Messages in this thread | | | Subject | Re: [BUG] drivers/tty: read() on a noncanonical blocking tty randomly fails when VMIN > received >= buf | From | Julio Guerra <> | Date | Thu, 5 May 2016 01:27:28 +0200 |
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>> 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 avail‐ > 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
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