DB->err

API Ref

#include <db.h>

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

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


Description: DB->err

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

The DB_ENV->err method 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 method, any prefix string specified using the DB_ENV->set_errpfx method, 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 parameters 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 method.

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

Parameters

error
The error parameter is the error value for which the DB_ENV->err and DB->err methods will display a explanatory string.

fmt
The fmt parameter is an optional printf-style message to display.

Class

DB

See Also

Databases and Related Methods

APIRef

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