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<! "@(#)id.so 10.7 (Sleepycat) 9/29/98">
<!Copyright 1997, 1998 by Sleepycat Software, Inc. All rights reserved.>
<html>
<body bgcolor=white>
<head>
<title>Berkeley DB: lock_id</title>
<meta name="description" content="Berkeley DB: An embedded database programmatic toolkit.">
<meta name="keywords" content="embedded,database,programmatic,toolkit,b+tree,btr
ee,hash,hashing,transaction,transactions,locking,logging,access method,access me
thods,java,C,C++">
</head>
<h1>lock_id</h1>
<hr size=1 noshade>
<tt>
<h3>
<pre>
#include <db.h>
<p>
int
lock_id(DB_LOCKTAB *lt, u_int32_t *idp);
</pre>
</h3>
<h1>Description</h1>
<p>
The lock_id function
copies a locker ID, which is guaranteed to be unique in the specified lock
table, into the memory location referenced by <b>idp</b>.
<p>
The Berkeley DB access methods generate a unique locker ID for each file that
is opened with locking. During Berkeley DB access method operation, this locker
ID will be used for all lock calls unless a transaction identifier was
specified for the call, in which case the transaction ID specified is used
as the locker ID.
<p>
The lock_id
function returns the value of <b>errno</b> on failure, and 0 on success.
<p>
<h1>Errors</h1>
If a fatal error occurs in Berkeley DB, the lock_id function may fail and return
DB_RUNRECOVERY, at which point all subsequent database calls will also
return DB_RUNRECOVERY.
<p>
The lock_id
function may fail and return <b>errno</b>
for any of the errors specified for the following Berkeley DB and C library
functions:
abort(3),
fcntl(3),
fprintf(3),
and
getpid(3).
<p>
<h1>See Also</h1>
<a href="../../api_c/DbLockTab/close.html">lock_close</a>,
<a href="../../api_c/DbLockTab/detect.html">lock_detect</a>,
<a href="../../api_c/DbLockTab/get.html">lock_get</a>,
lock_id,
<a href="../../api_c/DbLockTab/open.html">lock_open</a>,
<a href="../../api_c/DbLock/put.html">lock_put</a>,
<a href="../../api_c/DbLockTab/stat.html">lock_stat</a>,
<a href="../../api_c/DbLockTab/unlink.html">lock_unlink</a>
and
<a href="../../api_c/DbLockTab/vec.html">lock_vec</a>.
</tt>
</body>
</html>
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