we have getprotobyname_r() now so use it

libc/inet/rpc/clnt_generic.c

@@ -53,7 +53,9 @@ clnt_create (const char *hostname, u_long prog, u_long vers,
   struct hostent hostbuf, *h;
   size_t hstbuflen;
   char *hsttmpbuf;
-  struct protoent *p;
+  struct protoent protobuf, *p;
+  size_t prtbuflen;
+  char *prttmpbuf;
   struct sockaddr_in sin;
   struct sockaddr_un sun;
   int sock;
@@ -113,14 +115,23 @@ clnt_create (const char *hostname, u_long prog, u_long vers,
   memset (sin.sin_zero, 0, sizeof (sin.sin_zero));
   memcpy ((char *) &sin.sin_addr, h->h_addr, h->h_length);
 
-#warning getprotobyname is not reentrant...  Add getprotobyname_r
-  p = getprotobyname(proto);
-  if (p == NULL) {
-      struct rpc_createerr *ce = &get_rpc_createerr ();
-      ce->cf_stat = RPC_UNKNOWNPROTO;
-      ce->cf_error.re_errno = EPFNOSUPPORT;
-      return NULL;
-  }
+  prtbuflen = 1024;
+  prttmpbuf = alloca (prtbuflen);
+  while (getprotobyname_r (proto, &protobuf, prttmpbuf, prtbuflen, &p) != 0
+	 || p == NULL)
+	if (errno != ERANGE)
+      {
+	struct rpc_createerr *ce = &get_rpc_createerr ();
+	ce->cf_stat = RPC_UNKNOWNPROTO;
+	ce->cf_error.re_errno = EPFNOSUPPORT;
+	return NULL;
+      }
+    else
+      {
+	/* Enlarge the buffer.  */
+	prtbuflen *= 2;
+	prttmpbuf = alloca (prtbuflen);
+      }
 
   sock = RPC_ANYSOCK;
   switch (p->p_proto)