Date: Mon, 24 Jul 1995 23:02:08 +0400 (MSD) From: =?KOI8-R?Q?=E1=CE=C4=D2=C5=CA_=FE=C5=D2=CE=CF=D7?= aka "Andrey A. Chernov, Black Mage" <ache@astral.msk.su> To: bde@ZETA.ORG.AU, terry@cs.weber.edu Cc: hackers@freebsd.org, harry@hgac.com, jkh@violet.berkeley.edu Subject: Re: dial up at > 9600 baud Message-ID: <oWmu-4mSP1@astral.msk.su> In-Reply-To: <199507241714.DAA25914@godzilla.zeta.org.au>; from Bruce Evans at Tue, 25 Jul 1995 03:14:55 %2B1000 References: <199507241714.DAA25914@godzilla.zeta.org.au>
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In message <199507241714.DAA25914@godzilla.zeta.org.au> Bruce Evans
writes:
>>>The Linux driver has (had?) some optional support to help getty handle
>>>this. After the last close of cuaa, sleeping opens of ttyd return
>>>EAGAIN. This gives getty a chance to send the AT command.
>>Does EAGAIN allowed on open by POSIX?
>No. "... opening a terminal device file with the O_NONBLOCK flag clear
>shall cause the process to block until the terminal device is ready and
>available. The CLOCAL flag can also affect open()." [Opening terminal
>device files with O_NONBLOCK set is supposed to always work if the file
>permissions allow it. We probably break this by returning EBUSY for
>some exclusive access and bidirectional cases.]
Maybe we should allow open and return EBUSY on ioctls or writes?
--
Andrey A. Chernov : And I rest so composedly, /Now, in my bed,
ache@astral.msk.su : That any beholder /Might fancy me dead -
FidoNet: 2:5020/230.3 : Might start at beholding me, /Thinking me dead.
RELCOM Team,FreeBSD Team : E.A.Poe From "For Annie" 1849
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