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FreeBSD 11.0 - man page for getrpcport (freebsd section 3)

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

getrpcport -- get RPC port number
Standard C Library (libc, -lc)
int getrpcport(char *host, int prognum, int versnum, int proto);
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.
October 6, 1987 BSD

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