pledge it

Index: xcape.c
--- xcape.c.orig
+++ xcape.c
@@ -191,6 +191,12 @@ int main (int argc, char **argv)
     if (self->debug != True)
         daemon (0, 0);
 
+    if (pledge ("stdio", NULL) == -1)
+    {
+        fprintf (stderr, "pledge: %s\n", strerror(errno));
+        exit (EXIT_FAILURE);
+    }
+
     sigemptyset (&self->sigset);
     sigaddset (&self->sigset, SIGINT);
     sigaddset (&self->sigset, SIGTERM);