blob: 20afd3a50b2c72eff7cbb0c836bdba06df0ca697
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * Licensed under GPLv2 or later, see file LICENSE in this source tree. |
4 | */ |
5 | |
6 | //usage:#define mt_trivial_usage |
7 | //usage: "[-f device] opcode value" |
8 | //usage:#define mt_full_usage "\n\n" |
9 | //usage: "Control magnetic tape drive operation\n" |
10 | //usage: "\n" |
11 | //usage: "Available Opcodes:\n" |
12 | //usage: "\n" |
13 | //usage: "bsf bsfm bsr bss datacompression drvbuffer eof eom erase\n" |
14 | //usage: "fsf fsfm fsr fss load lock mkpart nop offline ras1 ras2\n" |
15 | //usage: "ras3 reset retension rewind rewoffline seek setblk setdensity\n" |
16 | //usage: "setpart tell unload unlock weof wset" |
17 | |
18 | #include "libbb.h" |
19 | #include <sys/mtio.h> |
20 | |
21 | /* missing: eod/seod, stoptions, stwrthreshold, densities */ |
22 | static const short opcode_value[] = { |
23 | MTBSF, |
24 | MTBSFM, |
25 | MTBSR, |
26 | MTBSS, |
27 | MTCOMPRESSION, |
28 | MTEOM, |
29 | MTERASE, |
30 | MTFSF, |
31 | MTFSFM, |
32 | MTFSR, |
33 | MTFSS, |
34 | MTLOAD, |
35 | MTLOCK, |
36 | MTMKPART, |
37 | MTNOP, |
38 | MTOFFL, |
39 | MTOFFL, |
40 | MTRAS1, |
41 | MTRAS2, |
42 | MTRAS3, |
43 | MTRESET, |
44 | MTRETEN, |
45 | MTREW, |
46 | MTSEEK, |
47 | MTSETBLK, |
48 | MTSETDENSITY, |
49 | MTSETDRVBUFFER, |
50 | MTSETPART, |
51 | MTTELL, |
52 | MTWSM, |
53 | MTUNLOAD, |
54 | MTUNLOCK, |
55 | MTWEOF, |
56 | MTWEOF |
57 | }; |
58 | |
59 | static const char opcode_name[] ALIGN1 = |
60 | "bsf" "\0" |
61 | "bsfm" "\0" |
62 | "bsr" "\0" |
63 | "bss" "\0" |
64 | "datacompression" "\0" |
65 | "eom" "\0" |
66 | "erase" "\0" |
67 | "fsf" "\0" |
68 | "fsfm" "\0" |
69 | "fsr" "\0" |
70 | "fss" "\0" |
71 | "load" "\0" |
72 | "lock" "\0" |
73 | "mkpart" "\0" |
74 | "nop" "\0" |
75 | "offline" "\0" |
76 | "rewoffline" "\0" |
77 | "ras1" "\0" |
78 | "ras2" "\0" |
79 | "ras3" "\0" |
80 | "reset" "\0" |
81 | "retension" "\0" |
82 | "rewind" "\0" |
83 | "seek" "\0" |
84 | "setblk" "\0" |
85 | "setdensity" "\0" |
86 | "drvbuffer" "\0" |
87 | "setpart" "\0" |
88 | "tell" "\0" |
89 | "wset" "\0" |
90 | "unload" "\0" |
91 | "unlock" "\0" |
92 | "eof" "\0" |
93 | "weof" "\0"; |
94 | |
95 | int mt_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
96 | int mt_main(int argc UNUSED_PARAM, char **argv) |
97 | { |
98 | const char *file = "/dev/tape"; |
99 | struct mtop op; |
100 | struct mtpos position; |
101 | int fd, mode, idx; |
102 | |
103 | if (!argv[1]) { |
104 | bb_show_usage(); |
105 | } |
106 | |
107 | if (strcmp(argv[1], "-f") == 0) { |
108 | if (!argv[2] || !argv[3]) |
109 | bb_show_usage(); |
110 | file = argv[2]; |
111 | argv += 2; |
112 | } |
113 | |
114 | idx = index_in_strings(opcode_name, argv[1]); |
115 | |
116 | if (idx < 0) |
117 | bb_error_msg_and_die("unrecognized opcode %s", argv[1]); |
118 | |
119 | op.mt_op = opcode_value[idx]; |
120 | if (argv[2]) |
121 | op.mt_count = xatoi_positive(argv[2]); |
122 | else |
123 | op.mt_count = 1; /* One, not zero, right? */ |
124 | |
125 | switch (opcode_value[idx]) { |
126 | case MTWEOF: |
127 | case MTERASE: |
128 | case MTWSM: |
129 | case MTSETDRVBUFFER: |
130 | mode = O_WRONLY; |
131 | break; |
132 | |
133 | default: |
134 | mode = O_RDONLY; |
135 | break; |
136 | } |
137 | |
138 | fd = xopen(file, mode); |
139 | |
140 | switch (opcode_value[idx]) { |
141 | case MTTELL: |
142 | ioctl_or_perror_and_die(fd, MTIOCPOS, &position, "%s", file); |
143 | printf("At block %d\n", (int) position.mt_blkno); |
144 | break; |
145 | |
146 | default: |
147 | ioctl_or_perror_and_die(fd, MTIOCTOP, &op, "%s", file); |
148 | break; |
149 | } |
150 | |
151 | return EXIT_SUCCESS; |
152 | } |
153 |