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/*
* QEMU Error Objects
*
* Copyright IBM, Corp. 2011
*
* Authors:
* Anthony Liguori <aliguori@us.ibm.com>
*
* This work is licensed under the terms of the GNU LGPL, version 2. See
* the COPYING.LIB file in the top-level directory.
*/
#ifndef ERROR_H
#define ERROR_H
#include "compiler.h"
#include "qapi-types.h"
#include <stdbool.h>
/**
* A class representing internal errors within QEMU. An error has a ErrorClass
* code and a human message.
*/
typedef struct Error Error;
/**
* Set an indirect pointer to an error given a ErrorClass value and a
* printf-style human message. This function is not meant to be used outside
* of QEMU.
*/
void error_set(Error **err, ErrorClass err_class, const char *fmt, ...) GCC_FMT_ATTR(3, 4);
/**
* Set an indirect pointer to an error given a ErrorClass value and a
* printf-style human message, followed by a strerror() string if
* @os_error is not zero.
*/
void error_set_errno(Error **err, int os_error, ErrorClass err_class, const char *fmt, ...) GCC_FMT_ATTR(4, 5);
/**
* Same as error_set(), but sets a generic error
*/
#define error_setg(err, fmt, ...) \
error_set(err, ERROR_CLASS_GENERIC_ERROR, fmt, ## __VA_ARGS__)
#define error_setg_errno(err, os_error, fmt, ...) \
error_set_errno(err, os_error, ERROR_CLASS_GENERIC_ERROR, fmt, ## __VA_ARGS__)
/**
* Returns true if an indirect pointer to an error is pointing to a valid
* error object.
*/
bool error_is_set(Error **err);
/*
* Get the error class of an error object.
*/
ErrorClass error_get_class(const Error *err);
/**
* Returns an exact copy of the error passed as an argument.
*/
Error *error_copy(const Error *err);
/**
* Get a human readable representation of an error object.
*/
const char *error_get_pretty(Error *err);
/**
* Propagate an error to an indirect pointer to an error. This function will
* always transfer ownership of the error reference and handles the case where
* dst_err is NULL correctly. Errors after the first are discarded.
*/
void error_propagate(Error **dst_err, Error *local_err);
/**
* Free an error object.
*/
void error_free(Error *err);
#endif
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