O_NONBLOCK       1022 src/dps8/fnpuv.c             flags |= O_NONBLOCK;
O_NONBLOCK        260 src/dps8/udplib.c     rc = fcntl (sock, F_SETFL, fcntl (sock, F_GETFL, 0) | O_NONBLOCK);
O_NONBLOCK        388 src/simh/sim_fio.c # if defined(S_IFIFO) && defined(O_NONBLOCK)
O_NONBLOCK        391 src/simh/sim_fio.c     return fcntl(fileno(fptr), F_SETFL, flags | O_NONBLOCK);
O_NONBLOCK        738 src/simh/sim_sock.c sta = fcntl (sock, F_SETFL, fl | O_NONBLOCK);           /* set nonblock */