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gresolver: Document that GResolver lists are non-empty on success

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The documentation previously wasn’t clear about whether the GResolver
methods could return an empty list and no error. On balance, this seems
like a bad idea, and GResolver should commit to always return a
non-empty list, or an error (which should be G_RESOLVER_ERROR_NOT_FOUND
if the list would otherwise be empty).

https://bugzilla.gnome.org/show_bug.cgi?id=728776
This commit is contained in:
Philip Withnall 2014-04-24 09:24:48 +01:00
parent 5dedf6927f
commit 4841dc2b8b
1 changed files with 24 additions and 19 deletions
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43
gio/gresolver.c
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@ -336,7 +336,7 @@ handle_ip_address (const char *hostname,
* the textual form of an IP address (in which case this just becomes
* a wrapper around g_inet_address_new_from_string()).
*
* On success, g_resolver_lookup_by_name() will return a #GList of
* On success, g_resolver_lookup_by_name() will return a non-empty #GList of
* #GInetAddress, sorted in order of preference and guaranteed to not
* contain duplicates. That is, if using the result to connect to
* @hostname, you should attempt to connect to the first address
@ -345,7 +345,7 @@ handle_ip_address (const char *hostname,
* result using e.g. g_socket_listener_add_address().
*
* If the DNS resolution fails, @error (if non-%NULL) will be set to a
* value from #GResolverError.
* value from #GResolverError and %NULL will be returned.
*
* If @cancellable is non-%NULL, it can be used to cancel the
* operation, in which case @error (if non-%NULL) will be set to
@ -355,7 +355,7 @@ handle_ip_address (const char *hostname,
* address, it may be easier to create a #GNetworkAddress and use its
* #GSocketConnectable interface.
*
* Returns: (element-type GInetAddress) (transfer full): a #GList
* Returns: (element-type GInetAddress) (transfer full): a non-empty #GList
* of #GInetAddress, or %NULL on error. You
* must unref each of the addresses and free the list when you are
* done with it. (You can use g_resolver_free_addresses() to do this.)
@ -638,13 +638,13 @@ g_resolver_get_service_rrname (const char *service,
* @service and @protocol arguments do not include the leading underscore
* that appears in the actual DNS entry.
*
* On success, g_resolver_lookup_service() will return a #GList of
* On success, g_resolver_lookup_service() will return a non-empty #GList of
* #GSrvTarget, sorted in order of preference. (That is, you should
* attempt to connect to the first target first, then the second if
* the first fails, etc.)
*
* If the DNS resolution fails, @error (if non-%NULL) will be set to
* a value from #GResolverError.
* a value from #GResolverError and %NULL will be returned.
*
* If @cancellable is non-%NULL, it can be used to cancel the
* operation, in which case @error (if non-%NULL) will be set to
@ -654,9 +654,10 @@ g_resolver_get_service_rrname (const char *service,
* to create a #GNetworkService and use its #GSocketConnectable
* interface.
*
* Returns: (element-type GSrvTarget) (transfer full): a #GList of #GSrvTarget,
* or %NULL on error. You must free each of the targets and the list when you are
* done with it. (You can use g_resolver_free_targets() to do this.)
* Returns: (element-type GSrvTarget) (transfer full): a non-empty #GList of
* #GSrvTarget, or %NULL on error. You must free each of the targets and the
* list when you are done with it. (You can use g_resolver_free_targets() to do
* this.)
*
* Since: 2.22
*/
@ -742,8 +743,9 @@ g_resolver_lookup_service_async (GResolver *resolver,
* a value from #GResolverError. If the operation was cancelled,
* @error will be set to %G_IO_ERROR_CANCELLED.
*
* Returns: (element-type GSrvTarget) (transfer full): a #GList of #GSrvTarget,
* or %NULL on error. See g_resolver_lookup_service() for more details.
* Returns: (element-type GSrvTarget) (transfer full): a non-empty #GList of
* #GSrvTarget, or %NULL on error. See g_resolver_lookup_service() for more
* details.
*
* Since: 2.22
*/
@ -795,15 +797,16 @@ g_resolver_free_targets (GList *targets)
* information on what the records contain for each @record_type.
*
* If the DNS resolution fails, @error (if non-%NULL) will be set to
* a value from #GResolverError.
* a value from #GResolverError and %NULL will be returned.
*
* If @cancellable is non-%NULL, it can be used to cancel the
* operation, in which case @error (if non-%NULL) will be set to
* %G_IO_ERROR_CANCELLED.
*
* Returns: (element-type GVariant) (transfer full): a #GList of #GVariant,
* or %NULL on error. You must free each of the records and the list when you are
* done with it. (You can use g_list_free_full() with g_variant_unref() to do this.)
* Returns: (element-type GVariant) (transfer full): a non-empty #GList of
* #GVariant, or %NULL on error. You must free each of the records and the list
* when you are done with it. (You can use g_list_free_full() with
* g_variant_unref() to do this.)
*
* Since: 2.34
*/
@ -865,16 +868,18 @@ g_resolver_lookup_records_async (GResolver *resolver,
* @error: return location for a #GError, or %NULL
*
* Retrieves the result of a previous call to
* g_resolver_lookup_records_async(). Returns a list of records as #GVariant
* tuples. See #GResolverRecordType for information on what the records contain.
* g_resolver_lookup_records_async(). Returns a non-empty list of records as
* #GVariant tuples. See #GResolverRecordType for information on what the
* records contain.
*
* If the DNS resolution failed, @error (if non-%NULL) will be set to
* a value from #GResolverError. If the operation was cancelled,
* @error will be set to %G_IO_ERROR_CANCELLED.
*
* Returns: (element-type GVariant) (transfer full): a #GList of #GVariant,
* or %NULL on error. You must free each of the records and the list when you are
* done with it. (You can use g_list_free_full() with g_variant_unref() to do this.)
* Returns: (element-type GVariant) (transfer full): a non-empty #GList of
* #GVariant, or %NULL on error. You must free each of the records and the list
* when you are done with it. (You can use g_list_free_full() with
* g_variant_unref() to do this.)
*
* Since: 2.34
*/