wmi-1.3.16 from opsview.com
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Are Casilla
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/*
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Unix SMB/CIFS implementation.
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trivial database library - private includes
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Copyright (C) Andrew Tridgell 2005
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** NOTE! The following LGPL license applies to the tdb
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** library. This does NOT imply that all of Samba is released
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** under the LGPL
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "replace.h"
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#include "system/filesys.h"
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#include "system/time.h"
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#include "system/shmem.h"
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#include "system/select.h"
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#include "tdb.h"
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#ifndef u32
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#define u32 unsigned
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#endif
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#ifndef HAVE_GETPAGESIZE
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#define getpagesize() 0x2000
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#endif
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typedef u32 tdb_len_t;
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typedef u32 tdb_off_t;
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#ifndef offsetof
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#define offsetof(t,f) ((unsigned int)&((t *)0)->f)
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#endif
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#define TDB_MAGIC_FOOD "TDB file\n"
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#define TDB_VERSION (0x26011967 + 6)
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#define TDB_MAGIC (0x26011999U)
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#define TDB_FREE_MAGIC (~TDB_MAGIC)
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#define TDB_DEAD_MAGIC (0xFEE1DEAD)
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#define TDB_RECOVERY_MAGIC (0xf53bc0e7U)
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#define TDB_ALIGNMENT 4
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#define MIN_REC_SIZE (2*sizeof(struct list_struct) + TDB_ALIGNMENT)
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#define DEFAULT_HASH_SIZE 131
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#define FREELIST_TOP (sizeof(struct tdb_header))
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#define TDB_ALIGN(x,a) (((x) + (a)-1) & ~((a)-1))
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#define TDB_BYTEREV(x) (((((x)&0xff)<<24)|((x)&0xFF00)<<8)|(((x)>>8)&0xFF00)|((x)>>24))
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#define TDB_DEAD(r) ((r)->magic == TDB_DEAD_MAGIC)
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#define TDB_BAD_MAGIC(r) ((r)->magic != TDB_MAGIC && !TDB_DEAD(r))
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#define TDB_HASH_TOP(hash) (FREELIST_TOP + (BUCKET(hash)+1)*sizeof(tdb_off_t))
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#define TDB_HASHTABLE_SIZE(tdb) ((tdb->header.hash_size+1)*sizeof(tdb_off_t))
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#define TDB_DATA_START(hash_size) TDB_HASH_TOP(hash_size-1)
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#define TDB_RECOVERY_HEAD offsetof(struct tdb_header, recovery_start)
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#define TDB_SEQNUM_OFS offsetof(struct tdb_header, sequence_number)
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#define TDB_PAD_BYTE 0x42
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#define TDB_PAD_U32 0x42424242
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/* NB assumes there is a local variable called "tdb" that is the
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* current context, also takes doubly-parenthesized print-style
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* argument. */
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#define TDB_LOG(x) tdb->log.log_fn x
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/* lock offsets */
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#define GLOBAL_LOCK 0
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#define ACTIVE_LOCK 4
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#define TRANSACTION_LOCK 8
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/* free memory if the pointer is valid and zero the pointer */
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#ifndef SAFE_FREE
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#define SAFE_FREE(x) do { if ((x) != NULL) {free(x); (x)=NULL;} } while(0)
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#endif
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#define BUCKET(hash) ((hash) % tdb->header.hash_size)
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#define DOCONV() (tdb->flags & TDB_CONVERT)
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#define CONVERT(x) (DOCONV() ? tdb_convert(&x, sizeof(x)) : &x)
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/* the body of the database is made of one list_struct for the free space
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plus a separate data list for each hash value */
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struct list_struct {
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tdb_off_t next; /* offset of the next record in the list */
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tdb_len_t rec_len; /* total byte length of record */
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tdb_len_t key_len; /* byte length of key */
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tdb_len_t data_len; /* byte length of data */
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u32 full_hash; /* the full 32 bit hash of the key */
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u32 magic; /* try to catch errors */
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/* the following union is implied:
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union {
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char record[rec_len];
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struct {
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char key[key_len];
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char data[data_len];
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}
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u32 totalsize; (tailer)
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}
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*/
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};
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/* this is stored at the front of every database */
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struct tdb_header {
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char magic_food[32]; /* for /etc/magic */
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u32 version; /* version of the code */
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u32 hash_size; /* number of hash entries */
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tdb_off_t rwlocks; /* obsolete - kept to detect old formats */
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tdb_off_t recovery_start; /* offset of transaction recovery region */
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tdb_off_t sequence_number; /* used when TDB_SEQNUM is set */
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tdb_off_t reserved[29];
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};
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struct tdb_lock_type {
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u32 count;
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u32 ltype;
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};
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struct tdb_traverse_lock {
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struct tdb_traverse_lock *next;
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u32 off;
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u32 hash;
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int lock_rw;
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};
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struct tdb_methods {
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int (*tdb_read)(struct tdb_context *, tdb_off_t , void *, tdb_len_t , int );
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int (*tdb_write)(struct tdb_context *, tdb_off_t, const void *, tdb_len_t);
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void (*next_hash_chain)(struct tdb_context *, u32 *);
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int (*tdb_oob)(struct tdb_context *, tdb_off_t , int );
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int (*tdb_expand_file)(struct tdb_context *, tdb_off_t , tdb_off_t );
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int (*tdb_brlock)(struct tdb_context *, tdb_off_t , int, int, int, size_t);
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};
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struct tdb_context {
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char *name; /* the name of the database */
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void *map_ptr; /* where it is currently mapped */
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int fd; /* open file descriptor for the database */
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tdb_len_t map_size; /* how much space has been mapped */
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int read_only; /* opened read-only */
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int traverse_read; /* read-only traversal */
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struct tdb_lock_type global_lock;
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struct tdb_lock_type *locked; /* array of chain locks */
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enum TDB_ERROR ecode; /* error code for last tdb error */
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struct tdb_header header; /* a cached copy of the header */
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u32 flags; /* the flags passed to tdb_open */
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struct tdb_traverse_lock travlocks; /* current traversal locks */
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struct tdb_context *next; /* all tdbs to avoid multiple opens */
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dev_t device; /* uniquely identifies this tdb */
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ino_t inode; /* uniquely identifies this tdb */
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struct tdb_logging_context log;
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unsigned int (*hash_fn)(TDB_DATA *key);
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int open_flags; /* flags used in the open - needed by reopen */
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unsigned int num_locks; /* number of chain locks held */
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const struct tdb_methods *methods;
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struct tdb_transaction *transaction;
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int page_size;
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};
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/*
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internal prototypes
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*/
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int tdb_munmap(struct tdb_context *tdb);
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void tdb_mmap(struct tdb_context *tdb);
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int tdb_lock(struct tdb_context *tdb, int list, int ltype);
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int tdb_unlock(struct tdb_context *tdb, int list, int ltype);
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int tdb_brlock(struct tdb_context *tdb, tdb_off_t offset, int rw_type, int lck_type, int probe, size_t len);
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int tdb_brlock_upgrade(struct tdb_context *tdb, tdb_off_t offset, size_t len);
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int tdb_write_lock_record(struct tdb_context *tdb, tdb_off_t off);
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int tdb_write_unlock_record(struct tdb_context *tdb, tdb_off_t off);
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int tdb_ofs_read(struct tdb_context *tdb, tdb_off_t offset, tdb_off_t *d);
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int tdb_ofs_write(struct tdb_context *tdb, tdb_off_t offset, tdb_off_t *d);
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void *tdb_convert(void *buf, u32 size);
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int tdb_free(struct tdb_context *tdb, tdb_off_t offset, struct list_struct *rec);
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tdb_off_t tdb_allocate(struct tdb_context *tdb, tdb_len_t length, struct list_struct *rec);
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int tdb_ofs_read(struct tdb_context *tdb, tdb_off_t offset, tdb_off_t *d);
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int tdb_ofs_write(struct tdb_context *tdb, tdb_off_t offset, tdb_off_t *d);
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int tdb_lock_record(struct tdb_context *tdb, tdb_off_t off);
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int tdb_unlock_record(struct tdb_context *tdb, tdb_off_t off);
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int tdb_rec_read(struct tdb_context *tdb, tdb_off_t offset, struct list_struct *rec);
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int tdb_rec_write(struct tdb_context *tdb, tdb_off_t offset, struct list_struct *rec);
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int tdb_do_delete(struct tdb_context *tdb, tdb_off_t rec_ptr, struct list_struct *rec);
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unsigned char *tdb_alloc_read(struct tdb_context *tdb, tdb_off_t offset, tdb_len_t len);
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tdb_off_t tdb_find_lock_hash(struct tdb_context *tdb, TDB_DATA key, u32 hash, int locktype,
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struct list_struct *rec);
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void tdb_io_init(struct tdb_context *tdb);
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int tdb_expand(struct tdb_context *tdb, tdb_off_t size);
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