Re: [BUG] drivers/tty: read() on a noncanonical blocking tty randomly fails when VMIN > received >= buf

[Julio Guerra]

> > When a tty (here a slave pty) is set in noncanonical input and blocking read modes, a read() randomly blocks when:
> > "VMIN > kernel received >= user buffer size > 0".
> >
> > The standard says that read() should block until VMIN bytes are received [1][2]. Whether this is an implementation defined case not really specified by POSIX or not, it should not behave randomly (otherwise it really should be documented in termios manpage).
>
> This is not a bug.
>
> From the termios(3) man page:
>
>        * MIN > 0; TIME == 0: read(2) blocks until the lesser of MIN bytes or the number of bytes requested are availâ
>          able, and returns the lesser of these two values.

This does not appear in my man...

Anyway, how do you explain the random behavior then?

--
Julio Guerra