164 lines
3.3 KiB
C
164 lines
3.3 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
|
|
*/
|
|
//config:config MT
|
|
//config: bool "mt"
|
|
//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: "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;
|
|
}
|