qflag)
558					warnx("md on %s: Device not found",
559					    vnodefile);
560				free(vnodefile);
561				return (NULL);
562			}
563			sfd = fdopen(fd, "r");
564			if (sfd == NULL) {
565				warn("mdconfig (list) fdopen error");
566				ret = NULL;
567				goto err;
568			}
569			p = fgetln(sfd, &linelen);
570			if (p == NULL &&
571			    (linelen < 2 || linelen > sizeof(linebuf) - 1)) {
572				warn("mdconfig (list) unexpected output");
573				ret = NULL;
574				goto err;
575			}
576			strncpy(linebuf, p, linelen);
577			linebuf[linelen - 1] = '\0';
578			p = strchr(linebuf, ' ');
579			if (p != NULL)
580				*p = '\0';
581			errno = 0;
582			ul = strtoul(linebuf, &p, 10);
583			if (errno == 0) {
584				if (*p != '\0' || ul > INT_MAX)
585					errno = EINVAL;
586			}
587			if (errno) {
588				warn("mdconfig (list) unexpected output: %s",
589				    linebuf);
590				ret = NULL;
591				goto err;
592			}
593			mdunit = (int)ul;
594		} else {
595			error = run_cmd(&fd, "%s -l -n -f %s -u %d",
596			    _PATH_MDCONFIG, vnodefile, mdunit);
597			if (error) {
598				/* md device not found.  Ignore it. */
599				close(fd);
600				if (!qflag)
601					warnx("md%d on %s: Device not found",
602					    mdunit, vnodefile);
603				free(vnodefile);
604				return (NULL);
605			}
606		}
607	}
608	snprintf(mdpath, sizeof(mdpath), "%s%s%d", _PATH_DEV,
609	    MD_NAME, mdunit);
610	mdpath[sizeof(mdpath) - 1] = '\0';
611	ret = swap_on_off_sfile(mdpath, doingall);
612
613	if (which_prog == SWAPOFF) {
614		if (ret != NULL) {
615			error = run_cmd(NULL, "%s -d -u %d",
616			    _PATH_MDCONFIG, mdunit);
617			if (error)
618				warn("mdconfig (detach) detach failed: %s%s%d",
619				    _PATH_DEV, MD_NAME, mdunit);
620		}
621	}
622err:
623	if (sfd != NULL)
624		fclose(sfd);
625	if (fd != -1)
626		close(fd);
627	free(vnodefile);
628	return (ret);
629}
630
631static int
632run_cmd(int *ofd, const char *cmdline, ...)
633{
634	va_list ap;
635	char **argv, **argvp, *cmd, *p;
636	int argc, pid, status, rv;
637	int pfd[2], nfd, dup2dn;
638
639	va_start(ap, cmdline);
640	rv = vasprintf(&cmd, cmdline, ap);
641	if (rv == -1) {
642		warn("%s", __func__);
643		return (rv);
644	}
645	va_end(ap);
646
647	for (argc = 1, p = cmd; (p = strchr(p, ' ')) != NULL; p++)
648		argc++;
649	argv = (char **)malloc(sizeof(*argv) * (argc + 1));
650	for (p = cmd, argvp = argv; (*argvp = strsep(&p, " ")) != NULL;)
651		if (**argvp != '\0' && (++argvp > &argv[argc])) {
652			*argvp = NULL;
653			break;
654		}
655	/* The argv array ends up NULL-terminated here. */
656#if 0
657	{
658		int i;
659
660		fprintf(stderr, "DEBUG: running:");
661		/* Should be equivalent to 'cmd' (before strsep, of course). */
662		for (i = 0; argv[i] != NULL; i++)
663			fprintf(stderr, " %s", argv[i]);
664		fprintf(stderr, "\n");
665	}
666#endif
667	dup2dn = 1;
668	if (ofd != NULL) {
669		if (pipe(&pfd[0]) == -1) {
670			warn("%s: pipe", __func__);
671			return (-1);
672		}
673		*ofd = pfd[0];
674		dup2dn = 0;
675	}
676	pid = fork();
677	switch (pid) {
678	case 0:
679		/* Child process. */
680		if (ofd != NULL)
681			if (dup2(pfd[1], STDOUT_FILENO) < 0)
682				err(1, "dup2 in %s", __func__);
683		nfd = open(_PATH_DEVNULL, O_RDWR);
684		if (nfd == -1)
685			err(1, "%s: open %s", __func__, _PATH_DEVNULL);
686		if (dup2(nfd, STDIN_FILENO) < 0)
687			err(1, "%s: dup2", __func__);
688		if (dup2dn && dup2(nfd, STDOUT_FILENO) < 0)
689			err(1, "%s: dup2", __func__);
690		if (dup2(nfd, STDERR_FILENO) < 0)
691			err(1, "%s: dup2", __func__);
692		execv(argv[0], argv);
693		warn("exec: %s", argv[0]);
694		_exit(-1);
695	case -1:
696		err(1, "%s: fork", __func__);
697	}
698	free(cmd);
699	free(argv);
700	while (waitpid(pid, &status, 0) != pid)
701		;
702	return (WEXITSTATUS(status));
703}
704
705static const char *
706swap_on_off_sfile(const char *name, int doingall)
707{
708	int error;
709
710	if (which_prog == SWAPON)
711		error = swapon(name);
712	else /* SWAPOFF */
713		error = swapoff(name);
714
715	if (error == -1) {
716		switch (errno) {
717		case EBUSY:
718			if (doingall == 0)
719				warnx("%s: Device already in use", name);
720			break;
721		case EINVAL:
722			if (which_prog == SWAPON)
723				warnx("%s: NSWAPDEV limit reached", name);
724			else if (doingall == 0)
725				warn("%s", name);
726			break;
727		default:
728			warn("%s", name);
729			break;
730		}
731		return (NULL);
732	}
733	return (name);
734}
735
736static void
737usage(void)
738{
739
740	fprintf(stderr, "usage: %s ", getprogname());
741	switch(orig_prog) {
742	case SWAPON:
743	case SWAPOFF:
744	    fprintf(stderr, "[-F fstab] -aLq | file ...\n");
745	    break;
746	case SWAPCTL:
747	    fprintf(stderr, "[-AghklmsU] [-a file ... | -d file ...]\n");
748	    break;
749	}
750	exit(1);
751}
752
753static void
754sizetobuf(char *buf, size_t bufsize, int hflag, long long val, int hlen,
755    long blocksize)
756{
757	char tmp[16];
758
759	if (hflag == 'H') {
760		humanize_number(tmp, 5, (int64_t)val, "", HN_AUTOSCALE,
761		    HN_B | HN_NOSPACE | HN_DECIMAL);
762		snprintf(buf, bufsize, "%*s", hlen, tmp);
763	} else
764		snprintf(buf, bufsize, "%*lld", hlen, val / blocksize);
765}
766
767static void
768swaplist(int lflag, int sflag, int hflag)
769{
770	size_t mibsize, size;
771	struct xswdev xsw;
772	int hlen, mib[16], n, pagesize;
773	long blocksize;
774	long long total = 0;
775	long long used = 0;
776	long long tmp_total;
777	long long tmp_used;
778	char buf[32];
779
780	pagesize = getpagesize();
781	switch(hflag) {
782	case 'G':
783		blocksize = 1024 * 1024 * 1024;
784		strlcpy(buf, "1GB-blocks", sizeof(buf));
785		hlen = 10;
786		break;
787	case 'H':
788		blocksize = -1;
789		strlcpy(buf, "Bytes", sizeof(buf));
790		hlen = 10;
791		break;
792	case 'K':
793		blocksize = 1024;
794		strlcpy(buf, "1kB-blocks", sizeof(buf));
795		hlen = 10;
796		break;
797	case 'M':
798		blocksize = 1024 * 1024;
799		strlcpy(buf, "1MB-blocks", sizeof(buf));
800		hlen = 10;
801		break;
802	default:
803		getbsize(&hlen, &blocksize);
804		snprintf(buf, sizeof(buf), "%ld-blocks", blocksize);
805		break;
806	}
807
808	mibsize = nitems(mib);
809	if (sysctlnametomib("vm.swap_info", mib, &mibsize) == -1)
810		err(1, "sysctlnametomib()");
811
812	if (lflag) {
813		printf("%-13s %*s %*s\n",
814		    "Device:",
815		    hlen, buf,
816		    hlen, "Used:");
817	}
818
819	for (n = 0; ; ++n) {
820		mib[mibsize] = n;
821		size = sizeof xsw;
822		if (sysctl(mib, mibsize + 1, &xsw, &size, NULL, 0) == -1)
823			break;
824		if (xsw.xsw_version != XSWDEV_VERSION)
825			errx(1, "xswdev version mismatch");
826
827		tmp_total = (long long)xsw.xsw_nblks * pagesize;
828		tmp_used  = (long long)xsw.xsw_used * pagesize;
829		total += tmp_total;
830		used  += tmp_used;
831		if (lflag) {
832			sizetobuf(buf, sizeof(buf), hflag, tmp_total, hlen,
833			    blocksize);
834			printf("/dev/%-8s %s ", devname(xsw.xsw_dev, S_IFCHR),
835			    buf);
836			sizetobuf(buf, sizeof(buf), hflag, tmp_used, hlen,
837			    blocksize);
838			printf("%s\n", buf);
839		}
840	}
841	if (errno != ENOENT)
842		err(1, "sysctl()");
843
844	if (sflag) {
845		sizetobuf(buf, sizeof(buf), hflag, total, hlen, blocksize);
846		printf("Total:        %s ", buf);
847		sizetobuf(buf, sizeof(buf), hflag, used, hlen, blocksize);
848		printf("%s\n", buf);
849	}
850}
851
852