https://docs.oracle.com/cd/E88353_01/html/E37843/clnt-perror-3c.html
rpc_clnt_calls, clnt_call , clnt_send , clnt_freeres , clnt_geterr , clnt_perrno , clnt_perror , clnt_sperrno , clnt_sperror , rpc_broadcast ,...
man pagesbasic libraryperrorsectionfunctions