getrpcport - get RPC port number
int getrpcport(char *host, int prognum, int versnum, int proto);
getrpcport() 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.
Not in POSIX.1-2001. Present on the BSDs, Solaris, and many other
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