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<!--$Id: env_err.so,v 10.34 2006/04/27 20:17:47 bostic Exp $--> <!--Copyright (c) 1997,2008 Oracle. All rights reserved.--> <!--See the file LICENSE for redistribution information.--> <html> <head> <title>Berkeley DB: DB_ENV->err</title> <meta name="description" content="Berkeley DB: An embedded database programmatic toolkit."> <meta name="keywords" content="embedded,database,programmatic,toolkit,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,Java,C,C++"> </head> <body bgcolor=white> <table width="100%"><tr valign=top> <td> <b>DB_ENV->err</b> </td> <td align=right> <a href="../../db4-devel-4.7.25/api_c/api_core.html"><img src="../../db4-devel-4.7.25/images/api.gif" alt="API"></a> <a href="../../db4-devel-4.7.25/ref/toc.html"><img src="../../db4-devel-4.7.25/images/ref.gif" alt="Ref"></a></td> </tr></table> <hr size=1 noshade> <tt> <b><pre> #include <db.h> <p> void DB_ENV->err(DB_ENV *dbenv, int error, const char *fmt, ...); <p> void DB_ENV->errx(DB_ENV *dbenv, const char *fmt, ...); </pre></b> <hr size=1 noshade> <b>Description: DB_ENV->err</b> <p>The DB_ENV->err, DB_ENV->errx, <a href="../../db4-devel-4.7.25/api_c/db_err.html">DB->err</a> and <a href="../../db4-devel-4.7.25/api_c/db_err.html">DB->errx</a> methods provide error-messaging functionality for applications written using the Berkeley DB library.</p> <p>The <a href="../../db4-devel-4.7.25/api_c/db_err.html">DB->err</a> and DB_ENV->err methods constructs an error message consisting of the following elements:</p> <blockquote><br> <b>An optional prefix string</b><ul compact><li>If no error callback function has been set using the <a href="../../db4-devel-4.7.25/api_c/env_set_errcall.html">DB_ENV->set_errcall</a> method, any prefix string specified using the <a href="../../db4-devel-4.7.25/api_c/env_set_errpfx.html">DB_ENV->set_errpfx</a> method, followed by two separating characters: a colon and a <space> character.</ul> <b>An optional printf-style message</b><ul compact><li>The supplied message <b>fmt</b>, if non-NULL, in which the ANSI C X3.159-1989 (ANSI C) printf function specifies how subsequent parameters are converted for output.</ul> <b>A separator</b><ul compact><li>Two separating characters: a colon and a <space> character.</ul> <b>A standard error string</b><ul compact><li>The standard system or Berkeley DB library error string associated with the <b>error</b> value, as returned by the <a href="../../db4-devel-4.7.25/api_c/env_strerror.html">db_strerror</a> method.</ul> <br> </blockquote> <p>The <a href="../../db4-devel-4.7.25/api_c/db_err.html">DB->errx</a> and DB_ENV->errx methods are the same as the <a href="../../db4-devel-4.7.25/api_c/db_err.html">DB->err</a> and DB_ENV->err methods, except they do not append the final separator characters and standard error string to the error message.</p> <p>This constructed error message is then handled as follows:</p> <blockquote><p>If an error callback function has been set (see <a href="../../db4-devel-4.7.25/api_c/db_set_errcall.html">DB->set_errcall</a> and <a href="../../db4-devel-4.7.25/api_c/env_set_errcall.html">DB_ENV->set_errcall</a>), that function is called with two parameters: any prefix string specified (see <a href="../../db4-devel-4.7.25/api_c/db_set_errpfx.html">DB->set_errpfx</a> and <a href="../../db4-devel-4.7.25/api_c/env_set_errpfx.html">DB_ENV->set_errpfx</a>) and the error message.</p> <p>If a C library FILE * has been set (see <a href="../../db4-devel-4.7.25/api_c/db_set_errfile.html">DB->set_errfile</a> and <a href="../../db4-devel-4.7.25/api_c/env_set_errfile.html">DB_ENV->set_errfile</a>), the error message is written to that output stream.</p> <p>If none of these output options has been configured, the error message is written to stderr, the standard error output stream.</p></blockquote> <b>Parameters</b> <br> <b>error</b><ul compact><li>The <b>error</b> parameter is the error value for which the DB_ENV->err and <a href="../../db4-devel-4.7.25/api_c/db_err.html">DB->err</a> methods will display a explanatory string.</ul> <b>fmt</b><ul compact><li>The <b>fmt</b> parameter is an optional printf-style message to display.</ul> <br> <hr size=1 noshade> <br><b>Class</b> <a href="../../db4-devel-4.7.25/api_c/env_class.html">DB_ENV</a> <br><b>See Also</b> <a href="../../db4-devel-4.7.25/api_c/env_list.html">Database Environments and Related Methods</a> </tt> <table width="100%"><tr><td><br></td><td align=right> <a href="../../db4-devel-4.7.25/api_c/api_core.html"><img src="../../db4-devel-4.7.25/images/api.gif" alt="API"></a><a href="../../db4-devel-4.7.25/ref/toc.html"><img src="../../db4-devel-4.7.25/images/ref.gif" alt="Ref"></a> </td></tr></table> <p><font size=1>Copyright (c) 1996,2008 Oracle. All rights reserved.</font> </body> </html>
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