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("$FreeBSD$"); 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 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 }; 116 117 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 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 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 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 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 * 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 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 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 * 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 * 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 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 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 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