clnt_broadcast(3): fix eachresult argument type

The `eachresult` argument is documented to take a function pointer of
type:

	bool_t (*)(caddr_t, struct sockaddr_in *)

It was declared to take a resultproc_t which has historically been
declared to be:

	bool_t (*resultproc_t)(caddr_t, ...);

This overlapped well enough for currently supported ABIs where variadic
arguments are passed in registers, but this declaration is misaligned
with the documentation (resultproc_t takes three arguments) and will be
fixed in a followup commit.

Fix the type to be non-variadic, matching callbacks, and define a
convenience type of as most callbacks take something other than a char *
as their first argument and need to be cast.

Effort:		CHERI upstreaming
Reviewed by:	ngie, glebius, jhb
Sponsored by:	DARPA, AFRL
Differential Revision:	https://reviews.freebsd.org/D54940

include/rpc/pmap_clnt.h

@@ -64,6 +64,8 @@
 #include <sys/cdefs.h>
 
 __BEGIN_DECLS
+typedef bool_t (*clnt_broadcast_resultproc_t)(caddr_t, struct sockaddr_in *);
+
 extern bool_t		pmap_set(u_long, u_long, int, int);
 extern bool_t		pmap_unset(u_long, u_long);
 extern struct pmaplist	*pmap_getmaps(struct sockaddr_in *);
@@ -75,7 +77,7 @@ extern enum clnt_stat	pmap_rmtcall(struct sockaddr_in *,
 extern enum clnt_stat	clnt_broadcast(u_long, u_long, u_long,
 				       xdrproc_t, void *,
 				       xdrproc_t, void *,
-				       resultproc_t);
+				       clnt_broadcast_resultproc_t);
 extern u_short		pmap_getport(struct sockaddr_in *,
 				     u_long, u_long, u_int);
 __END_DECLS

lib/libc/rpc/rpc_soc.c

@@ -310,7 +310,7 @@ registerrpc(int prognum, int versnum, int procnum,
  * Support the earlier calling style of the callback function with a
  * per-thread temporary copy of the real callback.
  */
-static _Thread_local resultproc_t	clnt_broadcast_result;
+static _Thread_local clnt_broadcast_resultproc_t clnt_broadcast_result;
 
 /*
  * Need to translate the netbuf address into sockaddr_in address.
@@ -336,7 +336,8 @@ rpc_wrap_bcast(char *resultp, struct netbuf *addr, struct netconfig *nconf)
  */
 enum clnt_stat
 clnt_broadcast(u_long prog, u_long vers, u_long proc, xdrproc_t xargs,
-    void *argsp, xdrproc_t xresults, void *resultsp, resultproc_t eachresult)
+    void *argsp, xdrproc_t xresults, void *resultsp,
+    clnt_broadcast_resultproc_t eachresult)
 /*
  *	u_long		prog;		// program number
  *	u_long		vers;		// version number

usr.bin/rup/rup.c

@@ -206,7 +206,7 @@ allhosts(void)
 	clnt_stat = clnt_broadcast(RSTATPROG, RSTATVERS_TIME, RSTATPROC_STATS,
 				   (xdrproc_t)xdr_void, NULL,
 				   (xdrproc_t)xdr_statstime, &host_stat,
-				   (resultproc_t)rstat_reply);
+				   (clnt_broadcast_resultproc_t)rstat_reply);
 	if (clnt_stat != RPC_SUCCESS && clnt_stat != RPC_TIMEDOUT)
 		errx(1, "%s", clnt_sperrno(clnt_stat));
 }

usr.bin/rusers/rusers.c

@@ -208,7 +208,7 @@ allhosts(void)
 	clnt_stat = clnt_broadcast(RUSERSPROG, RUSERSVERS_IDLE,
 	    RUSERSPROC_NAMES, (xdrproc_t)xdr_void, NULL,
 	    (xdrproc_t)xdr_utmpidlearr, (char *)&up,
-	    (resultproc_t)rusers_reply);
+	    (clnt_broadcast_resultproc_t)rusers_reply);
 	if (clnt_stat != RPC_SUCCESS && clnt_stat != RPC_TIMEDOUT)
 		errx(1, "%s", clnt_sperrno(clnt_stat));
 }

usr.sbin/bootparamd/callbootd/callbootd.c

@@ -111,7 +111,7 @@ main(int argc, char **argv)
 			       (char *)&whoami_arg,
 			       (xdrproc_t)xdr_bp_whoami_res,
 			       (char *)&stat_whoami_res,
-			       (resultproc_t)eachres_whoami);
+			       (clnt_broadcast_resultproc_t)eachres_whoami);
        exit(0);
      }
 
@@ -134,7 +134,7 @@ main(int argc, char **argv)
 			       (char *)&getfile_arg,
 			       (xdrproc_t)xdr_bp_getfile_res,
 			       (char *)&stat_getfile_res,
-			       (resultproc_t)eachres_getfile);
+			       (clnt_broadcast_resultproc_t)eachres_getfile);
       exit(0);
     }
 

usr.sbin/ypbind/ypbind.c

@@ -748,7 +748,7 @@ broadcast(struct _dom_binding *ypdb)
 		stat = clnt_broadcast(YPPROG, YPVERS, YPPROC_DOMAIN_NONACK,
 	    		(xdrproc_t)xdr_domainname, &ptr,
 		        (xdrproc_t)xdr_bool, &out,
-	    		(resultproc_t)broadcast_result);
+			(clnt_broadcast_resultproc_t)broadcast_result);
 	}
 
 	if (stat != RPC_SUCCESS) {