On Fri, Mar 11, 2011 at 11:00 PM, Anthony Liguori<address@hidden> wrote:
The Error class is similar to QError (now deprecated) except that it supports
propagation. This allows for higher quality error handling. It's losely
modeled after glib style GErrors.
Signed-off-by: Anthony Liguori<address@hidden>
diff --git a/Makefile.objs b/Makefile.objs
index 0ba02c7..da31530 100644
--- a/Makefile.objs
+++ b/Makefile.objs
@@ -15,6 +15,7 @@ oslib-obj-$(CONFIG_POSIX) += oslib-posix.o
block-obj-y = cutils.o cache-utils.o qemu-malloc.o qemu-option.o module.o
block-obj-y += nbd.o block.o aio.o aes.o qemu-config.o
+block-obj-y += error.o
block-obj-$(CONFIG_POSIX) += posix-aio-compat.o
block-obj-$(CONFIG_LINUX_AIO) += linux-aio.o
diff --git a/error.c b/error.c
new file mode 100644
index 0000000..5d84106
--- /dev/null
+++ b/error.c
@@ -0,0 +1,122 @@
+/*
+ * QEMU Error Objects
+ *
+ * Copyright IBM, Corp. 2011
+ *
+ * Authors:
+ * Anthony Liguori<address@hidden>
+ *
+ * This work is licensed under the terms of the GNU LGPL, version 2. See
+ * the COPYING.LIB file in the top-level directory.
+ */
+#include "error.h"
+#include "error_int.h"
+#include "qemu-objects.h"
+#include "qerror.h"
+#include<assert.h>
+
+struct Error
+{
+ QDict *obj;
+ const char *fmt;
+ char *msg;
+};
+
+void error_set(Error **errp, const char *fmt, ...)
+{
+ Error *err;
+ va_list ap;
+
+ if (errp == NULL) {
+ return;
+ }
+
+ err = qemu_mallocz(sizeof(*err));
+
+ va_start(ap, fmt);
+ err->obj = qobject_to_qdict(qobject_from_jsonv(fmt,&ap));
+ va_end(ap);
+ err->fmt = fmt;
+
+ *errp = err;
+}
+
+bool error_is_set(Error **errp)
+{
+ return (errp&& *errp);
+}
+
+const char *error_get_pretty(Error *err)
+{
+ if (err->msg == NULL) {
+ QString *str;
+ str = qerror_format(err->fmt, err->obj);
+ err->msg = qemu_strdup(qstring_get_str(str));
+ }
+
+ return err->msg;
+}
+
+const char *error_get_field(Error *err, const char *field)
+{
+ if (strcmp(field, "class") == 0) {
+ return qdict_get_str(err->obj, field);
+ } else {
+ QDict *dict = qdict_get_qdict(err->obj, "data");
+ return qdict_get_str(dict, field);
+ }
+}
+
+void error_free(Error *err)
+{
+ QDECREF(err->obj);
+ qemu_free(err->msg);
+ qemu_free(err);
+}
+
+bool error_is_type(Error *err, const char *fmt)
+{
+ char *ptr;
+ char *end;
+ char classname[1024];
+
+ ptr = strstr(fmt, "'class': '");
+ assert(ptr != NULL);
+ ptr += strlen("'class': '");
+
+ end = strchr(ptr, '\'');
+ assert(end != NULL);
+
+ memcpy(classname, ptr, (end - ptr));
+ classname[(end - ptr)] = 0;
+
+ return strcmp(classname, error_get_field(err, "class")) == 0;
+}
+
+void error_propagate(Error **dst_err, Error *local_err)
+{
+ if (dst_err) {
+ *dst_err = local_err;
+ } else if (local_err) {
+ error_free(local_err);
+ }
+}
+
+QObject *error_get_qobject(Error *err)
+{
+ QINCREF(err->obj);
+ return QOBJECT(err->obj);
+}
+
+void error_set_qobject(Error **errp, QObject *obj)
+{
+ Error *err;
+ if (errp == NULL) {
+ return;
+ }
+ err = qemu_mallocz(sizeof(*err));
+ err->obj = qobject_to_qdict(obj);
+ qobject_incref(obj);
+
+ *errp = err;
+}
diff --git a/error.h b/error.h
new file mode 100644
The name is too generic, it could conflict with system headers. At
least I have /usr/include/error.h.
index 0000000..317d487
--- /dev/null
+++ b/error.h
@@ -0,0 +1,65 @@
+/*
+ * QEMU Error Objects
+ *
+ * Copyright IBM, Corp. 2011
+ *
+ * Authors:
+ * Anthony Liguori<address@hidden>
+ *
+ * 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
This #define could also conflict with system headers. In my system,
_ERROR_H is used, but who knows all error.h files out there?