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termios.3: Fix error in discussion of MIN > 0, TIME == 0 noncanonical mode 

As reported by Peter Hurley, for the MIN > 0, TIME == 0 case:

    read() may unblock when MIN bytes are available but return
    up to the 'count' parameter if more input arrives in between
    waking and copying into the user buffer.
    ...
    read() may also _not_ return until MIN bytes have been
    received, even if 'count' bytes have been received.

MTK: verified the above by experiment.

Reported-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2014-03-21 10:42:12 +01:00
parent 959c4b2519
commit 4b985dd60a
1 changed files with 2 additions and 2 deletions
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man3/termios.3
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@ -736,8 +736,8 @@ returns 0.
.TP
MIN > 0; TIME == 0:
.BR read (2)
blocks until the lesser of MIN bytes or the number of bytes requested
are available, and returns the lesser of these two values.
blocks until MIN bytes are available,
and returns up to the number of bytes requested.
.TP
MIN == 0; TIME > 0:
TIME specifies the limit for a timer in tenths of a second.