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error: Document how to accumulate multiple errors

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Suggested-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <1447776349-2344-1-git-send-email-armbru@redhat.com>
This commit is contained in:
Markus Armbruster 2015-11-17 17:05:49 +01:00
parent 649a1bbaf9
commit 8d780f4392
1 changed files with 17 additions and 0 deletions
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17
include/qapi/error.h
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@ -76,6 +76,23 @@
* But when all you do with the error is pass it on, please use
* foo(arg, errp);
* for readability.
*
* Receive and accumulate multiple errors (first one wins):
* Error *err = NULL, *local_err = NULL;
* foo(arg, &err);
* bar(arg, &local_err);
* error_propagate(&err, local_err);
* if (err) {
* handle the error...
* }
*
* Do *not* "optimize" this to
* foo(arg, &err);
* bar(arg, &err); // WRONG!
* if (err) {
* handle the error...
* }
* because this may pass a non-null err to bar().
*/
#ifndef ERROR_H