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.th DC IV 8/22/73 .sh NAME dc \*- DC-11 communications interface .sh DESCRIPTION The special files /dev/tty0, /dev/tty1, ... refer to the DC11 asynchronous communications interfaces. At the moment there are 12 of them, but the number is subject to change. .s3 When one of these files is opened, it causes the process to wait until a connection is established. In practice user's programs seldom open these files; they are opened by .it init and become a user's input and output file. The very first type\%writer file open in a process becomes the .it "control typewriter" for that process. The control type\%writer plays a special role in handling quit or interrupt signals, as discussed below. The control type\%writer is inherited by a child process during a .it fork. .s3 A terminal associated with one of these files ordinarily operates in full-duplex mode. Char\%ac\%ters may be typed at any time, even while output is occurring, and are only lost when the system's char\%ac\%ter input buffers become completely choked, which is rare, or when the user has accumulated the maximum allowed number of input characters which have not yet been read by some program. Currently this limit is 256 characters. When the input limit is reached all the saved characters are thrown away without notice. .s3 When first opened, the interface mode is 150 baud; either parity accepted; 10 bits/character (one stop bit); and newline action character. The system delays transmission after sending certain function characters. Delays for horizontal tab, newline, and form feed are calculated for the Teletype Model 37; the delay for carriage return is calculated for the GE TermiNet 300. Most of these operating states can be changed by using the system call stty(II). In particular the following hardware states are program settable independently for input and output (see DC11 manual): 134.5, 150, 300, or 1200 baud; one or two stop bits on output; and 5, 6, 7, or 8 data bits/character. In addition, the following software modes can be invoked: acceptance of even parity, odd parity, or both; a raw mode in which all characters may be read one at a time; a carriage return (CR) mode in which CR is mapped into newline on input and either CR or line feed (LF) cause echoing of the sequence LF-CR; mapping of upper case letters into lower case; suppression of echoing; suppression of delays after function characters; and the printing of tabs as spaces. See getty(VII) for the way that terminal speed and type are detected. .s3 Normally, type\%writer input is processed in units of lines. This means that a program attempting to read will be suspended until an entire line has been typed. Also, no matter how many char\%ac\%ters are requested in the read call, at most one line will be returned. It is not however necessary to read a whole line at once; any number of char\%ac\%ters may be requested in a read, even one, without losing information. .s3 During input, erase and kill processing is normally