mt.c revision 152396 
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 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifndef lint
35static const char copyright[] =
36"@(#) Copyright (c) 1980, 1993\n\
37	The Regents of the University of California.  All rights reserved.\n";
38#endif /* not lint */
39
40#ifndef lint
41#if 0
42static char sccsid[] = "@(#)mt.c	8.2 (Berkeley) 5/4/95";
43#endif
44#endif /* not lint */
45
46#include <sys/cdefs.h>
47__FBSDID("$FreeBSD: head/usr.bin/mt/mt.c 152396 2005-11-13 20:50:17Z dwmalone $");
48
49/*
50 * mt --
51 *   magnetic tape manipulation program
52 */
53#include <sys/types.h>
54#include <sys/ioctl.h>
55#include <sys/mtio.h>
56
57#include <ctype.h>
58#include <err.h>
59#include <fcntl.h>
60#include <stdio.h>
61#include <stdlib.h>
62#include <string.h>
63#include <unistd.h>
64
65/* the appropriate sections of <sys/mtio.h> are also #ifdef'd for FreeBSD */
66/* c_flags */
67#define NEED_2ARGS	0x01
68#define ZERO_ALLOWED	0x02
69#define IS_DENSITY	0x04
70#define DISABLE_THIS	0x08
71#define IS_COMP		0x10
72
73#ifndef TRUE
74#define TRUE 1
75#endif
76#ifndef FALSE
77#define FALSE 0
78#endif
79
80struct commands {
81	const char *c_name;
82	int c_code;
83	int c_ronly;
84	int c_flags;
85} com[] = {
86	{ "bsf",	MTBSF,	1, 0 },
87	{ "bsr",	MTBSR,	1, 0 },
88	/* XXX FreeBSD considered "eof" dangerous, since it's being
89	   confused with "eom" (and is an alias for "weof" anyway) */
90	{ "eof",	MTWEOF, 0, DISABLE_THIS },
91	{ "fsf",	MTFSF,	1, 0 },
92	{ "fsr",	MTFSR,	1, 0 },
93	{ "offline",	MTOFFL,	1, 0 },
94	{ "rewind",	MTREW,	1, 0 },
95	{ "rewoffl",	MTOFFL,	1, 0 },
96	{ "status",	MTNOP,	1, 0 },
97	{ "weof",	MTWEOF,	0, ZERO_ALLOWED },
98	{ "erase",	MTERASE, 0, ZERO_ALLOWED},
99	{ "blocksize",	MTSETBSIZ, 0, NEED_2ARGS|ZERO_ALLOWED },
100	{ "density",	MTSETDNSTY, 0, NEED_2ARGS|ZERO_ALLOWED|IS_DENSITY },
101	{ "eom",	MTEOD, 1, 0 },
102	{ "eod",	MTEOD, 1, 0 },
103	{ "smk",	MTWSS, 0, 0 },
104	{ "wss",	MTWSS, 0, 0 },
105	{ "fss",	MTFSS, 1, 0 },
106	{ "bss",	MTBSS, 1, 0 },
107	{ "comp",	MTCOMP, 0, NEED_2ARGS|ZERO_ALLOWED|IS_COMP },
108	{ "retension",	MTRETENS, 1, 0 },
109	{ "rdhpos",     MTIOCRDHPOS,  0, 0 },
110	{ "rdspos",     MTIOCRDSPOS,  0, 0 },
111	{ "sethpos",    MTIOCHLOCATE, 0, NEED_2ARGS|ZERO_ALLOWED },
112	{ "setspos",    MTIOCSLOCATE, 0, NEED_2ARGS|ZERO_ALLOWED },
113	{ "errstat",	MTIOCERRSTAT, 0, 0 },
114	{ "setmodel",	MTIOCSETEOTMODEL, 0, NEED_2ARGS|ZERO_ALLOWED },
115	{ "seteotmodel",	MTIOCSETEOTMODEL, 0, NEED_2ARGS|ZERO_ALLOWED },
116	{ "getmodel",	MTIOCGETEOTMODEL, 0, 0 },
117	{ "geteotmodel",	MTIOCGETEOTMODEL, 0, 0 },
118	{ NULL, 0, 0, 0 }
119};
120
121const char *getblksiz(int);
122void printreg(const char *, u_int, const char *);
123void status(struct mtget *);
124void usage(void);
125void st_status (struct mtget *);
126int stringtodens (const char *s);
127const char *denstostring (int d);
128int denstobp(int d, int bpi);
129u_int32_t stringtocomp(const char *s);
130const char *comptostring(u_int32_t comp);
131void warn_eof(void);
132
133int
134main(int argc, char *argv[])
135{
136	struct commands *comp;
137	struct mtget mt_status;
138	struct mtop mt_com;
139	int ch, len, mtfd;
140	const char *p, *tape;
141
142	if ((tape = getenv("TAPE")) == NULL)
143		tape = DEFTAPE;
144
145	while ((ch = getopt(argc, argv, "f:t:")) != -1)
146		switch(ch) {
147		case 'f':
148		case 't':
149			tape = optarg;
150			break;
151		case '?':
152		default:
153			usage();
154		}
155	argc -= optind;
156	argv += optind;
157
158	if (argc < 1 || argc > 2)
159		usage();
160
161	len = strlen(p = *argv++);
162	for (comp = com;; comp++) {
163		if (comp->c_name == NULL)
164			errx(1, "%s: unknown command", p);
165		if (strncmp(p, comp->c_name, len) == 0)
166			break;
167	}
168	if((comp->c_flags & NEED_2ARGS) && argc != 2)
169		usage();
170	if(comp->c_flags & DISABLE_THIS) {
171		warn_eof();
172	}
173	if ((mtfd = open(tape, comp->c_ronly ? O_RDONLY : O_RDWR)) < 0)
174		err(1, "%s", tape);
175	if (comp->c_code != MTNOP) {
176		mt_com.mt_op = comp->c_code;
177		if (*argv) {
178			if (!isdigit(**argv) &&
179			    (comp->c_flags & IS_DENSITY)) {
180				const char *dcanon;
181				mt_com.mt_count = stringtodens(*argv);
182				if (mt_com.mt_count == 0)
183					errx(1, "%s: unknown density", *argv);
184				dcanon = denstostring(mt_com.mt_count);
185				if (strcmp(dcanon, *argv) != 0)
186					printf(
187					"Using \"%s\" as an alias for %s\n",
188					       *argv, dcanon);
189				p = "";
190			} else if (!isdigit(**argv) &&
191				   (comp->c_flags & IS_COMP)) {
192
193				mt_com.mt_count = stringtocomp(*argv);
194				if ((u_int32_t)mt_com.mt_count == 0xf0f0f0f0)
195					errx(1, "%s: unknown compression",
196					     *argv);
197				p = "";
198			} else {
199				char *q;
200				/* allow for hex numbers; useful for density */
201				mt_com.mt_count = strtol(*argv, &q, 0);
202				p = q;
203			}
204			if ((mt_com.mt_count <=
205			    ((comp->c_flags & ZERO_ALLOWED)? -1: 0)
206			    && ((comp->c_flags & IS_COMP) == 0)
207			    ) || *p)
208				errx(1, "%s: illegal count", *argv);
209		}
210		else
211			mt_com.mt_count = 1;
212		switch (comp->c_code) {
213		case MTIOCERRSTAT:
214		{
215			unsigned int i;
216			union mterrstat umn;
217			struct scsi_tape_errors *s = &umn.scsi_errstat;
218
219			if (ioctl(mtfd, comp->c_code, (caddr_t)&umn) < 0)
220				err(2, "%s", tape);
221			(void)printf("Last I/O Residual: %u\n", s->io_resid);
222			(void)printf(" Last I/O Command:");
223			for (i = 0; i < sizeof (s->io_cdb); i++)
224				(void)printf(" %02X", s->io_cdb[i]);
225			(void)printf("\n");
226			(void)printf("   Last I/O Sense:\n\n\t");
227			for (i = 0; i < sizeof (s->io_sense); i++) {
228				(void)printf(" %02X", s->io_sense[i]);
229				if (((i + 1) & 0xf) == 0) {
230					(void)printf("\n\t");
231				}
232			}
233			(void)printf("\n");
234			(void)printf("Last Control Residual: %u\n",
235			    s->ctl_resid);
236			(void)printf(" Last Control Command:");
237			for (i = 0; i < sizeof (s->ctl_cdb); i++)
238				(void)printf(" %02X", s->ctl_cdb[i]);
239			(void)printf("\n");
240			(void)printf("   Last Control Sense:\n\n\t");
241			for (i = 0; i < sizeof (s->ctl_sense); i++) {
242				(void)printf(" %02X", s->ctl_sense[i]);
243				if (((i + 1) & 0xf) == 0) {
244					(void)printf("\n\t");
245				}
246			}
247			(void)printf("\n\n");
248			exit(0);
249			/* NOTREACHED */
250		}
251		case MTIOCRDHPOS:
252		case MTIOCRDSPOS:
253		{
254			u_int32_t block;
255			if (ioctl(mtfd, comp->c_code, (caddr_t)&block) < 0)
256				err(2, "%s", tape);
257			(void)printf("%s: %s block location %u\n", tape,
258			    (comp->c_code == MTIOCRDHPOS)? "hardware" :
259			    "logical", block);
260			exit(0);
261			/* NOTREACHED */
262		}
263		case MTIOCSLOCATE:
264		case MTIOCHLOCATE:
265		{
266			u_int32_t block = (u_int32_t)mt_com.mt_count;
267			if (ioctl(mtfd, comp->c_code, (caddr_t)&block) < 0)
268				err(2, "%s", tape);
269			exit(0);
270			/* NOTREACHED */
271		}
272		case MTIOCGETEOTMODEL:
273		{
274			u_int32_t om;
275			if (ioctl(mtfd, MTIOCGETEOTMODEL, (caddr_t)&om) < 0)
276				err(2, "%s", tape);
277			(void)printf("%s: the model is %u filemar%s at EOT\n",
278			    tape, om, (om > 1)? "ks" : "k");
279			exit(0);
280			/* NOTREACHED */
281		}
282		case MTIOCSETEOTMODEL:
283		{
284			u_int32_t om, nm = (u_int32_t)mt_com.mt_count;
285			if (ioctl(mtfd, MTIOCGETEOTMODEL, (caddr_t)&om) < 0)
286				err(2, "%s", tape);
287			if (ioctl(mtfd, comp->c_code, (caddr_t)&nm) < 0)
288				err(2, "%s", tape);
289			(void)printf("%s: old model was %u filemar%s at EOT\n",
290			    tape, om, (om > 1)? "ks" : "k");
291			(void)printf("%s: new model  is %u filemar%s at EOT\n",
292			    tape, nm, (nm > 1)? "ks" : "k");
293			exit(0);
294			/* NOTREACHED */
295		}
296		default:
297			break;
298		}
299		if (ioctl(mtfd, MTIOCTOP, &mt_com) < 0)
300			err(1, "%s: %s", tape, comp->c_name);
301	} else {
302		if (ioctl(mtfd, MTIOCGET, &mt_status) < 0)
303			err(1, NULL);
304		status(&mt_status);
305	}
306	exit(0);
307	/* NOTREACHED */
308}
309
310struct tape_desc {
311	short	t_type;		/* type of magtape device */
312	const char *t_name;	/* printing name */
313	const char *t_dsbits;	/* "drive status" register */
314	const char *t_erbits;	/* "error" register */
315} tapes[] = {
316	{ MT_ISAR,	"SCSI tape drive", 0,		0 },
317	{ 0, NULL, 0, 0 }
318};
319
320/*
321 * Interpret the status buffer returned
322 */
323void
324status(struct mtget *bp)
325{
326	struct tape_desc *mt;
327
328	for (mt = tapes;; mt++) {
329		if (mt->t_type == 0) {
330			(void)printf("%d: unknown tape drive type\n",
331			    bp->mt_type);
332			return;
333		}
334		if (mt->t_type == bp->mt_type)
335			break;
336	}
337	if(mt->t_type == MT_ISAR)
338		st_status(bp);
339	else {
340		(void)printf("%s tape drive, residual=%d\n",
341		    mt->t_name, bp->mt_resid);
342		printreg("ds", (unsigned short)bp->mt_dsreg, mt->t_dsbits);
343		printreg("\ner", (unsigned short)bp->mt_erreg, mt->t_erbits);
344		(void)putchar('\n');
345	}
346}
347
348/*
349 * Print a register a la the %b format of the kernel's printf.
350 */
351void
352printreg(const char *s, u_int v, const char *bits)
353{
354	int i, any = 0;
355	char c;
356
357	if (bits && *bits == 8)
358		printf("%s=%o", s, v);
359	else
360		printf("%s=%x", s, v);
361	if (!bits)
362		return;
363	bits++;
364	if (v && bits) {
365		putchar('<');
366		while ((i = *bits++)) {
367			if (v & (1 << (i-1))) {
368				if (any)
369					putchar(',');
370				any = 1;
371				for (; (c = *bits) > 32; bits++)
372					putchar(c);
373			} else
374				for (; *bits > 32; bits++)
375					;
376		}
377		putchar('>');
378	}
379}
380
381void
382usage(void)
383{
384	(void)fprintf(stderr, "usage: mt [-f device] command [count]\n");
385	exit(1);
386}
387
388struct densities {
389	int dens;
390	int bpmm;
391	int bpi;
392	const char *name;
393} dens[] = {
394	/*
395	 * Taken from T10 Project 997D
396	 * SCSI-3 Stream Device Commands (SSC)
397	 * Revision 11, 4-Nov-97
398	 */
399	/*Num.  bpmm    bpi     Reference     */
400	{ 0x1,	32,	800,	"X3.22-1983" },
401	{ 0x2,	63,	1600,	"X3.39-1986" },
402	{ 0x3,	246,	6250,	"X3.54-1986" },
403	{ 0x5,	315,	8000,	"X3.136-1986" },
404	{ 0x6,	126,	3200,	"X3.157-1987" },
405	{ 0x7,	252,	6400,	"X3.116-1986" },
406	{ 0x8,	315,	8000,	"X3.158-1987" },
407	{ 0x9,	491,	37871,	"X3.180" },
408	{ 0xA,	262,	6667,	"X3B5/86-199" },
409	{ 0xB,	63,	1600,	"X3.56-1986" },
410	{ 0xC,	500,	12690,	"HI-TC1" },
411	{ 0xD,	999,	25380,	"HI-TC2" },
412	{ 0xF,	394,	10000,	"QIC-120" },
413	{ 0x10,	394,	10000,	"QIC-150" },
414	{ 0x11,	630,	16000,	"QIC-320" },
415	{ 0x12,	2034,	51667,	"QIC-1350" },
416	{ 0x13,	2400,	61000,	"X3B5/88-185A" },
417	{ 0x14,	1703,	43245,	"X3.202-1991" },
418	{ 0x15,	1789,	45434,	"ECMA TC17" },
419	{ 0x16,	394,	10000,	"X3.193-1990" },
420	{ 0x17,	1673,	42500,	"X3B5/91-174" },
421	{ 0x18,	1673,	42500,	"X3B5/92-50" },
422	{ 0x19, 2460,   62500,  "DLTapeIII" },
423	{ 0x1A, 3214,   81633,  "DLTapeIV(20GB)" },
424	{ 0x1B, 3383,   85937,  "DLTapeIV(35GB)" },
425	{ 0x1C, 1654,	42000,	"QIC-385M" },
426	{ 0x1D,	1512,	38400,	"QIC-410M" },
427	{ 0x1E, 1385,	36000,	"QIC-1000C" },
428	{ 0x1F,	2666,	67733,	"QIC-2100C" },
429	{ 0x20, 2666,	67733,	"QIC-6GB(M)" },
430	{ 0x21,	2666,	67733,	"QIC-20GB(C)" },
431	{ 0x22,	1600,	40640,	"QIC-2GB(C)" },
432	{ 0x23, 2666,	67733,	"QIC-875M" },
433	{ 0x24,	2400,	61000,	"DDS-2" },
434	{ 0x25,	3816,	97000,	"DDS-3" },
435	{ 0x26,	3816,	97000,	"DDS-4" },
436	{ 0x27,	3056,	77611,	"Mammoth" },
437	{ 0x28,	1491,	37871,	"X3.224" },
438	{ 0x41, 3868,   98250,  "DLTapeIV(40GB)" },
439	{ 0x48, 5236,   133000, "SDLTapeI(110)" },
440	{ 0x49, 7598,   193000, "SDLTapeI(160)" },
441	{ 0, 0, 0, NULL }
442};
443
444struct compression_types {
445	u_int32_t	comp_number;
446	const char 	*name;
447} comp_types[] = {
448	{ 0x00, "none" },
449	{ 0x00, "off" },
450	{ 0x10, "IDRC" },
451	{ 0x20, "DCLZ" },
452	{ 0xffffffff, "enable" },
453	{ 0xffffffff, "on" },
454	{ 0xf0f0f0f0, NULL}
455};
456
457const char *
458denstostring(int d)
459{
460	static char buf[20];
461	struct densities *sd;
462
463	/* densities 0 and 0x7f are handled as special cases */
464	if (d == 0)
465		return "default";
466	if (d == 0x7f)
467		return "same";
468	for (sd = dens; sd->dens; sd++)
469		if (sd->dens == d)
470			break;
471	if (sd->dens == 0)
472		sprintf(buf, "0x%02x", d);
473	else
474		sprintf(buf, "0x%02x:%s", d, sd->name);
475	return buf;
476}
477
478/*
479 * Given a specific density number, return either the bits per inch or bits
480 * per millimeter for the given density.
481 */
482int
483denstobp(int d, int bpi)
484{
485	struct densities *sd;
486
487	for (sd = dens; sd->dens; sd++)
488		if (sd->dens == d)
489			break;
490	if (sd->dens == 0)
491		return(0);
492	else {
493		if (bpi)
494			return(sd->bpi);
495		else
496			return(sd->bpmm);
497	}
498}
499
500int
501stringtodens(const char *s)
502{
503	struct densities *sd;
504	size_t l = strlen(s);
505
506	for (sd = dens; sd->dens; sd++)
507		if (strncasecmp(sd->name, s, l) == 0)
508			break;
509	return sd->dens;
510}
511
512
513const char *
514getblksiz(int bs)
515{
516	static char buf[25];
517	if (bs == 0)
518		return "variable";
519	else {
520		sprintf(buf, "%d bytes", bs);
521		return buf;
522	}
523}
524
525const char *
526comptostring(u_int32_t comp)
527{
528	static char buf[20];
529	struct compression_types *ct;
530
531	if (comp == MT_COMP_DISABLED)
532		return "disabled";
533	else if (comp == MT_COMP_UNSUPP)
534		return "unsupported";
535
536	for (ct = comp_types; ct->name; ct++)
537		if (ct->comp_number == comp)
538			break;
539
540	if (ct->comp_number == 0xf0f0f0f0) {
541		sprintf(buf, "0x%x", comp);
542		return(buf);
543	} else
544		return(ct->name);
545}
546
547u_int32_t
548stringtocomp(const char *s)
549{
550	struct compression_types *ct;
551	size_t l = strlen(s);
552
553	for (ct = comp_types; ct->name; ct++)
554		if (strncasecmp(ct->name, s, l) == 0)
555			break;
556
557	return(ct->comp_number);
558}
559
560void
561st_status(struct mtget *bp)
562{
563	printf("Mode      Density              Blocksize      bpi      "
564	       "Compression\n"
565	       "Current:  %-17s    %-12s   %-7d  %s\n"
566	       "---------available modes---------\n"
567	       "0:        %-17s    %-12s   %-7d  %s\n"
568	       "1:        %-17s    %-12s   %-7d  %s\n"
569	       "2:        %-17s    %-12s   %-7d  %s\n"
570	       "3:        %-17s    %-12s   %-7d  %s\n",
571	       denstostring(bp->mt_density), getblksiz(bp->mt_blksiz),
572	       denstobp(bp->mt_density, TRUE), comptostring(bp->mt_comp),
573	       denstostring(bp->mt_density0), getblksiz(bp->mt_blksiz0),
574	       denstobp(bp->mt_density0, TRUE), comptostring(bp->mt_comp0),
575	       denstostring(bp->mt_density1), getblksiz(bp->mt_blksiz1),
576	       denstobp(bp->mt_density1, TRUE), comptostring(bp->mt_comp1),
577	       denstostring(bp->mt_density2), getblksiz(bp->mt_blksiz2),
578	       denstobp(bp->mt_density2, TRUE), comptostring(bp->mt_comp2),
579	       denstostring(bp->mt_density3), getblksiz(bp->mt_blksiz3),
580	       denstobp(bp->mt_density3, TRUE), comptostring(bp->mt_comp3));
581
582	if (bp->mt_dsreg != MTIO_DSREG_NIL) {
583		auto char foo[32];
584		const char sfmt[] = "Current Driver State: %s.\n";
585		printf("---------------------------------\n");
586		switch (bp->mt_dsreg) {
587		case MTIO_DSREG_REST:
588			printf(sfmt, "at rest");
589			break;
590		case MTIO_DSREG_RBSY:
591			printf(sfmt, "Communicating with drive");
592			break;
593		case MTIO_DSREG_WR:
594			printf(sfmt, "Writing");
595			break;
596		case MTIO_DSREG_FMK:
597			printf(sfmt, "Writing Filemarks");
598			break;
599		case MTIO_DSREG_ZER:
600			printf(sfmt, "Erasing");
601			break;
602		case MTIO_DSREG_RD:
603			printf(sfmt, "Reading");
604			break;
605		case MTIO_DSREG_FWD:
606			printf(sfmt, "Spacing Forward");
607			break;
608		case MTIO_DSREG_REV:
609			printf(sfmt, "Spacing Reverse");
610			break;
611		case MTIO_DSREG_POS:
612			printf(sfmt,
613			    "Hardware Positioning (direction unknown)");
614			break;
615		case MTIO_DSREG_REW:
616			printf(sfmt, "Rewinding");
617			break;
618		case MTIO_DSREG_TEN:
619			printf(sfmt, "Retensioning");
620			break;
621		case MTIO_DSREG_UNL:
622			printf(sfmt, "Unloading");
623			break;
624		case MTIO_DSREG_LD:
625			printf(sfmt, "Loading");
626			break;
627		default:
628			(void) sprintf(foo, "Unknown state 0x%x", bp->mt_dsreg);
629			printf(sfmt, foo);
630			break;
631		}
632	}
633	if (bp->mt_resid == 0 && bp->mt_fileno == (daddr_t) -1 &&
634	    bp->mt_blkno == (daddr_t) -1)
635		return;
636	printf("---------------------------------\n");
637	printf("File Number: %d\tRecord Number: %d\tResidual Count %d\n",
638	    bp->mt_fileno, bp->mt_blkno, bp->mt_resid);
639}
640
641void
642warn_eof(void)
643{
644	fprintf(stderr,
645		"The \"eof\" command has been disabled.\n"
646		"Use \"weof\" if you really want to write end-of-file marks,\n"
647		"or \"eom\" if you rather want to skip to the end of "
648		"recorded medium.\n");
649	exit(1);
650}
651