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
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
|
/* Copyright 2007-2008, Robert Nelson <robertn@the-nelsons.org>
* Released under terms of the GNU General Public License as
* required by the license on 'mtxl.c'.
* $Date: 2007-01-28 19:23:33 -0800 (Sun, 28 Jan 2007) $
* $Revision: 125 $
*/
/* This is a generic SCSI device control program. It operates by
* directly sending commands to the device.
*/
/*
* Commands:
* load -- Load medium
* unload -- Unload medium
* start -- Start device
* stop -- Stop device
* lock -- Lock medium
* unlock -- Unlock medium
*/
#include <stdio.h>
#include <string.h>
#include "mtx.h"
#include "mtxl.h"
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#if HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef _MSC_VER
#include <io.h>
#endif
char *argv0;
/* the device handle we're operating upon. */
static char *device; /* the device name. */
static DEVICE_TYPE DeviceFD = (DEVICE_TYPE) -1;
static int S_load(void);
static int S_unload(void);
static int S_start(void);
static int S_stop(void);
static int S_lock(void);
static int S_unlock(void);
struct command_table_struct
{
char *name;
int (*command)(void);
}
command_table[] =
{
{ "load", S_load },
{ "unload", S_unload },
{ "start", S_start },
{ "stop", S_stop },
{ "lock", S_lock },
{ "unlock", S_unlock },
{ NULL, NULL } /* terminate list */
};
void Usage(void)
{
FatalError("Usage: scsieject -f <generic-device> <command> where <command> is:\n load | unload | start | stop | lock | unlock\n");
}
/* open_device() -- set the 'DeviceFD' variable.... */
void open_device(void)
{
if (DeviceFD != -1)
{
SCSI_CloseDevice("Unknown", DeviceFD);
}
DeviceFD = SCSI_OpenDevice(device);
}
/* we see if we've got a file open. If not, we open one :-(. Then
* we execute the actual command. Or not :-(.
*/
int execute_command(struct command_table_struct *command)
{
/*
* If the device is not already open, then open it from the
* environment.
*/
if (DeviceFD == -1)
{
/* try to get it from STAPE or TAPE environment variable... */
if ((device = getenv("STAPE")) == NULL &&
(device = getenv("TAPE")) == NULL)
{
Usage(); /* Doesn't return */
}
open_device();
}
/* okay, now to execute the command... */
return command->command();
}
/* parse_args():
* Basically, we are parsing argv/argc. We can have multiple commands
* on a line, such as "load start" to load a tape and start the device.
* We execute these commands one at a time as we come to them. If we don't
* have a -f at the start and the default device isn't defined in a TAPE or
* STAPE environment variable, we exit.
*/
int parse_args(int argc, char **argv)
{
int index, retval;
struct command_table_struct *command;
argv0 = argv[0];
for (index = 1; index < argc; index++)
{
if (strcmp(argv[index], "-f") == 0)
{
index++;
if (index >= argc)
{
Usage(); /* Doesn't return */
}
device = argv[index];
open_device();
}
else
{
for (command = &command_table[0]; command->name != NULL; command++)
{
if (strcmp(command->name, argv[index]) == 0)
{
break;
}
}
if (command->name == NULL)
{
Usage(); /* Doesn't return */
}
retval = execute_command(command);
if (retval < 0)
{
/* Command failed, we probably shouldn't continue */
return retval;
}
}
}
return 0;
}
int S_load(void)
{
int result = LoadUnload(DeviceFD, 1);
if (result < 0)
{
fputs("scsieject: load failed\n", stderr);
fflush(stderr);
}
return result;
}
int S_unload(void)
{
int result = LoadUnload(DeviceFD, 0);
if (result < 0)
{
fputs("scsieject: unload failed\n", stderr);
fflush(stderr);
}
return result;
}
int S_start(void)
{
int result = StartStop(DeviceFD, 1);
if (result < 0)
{
fputs("scsieject: start failed\n", stderr);
fflush(stderr);
}
return result;
}
int S_stop(void)
{
int result = StartStop(DeviceFD, 0);
if (result < 0)
{
fputs("scsieject: stop failed\n", stderr);
fflush(stderr);
}
return result;
}
int S_lock(void)
{
int result = LockUnlock(DeviceFD, 1);
if (result < 0)
{
fputs("scsieject: lock failed\n", stderr);
fflush(stderr);
}
return result;
}
int S_unlock(void)
{
int result = LockUnlock(DeviceFD, 0);
if (result < 0)
{
fputs("scsieject: unlock failed\n", stderr);
fflush(stderr);
}
return result;
}
/* See parse_args for the scoop. parse_args does all. */
int main(int argc, char **argv)
{
parse_args(argc, argv);
if (device)
{
SCSI_CloseDevice(device, DeviceFD);
}
exit(0);
}
|
