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| Seventh Edition Unix terminal interface ： ウィキペディア英語版 |
Seventh Edition Unix terminal interface
The Seventh Edition Unix terminal interface is the generalized abstraction, comprising both an Application Programming Interface for programs and a set of behavioural expectations for users, of a terminal as historically available in Seventh Edition Unix. It has been largely superseded by the POSIX terminal interface.
== Concepts and overview ==
The terminal interface provided by Seventh Edition Unix and UNIX/32V, and also presented by BSD version 4 as the ''old terminal driver'', was a simple one, largely geared towards teletypewriters as terminals. Input was entered a line at a time, with the terminal driver in the operating system (and not the terminals themselves) providing simple line editing capabilities. A buffer was maintained by the kernel in which editing took place. Applications reading terminal input would receive the contents of the buffer only when the key was pressed on the terminal to end line editing. The key sent from the terminal to the system would erase ("kill") the entire current contents of the editing buffer, and would be normally displayed as an '@' symbol followed by a newline sequence to move the print position to a fresh blank line. The key sent from the terminal to the system would erase the last character from the end of the editing buffer, and would be normally displayed as an '#' symbol, which users would have to recognize as denoting a "rubout" of the preceding character (teletypewriters not being physically capable of erasing characters once they have been printed on the paper).
From a programming point of view, a terminal device had transmit and receive baud rates, "erase" and "kill" characters (that performed line editing, as explained), "interrupt" and "quit" characters (generating signals to all of the processes for which the terminal was a controlling terminal), "start" and "stop" characters (used for software flow control), an "end of file" character (acting like a carriage return except discarded from the buffer by the read() system call and therefore potentially causing a zero-length result to be returned) and various ''mode flags'' determining whether local echo was emulated by the kernel's terminal driver, whether modem flow control was enabled, the lengths of various output delays, mapping for the carriage return character, and the three input modes.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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