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To: cygwin-developers@cygwin.com References: <20210915092100.796985ae33039f3184483450@nifty.ne.jp> <20210915094454.42ef1d085d9bf92a1af8d39a@nifty.ne.jp> <20210915095911.415d174ea38fb2d2ea8e5432@nifty.ne.jp> <20210915194858.845bcd54c0c63246b40703a8@nifty.ne.jp> <20210915205433.014102a9c1204687135e1417@nifty.ne.jp> <20210915220450.a96397d8b8159d9adfbdab07@nifty.ne.jp> <3ca95472-9fb2-3e62-3e28-1bd2f85bc018@cornell.edu> <20210916091324.4449ea2a6551f6456910fa81@nifty.ne.jp> From: Ken Brown Message-ID: <8f84235c-40ae-e74d-1efc-05da5e7a00ae@cornell.edu> Date: Wed, 15 Sep 2021 22:26:42 -0400 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.14.0 In-Reply-To: <20210916091324.4449ea2a6551f6456910fa81@nifty.ne.jp> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-ClientProxiedBy: CH2PR14CA0035.namprd14.prod.outlook.com (2603:10b6:610:56::15) To BN7PR04MB4388.namprd04.prod.outlook.com (2603:10b6:406:f8::19) MIME-Version: 1.0 Received: from [IPv6:2603:7081:7e3f:3419:7ce2:1edc:8e51:87cc] (2603:7081:7e3f:3419:7ce2:1edc:8e51:87cc) by CH2PR14CA0035.namprd14.prod.outlook.com (2603:10b6:610:56::15) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4523.14 via Frontend Transport; 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/* We cannot know actual write pipe space. */ >> DWORD nbytes_in_pipe; >> if (!PeekNamedPipe (query_hdl, NULL, 0, NULL, &nbytes_in_pipe, NULL)) >> - return 1; >> + return -1; >> fpli.WriteQuotaAvailable = fpli.InboundQuota - nbytes_in_pipe; >> } >> if (fpli.WriteQuotaAvailable > 0) > > I think this is not correct. IIUC, return value -1 means that the > other side of pipe is closed. However, in this case, NtQueryInformationFile > is succeeded previously. So the other side of pipe is still alive. I cannot > imagine when PeekNamedPipe fails, however, if query_hdl is lost accidentally, > returning 1 is the correct thing just as the case query_hdl == NULL. Ah, you're right of course. A failure of a call on query_hdl doesn't indicate an exceptional condition on the write side of the pipe. Thanks. Ken