rexec
int rexec __P((char **, int, char *, char *, char *, int *));
return rexec(&host, rexecserv->s_port, user, NULL,
int rexec(char **, int, char *, char *, char *, int *);
if ((s = rexec(&host, sv->s_port, user, pass, cmd, NULL)) == -1)