Writing data and output processing
When a process writes data onto a terminal-device-file, c_oflag controls how to process those bytes (see
UNIX System V provides buffering such that a call to write schedules data for transfer to the device, but has not necessarily completed the transfer when the call returns (see
for the effects of O_NONBLOCK on write).
Closing a terminal device file
Non-canonical mode input processing
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UnixWare 7 Release 7.1.4 - 27 April 2004