Hi -
I thought I'd give lsh a try, just to see how it compares to openssh...
The client didn't work well on NetBSD, got a message like "unexpected
EWOULDBLOCK" on each keystroke.
Looked a bit deeper and found that stdin is set to O_NONBLOCK and
a raw tty mode with c_cc[VMIN] > 1 and c_cc[VTIME] > 0.
I'll append a little test program which does the same. I've tried
it on 3 operating systems (Linux, NetBSD, Digital UNIX), and it
behaves differently on each:
-on Linux, if a key is pressed, the read returns immediately with
that one character
-on NetBSD, the read returns with no data but EWOULDBLOCK
-on D'UNIX, the poll() doesn't teturn before 4 keypresses are done;
the read() returns these 4 characters
Indeed, in SUSv2's termios page is a sentence which says that if
both O_NONBLOCK and VTIME>0 are set, the behaviour is more or less
undefined.
I've solved my immediate problems by setting VMIN to 1 instead of 4
in unix_interact.c:do_make_raw(), but VTIME is still pointless,
so I wouldn't call this a clean solution.
(Don't know what liboop uses under the hood, but in case it does
poll(), anything with VMIN>1 wouldn't work with D'Unix...)
best regards
Matthias