mt.c revision 225736 
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#ifndef lint
31static const char copyright[] =
32"@(#) Copyright (c) 1980, 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
38static char sccsid[] = "@(#)mt.c	8.2 (Berkeley) 5/4/95";
39#endif
40#endif /* not lint */
41
42#include <sys/cdefs.h>
43__FBSDID("$FreeBSD: stable/9/usr.bin/mt/mt.c 216370 2010-12-11 08:32:16Z joel $");
44
45/*
46 * mt --
47 *   magnetic tape manipulation program
48 */
49#include <sys/types.h>
50#include <sys/ioctl.h>
51#include <sys/mtio.h>
52
53#include <ctype.h>
54#include <err.h>
55#include <fcntl.h>
56#include <stdio.h>
57#include <stdlib.h>
58#include <string.h>
59#include <unistd.h>
60
61/* the appropriate sections of <sys/mtio.h> are also #ifdef'd for FreeBSD */
62/* c_flags */
63#define NEED_2ARGS	0x01
64#define ZERO_ALLOWED	0x02
65#define IS_DENSITY	0x04
66#define DISABLE_THIS	0x08
67#define IS_COMP		0x10
68
69#ifndef TRUE
70#define TRUE 1
71#endif
72#ifndef FALSE
73#define FALSE 0
74#endif
75
76struct commands {
77	const char *c_name;
78	int c_code;
79	int c_ronly;
80	int c_flags;
81} com[] = {
82	{ "bsf",	MTBSF,	1, 0 },
83	{ "bsr",	MTBSR,	1, 0 },
84	/* XXX FreeBSD considered "eof" dangerous, since it's being
85	   confused with "eom" (and is an alias for "weof" anyway) */
86	{ "eof",	MTWEOF, 0, DISABLE_THIS },
87	{ "fsf",	MTFSF,	1, 0 },
88	{ "fsr",	MTFSR,	1, 0 },
89	{ "offline",	MTOFFL,	1, 0 },
90	{ "rewind",	MTREW,	1, 0 },
91	{ "rewoffl",	MTOFFL,	1, 0 },
92	{ "status",	MTNOP,	1, 0 },
93	{ "weof",	MTWEOF,	0, ZERO_ALLOWED },
94	{ "erase",	MTERASE, 0, ZERO_ALLOWED},
95	{ "blocksize",	MTSETBSIZ, 0, NEED_2ARGS|ZERO_ALLOWED },
96	{ "density",	MTSETDNSTY, 0, NEED_2ARGS|ZERO_ALLOWED|IS_DENSITY },
97	{ "eom",	MTEOD, 1, 0 },
98	{ "eod",	MTEOD, 1, 0 },
99	{ "smk",	MTWSS, 0, 0 },
100	{ "wss",	MTWSS, 0, 0 },
101	{ "fss",	MTFSS, 1, 0 },
102	{ "bss",	MTBSS, 1, 0 },
103	{ "comp",	MTCOMP, 0, NEED_2ARGS|ZERO_ALLOWED|IS_COMP },
104	{ "retension",	MTRETENS, 1, 0 },
105	{ "rdhpos",     MTIOCRDHPOS,  0, 0 },
106	{ "rdspos",     MTIOCRDSPOS,  0, 0 },
107	{ "sethpos",    MTIOCHLOCATE, 0, NEED_2ARGS|ZERO_ALLOWED },
108	{ "setspos",    MTIOCSLOCATE, 0, NEED_2ARGS|ZERO_ALLOWED },
109	{ "errstat",	MTIOCERRSTAT, 0, 0 },
110	{ "setmodel",	MTIOCSETEOTMODEL, 0, NEED_2ARGS|ZERO_ALLOWED },
111	{ "seteotmodel",	MTIOCSETEOTMODEL, 0, NEED_2ARGS|ZERO_ALLOWED },
112	{ "getmodel",	MTIOCGETEOTMODEL, 0, 0 },
113	{ "geteotmodel",	MTIOCGETEOTMODEL, 0, 0 },
114	{ NULL, 0, 0, 0 }
115};
116
117const char *getblksiz(int);
118void printreg(const char *, u_int, const char *);
119void status(struct mtget *);
120void usage(void);
121void st_status (struct mtget *);
122int stringtodens (const char *s);
123const char *denstostring (int d);
124int denstobp(int d, int bpi);
125u_int32_t stringtocomp(const char *s);
126const char *comptostring(u_int32_t comp);
127void warn_eof(void);
128
129int
130main(int argc, char *argv[])
131{
132	struct commands *comp;
133	struct mtget mt_status;
134	struct mtop mt_com;
135	int ch, len, mtfd;
136	const char *p, *tape;
137
138	if ((tape = getenv("TAPE")) == NULL)
139		tape = DEFTAPE;
140
141	while ((ch = getopt(argc, argv, "f:t:")) != -1)
142		switch(ch) {
143		case 'f':
144		case 't':
145			tape = optarg;
146			break;
147		case '?':
148		default:
149			usage();
150		}
151	argc -= optind;
152	argv += optind;
153
154	if (argc < 1 || argc > 2)
155		usage();
156
157	len = strlen(p = *argv++);
158	for (comp = com;; comp++) {
159		if (comp->c_name == NULL)
160			errx(1, "%s: unknown command", p);
161		if (strncmp(p, comp->c_name, len) == 0)
162			break;
163	}
164	if((comp->c_flags & NEED_2ARGS) && argc != 2)
165		usage();
166	if(comp->c_flags & DISABLE_THIS) {
167		warn_eof();
168	}
169	if ((mtfd = open(tape, comp->c_ronly ? O_RDONLY : O_RDWR)) < 0)
170		err(1, "%s", tape);
171	if (comp->c_code != MTNOP) {
172		mt_com.mt_op = comp->c_code;
173		if (*argv) {
174			if (!isdigit(**argv) &&
175			    (comp->c_flags & IS_DENSITY)) {
176				const char *dcanon;
177				mt_com.mt_count = stringtodens(*argv);
178				if (mt_com.mt_count == 0)
179					errx(1, "%s: unknown density", *argv);
180				dcanon = denstostring(mt_com.mt_count);
181				if (strcmp(dcanon, *argv) != 0)
182					printf(
183					"Using \"%s\" as an alias for %s\n",
184					       *argv, dcanon);
185				p = "";
186			} else if (!isdigit(**argv) &&
187				   (comp->c_flags & IS_COMP)) {
188
189				mt_com.mt_count = stringtocomp(*argv);
190				if ((u_int32_t)mt_com.mt_count == 0xf0f0f0f0)
191					errx(1, "%s: unknown compression",
192					     *argv);
193				p = "";
194			} else {
195				char *q;
196				/* allow for hex numbers; useful for density */
197				mt_com.mt_count = strtol(*argv, &q, 0);
198				p = q;
199			}
200			if ((mt_com.mt_count <=
201			    ((comp->c_flags & ZERO_ALLOWED)? -1: 0)
202			    && ((comp->c_flags & IS_COMP) == 0)
203			    ) || *p)
204				errx(1, "%s: illegal count", *argv);
205		}
206		else
207			mt_com.mt_count = 1;
208		switch (comp->c_code) {
209		case MTIOCERRSTAT:
210		{
211			unsigned int i;
212			union mterrstat umn;
213			struct scsi_tape_errors *s = &umn.scsi_errstat;
214
215			if (ioctl(mtfd, comp->c_code, (caddr_t)&umn) < 0)
216				err(2, "%s", tape);
217			(void)printf("Last I/O Residual: %u\n", s->io_resid);
218			(void)printf(" Last I/O Command:");
219			for (i = 0; i < sizeof (s->io_cdb); i++)
220				(void)printf(" %02X", s->io_cdb[i]);
221			(void)printf("\n");
222			(void)printf("   Last I/O Sense:\n\n\t");
223			for (i = 0; i < sizeof (s->io_sense); i++) {
224				(void)printf(" %02X", s->io_sense[i]);
225				if (((i + 1) & 0xf) == 0) {
226					(void)printf("\n\t");
227				}
228			}
229			(void)printf("\n");
230			(void)printf("Last Control Residual: %u\n",
231			    s->ctl_resid);
232			(void)printf(" Last Control Command:");
233			for (i = 0; i < sizeof (s->ctl_cdb); i++)
234				(void)printf(" %02X", s->ctl_cdb[i]);
235			(void)printf("\n");
236			(void)printf("   Last Control Sense:\n\n\t");
237			for (i = 0; i < sizeof (s->ctl_sense); i++) {
238				(void)printf(" %02X", s->ctl_sense[i]);
239				if (((i + 1) & 0xf) == 0) {
240					(void)printf("\n\t");
241				}
242			}
243			(void)printf("\n\n");
244			exit(0);
245			/* NOTREACHED */
246		}
247		case MTIOCRDHPOS:
248		case MTIOCRDSPOS:
249		{
250			u_int32_t block;
251			if (ioctl(mtfd, comp->c_code, (caddr_t)&block) < 0)
252				err(2, "%s", tape);
253			(void)printf("%s: %s block location %u\n", tape,
254			    (comp->c_code == MTIOCRDHPOS)? "hardware" :
255			    "logical", block);
256			exit(0);
257			/* NOTREACHED */
258		}
259		case MTIOCSLOCATE:
260		case MTIOCHLOCATE:
261		{
262			u_int32_t block = (u_int32_t)mt_com.mt_count;
263			if (ioctl(mtfd, comp->c_code, (caddr_t)&block) < 0)
264				err(2, "%s", tape);
265			exit(0);
266			/* NOTREACHED */
267		}
268		case MTIOCGETEOTMODEL:
269		{
270			u_int32_t om;
271			if (ioctl(mtfd, MTIOCGETEOTMODEL, (caddr_t)&om) < 0)
272				err(2, "%s", tape);
273			(void)printf("%s: the model is %u filemar%s at EOT\n",
274			    tape, om, (om > 1)? "ks" : "k");
275			exit(0);
276			/* NOTREACHED */
277		}
278		case MTIOCSETEOTMODEL:
279		{
280			u_int32_t om, nm = (u_int32_t)mt_com.mt_count;
281			if (ioctl(mtfd, MTIOCGETEOTMODEL, (caddr_t)&om) < 0)
282				err(2, "%s", tape);
283			if (ioctl(mtfd, comp->c_code, (caddr_t)&nm) < 0)
284				err(2, "%s", tape);
285			(void)printf("%s: old model was %u filemar%s at EOT\n",
286			    tape, om, (om > 1)? "ks" : "k");
287			(void)printf("%s: new model  is %u filemar%s at EOT\n",
288			    tape, nm, (nm > 1)? "ks" : "k");
289			exit(0);
290			/* NOTREACHED */
291		}
292		default:
293			break;
294		}
295		if (ioctl(mtfd, MTIOCTOP, &mt_com) < 0)
296			err(1, "%s: %s", tape, comp->c_name);
297	} else {
298		if (ioctl(mtfd, MTIOCGET, &mt_status) < 0)
299			err(1, NULL);
300		status(&mt_status);
301	}
302	exit(0);
303	/* NOTREACHED */
304}
305
306struct tape_desc {
307	short	t_type;		/* type of magtape device */
308	const char *t_name;	/* printing name */
309	const char *t_dsbits;	/* "drive status" register */
310	const char *t_erbits;	/* "error" register */
311} tapes[] = {
312	{ MT_ISAR,	"SCSI tape drive", 0,		0 },
313	{ 0, NULL, 0, 0 }
314};
315
316/*
317 * Interpret the status buffer returned
318 */
319void
320status(struct mtget *bp)
321{
322	struct tape_desc *mt;
323
324	for (mt = tapes;; mt++) {
325		if (mt->t_type == 0) {
326			(void)printf("%d: unknown tape drive type\n",
327			    bp->mt_type);
328			return;
329		}
330		if (mt->t_type == bp->mt_type)
331			break;
332	}
333	if(mt->t_type == MT_ISAR)
334		st_status(bp);
335	else {
336		(void)printf("%s tape drive, residual=%d\n",
337		    mt->t_name, bp->mt_resid);
338		printreg("ds", (unsigned short)bp->mt_dsreg, mt->t_dsbits);
339		printreg("\ner", (unsigned short)bp->mt_erreg, mt->t_erbits);
340		(void)putchar('\n');
341	}
342}
343
344/*
345 * Print a register a la the %b format of the kernel's printf.
346 */
347void
348printreg(const char *s, u_int v, const char *bits)
349{
350	int i, any = 0;
351	char c;
352
353	if (bits && *bits == 8)
354		printf("%s=%o", s, v);
355	else
356		printf("%s=%x", s, v);
357	if (!bits)
358		return;
359	bits++;
360	if (v && bits) {
361		putchar('<');
362		while ((i = *bits++)) {
363			if (v & (1 << (i-1))) {
364				if (any)
365					putchar(',');
366				any = 1;
367				for (; (c = *bits) > 32; bits++)
368					putchar(c);
369			} else
370				for (; *bits > 32; bits++)
371					;
372		}
373		putchar('>');
374	}
375}
376
377void
378usage(void)
379{
380	(void)fprintf(stderr, "usage: mt [-f device] command [count]\n");
381	exit(1);
382}
383
384struct densities {
385	int dens;
386	int bpmm;
387	int bpi;
388	const char *name;
389} dens[] = {
390	/*
391	 * Taken from T10 Project 997D
392	 * SCSI-3 Stream Device Commands (SSC)
393	 * Revision 11, 4-Nov-97
394	 */
395	/*Num.  bpmm    bpi     Reference     */
396	{ 0x1,	32,	800,	"X3.22-1983" },
397	{ 0x2,	63,	1600,	"X3.39-1986" },
398	{ 0x3,	246,	6250,	"X3.54-1986" },
399	{ 0x5,	315,	8000,	"X3.136-1986" },
400	{ 0x6,	126,	3200,	"X3.157-1987" },
401	{ 0x7,	252,	6400,	"X3.116-1986" },
402	{ 0x8,	315,	8000,	"X3.158-1987" },
403	{ 0x9,	491,	37871,	"X3.180" },
404	{ 0xA,	262,	6667,	"X3B5/86-199" },
405	{ 0xB,	63,	1600,	"X3.56-1986" },
406	{ 0xC,	500,	12690,	"HI-TC1" },
407	{ 0xD,	999,	25380,	"HI-TC2" },
408	{ 0xF,	394,	10000,	"QIC-120" },
409	{ 0x10,	394,	10000,	"QIC-150" },
410	{ 0x11,	630,	16000,	"QIC-320" },
411	{ 0x12,	2034,	51667,	"QIC-1350" },
412	{ 0x13,	2400,	61000,	"X3B5/88-185A" },
413	{ 0x14,	1703,	43245,	"X3.202-1991" },
414	{ 0x15,	1789,	45434,	"ECMA TC17" },
415	{ 0x16,	394,	10000,	"X3.193-1990" },
416	{ 0x17,	1673,	42500,	"X3B5/91-174" },
417	{ 0x18,	1673,	42500,	"X3B5/92-50" },
418	{ 0x19, 2460,   62500,  "DLTapeIII" },
419	{ 0x1A, 3214,   81633,  "DLTapeIV(20GB)" },
420	{ 0x1B, 3383,   85937,  "DLTapeIV(35GB)" },
421	{ 0x1C, 1654,	42000,	"QIC-385M" },
422	{ 0x1D,	1512,	38400,	"QIC-410M" },
423	{ 0x1E, 1385,	36000,	"QIC-1000C" },
424	{ 0x1F,	2666,	67733,	"QIC-2100C" },
425	{ 0x20, 2666,	67733,	"QIC-6GB(M)" },
426	{ 0x21,	2666,	67733,	"QIC-20GB(C)" },
427	{ 0x22,	1600,	40640,	"QIC-2GB(C)" },
428	{ 0x23, 2666,	67733,	"QIC-875M" },
429	{ 0x24,	2400,	61000,	"DDS-2" },
430	{ 0x25,	3816,	97000,	"DDS-3" },
431	{ 0x26,	3816,	97000,	"DDS-4" },
432	{ 0x27,	3056,	77611,	"Mammoth" },
433	{ 0x28,	1491,	37871,	"X3.224" },
434	{ 0x41, 3868,   98250,  "DLTapeIV(40GB)" },
435	{ 0x48, 5236,   133000, "SDLTapeI(110)" },
436	{ 0x49, 7598,   193000, "SDLTapeI(160)" },
437	{ 0, 0, 0, NULL }
438};
439
440struct compression_types {
441	u_int32_t	comp_number;
442	const char 	*name;
443} comp_types[] = {
444	{ 0x00, "none" },
445	{ 0x00, "off" },
446	{ 0x10, "IDRC" },
447	{ 0x20, "DCLZ" },
448	{ 0xffffffff, "enable" },
449	{ 0xffffffff, "on" },
450	{ 0xf0f0f0f0, NULL}
451};
452
453const char *
454denstostring(int d)
455{
456	static char buf[20];
457	struct densities *sd;
458
459	/* densities 0 and 0x7f are handled as special cases */
460	if (d == 0)
461		return "default";
462	if (d == 0x7f)
463		return "same";
464	for (sd = dens; sd->dens; sd++)
465		if (sd->dens == d)
466			break;
467	if (sd->dens == 0)
468		sprintf(buf, "0x%02x", d);
469	else
470		sprintf(buf, "0x%02x:%s", d, sd->name);
471	return buf;
472}
473
474/*
475 * Given a specific density number, return either the bits per inch or bits
476 * per millimeter for the given density.
477 */
478int
479denstobp(int d, int bpi)
480{
481	struct densities *sd;
482
483	for (sd = dens; sd->dens; sd++)
484		if (sd->dens == d)
485			break;
486	if (sd->dens == 0)
487		return(0);
488	else {
489		if (bpi)
490			return(sd->bpi);
491		else
492			return(sd->bpmm);
493	}
494}
495
496int
497stringtodens(const char *s)
498{
499	struct densities *sd;
500	size_t l = strlen(s);
501
502	for (sd = dens; sd->dens; sd++)
503		if (strncasecmp(sd->name, s, l) == 0)
504			break;
505	return sd->dens;
506}
507
508
509const char *
510getblksiz(int bs)
511{
512	static char buf[25];
513	if (bs == 0)
514		return "variable";
515	else {
516		sprintf(buf, "%d bytes", bs);
517		return buf;
518	}
519}
520
521const char *
522comptostring(u_int32_t comp)
523{
524	static char buf[20];
525	struct compression_types *ct;
526
527	if (comp == MT_COMP_DISABLED)
528		return "disabled";
529	else if (comp == MT_COMP_UNSUPP)
530		return "unsupported";
531
532	for (ct = comp_types; ct->name; ct++)
533		if (ct->comp_number == comp)
534			break;
535
536	if (ct->comp_number == 0xf0f0f0f0) {
537		sprintf(buf, "0x%x", comp);
538		return(buf);
539	} else
540		return(ct->name);
541}
542
543u_int32_t
544stringtocomp(const char *s)
545{
546	struct compression_types *ct;
547	size_t l = strlen(s);
548
549	for (ct = comp_types; ct->name; ct++)
550		if (strncasecmp(ct->name, s, l) == 0)
551			break;
552
553	return(ct->comp_number);
554}
555
556void
557st_status(struct mtget *bp)
558{
559	printf("Mode      Density              Blocksize      bpi      "
560	       "Compression\n"
561	       "Current:  %-17s    %-12s   %-7d  %s\n"
562	       "---------available modes---------\n"
563	       "0:        %-17s    %-12s   %-7d  %s\n"
564	       "1:        %-17s    %-12s   %-7d  %s\n"
565	       "2:        %-17s    %-12s   %-7d  %s\n"
566	       "3:        %-17s    %-12s   %-7d  %s\n",
567	       denstostring(bp->mt_density), getblksiz(bp->mt_blksiz),
568	       denstobp(bp->mt_density, TRUE), comptostring(bp->mt_comp),
569	       denstostring(bp->mt_density0), getblksiz(bp->mt_blksiz0),
570	       denstobp(bp->mt_density0, TRUE), comptostring(bp->mt_comp0),
571	       denstostring(bp->mt_density1), getblksiz(bp->mt_blksiz1),
572	       denstobp(bp->mt_density1, TRUE), comptostring(bp->mt_comp1),
573	       denstostring(bp->mt_density2), getblksiz(bp->mt_blksiz2),
574	       denstobp(bp->mt_density2, TRUE), comptostring(bp->mt_comp2),
575	       denstostring(bp->mt_density3), getblksiz(bp->mt_blksiz3),
576	       denstobp(bp->mt_density3, TRUE), comptostring(bp->mt_comp3));
577
578	if (bp->mt_dsreg != MTIO_DSREG_NIL) {
579		auto char foo[32];
580		const char sfmt[] = "Current Driver State: %s.\n";
581		printf("---------------------------------\n");
582		switch (bp->mt_dsreg) {
583		case MTIO_DSREG_REST:
584			printf(sfmt, "at rest");
585			break;
586		case MTIO_DSREG_RBSY:
587			printf(sfmt, "Communicating with drive");
588			break;
589		case MTIO_DSREG_WR:
590			printf(sfmt, "Writing");
591			break;
592		case MTIO_DSREG_FMK:
593			printf(sfmt, "Writing Filemarks");
594			break;
595		case MTIO_DSREG_ZER:
596			printf(sfmt, "Erasing");
597			break;
598		case MTIO_DSREG_RD:
599			printf(sfmt, "Reading");
600			break;
601		case MTIO_DSREG_FWD:
602			printf(sfmt, "Spacing Forward");
603			break;
604		case MTIO_DSREG_REV:
605			printf(sfmt, "Spacing Reverse");
606			break;
607		case MTIO_DSREG_POS:
608			printf(sfmt,
609			    "Hardware Positioning (direction unknown)");
610			break;
611		case MTIO_DSREG_REW:
612			printf(sfmt, "Rewinding");
613			break;
614		case MTIO_DSREG_TEN:
615			printf(sfmt, "Retensioning");
616			break;
617		case MTIO_DSREG_UNL:
618			printf(sfmt, "Unloading");
619			break;
620		case MTIO_DSREG_LD:
621			printf(sfmt, "Loading");
622			break;
623		default:
624			(void) sprintf(foo, "Unknown state 0x%x", bp->mt_dsreg);
625			printf(sfmt, foo);
626			break;
627		}
628	}
629	if (bp->mt_resid == 0 && bp->mt_fileno == (daddr_t) -1 &&
630	    bp->mt_blkno == (daddr_t) -1)
631		return;
632	printf("---------------------------------\n");
633	printf("File Number: %d\tRecord Number: %d\tResidual Count %d\n",
634	    bp->mt_fileno, bp->mt_blkno, bp->mt_resid);
635}
636
637void
638warn_eof(void)
639{
640	fprintf(stderr,
641		"The \"eof\" command has been disabled.\n"
642		"Use \"weof\" if you really want to write end-of-file marks,\n"
643		"or \"eom\" if you rather want to skip to the end of "
644		"recorded medium.\n");
645	exit(1);
646}
647