From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from endymion.arp.harvard.edu (endymion.arp.harvard.edu [140.247.179.94]) by sourceware.org (Postfix) with ESMTPS id E13A5395C85E for ; Thu, 12 Mar 2020 01:01:34 +0000 (GMT) Received: from [192.168.7.23] (pool-74-104-152-231.bstnma.fios.verizon.net [74.104.152.231]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by endymion.arp.harvard.edu (Postfix) with ESMTPSA id 7ABEC6C04C2 for ; Wed, 11 Mar 2020 21:01:34 -0400 (EDT) Subject: Re: Setting termios VMIN > 0 and VTIME > 0 on non blocking file To: "cygwin@cygwin.com" References: <9e4c6428-59de-df07-9e33-44ba95d5497f@gmail.com> <5be321d9-10c2-0853-b716-2abd10a4db3a@SystematicSw.ab.ca> From: Norton Allen Message-ID: Date: Wed, 11 Mar 2020 21:01:34 -0400 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0 MIME-Version: 1.0 In-Reply-To: <5be321d9-10c2-0853-b716-2abd10a4db3a@SystematicSw.ab.ca> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US X-Spam-Status: No, score=-2.6 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_LOW, SPF_HELO_NONE, SPF_PASS autolearn=ham autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: cygwin@cygwin.com X-Mailman-Version: 2.1.29 Precedence: list List-Id: Cygwin mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 12 Mar 2020 01:01:35 -0000 On 3/11/2020 5:55 PM, Brian Inglis wrote: > VMIN > 0 || VTIME > 0 implies blocking; O_NONBLOCK implies SIGIO delivery; see: While I agree with everything else you said there, I don't believe either of these are true, unless by 'implies' you mean that's how you usually do it. I have done a lot of work with non-zero VMIN and/or VTIME in non-blocking situations, and I've done non-blocking with different approaches to delivery. -- ============================================================= Norton Allen (he/him/his) Software Engineer Harvard University School of Engineering and Applied Sciences 12 Oxford St., Link Bldg. (Office 282) Cambridge, MA 02138 Phone: (617) 998-5553 =============================================================