--- xfsprogs-4.3.0.orig/copy/xfs_copy.c	2015-10-15 23:31:26.000000000 +0200
+++ xfsprogs-4.3.0/copy/xfs_copy.c	2015-11-27 06:04:00.000000000 +0100
@@ -236,6 +236,10 @@ handler(int sig)
 {
 	pid_t	pid;
 	int	status, i;
+	struct sigaction action;
+
+	action.sa_handler = handler;
+	action.sa_flags = 0;
 
 	pid = wait(&status);
 
@@ -268,7 +272,7 @@ handler(int sig)
 					pthread_exit(NULL);
 				}
 
-				signal(SIGCHLD, handler);
+				sigaction(SIGCHLD, &action, NULL);
 				return;
 			} else  {
 				/* it just croaked it bigtime, log it */
@@ -290,7 +294,7 @@ handler(int sig)
 	do_warn(_("%s: Unknown child died (should never happen!)\n"), progname);
 	die_perror();
 	pthread_exit(NULL);
-	signal(SIGCHLD, handler);
+	sigaction(SIGCHLD, &action, NULL);
 }
 
 void
@@ -466,6 +470,11 @@ void
 write_wbuf(void)
 {
 	int		i;
+	sigset_t        unblock, initial;
+
+	sigemptyset(&unblock);
+	sigaddset(&unblock, SIGCHLD);
+
 
 	/* verify target threads */
 	for (i = 0; i < num_targets; i++)
@@ -477,9 +486,9 @@ write_wbuf(void)
 		if (target[i].state != INACTIVE)
 			pthread_mutex_unlock(&targ[i].wait);	/* wake up */
 
-	sigrelse(SIGCHLD);
+	sigprocmask(SIG_UNBLOCK, &unblock, &initial);
 	pthread_mutex_lock(&mainwait);
-	sighold(SIGCHLD);
+	sigprocmask(SIG_SETMASK, &initial, NULL);
 }
 
 void
@@ -551,6 +560,12 @@ main(int argc, char **argv)
 	libxfs_init_t	xargs;
 	thread_args	*tcarg;
 	struct stat64	statbuf;
+	struct sigaction saction;
+	sigset_t        sigblock, initial;
+
+	saction.sa_handler = handler;
+	saction.sa_flags = 0;
+
 
 	progname = basename(argv[0]);
 
@@ -892,8 +907,11 @@ main(int argc, char **argv)
 
 	/* set up sigchild signal handler */
 
-	signal(SIGCHLD, handler);
-	sighold(SIGCHLD);
+	sigaction(SIGCHLD, &saction, NULL);
+	sigemptyset(&sigblock);
+	sigaddset(&sigblock, SIGCHLD);
+	sigprocmask(SIG_BLOCK, &sigblock, &initial);
+
 
 	/* make children */