# DB->err |

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    #include <db.h>

    void
    DB->err(DB *db, int error, const char *fmt, ...);

    void
    DB->errx(DB *db, const char *fmt, ...);

# Description

The DB_ENV->err, DB_ENV->errx, DB->err and DB->errx functions provide error-messaging functionality for applications written using the Berkeley DB library.

The DB_ENV->err function constructs an error message consisting of the following elements:

> An optional prefix string
>   If no error callback function has been set using the DB_ENV->set_errcall function, any prefix string specified using the DB_ENV->set_errpfx function, followed by two separating characters: a colon and a <space> character.

> An optional printf-style message
>   The supplied message fmt, if non-NULL, in which the ANSI C X3.159-1989 (ANSI C) printf function specifies how subsequent arguments are converted for output.

> A separator
>   Two separating characters: a colon and a <space> character.

> A standard error string
>   The standard system or Berkeley DB library error string associated with the error value, as returned by the db_strerror function.

This constructed error message is then handled as follows:

> If an error callback function has been set (see DB->set_errcall and DB_ENV->set_errcall), that function is called with two arguments: any prefix string specified (see DB->set_errpfx and DB_ENV->set_errpfx) and the error message.

> If a C library FILE * has been set (see DB->set_errfile and DB_ENV->set_errfile), the error message is written to that output stream.

> If none of these output options has been configured, the error message is written to stderr, the standard error output stream.

The DB_ENV->errx and DB->errx functions perform identically to the DB_ENV->err and DB->err functions, except that they do not append the final separator characters and standard error string to the error message.

# See Also

db_create, DB->associate, DB->close, DB->cursor, DB->del, DB->err, DB->errx DB->fd, DB->get, DB->pget, DB->get_byteswapped, DB->get_type, DB->join, DB->key_range, DB->open, DB->put, DB->remove, DB->rename, DB->set_alloc, DB->set_append_recno, DB->set_bt_compare, DB->set_bt_minkey, DB->set_bt_prefix, DB->set_cachesize, DB->set_dup_compare, DB->set_errcall, DB->set_errfile, DB->set_errpfx, DB->set_feedback, DB->set_flags, DB->set_h_ffactor, DB->set_h_hash, DB->set_h_nelem, DB->set_lorder, DB->set_pagesize, DB->set_paniccall, DB->set_q_extentsize, DB->set_re_delim, DB->set_re_len, DB->set_re_pad, DB->set_re_source, DB->stat, DB->sync, DB->truncate, DB->upgrade, and DB->verify.`

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