include/qapi/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 "qemu/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  * Set an indirect pointer to an error given a ErrorClass value and a
  34  * printf-style human message, followed by a strerror() string if
  35  * @os_error is not zero.
  36  */
  37 void error_set_errno(Error **err, int os_error, ErrorClass err_class, const char *fmt, ...) GCC_FMT_ATTR(4, 5);
  38
  39 /**
  40  * Same as error_set(), but sets a generic error
  41  */
  42 #define error_setg(err, fmt, ...) \
  43     error_set(err, ERROR_CLASS_GENERIC_ERROR, fmt, ## __VA_ARGS__)
  44 #define error_setg_errno(err, os_error, fmt, ...) \
  45     error_set_errno(err, os_error, ERROR_CLASS_GENERIC_ERROR, fmt, ## __VA_ARGS__)
  46
  47 /**
  48  * Helper for open() errors
  49  */
  50 void error_setg_file_open(Error **errp, int os_errno, const char *filename);
  51
  52 /**
  53  * Returns true if an indirect pointer to an error is pointing to a valid
  54  * error object.
  55  */
  56 bool error_is_set(Error **err);
  57
  58 /*
  59  * Get the error class of an error object.
  60  */
  61 ErrorClass error_get_class(const Error *err);
  62
  63 /**
  64  * Returns an exact copy of the error passed as an argument.
  65  */
  66 Error *error_copy(const Error *err);
  67
  68 /**
  69  * Get a human readable representation of an error object.
  70  */
  71 const char *error_get_pretty(Error *err);
  72
  73 /**
  74  * Propagate an error to an indirect pointer to an error.  This function will
  75  * always transfer ownership of the error reference and handles the case where
  76  * dst_err is NULL correctly.  Errors after the first are discarded.
  77  */
  78 void error_propagate(Error **dst_err, Error *local_err);
  79
  80 /**
  81  * Free an error object.
  82  */
  83 void error_free(Error *err);
  84
  85 #endif