1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
|
/* vi: set sw=4 ts=4: */
/*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
//usage:#define mt_trivial_usage
//usage: "[-f device] opcode value"
//usage:#define mt_full_usage "\n\n"
//usage: "Control magnetic tape drive operation\n"
//usage: "\n"
//usage: "Available Opcodes:\n"
//usage: "\n"
//usage: "bsf bsfm bsr bss datacompression drvbuffer eof eom erase\n"
//usage: "fsf fsfm fsr fss load lock mkpart nop offline ras1 ras2\n"
//usage: "ras3 reset retension rewind rewoffline seek setblk setdensity\n"
//usage: "setpart tell unload unlock weof wset"
#include "libbb.h"
#include <sys/mtio.h>
/* missing: eod/seod, stoptions, stwrthreshold, densities */
static const short opcode_value[] = {
MTBSF,
MTBSFM,
MTBSR,
MTBSS,
MTCOMPRESSION,
MTEOM,
MTERASE,
MTFSF,
MTFSFM,
MTFSR,
MTFSS,
MTLOAD,
MTLOCK,
MTMKPART,
MTNOP,
MTOFFL,
MTOFFL,
MTRAS1,
MTRAS2,
MTRAS3,
MTRESET,
MTRETEN,
MTREW,
MTSEEK,
MTSETBLK,
MTSETDENSITY,
MTSETDRVBUFFER,
MTSETPART,
MTTELL,
MTWSM,
MTUNLOAD,
MTUNLOCK,
MTWEOF,
MTWEOF
};
static const char opcode_name[] ALIGN1 =
"bsf" "\0"
"bsfm" "\0"
"bsr" "\0"
"bss" "\0"
"datacompression" "\0"
"eom" "\0"
"erase" "\0"
"fsf" "\0"
"fsfm" "\0"
"fsr" "\0"
"fss" "\0"
"load" "\0"
"lock" "\0"
"mkpart" "\0"
"nop" "\0"
"offline" "\0"
"rewoffline" "\0"
"ras1" "\0"
"ras2" "\0"
"ras3" "\0"
"reset" "\0"
"retension" "\0"
"rewind" "\0"
"seek" "\0"
"setblk" "\0"
"setdensity" "\0"
"drvbuffer" "\0"
"setpart" "\0"
"tell" "\0"
"wset" "\0"
"unload" "\0"
"unlock" "\0"
"eof" "\0"
"weof" "\0";
int mt_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int mt_main(int argc UNUSED_PARAM, char **argv)
{
const char *file = "/dev/tape";
struct mtop op;
struct mtpos position;
int fd, mode, idx;
if (!argv[1]) {
bb_show_usage();
}
if (strcmp(argv[1], "-f") == 0) {
if (!argv[2] || !argv[3])
bb_show_usage();
file = argv[2];
argv += 2;
}
idx = index_in_strings(opcode_name, argv[1]);
if (idx < 0)
bb_error_msg_and_die("unrecognized opcode %s", argv[1]);
op.mt_op = opcode_value[idx];
if (argv[2])
op.mt_count = xatoi_positive(argv[2]);
else
op.mt_count = 1; /* One, not zero, right? */
switch (opcode_value[idx]) {
case MTWEOF:
case MTERASE:
case MTWSM:
case MTSETDRVBUFFER:
mode = O_WRONLY;
break;
default:
mode = O_RDONLY;
break;
}
fd = xopen(file, mode);
switch (opcode_value[idx]) {
case MTTELL:
ioctl_or_perror_and_die(fd, MTIOCPOS, &position, "%s", file);
printf("At block %d\n", (int) position.mt_blkno);
break;
default:
ioctl_or_perror_and_die(fd, MTIOCTOP, &op, "%s", file);
break;
}
return EXIT_SUCCESS;
}
|
