.\" @(#)getrpcport.3r 2.2 88/08/02 4.0 RPCSRC; from 1.12 88/02/26 SMI .\" $FreeBSD: src/lib/libc/rpc/getrpcport.3,v 1.9 2004/07/02 23:52:12 ru Exp $ .\" .Dd October 6, 1987 .Dt GETRPCPORT 3 .Os .Sh NAME .Nm getrpcport .Nd get RPC port number .Sh LIBRARY .Lb libc .Sh SYNOPSIS .In rpc/rpc.h .Ft int .Fn getrpcport "char *host" "int prognum" "int versnum" "int proto" .Sh DESCRIPTION The .Fn getrpcport function returns the port number for version .Fa versnum of the RPC program .Fa prognum running on .Fa host and using protocol .Fa proto . It returns 0 if it cannot contact the portmapper, or if .Fa prognum is not registered. If .Fa prognum is registered but not with version .Fa versnum , it will still return a port number (for some version of the program) indicating that the program is indeed registered. The version mismatch will be detected upon the first call to the service.