error.h

   1 /*
   2  * QEMU Error Objects
   3  *
   4  * Copyright IBM, Corp. 2011
   5  *
   6  * Authors:
   7  *  Anthony Liguori   <aliguori@us.ibm.com>
   8  *
   9  * This work is licensed under the terms of the GNU LGPL, version 2.  See
  10  * the COPYING.LIB file in the top-level directory.
  11  */
  12 #ifndef ERROR_H
  13 #define ERROR_H
  14
  15 #include "compiler.h"
  16 #include "qapi-types.h"
  17 #include <stdbool.h>
  18
  19 /**
  20  * A class representing internal errors within QEMU.  An error has a ErrorClass
  21  * code and a human message.
  22  */
  23 typedef struct Error Error;
  24
  25 /**
  26  * Set an indirect pointer to an error given a ErrorClass value and a
  27  * printf-style human message.  This function is not meant to be used outside
  28  * of QEMU.
  29  */
  30 void error_set(Error **err, ErrorClass err_class, const char *fmt, ...) GCC_FMT_ATTR(3, 4);
  31
  32 /**
  33  * Same as error_set(), but sets a generic error
  34  */
  35 #define error_setg(err, fmt, ...) \
  36     error_set(err, ERROR_CLASS_GENERIC_ERROR, fmt, ## __VA_ARGS__)
  37
  38 /**
  39  * Returns true if an indirect pointer to an error is pointing to a valid
  40  * error object.
  41  */
  42 bool error_is_set(Error **err);
  43
  44 /*
  45  * Get the error class of an error object.
  46  */
  47 ErrorClass error_get_class(const Error *err);
  48
  49 /**
  50  * Returns an exact copy of the error passed as an argument.
  51  */
  52 Error *error_copy(const Error *err);
  53
  54 /**
  55  * Get a human readable representation of an error object.
  56  */
  57 const char *error_get_pretty(Error *err);
  58
  59 /**
  60  * Propagate an error to an indirect pointer to an error.  This function will
  61  * always transfer ownership of the error reference and handles the case where
  62  * dst_err is NULL correctly.  Errors after the first are discarded.
  63  */
  64 void error_propagate(Error **dst_err, Error *local_err);
  65
  66 /**
  67  * Free an error object.
  68  */
  69 void error_free(Error *err);
  70
  71 #endif