| /* vi: set sw=4 ts=4: */ |
| /* |
| * Licensed under GPLv2 or later, see file LICENSE in this source tree. |
| */ |
| //config:config MT |
| //config: bool "mt (2.5 kb)" |
| //config: default y |
| //config: help |
| //config: mt is used to control tape devices. You can use the mt utility |
| //config: to advance or rewind a tape past a specified number of archive |
| //config: files on the tape. |
| |
| //applet:IF_MT(APPLET(mt, BB_DIR_BIN, BB_SUID_DROP)) |
| |
| //kbuild:lib-$(CONFIG_MT) += mt.o |
| |
| //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: "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[] ALIGN2 = { |
| 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; |
| } |