sd-bus: port one use of SO_PEERCRED by getpeercred()

diff --git a/src/shared/bus-util.c b/src/shared/bus-util.c
index a4e0ec1053490b7330d275d0b66a3aaf998f5d7e..eb953b9bb34eb272e8fae12270622a6f83e6b1d0 100644 (file)
--- a/src/shared/bus-util.c
+++ b/src/shared/bus-util.c
@@ -563,8 +563,7 @@ void bus_verify_polkit_async_registry_free(Hashmap *registry) {
 #if 0 /// UNNEEDED by elogind
 int bus_check_peercred(sd_bus *c) {
         struct ucred ucred;
-        socklen_t l;
-        int fd;
+        int fd, r;
 
         assert(c);
 
@@ -572,12 +571,9 @@ int bus_check_peercred(sd_bus *c) {
         if (fd < 0)
                 return fd;
 
-        l = sizeof(struct ucred);
-        if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &ucred, &l) < 0)
-                return -errno;
-
-        if (l != sizeof(struct ucred))
-                return -E2BIG;
+        r = getpeercred(fd, &ucred);
+        if (r < 0)
+                return r;
 
         if (ucred.uid != 0 && ucred.uid != geteuid())
                 return -EPERM;