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<title>Berkeley DB: DB_ENV->set_errfile</title>
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<h1>DB_ENV->set_errfile</h1>
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DB_ENV->set_errfile(DB_ENV *dbenv, FILE *errfile);
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When an error occurs in the Berkeley DB library, a Berkeley DB error or an error
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return value is returned by the function. In some cases, however,
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the <b>errno</b> value may be insufficient to completely describe
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the cause of the error especially during initial application debugging.
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<p>The DB_ENV->set_errfile and <a href="../api_c/db_set_errfile.html">DB->set_errfile</a> methods are used to
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enhance the mechanism for reporting error messages to the application
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by setting a C library FILE * to be used for displaying additional Berkeley DB
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error messages. In some cases, when an error occurs, Berkeley DB will output
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an additional error message to the specified file reference.
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<p>The error message will consist of the prefix string and a colon
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("<b>:</b>") (if a prefix string was previously specified using
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<a href="../api_c/db_set_errpfx.html">DB->set_errpfx</a> or <a href="../api_c/env_set_errpfx.html">DB_ENV->set_errpfx</a>), an error string, and
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a trailing <newline> character.
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<p>This error logging enhancement does not slow performance or significantly
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increase application size, and may be run during normal operation as well
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as during application debugging.
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<p>The DB_ENV->set_errfile interface may be called at any time during the life of
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<a href="../api_c/env_class.html">DB_ENV</a>
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<a href="../api_c/env_list.html">Database Environments and Related Methods</a>
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