modify some flags, and then call tcsetattr (3), this creates a window in which changespresent: setpgid () tcdrain () tcflush () tcgetpgrp () tcsendbreak () tcsetattr () tcsetpgrp () MF - _POSIX_MAPPED_FILES - _SC_MAPPED_FILESvery long.) As an example: int tcsetattr(int fd , int optional_actions , const struct termiostcgetattr (3) tcgetpgrp (3) tcsendbreak (3) tcsetattr (3) tcsetpgrp (3) time (2) timer_getoverrun