mt.c revision 128053 
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 128053 2004-04-09 14:19:12Z mux $");
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	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, 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(argc, argv)
135	int argc;
136	char *argv[];
137{
138	register struct commands *comp;
139	struct mtget mt_status;
140	struct mtop mt_com;
141	int ch, len, mtfd;
142	char *p, *tape;
143
144	if ((tape = getenv("TAPE")) == NULL)
145		tape = DEFTAPE;
146
147	while ((ch = getopt(argc, argv, "f:t:")) != -1)
148		switch(ch) {
149		case 'f':
150		case 't':
151			tape = optarg;
152			break;
153		case '?':
154		default:
155			usage();
156		}
157	argc -= optind;
158	argv += optind;
159
160	if (argc < 1 || argc > 2)
161		usage();
162
163	len = strlen(p = *argv++);
164	for (comp = com;; comp++) {
165		if (comp->c_name == NULL)
166			errx(1, "%s: unknown command", p);
167		if (strncmp(p, comp->c_name, len) == 0)
168			break;
169	}
170	if((comp->c_flags & NEED_2ARGS) && argc != 2)
171		usage();
172	if(comp->c_flags & DISABLE_THIS) {
173		warn_eof();
174	}
175	if ((mtfd = open(tape, comp->c_ronly ? O_RDONLY : O_RDWR)) < 0)
176		err(1, "%s", tape);
177	if (comp->c_code != MTNOP) {
178		mt_com.mt_op = comp->c_code;
179		if (*argv) {
180			if (!isdigit(**argv) &&
181			    (comp->c_flags & IS_DENSITY)) {
182				const char *dcanon;
183				mt_com.mt_count = stringtodens(*argv);
184				if (mt_com.mt_count == 0)
185					errx(1, "%s: unknown density", *argv);
186				dcanon = denstostring(mt_com.mt_count);
187				if (strcmp(dcanon, *argv) != 0)
188					printf(
189					"Using \"%s\" as an alias for %s\n",
190					       *argv, dcanon);
191				p = "";
192			} else if (!isdigit(**argv) &&
193				   (comp->c_flags & IS_COMP)) {
194
195				mt_com.mt_count = stringtocomp(*argv);
196				if ((u_int32_t)mt_com.mt_count == 0xf0f0f0f0)
197					errx(1, "%s: unknown compression",
198					     *argv);
199				p = "";
200			} else
201				/* allow for hex numbers; useful for density */
202				mt_com.mt_count = strtol(*argv, &p, 0);
203			if ((mt_com.mt_count <=
204			    ((comp->c_flags & ZERO_ALLOWED)? -1: 0)
205			    && ((comp->c_flags & IS_COMP) == 0)
206			    ) || *p)
207				errx(1, "%s: illegal count", *argv);
208		}
209		else
210			mt_com.mt_count = 1;
211		switch (comp->c_code) {
212		case MTIOCERRSTAT:
213		{
214			unsigned int i;
215			union mterrstat umn;
216			struct scsi_tape_errors *s = &umn.scsi_errstat;
217
218			if (ioctl(mtfd, comp->c_code, (caddr_t)&umn) < 0)
219				err(2, "%s", tape);
220			(void)printf("Last I/O Residual: %u\n", s->io_resid);
221			(void)printf(" Last I/O Command:");
222			for (i = 0; i < sizeof (s->io_cdb); i++)
223				(void)printf(" %02X", s->io_cdb[i]);
224			(void)printf("\n");
225			(void)printf("   Last I/O Sense:\n\n\t");
226			for (i = 0; i < sizeof (s->io_sense); i++) {
227				(void)printf(" %02X", s->io_sense[i]);
228				if (((i + 1) & 0xf) == 0) {
229					(void)printf("\n\t");
230				}
231			}
232			(void)printf("\n");
233			(void)printf("Last Control Residual: %u\n",
234			    s->ctl_resid);
235			(void)printf(" Last Control Command:");
236			for (i = 0; i < sizeof (s->ctl_cdb); i++)
237				(void)printf(" %02X", s->ctl_cdb[i]);
238			(void)printf("\n");
239			(void)printf("   Last Control Sense:\n\n\t");
240			for (i = 0; i < sizeof (s->ctl_sense); i++) {
241				(void)printf(" %02X", s->ctl_sense[i]);
242				if (((i + 1) & 0xf) == 0) {
243					(void)printf("\n\t");
244				}
245			}
246			(void)printf("\n\n");
247			exit(0);
248			/* NOTREACHED */
249		}
250		case MTIOCRDHPOS:
251		case MTIOCRDSPOS:
252		{
253			u_int32_t block;
254			if (ioctl(mtfd, comp->c_code, (caddr_t)&block) < 0)
255				err(2, "%s", tape);
256			(void)printf("%s: %s block location %u\n", tape,
257			    (comp->c_code == MTIOCRDHPOS)? "hardware" :
258			    "logical", block);
259			exit(0);
260			/* NOTREACHED */
261		}
262		case MTIOCSLOCATE:
263		case MTIOCHLOCATE:
264		{
265			u_int32_t block = (u_int32_t)mt_com.mt_count;
266			if (ioctl(mtfd, comp->c_code, (caddr_t)&block) < 0)
267				err(2, "%s", tape);
268			exit(0);
269			/* NOTREACHED */
270		}
271		case MTIOCGETEOTMODEL:
272		{
273			u_int32_t om;
274			if (ioctl(mtfd, MTIOCGETEOTMODEL, (caddr_t)&om) < 0)
275				err(2, "%s", tape);
276			(void)printf("%s: the model is %u filemar%s at EOT\n",
277			    tape, om, (om > 1)? "ks" : "k");
278			exit(0);
279			/* NOTREACHED */
280		}
281		case MTIOCSETEOTMODEL:
282		{
283			u_int32_t om, nm = (u_int32_t)mt_com.mt_count;
284			if (ioctl(mtfd, MTIOCGETEOTMODEL, (caddr_t)&om) < 0)
285				err(2, "%s", tape);
286			if (ioctl(mtfd, comp->c_code, (caddr_t)&nm) < 0)
287				err(2, "%s", tape);
288			(void)printf("%s: old model was %u filemar%s at EOT\n",
289			    tape, om, (om > 1)? "ks" : "k");
290			(void)printf("%s: new model  is %u filemar%s at EOT\n",
291			    tape, nm, (nm > 1)? "ks" : "k");
292			exit(0);
293			/* NOTREACHED */
294		}
295		default:
296			break;
297		}
298		if (ioctl(mtfd, MTIOCTOP, &mt_com) < 0)
299			err(1, "%s: %s", tape, comp->c_name);
300	} else {
301		if (ioctl(mtfd, MTIOCGET, &mt_status) < 0)
302			err(1, NULL);
303		status(&mt_status);
304	}
305	exit(0);
306	/* NOTREACHED */
307}
308
309struct tape_desc {
310	short	t_type;		/* type of magtape device */
311	char	*t_name;	/* printing name */
312	char	*t_dsbits;	/* "drive status" register */
313	char	*t_erbits;	/* "error" register */
314} tapes[] = {
315	/*
316	 * XXX This is weird.  The st driver reports the tape drive
317	 * as 0x7 (MT_ISAR - Sun/Archive compatible).
318	 */
319	{ MT_ISAR,	"SCSI tape drive", 0,		0 },
320	{ 0, NULL, 0, 0 }
321};
322
323/*
324 * Interpret the status buffer returned
325 */
326void
327status(bp)
328	register struct mtget *bp;
329{
330	register struct tape_desc *mt;
331
332	for (mt = tapes;; mt++) {
333		if (mt->t_type == 0) {
334			(void)printf("%d: unknown tape drive type\n",
335			    bp->mt_type);
336			return;
337		}
338		if (mt->t_type == bp->mt_type)
339			break;
340	}
341	if(mt->t_type == MT_ISAR)
342		st_status(bp);
343	else {
344		(void)printf("%s tape drive, residual=%d\n",
345		    mt->t_name, bp->mt_resid);
346		printreg("ds", (unsigned short)bp->mt_dsreg, mt->t_dsbits);
347		printreg("\ner", (unsigned short)bp->mt_erreg, mt->t_erbits);
348		(void)putchar('\n');
349	}
350}
351
352/*
353 * Print a register a la the %b format of the kernel's printf.
354 */
355void
356printreg(s, v, bits)
357	const char *s;
358	register u_int v;
359	register char *bits;
360{
361	register int i, any = 0;
362	register char c;
363
364	if (bits && *bits == 8)
365		printf("%s=%o", s, v);
366	else
367		printf("%s=%x", s, v);
368	if (!bits)
369		return;
370	bits++;
371	if (v && bits) {
372		putchar('<');
373		while ((i = *bits++)) {
374			if (v & (1 << (i-1))) {
375				if (any)
376					putchar(',');
377				any = 1;
378				for (; (c = *bits) > 32; bits++)
379					putchar(c);
380			} else
381				for (; *bits > 32; bits++)
382					;
383		}
384		putchar('>');
385	}
386}
387
388void
389usage()
390{
391	(void)fprintf(stderr, "usage: mt [-f device] command [count]\n");
392	exit(1);
393}
394
395struct densities {
396	int dens;
397	int bpmm;
398	int bpi;
399	const char *name;
400} dens[] = {
401	/*
402	 * Taken from T10 Project 997D
403	 * SCSI-3 Stream Device Commands (SSC)
404	 * Revision 11, 4-Nov-97
405	 */
406	/*Num.  bpmm    bpi     Reference     */
407	{ 0x1,	32,	800,	"X3.22-1983" },
408	{ 0x2,	63,	1600,	"X3.39-1986" },
409	{ 0x3,	246,	6250,	"X3.54-1986" },
410	{ 0x5,	315,	8000,	"X3.136-1986" },
411	{ 0x6,	126,	3200,	"X3.157-1987" },
412	{ 0x7,	252,	6400,	"X3.116-1986" },
413	{ 0x8,	315,	8000,	"X3.158-1987" },
414	{ 0x9,	491,	37871,	"X3.180" },
415	{ 0xA,	262,	6667,	"X3B5/86-199" },
416	{ 0xB,	63,	1600,	"X3.56-1986" },
417	{ 0xC,	500,	12690,	"HI-TC1" },
418	{ 0xD,	999,	25380,	"HI-TC2" },
419	{ 0xF,	394,	10000,	"QIC-120" },
420	{ 0x10,	394,	10000,	"QIC-150" },
421	{ 0x11,	630,	16000,	"QIC-320" },
422	{ 0x12,	2034,	51667,	"QIC-1350" },
423	{ 0x13,	2400,	61000,	"X3B5/88-185A" },
424	{ 0x14,	1703,	43245,	"X3.202-1991" },
425	{ 0x15,	1789,	45434,	"ECMA TC17" },
426	{ 0x16,	394,	10000,	"X3.193-1990" },
427	{ 0x17,	1673,	42500,	"X3B5/91-174" },
428	{ 0x18,	1673,	42500,	"X3B5/92-50" },
429	{ 0x19, 2460,   62500,  "DLTapeIII" },
430	{ 0x1A, 3214,   81633,  "DLTapeIV(20GB)" },
431	{ 0x1B, 3383,   85937,  "DLTapeIV(35GB)" },
432	{ 0x1C, 1654,	42000,	"QIC-385M" },
433	{ 0x1D,	1512,	38400,	"QIC-410M" },
434	{ 0x1E, 1385,	36000,	"QIC-1000C" },
435	{ 0x1F,	2666,	67733,	"QIC-2100C" },
436	{ 0x20, 2666,	67733,	"QIC-6GB(M)" },
437	{ 0x21,	2666,	67733,	"QIC-20GB(C)" },
438	{ 0x22,	1600,	40640,	"QIC-2GB(C)" },
439	{ 0x23, 2666,	67733,	"QIC-875M" },
440	{ 0x24,	2400,	61000,	"DDS-2" },
441	{ 0x25,	3816,	97000,	"DDS-3" },
442	{ 0x26,	3816,	97000,	"DDS-4" },
443	{ 0x27,	3056,	77611,	"Mammoth" },
444	{ 0x28,	1491,	37871,	"X3.224" },
445	{ 0x41, 3868,   98250,  "DLTapeIV(40GB)" },
446	{ 0x48, 5236,   133000, "SDLTapeI(110)" },
447	{ 0x49, 7598,   193000, "SDLTapeI(160)" },
448	{ 0, 0, 0, NULL }
449};
450
451struct compression_types {
452	u_int32_t	comp_number;
453	const char 	*name;
454} comp_types[] = {
455	{ 0x00, "none" },
456	{ 0x00, "off" },
457	{ 0x10, "IDRC" },
458	{ 0x20, "DCLZ" },
459	{ 0xffffffff, "enable" },
460	{ 0xffffffff, "on" },
461	{ 0xf0f0f0f0, NULL}
462};
463
464const char *
465denstostring(int d)
466{
467	static char buf[20];
468	struct densities *sd;
469
470	/* densities 0 and 0x7f are handled as special cases */
471	if (d == 0)
472		return "default";
473	if (d == 0x7f)
474		return "same";
475	for (sd = dens; sd->dens; sd++)
476		if (sd->dens == d)
477			break;
478	if (sd->dens == 0)
479		sprintf(buf, "0x%02x", d);
480	else
481		sprintf(buf, "0x%02x:%s", d, sd->name);
482	return buf;
483}
484
485/*
486 * Given a specific density number, return either the bits per inch or bits
487 * per millimeter for the given density.
488 */
489int
490denstobp(int d, int bpi)
491{
492	struct densities *sd;
493
494	for (sd = dens; sd->dens; sd++)
495		if (sd->dens == d)
496			break;
497	if (sd->dens == 0)
498		return(0);
499	else {
500		if (bpi)
501			return(sd->bpi);
502		else
503			return(sd->bpmm);
504	}
505}
506
507int
508stringtodens(const char *s)
509{
510	struct densities *sd;
511	size_t l = strlen(s);
512
513	for (sd = dens; sd->dens; sd++)
514		if (strncasecmp(sd->name, s, l) == 0)
515			break;
516	return sd->dens;
517}
518
519
520const char *
521getblksiz(int bs)
522{
523	static char buf[25];
524	if (bs == 0)
525		return "variable";
526	else {
527		sprintf(buf, "%d bytes", bs);
528		return buf;
529	}
530}
531
532const char *
533comptostring(u_int32_t comp)
534{
535	static char buf[20];
536	struct compression_types *ct;
537
538	if (comp == MT_COMP_DISABLED)
539		return "disabled";
540	else if (comp == MT_COMP_UNSUPP)
541		return "unsupported";
542
543	for (ct = comp_types; ct->name; ct++)
544		if (ct->comp_number == comp)
545			break;
546
547	if (ct->comp_number == 0xf0f0f0f0) {
548		sprintf(buf, "0x%x", comp);
549		return(buf);
550	} else
551		return(ct->name);
552}
553
554u_int32_t
555stringtocomp(const char *s)
556{
557	struct compression_types *ct;
558	size_t l = strlen(s);
559
560	for (ct = comp_types; ct->name; ct++)
561		if (strncasecmp(ct->name, s, l) == 0)
562			break;
563
564	return(ct->comp_number);
565}
566
567void
568st_status(struct mtget *bp)
569{
570	printf("Mode      Density              Blocksize      bpi      "
571	       "Compression\n"
572	       "Current:  %-17s    %-12s   %-7d  %s\n"
573	       "---------available modes---------\n"
574	       "0:        %-17s    %-12s   %-7d  %s\n"
575	       "1:        %-17s    %-12s   %-7d  %s\n"
576	       "2:        %-17s    %-12s   %-7d  %s\n"
577	       "3:        %-17s    %-12s   %-7d  %s\n",
578	       denstostring(bp->mt_density), getblksiz(bp->mt_blksiz),
579	       denstobp(bp->mt_density, TRUE), comptostring(bp->mt_comp),
580	       denstostring(bp->mt_density0), getblksiz(bp->mt_blksiz0),
581	       denstobp(bp->mt_density0, TRUE), comptostring(bp->mt_comp0),
582	       denstostring(bp->mt_density1), getblksiz(bp->mt_blksiz1),
583	       denstobp(bp->mt_density1, TRUE), comptostring(bp->mt_comp1),
584	       denstostring(bp->mt_density2), getblksiz(bp->mt_blksiz2),
585	       denstobp(bp->mt_density2, TRUE), comptostring(bp->mt_comp2),
586	       denstostring(bp->mt_density3), getblksiz(bp->mt_blksiz3),
587	       denstobp(bp->mt_density3, TRUE), comptostring(bp->mt_comp3));
588
589	if (bp->mt_dsreg != MTIO_DSREG_NIL) {
590		auto char foo[32];
591		const char sfmt[] = "Current Driver State: %s.\n";
592		printf("---------------------------------\n");
593		switch (bp->mt_dsreg) {
594		case MTIO_DSREG_REST:
595			printf(sfmt, "at rest");
596			break;
597		case MTIO_DSREG_RBSY:
598			printf(sfmt, "Communicating with drive");
599			break;
600		case MTIO_DSREG_WR:
601			printf(sfmt, "Writing");
602			break;
603		case MTIO_DSREG_FMK:
604			printf(sfmt, "Writing Filemarks");
605			break;
606		case MTIO_DSREG_ZER:
607			printf(sfmt, "Erasing");
608			break;
609		case MTIO_DSREG_RD:
610			printf(sfmt, "Reading");
611			break;
612		case MTIO_DSREG_FWD:
613			printf(sfmt, "Spacing Forward");
614			break;
615		case MTIO_DSREG_REV:
616			printf(sfmt, "Spacing Reverse");
617			break;
618		case MTIO_DSREG_POS:
619			printf(sfmt,
620			    "Hardware Positioning (direction unknown)");
621			break;
622		case MTIO_DSREG_REW:
623			printf(sfmt, "Rewinding");
624			break;
625		case MTIO_DSREG_TEN:
626			printf(sfmt, "Retensioning");
627			break;
628		case MTIO_DSREG_UNL:
629			printf(sfmt, "Unloading");
630			break;
631		case MTIO_DSREG_LD:
632			printf(sfmt, "Loading");
633			break;
634		default:
635			(void) sprintf(foo, "Unknown state 0x%x", bp->mt_dsreg);
636			printf(sfmt, foo);
637			break;
638		}
639	}
640	if (bp->mt_resid == 0 && bp->mt_fileno == (daddr_t) -1 &&
641	    bp->mt_blkno == (daddr_t) -1)
642		return;
643	printf("---------------------------------\n");
644	printf("File Number: %d\tRecord Number: %d\tResidual Count %d\n",
645	    bp->mt_fileno, bp->mt_blkno, bp->mt_resid);
646}
647
648void
649warn_eof(void)
650{
651	fprintf(stderr,
652		"The \"eof\" command has been disabled.\n"
653		"Use \"weof\" if you really want to write end-of-file marks,\n"
654		"or \"eom\" if you rather want to skip to the end of "
655		"recorded medium.\n");
656	exit(1);
657}
658