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
|
#ifndef __TDB_H__
#define __TDB_H__
/*
Unix SMB/CIFS implementation.
trivial database library
Copyright (C) Andrew Tridgell 1999-2004
** NOTE! The following LGPL license applies to the tdb
** library. This does NOT imply that all of Samba is released
** under the LGPL
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifdef __cplusplus
extern "C" {
#endif
/* flags to tdb_store() */
#define TDB_REPLACE 1
#define TDB_INSERT 2
#define TDB_MODIFY 3
/* flags for tdb_open() */
#define TDB_DEFAULT 0 /* just a readability place holder */
#define TDB_CLEAR_IF_FIRST 1
#define TDB_INTERNAL 2 /* don't store on disk */
#define TDB_NOLOCK 4 /* don't do any locking */
#define TDB_NOMMAP 8 /* don't use mmap */
#define TDB_CONVERT 16 /* convert endian (internal use) */
#define TDB_BIGENDIAN 32 /* header is big-endian (internal use) */
#define TDB_ERRCODE(code, ret) ((tdb->ecode = (code)), ret)
/* error codes */
enum TDB_ERROR {TDB_SUCCESS=0, TDB_ERR_CORRUPT, TDB_ERR_IO, TDB_ERR_LOCK,
TDB_ERR_OOM, TDB_ERR_EXISTS, TDB_ERR_NOLOCK, TDB_ERR_LOCK_TIMEOUT,
TDB_ERR_NOEXIST};
#ifndef u32
#define u32 unsigned
#endif
typedef struct {
char *dptr;
size_t dsize;
} TDB_DATA;
typedef u32 tdb_len;
typedef u32 tdb_off;
/* this is stored at the front of every database */
struct tdb_header {
char magic_food[32]; /* for /etc/magic */
u32 version; /* version of the code */
u32 hash_size; /* number of hash entries */
tdb_off rwlocks;
tdb_off reserved[31];
};
struct tdb_lock_type {
u32 count;
u32 ltype;
};
struct tdb_traverse_lock {
struct tdb_traverse_lock *next;
u32 off;
u32 hash;
};
/* this is the context structure that is returned from a db open */
typedef struct tdb_context {
char *name; /* the name of the database */
void *map_ptr; /* where it is currently mapped */
int fd; /* open file descriptor for the database */
tdb_len map_size; /* how much space has been mapped */
int read_only; /* opened read-only */
struct tdb_lock_type *locked; /* array of chain locks */
enum TDB_ERROR ecode; /* error code for last tdb error */
struct tdb_header header; /* a cached copy of the header */
u32 flags; /* the flags passed to tdb_open */
u32 *lockedkeys; /* array of locked keys: first is #keys */
struct tdb_traverse_lock travlocks; /* current traversal locks */
struct tdb_context *next; /* all tdbs to avoid multiple opens */
dev_t device; /* uniquely identifies this tdb */
ino_t inode; /* uniquely identifies this tdb */
void (*log_fn)(struct tdb_context *tdb, int level, const char *, ...); /* logging function */
int open_flags; /* flags used in the open - needed by reopen */
} TDB_CONTEXT;
typedef int (*tdb_traverse_func)(TDB_CONTEXT *, TDB_DATA, TDB_DATA, void *);
typedef void (*tdb_log_func)(TDB_CONTEXT *, int , const char *, ...);
TDB_CONTEXT *tdb_open(const char *name, int hash_size, int tdb_flags,
int open_flags, mode_t mode);
TDB_CONTEXT *tdb_open_ex(const char *name, int hash_size, int tdb_flags,
int open_flags, mode_t mode,
tdb_log_func log_fn);
int tdb_reopen(TDB_CONTEXT *tdb);
int tdb_reopen_all(void);
void tdb_logging_function(TDB_CONTEXT *tdb, tdb_log_func);
enum TDB_ERROR tdb_error(TDB_CONTEXT *tdb);
const char *tdb_errorstr(TDB_CONTEXT *tdb);
TDB_DATA tdb_fetch(TDB_CONTEXT *tdb, TDB_DATA key);
int tdb_delete(TDB_CONTEXT *tdb, TDB_DATA key);
int tdb_store(TDB_CONTEXT *tdb, TDB_DATA key, TDB_DATA dbuf, int flag);
int tdb_append(TDB_CONTEXT *tdb, TDB_DATA key, TDB_DATA new_dbuf);
int tdb_close(TDB_CONTEXT *tdb);
TDB_DATA tdb_firstkey(TDB_CONTEXT *tdb);
TDB_DATA tdb_nextkey(TDB_CONTEXT *tdb, TDB_DATA key);
int tdb_traverse(TDB_CONTEXT *tdb, tdb_traverse_func fn, void *);
int tdb_exists(TDB_CONTEXT *tdb, TDB_DATA key);
int tdb_lockkeys(TDB_CONTEXT *tdb, u32 number, TDB_DATA keys[]);
void tdb_unlockkeys(TDB_CONTEXT *tdb);
int tdb_lockall(TDB_CONTEXT *tdb);
void tdb_unlockall(TDB_CONTEXT *tdb);
/* Low level locking functions: use with care */
void tdb_set_lock_alarm(sig_atomic_t *palarm);
int tdb_chainlock(TDB_CONTEXT *tdb, TDB_DATA key);
int tdb_chainunlock(TDB_CONTEXT *tdb, TDB_DATA key);
/* Debug functions. Not used in production. */
void tdb_dump_all(TDB_CONTEXT *tdb);
int tdb_printfreelist(TDB_CONTEXT *tdb);
extern TDB_DATA tdb_null;
#ifdef __cplusplus
}
#endif
#endif /* tdb.h */
|
