GETRPCPORT(3)          FreeBSD 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.

FreeBSD 13.1-RELEASE-p6         October 6, 1987        FreeBSD 13.1-RELEASE-p6