On 2020-03-11 22:55, Brian Inglis wrote:
VMIN > 0 || VTIME > 0 implies blocking; O_NONBLOCK implies SIGIO
delivery; see:
https://www.tldp.org/HOWTO/pdf/Serial-Programming-HOWTO.pdf
https://www.cmrr.umn.edu/~strupp/serial.html
https://en.wikibooks.org/wiki/Serial_Programming/termios
also read the man pages carefully and *assume* nothing; functions should work
*exactly* as documented: there be dragons!
According to https://www.cmrr.umn.edu/~strupp/serial.html "*Timeouts are
ignored in canonical input mode or when the/NDELAY/option is set on the
file via/open/or/fcntl/."*
This leads me to believe the current cygwin implementation is not
correct. Changing the VMIN and VTIME should have no effect on the read()
behavior if the file was opened with O_NOBLOCK.
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