fd_set           1966 src/dps8/dps8_mgp.c   fd_set rfd;
fd_set           1050 src/simh/sim_sock.c fd_set rw_set, er_set;
fd_set           1051 src/simh/sim_sock.c fd_set *rw_p = &rw_set;
fd_set           1052 src/simh/sim_sock.c fd_set *er_p = &er_set;