/*
Trivial Database 2: opening and closing TDBs
Copyright (C) Rusty Russell 2010
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 3 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, see .
*/
#include "private.h"
#include
#include
/* all tdbs, to detect double-opens (fcntl file don't nest!) */
static struct tdb_context *tdbs = NULL;
static struct tdb_file *find_file(dev_t device, ino_t ino)
{
struct tdb_context *i;
for (i = tdbs; i; i = i->next) {
if (i->file->device == device && i->file->inode == ino) {
i->file->refcnt++;
return i->file;
}
}
return NULL;
}
static bool read_all(int fd, void *buf, size_t len)
{
while (len) {
ssize_t ret;
ret = read(fd, buf, len);
if (ret < 0)
return false;
if (ret == 0) {
/* ETOOSHORT? */
errno = EWOULDBLOCK;
return false;
}
buf = (char *)buf + ret;
len -= ret;
}
return true;
}
static uint64_t random_number(struct tdb_context *tdb)
{
int fd;
uint64_t ret = 0;
struct timeval now;
fd = open("/dev/urandom", O_RDONLY);
if (fd >= 0) {
if (read_all(fd, &ret, sizeof(ret))) {
close(fd);
return ret;
}
close(fd);
}
/* FIXME: Untested! Based on Wikipedia protocol description! */
fd = open("/dev/egd-pool", O_RDWR);
if (fd >= 0) {
/* Command is 1, next byte is size we want to read. */
char cmd[2] = { 1, sizeof(uint64_t) };
if (write(fd, cmd, sizeof(cmd)) == sizeof(cmd)) {
char reply[1 + sizeof(uint64_t)];
int r = read(fd, reply, sizeof(reply));
if (r > 1) {
/* Copy at least some bytes. */
memcpy(&ret, reply+1, r - 1);
if (reply[0] == sizeof(uint64_t)
&& r == sizeof(reply)) {
close(fd);
return ret;
}
}
}
close(fd);
}
/* Fallback: pid and time. */
gettimeofday(&now, NULL);
ret = getpid() * 100132289ULL + now.tv_sec * 1000000ULL + now.tv_usec;
tdb_logerr(tdb, TDB_SUCCESS, TDB_LOG_WARNING,
"tdb_open: random from getpid and time");
return ret;
}
static void tdb2_context_init(struct tdb_context *tdb)
{
/* Initialize the TDB2 fields here */
tdb_io_init(tdb);
tdb->tdb2.direct_access = 0;
tdb->tdb2.transaction = NULL;
tdb->tdb2.access = NULL;
}
struct new_database {
struct tdb_header hdr;
struct tdb_freetable ftable;
};
/* initialise a new database */
static enum TDB_ERROR tdb_new_database(struct tdb_context *tdb,
struct tdb_attribute_seed *seed,
struct tdb_header *hdr)
{
/* We make it up in memory, then write it out if not internal */
struct new_database newdb;
unsigned int magic_len;
ssize_t rlen;
enum TDB_ERROR ecode;
/* Fill in the header */
newdb.hdr.version = TDB_VERSION;
if (seed)
newdb.hdr.hash_seed = seed->seed;
else
newdb.hdr.hash_seed = random_number(tdb);
newdb.hdr.hash_test = TDB_HASH_MAGIC;
newdb.hdr.hash_test = tdb->hash_fn(&newdb.hdr.hash_test,
sizeof(newdb.hdr.hash_test),
newdb.hdr.hash_seed,
tdb->hash_data);
newdb.hdr.recovery = 0;
newdb.hdr.features_used = newdb.hdr.features_offered = TDB_FEATURE_MASK;
newdb.hdr.seqnum = 0;
newdb.hdr.capabilities = 0;
memset(newdb.hdr.reserved, 0, sizeof(newdb.hdr.reserved));
/* Initial hashes are empty. */
memset(newdb.hdr.hashtable, 0, sizeof(newdb.hdr.hashtable));
/* Free is empty. */
newdb.hdr.free_table = offsetof(struct new_database, ftable);
memset(&newdb.ftable, 0, sizeof(newdb.ftable));
ecode = set_header(NULL, &newdb.ftable.hdr, TDB_FTABLE_MAGIC, 0,
sizeof(newdb.ftable) - sizeof(newdb.ftable.hdr),
sizeof(newdb.ftable) - sizeof(newdb.ftable.hdr),
0);
if (ecode != TDB_SUCCESS) {
return ecode;
}
/* Magic food */
memset(newdb.hdr.magic_food, 0, sizeof(newdb.hdr.magic_food));
strcpy(newdb.hdr.magic_food, TDB_MAGIC_FOOD);
/* This creates an endian-converted database, as if read from disk */
magic_len = sizeof(newdb.hdr.magic_food);
tdb_convert(tdb,
(char *)&newdb.hdr + magic_len, sizeof(newdb) - magic_len);
*hdr = newdb.hdr;
if (tdb->flags & TDB_INTERNAL) {
tdb->file->map_size = sizeof(newdb);
tdb->file->map_ptr = malloc(tdb->file->map_size);
if (!tdb->file->map_ptr) {
return tdb_logerr(tdb, TDB_ERR_OOM, TDB_LOG_ERROR,
"tdb_new_database:"
" failed to allocate");
}
memcpy(tdb->file->map_ptr, &newdb, tdb->file->map_size);
return TDB_SUCCESS;
}
if (lseek(tdb->file->fd, 0, SEEK_SET) == -1) {
return tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
"tdb_new_database:"
" failed to seek: %s", strerror(errno));
}
if (ftruncate(tdb->file->fd, 0) == -1) {
return tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
"tdb_new_database:"
" failed to truncate: %s", strerror(errno));
}
rlen = write(tdb->file->fd, &newdb, sizeof(newdb));
if (rlen != sizeof(newdb)) {
if (rlen >= 0)
errno = ENOSPC;
return tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
"tdb_new_database: %zi writing header: %s",
rlen, strerror(errno));
}
return TDB_SUCCESS;
}
static enum TDB_ERROR tdb_new_file(struct tdb_context *tdb)
{
tdb->file = malloc(sizeof(*tdb->file));
if (!tdb->file)
return tdb_logerr(tdb, TDB_ERR_OOM, TDB_LOG_ERROR,
"tdb_open: cannot alloc tdb_file structure");
tdb->file->num_lockrecs = 0;
tdb->file->lockrecs = NULL;
tdb->file->allrecord_lock.count = 0;
tdb->file->refcnt = 1;
tdb->file->map_ptr = NULL;
return TDB_SUCCESS;
}
_PUBLIC_ enum TDB_ERROR tdb_set_attribute(struct tdb_context *tdb,
const union tdb_attribute *attr)
{
switch (attr->base.attr) {
case TDB_ATTRIBUTE_LOG:
tdb->log_fn = attr->log.fn;
tdb->log_data = attr->log.data;
break;
case TDB_ATTRIBUTE_HASH:
case TDB_ATTRIBUTE_SEED:
case TDB_ATTRIBUTE_OPENHOOK:
return tdb->last_error
= tdb_logerr(tdb, TDB_ERR_EINVAL,
TDB_LOG_USE_ERROR,
"tdb_set_attribute:"
" cannot set %s after opening",
attr->base.attr == TDB_ATTRIBUTE_HASH
? "TDB_ATTRIBUTE_HASH"
: attr->base.attr == TDB_ATTRIBUTE_SEED
? "TDB_ATTRIBUTE_SEED"
: "TDB_ATTRIBUTE_OPENHOOK");
case TDB_ATTRIBUTE_STATS:
return tdb->last_error
= tdb_logerr(tdb, TDB_ERR_EINVAL,
TDB_LOG_USE_ERROR,
"tdb_set_attribute:"
" cannot set TDB_ATTRIBUTE_STATS");
case TDB_ATTRIBUTE_FLOCK:
tdb->lock_fn = attr->flock.lock;
tdb->unlock_fn = attr->flock.unlock;
tdb->lock_data = attr->flock.data;
break;
default:
return tdb->last_error
= tdb_logerr(tdb, TDB_ERR_EINVAL,
TDB_LOG_USE_ERROR,
"tdb_set_attribute:"
" unknown attribute type %u",
attr->base.attr);
}
return TDB_SUCCESS;
}
_PUBLIC_ enum TDB_ERROR tdb_get_attribute(struct tdb_context *tdb,
union tdb_attribute *attr)
{
switch (attr->base.attr) {
case TDB_ATTRIBUTE_LOG:
if (!tdb->log_fn)
return tdb->last_error = TDB_ERR_NOEXIST;
attr->log.fn = tdb->log_fn;
attr->log.data = tdb->log_data;
break;
case TDB_ATTRIBUTE_HASH:
attr->hash.fn = tdb->hash_fn;
attr->hash.data = tdb->hash_data;
break;
case TDB_ATTRIBUTE_SEED:
attr->seed.seed = tdb->hash_seed;
break;
case TDB_ATTRIBUTE_OPENHOOK:
if (!tdb->openhook)
return tdb->last_error = TDB_ERR_NOEXIST;
attr->openhook.fn = tdb->openhook;
attr->openhook.data = tdb->openhook_data;
break;
case TDB_ATTRIBUTE_STATS: {
size_t size = attr->stats.size;
if (size > tdb->stats.size)
size = tdb->stats.size;
memcpy(&attr->stats, &tdb->stats, size);
break;
}
case TDB_ATTRIBUTE_FLOCK:
attr->flock.lock = tdb->lock_fn;
attr->flock.unlock = tdb->unlock_fn;
attr->flock.data = tdb->lock_data;
break;
default:
return tdb->last_error
= tdb_logerr(tdb, TDB_ERR_EINVAL,
TDB_LOG_USE_ERROR,
"tdb_get_attribute:"
" unknown attribute type %u",
attr->base.attr);
}
attr->base.next = NULL;
return TDB_SUCCESS;
}
_PUBLIC_ void tdb_unset_attribute(struct tdb_context *tdb,
enum tdb_attribute_type type)
{
switch (type) {
case TDB_ATTRIBUTE_LOG:
tdb->log_fn = NULL;
break;
case TDB_ATTRIBUTE_OPENHOOK:
tdb->openhook = NULL;
break;
case TDB_ATTRIBUTE_HASH:
case TDB_ATTRIBUTE_SEED:
tdb_logerr(tdb, TDB_ERR_EINVAL, TDB_LOG_USE_ERROR,
"tdb_unset_attribute: cannot unset %s after opening",
type == TDB_ATTRIBUTE_HASH
? "TDB_ATTRIBUTE_HASH"
: "TDB_ATTRIBUTE_SEED");
break;
case TDB_ATTRIBUTE_STATS:
tdb_logerr(tdb, TDB_ERR_EINVAL,
TDB_LOG_USE_ERROR,
"tdb_unset_attribute:"
"cannot unset TDB_ATTRIBUTE_STATS");
break;
case TDB_ATTRIBUTE_FLOCK:
tdb->lock_fn = tdb_fcntl_lock;
tdb->unlock_fn = tdb_fcntl_unlock;
break;
default:
tdb_logerr(tdb, TDB_ERR_EINVAL,
TDB_LOG_USE_ERROR,
"tdb_unset_attribute: unknown attribute type %u",
type);
}
}
/* The top three bits of the capability tell us whether it matters. */
enum TDB_ERROR unknown_capability(struct tdb_context *tdb, const char *caller,
tdb_off_t type)
{
if (type & TDB_CAP_NOOPEN) {
return tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
"%s: file has unknown capability %llu",
caller, type & TDB_CAP_NOOPEN);
}
if ((type & TDB_CAP_NOWRITE) && !(tdb->flags & TDB_RDONLY)) {
return tdb_logerr(tdb, TDB_ERR_RDONLY, TDB_LOG_ERROR,
"%s: file has unknown capability %llu"
" (cannot write to it)",
caller, type & TDB_CAP_NOOPEN);
}
if (type & TDB_CAP_NOCHECK) {
tdb->flags |= TDB_CANT_CHECK;
}
return TDB_SUCCESS;
}
static enum TDB_ERROR capabilities_ok(struct tdb_context *tdb,
tdb_off_t capabilities)
{
tdb_off_t off, next;
enum TDB_ERROR ecode = TDB_SUCCESS;
const struct tdb_capability *cap;
/* Check capability list. */
for (off = capabilities; off && ecode == TDB_SUCCESS; off = next) {
cap = tdb_access_read(tdb, off, sizeof(*cap), true);
if (TDB_PTR_IS_ERR(cap)) {
return TDB_PTR_ERR(cap);
}
switch (cap->type & TDB_CAP_TYPE_MASK) {
/* We don't understand any capabilities (yet). */
default:
ecode = unknown_capability(tdb, "tdb_open", cap->type);
}
next = cap->next;
tdb_access_release(tdb, cap);
}
return ecode;
}
_PUBLIC_ struct tdb_context *tdb_open(const char *name, int tdb_flags,
int open_flags, mode_t mode,
union tdb_attribute *attr)
{
struct tdb_context *tdb;
struct stat st;
int saved_errno = 0;
uint64_t hash_test;
unsigned v;
ssize_t rlen;
struct tdb_header hdr;
struct tdb_attribute_seed *seed = NULL;
tdb_bool_err berr;
enum TDB_ERROR ecode;
int openlock;
tdb = malloc(sizeof(*tdb) + (name ? strlen(name) + 1 : 0));
if (!tdb) {
/* Can't log this */
errno = ENOMEM;
return NULL;
}
/* Set name immediately for logging functions. */
if (name) {
tdb->name = strcpy((char *)(tdb + 1), name);
} else {
tdb->name = NULL;
}
tdb->flags = tdb_flags;
tdb->log_fn = NULL;
tdb->open_flags = open_flags;
tdb->last_error = TDB_SUCCESS;
tdb->file = NULL;
tdb->openhook = NULL;
tdb->lock_fn = tdb_fcntl_lock;
tdb->unlock_fn = tdb_fcntl_unlock;
tdb->hash_fn = tdb_jenkins_hash;
memset(&tdb->stats, 0, sizeof(tdb->stats));
tdb->stats.base.attr = TDB_ATTRIBUTE_STATS;
tdb->stats.size = sizeof(tdb->stats);
while (attr) {
switch (attr->base.attr) {
case TDB_ATTRIBUTE_HASH:
tdb->hash_fn = attr->hash.fn;
tdb->hash_data = attr->hash.data;
break;
case TDB_ATTRIBUTE_SEED:
seed = &attr->seed;
break;
case TDB_ATTRIBUTE_OPENHOOK:
tdb->openhook = attr->openhook.fn;
tdb->openhook_data = attr->openhook.data;
break;
default:
/* These are set as normal. */
ecode = tdb_set_attribute(tdb, attr);
if (ecode != TDB_SUCCESS)
goto fail;
}
attr = attr->base.next;
}
if (tdb_flags & ~(TDB_INTERNAL | TDB_NOLOCK | TDB_NOMMAP | TDB_CONVERT
| TDB_NOSYNC | TDB_SEQNUM | TDB_ALLOW_NESTING
| TDB_RDONLY)) {
ecode = tdb_logerr(tdb, TDB_ERR_EINVAL, TDB_LOG_USE_ERROR,
"tdb_open: unknown flags %u", tdb_flags);
goto fail;
}
if (seed) {
if (!(tdb_flags & TDB_INTERNAL) && !(open_flags & O_CREAT)) {
ecode = tdb_logerr(tdb, TDB_ERR_EINVAL,
TDB_LOG_USE_ERROR,
"tdb_open:"
" cannot set TDB_ATTRIBUTE_SEED"
" without O_CREAT.");
goto fail;
}
}
if ((open_flags & O_ACCMODE) == O_WRONLY) {
ecode = tdb_logerr(tdb, TDB_ERR_EINVAL, TDB_LOG_USE_ERROR,
"tdb_open: can't open tdb %s write-only",
name);
goto fail;
}
if ((open_flags & O_ACCMODE) == O_RDONLY) {
openlock = F_RDLCK;
tdb->flags |= TDB_RDONLY;
} else {
if (tdb_flags & TDB_RDONLY) {
ecode = tdb_logerr(tdb, TDB_ERR_EINVAL,
TDB_LOG_USE_ERROR,
"tdb_open: can't use TDB_RDONLY"
" without O_RDONLY");
goto fail;
}
openlock = F_WRLCK;
}
/* internal databases don't need any of the rest. */
if (tdb->flags & TDB_INTERNAL) {
tdb->flags |= (TDB_NOLOCK | TDB_NOMMAP);
ecode = tdb_new_file(tdb);
if (ecode != TDB_SUCCESS) {
goto fail;
}
tdb->file->fd = -1;
ecode = tdb_new_database(tdb, seed, &hdr);
if (ecode == TDB_SUCCESS) {
tdb_convert(tdb, &hdr.hash_seed,
sizeof(hdr.hash_seed));
tdb->hash_seed = hdr.hash_seed;
tdb2_context_init(tdb);
tdb_ftable_init(tdb);
}
if (ecode != TDB_SUCCESS) {
goto fail;
}
return tdb;
}
if (stat(name, &st) != -1)
tdb->file = find_file(st.st_dev, st.st_ino);
if (!tdb->file) {
int fd;
if ((fd = open(name, open_flags, mode)) == -1) {
/* errno set by open(2) */
saved_errno = errno;
tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
"tdb_open: could not open file %s: %s",
name, strerror(errno));
goto fail_errno;
}
/* on exec, don't inherit the fd */
v = fcntl(fd, F_GETFD, 0);
fcntl(fd, F_SETFD, v | FD_CLOEXEC);
if (fstat(fd, &st) == -1) {
saved_errno = errno;
tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
"tdb_open: could not stat open %s: %s",
name, strerror(errno));
close(fd);
goto fail_errno;
}
ecode = tdb_new_file(tdb);
if (ecode != TDB_SUCCESS) {
close(fd);
goto fail;
}
tdb->file->fd = fd;
tdb->file->device = st.st_dev;
tdb->file->inode = st.st_ino;
tdb->file->map_ptr = NULL;
tdb->file->map_size = 0;
}
/* ensure there is only one process initialising at once */
ecode = tdb_lock_open(tdb, openlock, TDB_LOCK_WAIT|TDB_LOCK_NOCHECK);
if (ecode != TDB_SUCCESS) {
saved_errno = errno;
goto fail_errno;
}
/* call their open hook if they gave us one. */
if (tdb->openhook) {
ecode = tdb->openhook(tdb->file->fd, tdb->openhook_data);
if (ecode != TDB_SUCCESS) {
tdb_logerr(tdb, ecode, TDB_LOG_ERROR,
"tdb_open: open hook failed");
goto fail;
}
open_flags |= O_CREAT;
}
/* If they used O_TRUNC, read will return 0. */
rlen = pread(tdb->file->fd, &hdr, sizeof(hdr), 0);
if (rlen == 0 && (open_flags & O_CREAT)) {
ecode = tdb_new_database(tdb, seed, &hdr);
if (ecode != TDB_SUCCESS) {
goto fail;
}
} else if (rlen < 0) {
ecode = tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
"tdb_open: error %s reading %s",
strerror(errno), name);
goto fail;
} else if (rlen < sizeof(hdr)
|| strcmp(hdr.magic_food, TDB_MAGIC_FOOD) != 0) {
ecode = tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
"tdb_open: %s is not a tdb2 file", name);
goto fail;
}
if (hdr.version != TDB_VERSION) {
if (hdr.version == bswap_64(TDB_VERSION))
tdb->flags |= TDB_CONVERT;
else {
/* wrong version */
ecode = tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
"tdb_open:"
" %s is unknown version 0x%llx",
name, (long long)hdr.version);
goto fail;
}
} else if (tdb->flags & TDB_CONVERT) {
ecode = tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
"tdb_open:"
" %s does not need TDB_CONVERT",
name);
goto fail;
}
tdb2_context_init(tdb);
tdb_convert(tdb, &hdr, sizeof(hdr));
tdb->hash_seed = hdr.hash_seed;
hash_test = TDB_HASH_MAGIC;
hash_test = tdb_hash(tdb, &hash_test, sizeof(hash_test));
if (hdr.hash_test != hash_test) {
/* wrong hash variant */
ecode = tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
"tdb_open:"
" %s uses a different hash function",
name);
goto fail;
}
ecode = capabilities_ok(tdb, hdr.capabilities);
if (ecode != TDB_SUCCESS) {
goto fail;
}
/* Clear any features we don't understand. */
if ((open_flags & O_ACCMODE) != O_RDONLY) {
hdr.features_used &= TDB_FEATURE_MASK;
ecode = tdb_write_convert(tdb, offsetof(struct tdb_header,
features_used),
&hdr.features_used,
sizeof(hdr.features_used));
if (ecode != TDB_SUCCESS)
goto fail;
}
tdb_unlock_open(tdb, openlock);
/* This makes sure we have current map_size and mmap. */
ecode = tdb->tdb2.io->oob(tdb, tdb->file->map_size, 1, true);
if (unlikely(ecode != TDB_SUCCESS))
goto fail;
/* Now it's fully formed, recover if necessary. */
berr = tdb_needs_recovery(tdb);
if (unlikely(berr != false)) {
if (berr < 0) {
ecode = TDB_OFF_TO_ERR(berr);
goto fail;
}
ecode = tdb_lock_and_recover(tdb);
if (ecode != TDB_SUCCESS) {
goto fail;
}
}
ecode = tdb_ftable_init(tdb);
if (ecode != TDB_SUCCESS) {
goto fail;
}
tdb->next = tdbs;
tdbs = tdb;
return tdb;
fail:
/* Map ecode to some logical errno. */
switch (TDB_ERR_TO_OFF(ecode)) {
case TDB_ERR_TO_OFF(TDB_ERR_CORRUPT):
case TDB_ERR_TO_OFF(TDB_ERR_IO):
saved_errno = EIO;
break;
case TDB_ERR_TO_OFF(TDB_ERR_LOCK):
saved_errno = EWOULDBLOCK;
break;
case TDB_ERR_TO_OFF(TDB_ERR_OOM):
saved_errno = ENOMEM;
break;
case TDB_ERR_TO_OFF(TDB_ERR_EINVAL):
saved_errno = EINVAL;
break;
default:
saved_errno = EINVAL;
break;
}
fail_errno:
#ifdef TDB_TRACE
close(tdb->tracefd);
#endif
if (tdb->file) {
tdb_lock_cleanup(tdb);
if (--tdb->file->refcnt == 0) {
assert(tdb->file->num_lockrecs == 0);
if (tdb->file->map_ptr) {
if (tdb->flags & TDB_INTERNAL) {
free(tdb->file->map_ptr);
} else
tdb_munmap(tdb->file);
}
if (close(tdb->file->fd) != 0)
tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
"tdb_open: failed to close tdb fd"
" on error: %s", strerror(errno));
free(tdb->file->lockrecs);
free(tdb->file);
}
}
free(tdb);
errno = saved_errno;
return NULL;
}
_PUBLIC_ int tdb_close(struct tdb_context *tdb)
{
int ret = 0;
struct tdb_context **i;
tdb_trace(tdb, "tdb_close");
if (tdb->tdb2.transaction) {
tdb_transaction_cancel(tdb);
}
if (tdb->file->map_ptr) {
if (tdb->flags & TDB_INTERNAL)
free(tdb->file->map_ptr);
else
tdb_munmap(tdb->file);
}
if (tdb->file) {
tdb_lock_cleanup(tdb);
if (--tdb->file->refcnt == 0) {
ret = close(tdb->file->fd);
free(tdb->file->lockrecs);
free(tdb->file);
}
}
/* Remove from tdbs list */
for (i = &tdbs; *i; i = &(*i)->next) {
if (*i == tdb) {
*i = tdb->next;
break;
}
}
#ifdef TDB_TRACE
close(tdb->tracefd);
#endif
free(tdb);
return ret;
}
_PUBLIC_ void tdb_foreach_(int (*fn)(struct tdb_context *, void *), void *p)
{
struct tdb_context *i;
for (i = tdbs; i; i = i->next) {
if (fn(i, p) != 0)
break;
}
}