delete ntpd(8)'s unix control socket on shutdown

[Ricardo Mestre]

Hi,

ntpd(8) also doesn't seem to delete its unix control socket, but in this case
it's not a matter of calling control_cleanup() from a chrooted process
but instead not calling it at all.

OK?

Index: ntpd.c
===================================================================
RCS file: /cvs/src/usr.sbin/ntpd/ntpd.c,v
retrieving revision 1.113
diff -u -p -u -r1.113 ntpd.c
--- ntpd.c      9 Jan 2017 14:49:22 -0000       1.113
+++ ntpd.c      2 Aug 2018 10:17:11 -0000
@@ -244,7 +244,7 @@ main(int argc, char *argv[])
         * Constraint processes are forked with certificates in memory,
         * then privdrop into chroot before speaking to the outside world.
         */
-       if (pledge("stdio rpath inet settime proc exec id", NULL) == -1)
+       if (pledge("stdio rpath cpath inet settime proc exec id", NULL) == -1)
                err(1, "pledge");
 
        while (quit == 0) {
@@ -327,6 +327,7 @@ main(int argc, char *argv[])
 
        msgbuf_clear(&ibuf->w);
        free(ibuf);
+       control_cleanup(CTLSOCKET);
        log_info("Terminating");
        return (0);
 }