freebsd man page for getrpcport

GETRPCPORT(3)						   BSD Library Functions Manual 					     GETRPCPORT(3)

NAME
     getrpcport -- get RPC port number

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     int
     getrpcport(char *host, int prognum, int versnum, int proto);

DESCRIPTION
     The getrpcport() function returns the port number for version versnum of the RPC program prognum running on host and using protocol proto.
     It returns 0 if it cannot contact the portmapper, or if prognum is not registered.  If prognum is registered but not with version 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.

BSD
								  October 6, 1987							       BSD