Plan 9 from Bell Labs’s /usr/web/sources/patch/applied/isatty/files
/sys/src/cmd/ip/telnet.c telnet.c /sys/src/cmd/rc/plan9.c plan9.c /sys/src/cmd/upas/common/libsys.c libsys.c /sys/src/libstdio/setvbuf.c setvbuf.c