glibc/termios/Versions

libc {
  GLIBC_2.0 {
    # c*
    cfgetispeed; cfgetospeed; cfmakeraw; cfsetispeed; cfsetospeed; cfsetspeed;

    # t*
    tcdrain; tcflow; tcflush; tcgetattr; tcgetpgrp; tcsendbreak; tcsetattr;
    tcsetpgrp;
  }
  GLIBC_2.1 {
    # t*
    tcgetsid;
  }
  GLIBC_PRIVATE {
    # functions which have an additional interface since they are
    # are cancelable.
    __libc_tcdrain;
  }
}