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
31 static 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
38 static 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 229181 2012-01-01 18:25:16Z dim $");
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
76 struct commands {
77 const char *c_name;
78 unsigned long 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
117 const char *getblksiz(int);
118 void printreg(const char *, u_int, const char *);
119 void status(struct mtget *);
120 void usage(void);
121 void st_status (struct mtget *);
122 int stringtodens (const char *s);
123 const char *denstostring (int d);
124 int denstobp(int d, int bpi);
125 u_int32_t stringtocomp(const char *s);
126 const char *comptostring(u_int32_t comp);
127 void warn_eof(void);
128
129 int
main(int argc,char * argv[])130 main(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
306 struct 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 */
319 void
status(struct mtget * bp)320 status(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 */
347 void
printreg(const char * s,u_int v,const char * bits)348 printreg(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
377 void
usage(void)378 usage(void)
379 {
380 (void)fprintf(stderr, "usage: mt [-f device] command [count]\n");
381 exit(1);
382 }
383
384 struct 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
440 struct 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
453 const char *
denstostring(int d)454 denstostring(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 */
478 int
denstobp(int d,int bpi)479 denstobp(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
496 int
stringtodens(const char * s)497 stringtodens(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
509 const char *
getblksiz(int bs)510 getblksiz(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
521 const char *
comptostring(u_int32_t comp)522 comptostring(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
543 u_int32_t
stringtocomp(const char * s)544 stringtocomp(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
556 void
st_status(struct mtget * bp)557 st_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
637 void
warn_eof(void)638 warn_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