Home | History | Annotate | Line # | Download | only in mt
mt.c revision 1.45 
      1 /* $NetBSD: mt.c,v 1.45 2008/06/27 08:17:43 dogcow Exp $ */
      2 
      3 /*
      4  * Copyright (c) 1980, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #ifndef lint
     34 __COPYRIGHT("@(#) Copyright (c) 1980, 1993\n\
     35 	The Regents of the University of California.  All rights reserved.\n");
     36 #endif /* not lint */
     37 
     38 #ifndef lint
     39 #if 0
     40 static char sccsid[] = "@(#)mt.c	8.2 (Berkeley) 6/6/93";
     41 #else
     42 __RCSID("$NetBSD: mt.c,v 1.45 2008/06/27 08:17:43 dogcow Exp $");
     43 #endif
     44 #endif /* not lint */
     45 
     46 /*
     47  * mt --
     48  *   magnetic tape manipulation program
     49  */
     50 #include <sys/types.h>
     51 #include <sys/param.h>
     52 #include <sys/ioctl.h>
     53 #include <sys/mtio.h>
     54 #include <sys/stat.h>
     55 
     56 #include <ctype.h>
     57 #include <err.h>
     58 #include <fcntl.h>
     59 #include <paths.h>
     60 #include <rmt.h>
     61 #include <stdio.h>
     62 #include <stdlib.h>
     63 #include <string.h>
     64 #include <unistd.h>
     65 
     66 /* pseudo ioctl constants */
     67 #define MTASF	100
     68 
     69 struct commands {
     70 	const char *c_name;		/* command */
     71 	size_t c_namelen;		/* command len */
     72 	u_long c_spcl;			/* ioctl request */
     73 	int c_code;			/* ioctl code for MTIOCTOP command */
     74 	int c_ronly;			/* open tape read-only */
     75 	int c_mincount;			/* min allowed count value */
     76 };
     77 
     78 #define CMD(a)	a, sizeof(a) - 1
     79 const struct commands com[] = {
     80 	{ CMD("asf"),		MTIOCTOP,     MTASF,      1,  0 },
     81 	{ CMD("blocksize"),	MTIOCTOP,     MTSETBSIZ,  1,  0 },
     82 	{ CMD("bsf"),		MTIOCTOP,     MTBSF,      1,  1 },
     83 	{ CMD("bsr"),		MTIOCTOP,     MTBSR,      1,  1 },
     84 	{ CMD("compress"),	MTIOCTOP,     MTCMPRESS,  1,  0 },
     85 	{ CMD("density"),	MTIOCTOP,     MTSETDNSTY, 1,  0 },
     86 	{ CMD("eof"),		MTIOCTOP,     MTWEOF,     0,  1 },
     87 	{ CMD("eom"),		MTIOCTOP,     MTEOM,      1,  0 },
     88 	{ CMD("erase"),		MTIOCTOP,     MTERASE,    0,  0 },
     89 	{ CMD("fsf"),		MTIOCTOP,     MTFSF,      1,  1 },
     90 	{ CMD("fsr"),		MTIOCTOP,     MTFSR,      1,  1 },
     91 	{ CMD("offline"),	MTIOCTOP,     MTOFFL,     1,  0 },
     92 	{ CMD("rdhpos"),	MTIOCRDHPOS,  0,          1,  0 },
     93 	{ CMD("rdspos"),	MTIOCRDSPOS,  0,          1,  0 },
     94 	{ CMD("retension"),	MTIOCTOP,     MTRETEN,    1,  0 },
     95 	{ CMD("rewind"),	MTIOCTOP,     MTREW,      1,  0 },
     96 	{ CMD("rewoffl"),	MTIOCTOP,     MTOFFL,     1,  0 },
     97 	{ CMD("setblk"),	MTIOCTOP,     MTSETBSIZ,  1,  0 },
     98 	{ CMD("setdensity"),	MTIOCTOP,     MTSETDNSTY, 1,  0 },
     99 	{ CMD("sethpos"),	MTIOCHLOCATE, 0,          1,  0 },
    100 	{ CMD("setspos"),	MTIOCSLOCATE, 0,          1,  0 },
    101 	{ CMD("status"),	MTIOCGET,     MTNOP,      1,  0 },
    102 	{ CMD("weof"),		MTIOCTOP,     MTWEOF,     0,  1 },
    103 	{ CMD("eew"),		MTIOCTOP,     MTEWARN,    1,  0 },
    104 	{ .c_name = NULL }
    105 };
    106 
    107 void printreg(const char *, u_int, const char *);
    108 void status(struct mtget *);
    109 void usage(void);
    110 int main(int, char *[]);
    111 
    112 int
    113 main(int argc, char *argv[])
    114 {
    115 	const struct commands *cp, *comp;
    116 	struct mtget mt_status;
    117 	struct mtop mt_com;
    118 	int ch, mtfd, flags;
    119 	char *p;
    120 	const char *tape;
    121 	int count;
    122 	size_t len;
    123 
    124 	setprogname(argv[0]);
    125 	if ((tape = getenv("TAPE")) == NULL)
    126 		tape = _PATH_DEFTAPE;
    127 
    128 	while ((ch = getopt(argc, argv, "f:t:")) != -1)
    129 		switch (ch) {
    130 		case 'f':
    131 		case 't':
    132 			tape = optarg;
    133 			break;
    134 		case '?':
    135 		default:
    136 			usage();
    137 		}
    138 	argc -= optind;
    139 	argv += optind;
    140 
    141 	if (argc < 1 || argc > 2)
    142 		usage();
    143 
    144 	len = strlen(p = *argv++);
    145 	for (comp = NULL, cp = com; cp->c_name != NULL; cp++) {
    146 		size_t clen = MIN(len, cp->c_namelen);
    147 		if (strncmp(p, cp->c_name, clen) == 0) {
    148 			if (comp != NULL)
    149 				errx(1, "%s: Ambiguous command `%s' or `%s'?",
    150 				    p, cp->c_name, comp->c_name);
    151 			else
    152 				comp = cp;
    153 		}
    154 	}
    155 	if (comp == NULL)
    156 		errx(1, "%s: unknown command", p);
    157 
    158 	if (*argv) {
    159 		count = strtol(*argv, &p, 10);
    160 		if (count < comp->c_mincount || *p)
    161 			errx(2, "%s: illegal count", *argv);
    162 	} else
    163 		count = 1;
    164 
    165 	flags = comp->c_ronly ? O_RDONLY : O_WRONLY;
    166 
    167 	if ((mtfd = open(tape, flags)) < 0)
    168 		err(2, "%s", tape);
    169 
    170 	switch (comp->c_spcl) {
    171 	case MTIOCTOP:
    172 		if (comp->c_code == MTASF) {
    173 
    174 			/* If mtget.mt_fileno was implemented, We could
    175 			   compute the minimal seek needed to position
    176 			   the tape.  Until then, rewind and seek from
    177 			   begining-of-tape */
    178 
    179 			mt_com.mt_op = MTREW;
    180 			mt_com.mt_count = 1;
    181 			if (ioctl(mtfd, MTIOCTOP, &mt_com) < 0)
    182 				err(2, "%s", tape);
    183 
    184 			if (count > 0) {
    185 				mt_com.mt_op = MTFSF;
    186 				    mt_com.mt_count = count;
    187 				if (ioctl(mtfd, MTIOCTOP, &mt_com) < 0)
    188 				    err(2, "%s", tape);
    189 			}
    190 
    191 		} else {
    192 			mt_com.mt_op = comp->c_code;
    193 			mt_com.mt_count = count;
    194 
    195 			if (ioctl(mtfd, MTIOCTOP, &mt_com) < 0)
    196 				err(2, "%s: %s", tape, comp->c_name);
    197 
    198 		}
    199 		break;
    200 
    201 	case MTIOCGET:
    202 		if (ioctl(mtfd, MTIOCGET, &mt_status) < 0)
    203 			err(2, "%s: %s", tape, comp->c_name);
    204 		status(&mt_status);
    205 		break;
    206 
    207 	case MTIOCRDSPOS:
    208 	case MTIOCRDHPOS:
    209 		if (ioctl(mtfd, comp->c_spcl, (caddr_t) &count) < 0)
    210 			err(2, "%s", tape);
    211 		printf("%s: block location %u\n", tape, (unsigned int) count);
    212 		break;
    213 
    214 	case MTIOCSLOCATE:
    215 	case MTIOCHLOCATE:
    216 		if (ioctl(mtfd, comp->c_spcl, (caddr_t) &count) < 0)
    217 			err(2, "%s", tape);
    218 		break;
    219 
    220 	default:
    221 		errx(1, "internal error: unknown request %ld", comp->c_spcl);
    222 	}
    223 
    224 	exit(0);
    225 	/* NOTREACHED */
    226 }
    227 
    228 #if defined(sun) && !defined(__SVR4)
    229 #include <sundev/tmreg.h>
    230 #include <sundev/arreg.h>
    231 #endif
    232 
    233 #ifdef tahoe
    234 #include <tahoe/vba/cyreg.h>
    235 #endif
    236 
    237 const struct tape_desc {
    238 	short	t_type;		/* type of magtape device */
    239 	const	char *t_name;	/* printing name */
    240 	const	char *t_dsbits;	/* "drive status" register */
    241 	const	char *t_erbits;	/* "error" register */
    242 } tapes[] = {
    243 #if defined(sun) && !defined(__SVR4)
    244 	{ MT_ISCPC,	"TapeMaster",	TMS_BITS,	0 },
    245 	{ MT_ISAR,	"Archive",	ARCH_CTRL_BITS,	ARCH_BITS },
    246 #endif
    247 #ifdef tahoe
    248 	{ MT_ISCY,	"cipher",	CYS_BITS,	CYCW_BITS },
    249 #endif
    250 #define SCSI_DS_BITS	"\20\5WriteProtect\2Mounted"
    251 	{ 0x7,		"SCSI",		SCSI_DS_BITS,	"76543210" },
    252 	{ .t_type = 0 }
    253 };
    254 
    255 
    256 /*
    257  * Interpret the status buffer returned
    258  */
    259 void
    260 status(struct mtget *bp)
    261 {
    262 	const struct tape_desc *mt;
    263 
    264 	for (mt = tapes;; mt++) {
    265 		if (mt->t_type == 0) {
    266 			(void)printf("%d: unknown tape drive type\n",
    267 			    bp->mt_type);
    268 			return;
    269 		}
    270 		if (mt->t_type == bp->mt_type)
    271 			break;
    272 	}
    273 	(void)printf("%s tape drive, residual=%d\n", mt->t_name, bp->mt_resid);
    274 	printreg("ds", bp->mt_dsreg, mt->t_dsbits);
    275 	printreg("\ner", bp->mt_erreg, mt->t_erbits);
    276 	(void)putchar('\n');
    277 	(void)printf("blocksize: %d (%d, %d, %d, %d)\n",
    278 		bp->mt_blksiz, bp->mt_mblksiz[0], bp->mt_mblksiz[1],
    279 		bp->mt_mblksiz[2], bp->mt_mblksiz[3]);
    280 	(void)printf("density: %d (%d, %d, %d, %d)\n",
    281 		bp->mt_density, bp->mt_mdensity[0], bp->mt_mdensity[1],
    282 		bp->mt_mdensity[2], bp->mt_mdensity[3]);
    283 	(void)printf("current file number: %d\n", bp->mt_fileno);
    284 	(void)printf("current block number: %d\n", bp->mt_blkno);
    285 }
    286 
    287 /*
    288  * Print a register a la the %b format of the kernel's printf.
    289  */
    290 void
    291 printreg(const char *s, u_int v, const char *bits)
    292 {
    293 	int any, i;
    294 	char c;
    295 
    296 	any = 0;
    297 	if (bits && *bits == 8)
    298 		printf("%s=%o", s, v);
    299 	else
    300 		printf("%s=%x", s, v);
    301 	if (v && bits && *++bits) {
    302 		putchar('<');
    303 		while ((i = *bits++)) {
    304 			if (v & (1 << (i-1))) {
    305 				if (any)
    306 					putchar(',');
    307 				any = 1;
    308 				for (; (c = *bits) > 32; bits++)
    309 					putchar(c);
    310 			} else
    311 				for (; *bits > 32; bits++)
    312 					;
    313 		}
    314 		putchar('>');
    315 	}
    316 }
    317 
    318 void
    319 usage(void)
    320 {
    321 	(void)fprintf(stderr, "usage: %s [-f device] command [count]\n",
    322 	    getprogname());
    323 	exit(1);
    324 	/* NOTREACHED */
    325 }
    326