Make sure signal used by 'dnotify' is not blocked.

Some desktop environments block all realtime signals
and they remain blocked for all child processes.
So if you run rpc.gssd from a terminal window, the
signal it used for dnotify is blocked and never
deliverred.  So it doesn't work.

So we unblock that signal.

bnc#406832

Signed-off-by: NeilBrown <neilb@suse.de>


Index: nfs-utils-1.1.3/utils/gssd/gssd_main_loop.c
===================================================================
--- nfs-utils-1.1.3.orig/utils/gssd/gssd_main_loop.c
+++ nfs-utils-1.1.3/utils/gssd/gssd_main_loop.c
@@ -99,6 +99,7 @@ gssd_run()
 	int			ret;
 	struct sigaction	dn_act;
 	int			fd;
+	sigset_t		set;
 
 	/* Taken from linux/Documentation/dnotify.txt: */
 	dn_act.sa_sigaction = dir_notify_handler;
@@ -106,6 +107,11 @@ gssd_run()
 	dn_act.sa_flags = SA_SIGINFO;
 	sigaction(DNOTIFY_SIGNAL, &dn_act, NULL);
 
+	/* just in case the signal is blocked... */
+	sigemptyset(&set);
+	sigaddset(&set, DNOTIFY_SIGNAL);
+	sigprocmask(SIG_UNBLOCK, &set, NULL);
+
 	if ((fd = open(pipefs_nfsdir, O_RDONLY)) == -1) {
 		printerr(0, "ERROR: failed to open %s: %s\n",
 			 pipefs_nfsdir, strerror(errno));