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
|
/* mtinfo.h: Defininitions for the Cygwin tape driver class.
This file is part of Cygwin.
This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
/* Maximum number of supported partitions per drive. */
#define MAX_PARTITION_NUM 64
/* Maximum number of supported drives. */
#define MAX_DRIVE_NUM 8
/* Values for bookkeeping of the tape position relative to filemarks
and eod/eom. */
enum eom_val
{
no_eof,
eof_hit,
eof,
eod_hit,
eod,
eom_hit,
eom
};
enum dirty_state
{
clean,
has_read,
has_written,
async_write_pending
};
enum lock_state
{
unlocked,
lock_error,
auto_locked,
locked
};
/* Partition specific information */
class mtinfo_part
{
public:
int64_t block; /* logical block no */
int64_t fblock; /* relative block no */
int32_t file; /* current file no */
bool smark; /* At setmark? */
eom_val emark; /* "end-of"-mark */
void initialize (int64_t nblock = -1);
};
class mtinfo_drive
{
int drive;
int lasterr;
int32_t partition;
int64_t block;
dirty_state dirty;
lock_state lock;
TAPE_GET_DRIVE_PARAMETERS _dp;
TAPE_GET_MEDIA_PARAMETERS _mp;
/* sizeof(OVERLAPPED) == 20 on 32 bit, 32 on 64 bit. A drive is always
opened exclusively by a single process, though, so instead of the
OVERLAPPED structure, we just keep track of the pointer to the
OVERLAPPED structure in the application's fhandler. */
LPOVERLAPPED ov;
struct status_flags
{
unsigned buffer_writes : 1;
unsigned async_writes : 1;
unsigned two_fm : 1;
unsigned fast_eom : 1;
unsigned auto_lock : 1;
unsigned sysv : 1;
unsigned nowait : 1;
} status;
mtinfo_part _part[MAX_PARTITION_NUM];
inline int error (const char *str)
{
if (lasterr)
debug_printf ("%s: Win32 error %d", str, lasterr);
return lasterr;
}
inline bool get_feature (DWORD parm)
{
return ((parm & TAPE_DRIVE_HIGH_FEATURES)
? ((_dp.FeaturesHigh & parm) != 0)
: ((_dp.FeaturesLow & parm) != 0));
}
int get_pos (HANDLE mt, int32_t *ppartition = NULL, int64_t *pblock = NULL);
int _set_pos (HANDLE mt, int mode, int64_t count, int partition, BOOL dont_wait);
int create_partitions (HANDLE mt, int32_t count);
int set_partition (HANDLE mt, int32_t count);
int write_marks (HANDLE mt, int marktype, DWORD count);
int erase (HANDLE mt, int mode);
int prepare (HANDLE mt, int action, bool is_auto = false);
int set_compression (HANDLE mt, int32_t count);
int set_blocksize (HANDLE mt, DWORD count);
int get_status (HANDLE mt, struct mtget *get);
int set_options (HANDLE mt, int32_t options);
int async_wait (HANDLE mt, DWORD *bytes_written);
public:
void initialize (int num, bool first_time);
int get_dp (HANDLE mt);
int get_mp (HANDLE mt);
int open (HANDLE mt);
int close (HANDLE mt, bool rewind);
int read (HANDLE mt, LPOVERLAPPED pov, void *ptr, size_t &ulen);
int write (HANDLE mt, LPOVERLAPPED pov, const void *ptr, size_t &len);
int ioctl (HANDLE mt, unsigned int cmd, void *buf);
int set_pos (HANDLE mt, int mode, int64_t count, bool sfm_func);
IMPLEMENT_STATUS_FLAG (bool, buffer_writes)
IMPLEMENT_STATUS_FLAG (bool, async_writes)
IMPLEMENT_STATUS_FLAG (bool, two_fm)
IMPLEMENT_STATUS_FLAG (bool, fast_eom)
IMPLEMENT_STATUS_FLAG (bool, auto_lock)
IMPLEMENT_STATUS_FLAG (bool, sysv)
IMPLEMENT_STATUS_FLAG (bool, nowait)
PTAPE_GET_DRIVE_PARAMETERS dp () { return &_dp; }
PTAPE_GET_MEDIA_PARAMETERS mp () { return &_mp; }
mtinfo_part *part (int num) { return &_part[num]; }
};
class mtinfo
{
mtinfo_drive _drive[MAX_DRIVE_NUM];
public:
void initialize ();
mtinfo_drive *drive (int num) { return &_drive[num]; }
};
|
