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TTY(4) Kernel Interfaces Manual TTY(4) NAME tty - serial line interface drivers SYNOPSIS #include <sys/ttyio.h> DESCRIPTION The files refer to serial line devices such as the DZ11. They are nor- mally used in conjunction with the terminal line discipline, ttyld(4). Certain device-related parameters, such as parity and line speed, may be set by ioctl(2) calls: TIOCGDEV The argument points to a ttydevb structure to be filled in with current settings. TIOCSDEV The argument points to a ttydevb structure from which the para- meters are set. The ttydevb structure, as defined in <sys/ttyio.h>, is struct ttydevb { char ispeed; /* input speed */ char ospeed; /* output speed */ short flags; /* mode flags */ }; The speeds are encoded as follows. Impossible speeds are ignored. B0 0 (hang up device) B50 1 50 baud B75 2 75 baud B110 3 110 baud B134 4 134.5 baud B150 5 150 baud B200 6 200 baud B300 7 300 baud B600 8 600 baud B1200 9 1200 baud B1800 10 1800 baud B2400 11 2400 baud B4800 12 4800 baud B9600 13 9600 baud EXTA 14 External A EXTB 15 External B The flags are: F8BIT 040 eight-bit input and output ODDP 0100 odd parity EVENP 0200 even parity If is set, all eight bits of each output character are transmitted without imposing parity, and all eight bits of each input character are passed back without parity checking or stripping. Otherwise, requests that even parity be accepted and generated, odd parity. If both and are set, or if both are clear, even parity is generated and any parity is accepted. For DZ11 lines, 1200 baud and 8-bit mode are the defaults. The trans- mit and receive speeds are the same; ospeed is ignored. SEE ALSO ioctl(2), ttyld(4) BUGS Every hardware interface doesn't support every operation. TTY(4)