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321126 |
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18-Jul-2017 |
ngie |
MFC r318701,r319842:
r318701:
tcsendbreak(3): delete spurious blank line at the end of the man page
r319842:
getbsize(3): clarify that underflow/overflow warnings in regard to $BLOCKSIZE
gets output via warnx(3)
This helps set expectations for how one might deal with those messages, i.e.,
mute output from /dev/stderr today, since that's where vwarn(3) outputs messages
to today.
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| #
314538 |
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02-Mar-2017 |
ian |
MFC r311954, r311996, r312077, r312080:
Rework tty_drain() to poll the hardware for completion, and restore
drain timeout handling to historical freebsd behavior.
The primary reason for these changes is the need to have tty_drain() call
ttydevsw_busy() at some reasonable sub-second rate, to poll hardware that
doesn't signal an interrupt when the transmit shift register becomes empty
(which includes virtually all USB serial hardware). Such hardware hangs
in a ttyout wait, because it never gets an opportunity to trigger a wakeup
from the sleep in tty_drain() by calling ttydisc_getc() again, after
handing the last of the buffered data to the hardware.
Restructure the tty_drain loop so that device-busy is checked one more time
after tty_timedwait() returns an error only if the error is EWOULDBLOCK;
other errors cause an immediate return. This fixes the case of the tty
disappearing while in tty_drain().
Check tty_gone() after allocating IO buffers. The tty lock has to be
dropped then reacquired due to using M_WAITOK, which opens a window in
which the tty device can disappear. Check for this and return ENXIO
back up the call chain so that callers can cope.
Correct the comments about how much buffer is allocated.
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| #
48794 |
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12-Jul-1999 |
nik |
Add $Id$, to make it simpler for members of the translation teams to
track.
The $Id$ line is normally at the bottom of the main comment block in the
man page, separated from the rest of the manpage by an empty comment,
like so;
.\" $Id$
.\"
If the immediately preceding comment is a @(#) format ID marker than the
the $Id$ will line up underneath it with no intervening blank lines.
Otherwise, an additional blank line is inserted.
Approved by: bde
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