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  * Returns true if an indirect pointer to an error is pointing to a valid
  34  * error object.
  35  */
  36 bool error_is_set(Error **err);
  37
  38 /*
  39  * Get the error class of an error object.
  40  */
  41 ErrorClass error_get_class(const Error *err);
  42
  43 /**
  44  * Returns an exact copy of the error passed as an argument.
  45  */
  46 Error *error_copy(const Error *err);
  47
  48 /**
  49  * Get a human readable representation of an error object.
  50  */
  51 const char *error_get_pretty(Error *err);
  52
  53 /**
  54  * Propagate an error to an indirect pointer to an error.  This function will
  55  * always transfer ownership of the error reference and handles the case where
  56  * dst_err is NULL correctly.  Errors after the first are discarded.
  57  */
  58 void error_propagate(Error **dst_err, Error *local_err);
  59
  60 /**
  61  * Free an error object.
  62  */
  63 void error_free(Error *err);
  64
  65 #endif