tree-wide: expose "p"-suffix unref calls in public APIs to make gcc cleanup easy

GLIB has recently started to officially support the gcc cleanup
attribute in its public API, hence let's do the same for our APIs.

With this patch we'll define an xyz_unrefp() call for each public
xyz_unref() call, to make it easy to use inside a
__attribute__((cleanup())) expression. Then, all code is ported over to
make use of this.

The new calls are also documented in the man pages, with examples how to
use them (well, I only added docs where the _unref() call itself already
had docs, and the examples, only cover sd_bus_unrefp() and
sd_event_unrefp()).

This also renames sd_lldp_free() to sd_lldp_unref(), since that's how we
tend to call our destructors these days.

Note that this defines no public macro that wraps gcc's attribute and
makes it easier to use. While I think it's our duty in the library to
make our stuff easy to use, I figure it's not our duty to make gcc's own
features easy to use on its own. Most likely, client code which wants to
make use of this should define its own:

       #define _cleanup_(function) __attribute__((cleanup(function)))

Or similar, to make the gcc feature easier to use.

Making this logic public has the benefit that we can remove three header
files whose only purpose was to define these functions internally.

See #2008.

1 files changed, 11 insertions, 11 deletions

diff --git a/src/machine/machined-dbus.c b/src/machine/machined-dbus.c
index 961767c4a9..49e574b6ca 100644
--- a/src/machine/machined-dbus.c
+++ b/src/machine/machined-dbus.c
@@ -203,7 +203,7 @@ static int method_get_machine_by_pid(sd_bus_message *message, void *userdata, sd
                 return -EINVAL;
 
         if (pid == 0) {
-                _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL;
+                _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
 
                 r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_PID, &creds);
                 if (r < 0)
@@ -228,7 +228,7 @@ static int method_get_machine_by_pid(sd_bus_message *message, void *userdata, sd
 }
 
 static int method_list_machines(sd_bus_message *message, void *userdata, sd_bus_error *error) {
-        _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
+        _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
         Manager *m = userdata;
         Machine *machine;
         Iterator i;
@@ -333,7 +333,7 @@ static int method_create_or_register_machine(Manager *manager, sd_bus_message *m
                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Root directory must be empty or an absolute path");
 
         if (leader == 0) {
-                _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL;
+                _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
 
                 r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_PID, &creds);
                 if (r < 0)
@@ -554,7 +554,7 @@ static int method_get_machine_os_release(sd_bus_message *message, void *userdata
 }
 
 static int method_list_images(sd_bus_message *message, void *userdata, sd_bus_error *error) {
-        _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
+        _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
         _cleanup_(image_hashmap_freep) Hashmap *images = NULL;
         Manager *m = userdata;
         Image *image;
@@ -1176,7 +1176,7 @@ int match_job_removed(sd_bus_message *message, void *userdata, sd_bus_error *err
                         if (streq(result, "done"))
                                 machine_send_create_reply(machine, NULL);
                         else {
-                                _cleanup_bus_error_free_ sd_bus_error e = SD_BUS_ERROR_NULL;
+                                _cleanup_(sd_bus_error_free) sd_bus_error e = SD_BUS_ERROR_NULL;
 
                                 sd_bus_error_setf(&e, BUS_ERROR_JOB_FAILED, "Start job for unit %s failed with '%s'", unit, result);
 
@@ -1280,7 +1280,7 @@ int manager_start_scope(
                 sd_bus_error *error,
                 char **job) {
 
-        _cleanup_bus_message_unref_ sd_bus_message *m = NULL, *reply = NULL;
+        _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL, *reply = NULL;
         int r;
 
         assert(manager);
@@ -1362,7 +1362,7 @@ int manager_start_scope(
 }
 
 int manager_stop_unit(Manager *manager, const char *unit, sd_bus_error *error, char **job) {
-        _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
+        _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
         int r;
 
         assert(manager);
@@ -1425,8 +1425,8 @@ int manager_kill_unit(Manager *manager, const char *unit, int signo, sd_bus_erro
 }
 
 int manager_unit_is_active(Manager *manager, const char *unit) {
-        _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
-        _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
+        _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
+        _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
         _cleanup_free_ char *path = NULL;
         const char *state;
         int r;
@@ -1467,8 +1467,8 @@ int manager_unit_is_active(Manager *manager, const char *unit) {
 }
 
 int manager_job_is_active(Manager *manager, const char *path) {
-        _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
-        _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
+        _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
+        _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
         int r;
 
         assert(manager);