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, 6 insertions, 6 deletions

diff --git a/src/bus-proxyd/proxy.c b/src/bus-proxyd/proxy.c
index db399b24f2..98222c50cc 100644
--- a/src/bus-proxyd/proxy.c
+++ b/src/bus-proxyd/proxy.c
@@ -49,7 +49,7 @@
 #include "util.h"
 
 static int proxy_create_destination(Proxy *p, const char *destination, const char *local_sec, bool negotiate_fds) {
-        _cleanup_bus_flush_close_unref_ sd_bus *b = NULL;
+        _cleanup_(sd_bus_flush_close_unrefp) sd_bus *b = NULL;
         int r;
 
         r = sd_bus_new(&b);
@@ -491,7 +491,7 @@ static int process_policy_unlocked(sd_bus *from, sd_bus *to, sd_bus_message *m,
                 (void) sd_bus_creds_get_egid(&m->creds, &sender_gid);
 
                 if (sender_uid == UID_INVALID || sender_gid == GID_INVALID) {
-                        _cleanup_bus_creds_unref_ sd_bus_creds *sender_creds = NULL;
+                        _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *sender_creds = NULL;
 
                         /* If the message came from another legacy
                          * client, then the message creds will be
@@ -522,7 +522,7 @@ static int process_policy_unlocked(sd_bus *from, sd_bus *to, sd_bus_message *m,
         }
 
         if (to->is_kernel) {
-                _cleanup_bus_creds_unref_ sd_bus_creds *destination_creds = NULL;
+                _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *destination_creds = NULL;
                 uid_t destination_uid = UID_INVALID;
                 gid_t destination_gid = GID_INVALID;
                 const char *destination_unique = NULL;
@@ -609,7 +609,7 @@ static int process_policy(sd_bus *from, sd_bus *to, sd_bus_message *m, SharedPol
 }
 
 static int process_hello(Proxy *p, sd_bus_message *m) {
-        _cleanup_bus_message_unref_ sd_bus_message *n = NULL;
+        _cleanup_(sd_bus_message_unrefp) sd_bus_message *n = NULL;
         bool is_hello;
         int r;
 
@@ -723,7 +723,7 @@ static int patch_sender(sd_bus *a, sd_bus_message *m) {
 }
 
 static int proxy_process_destination_to_local(Proxy *p) {
-        _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
+        _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
         bool matched, matched_synthetic;
         int r;
 
@@ -832,7 +832,7 @@ static int proxy_process_destination_to_local(Proxy *p) {
 }
 
 static int proxy_process_local_to_destination(Proxy *p) {
-        _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
+        _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
         int r;
 
         assert(p);