error.c

   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
  13 #include "qemu-common.h"
  14 #include "error.h"
  15 #include "qjson.h"
  16 #include "qdict.h"
  17 #include "qapi-types.h"
  18 #include "qerror.h"
  19
  20 struct Error
  21 {
  22     QDict *obj;
  23     char *msg;
  24     ErrorClass err_class;
  25 };
  26
  27 void error_set(Error **errp, ErrorClass err_class, const char *fmt, ...)
  28 {
  29     Error *err;
  30     va_list ap;
  31
  32     if (errp == NULL) {
  33         return;
  34     }
  35     assert(*errp == NULL);
  36
  37     err = g_malloc0(sizeof(*err));
  38
  39     va_start(ap, fmt);
  40     err->obj = qobject_to_qdict(qobject_from_jsonv(fmt, &ap));
  41     va_end(ap);
  42     err->msg = qerror_format(fmt, err->obj);
  43     err->err_class = err_class;
  44
  45     *errp = err;
  46 }
  47
  48 Error *error_copy(const Error *err)
  49 {
  50     Error *err_new;
  51
  52     err_new = g_malloc0(sizeof(*err));
  53     err_new->msg = g_strdup(err->msg);
  54     err_new->err_class = err->err_class;
  55     err_new->obj = err->obj;
  56     QINCREF(err_new->obj);
  57
  58     return err_new;
  59 }
  60
  61 bool error_is_set(Error **errp)
  62 {
  63     return (errp && *errp);
  64 }
  65
  66 ErrorClass error_get_class(const Error *err)
  67 {
  68     return err->err_class;
  69 }
  70
  71 const char *error_get_pretty(Error *err)
  72 {
  73     return err->msg;
  74 }
  75
  76 void error_free(Error *err)
  77 {
  78     if (err) {
  79         QDECREF(err->obj);
  80         g_free(err->msg);
  81         g_free(err);
  82     }
  83 }
  84
  85 void error_propagate(Error **dst_err, Error *local_err)
  86 {
  87     if (dst_err && !*dst_err) {
  88         *dst_err = local_err;
  89     } else if (local_err) {
  90         error_free(local_err);
  91     }
  92 }