X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=src%2Fshared%2Faudit.c;h=4701c0a8de856548d1eb7b8e0d31dd9304636872;hb=f9aa5413807e163df49171793eb93a230cd7b955;hp=546644773720934a18412394fb7d3687567eed3e;hpb=db999e0f923ca6c2c1b919d0f1c916472f209e62;p=elogind.git

diff --git a/src/shared/audit.c b/src/shared/audit.c
index 546644773..4701c0a8d 100644
--- a/src/shared/audit.c
+++ b/src/shared/audit.c
@@ -77,9 +77,24 @@ int audit_loginuid_from_pid(pid_t pid, uid_t *uid) {
         if (r < 0)
                 return r;
 
-        if (u == (uid_t) -1)
-                return -ENXIO;
-
         *uid = (uid_t) u;
         return 0;
 }
+
+bool use_audit(void) {
+        static int cached_use = -1;
+
+        if (cached_use < 0) {
+                int fd;
+
+                fd = socket(AF_NETLINK, SOCK_RAW|SOCK_CLOEXEC|SOCK_NONBLOCK, NETLINK_AUDIT);
+                if (fd < 0)
+                        cached_use = errno != EAFNOSUPPORT && errno != EPROTONOSUPPORT;
+                else {
+                        cached_use = true;
+                        safe_close(fd);
+                }
+        }
+
+        return cached_use;
+}