Return 0 on success and -1 on error.

sysdeps/freebsd/procsignal.c

@@ -43,6 +43,8 @@ int
 glibtop_init_proc_signal_p (glibtop *server)
 {
 	server->sysdeps.proc_signal = _glibtop_sysdeps_proc_signal;
+
+	return 0;
 }
 
 int
@@ -58,13 +60,13 @@ glibtop_get_proc_signal_p (glibtop *server,
 	memset (buf, 0, sizeof (glibtop_proc_signal));
 
 	/* It does not work for the swapper task. */
-	if (pid == 0) return;
+	if (pid == 0) return -1;
 	
 	/* Get the process information */
 	pinfo = kvm_getprocs (server->machine.kd, KERN_PROC_PID, pid, &count);
 	if ((pinfo == NULL) || (count != 1)) {
 		glibtop_warn_io_r (server, "kvm_getprocs (%d)", pid);
-		return;
+		return -1;
 	}
 
 	/* signal: mask of pending signals.
@@ -104,4 +106,6 @@ glibtop_get_proc_signal_p (glibtop *server,
 #endif
 
 	buf->flags = _glibtop_sysdeps_proc_signal;
+
+	return 0;
 }