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" Raw mode cfmakeraw() sets the terminal to something like the "raw" mode of the old Version 7 terminal driver: input is available character by characâ ter, echoing is disabled, and all special processing of terminal input and output characters is disabled. The terminal attributes are set as follows: termios_p->c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP | INLCR | IGNCR | ICRNL | IXON); termios_p->c_oflag &= ~OPOST; termios_p->c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN); termios_p->c_cflag &= ~(CSIZE | PARENB); termios_p->c_cflag |= CS8; " If that is set on the socket for the telnet interface it does make a difference.