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Mon, 13 Mar 2023 15:07:56 +0000 Received: from DM8PR09MB7095.namprd09.prod.outlook.com ([fe80::f064:8801:7192:b0e7]) by DM8PR09MB7095.namprd09.prod.outlook.com ([fe80::f064:8801:7192:b0e7%6]) with mapi id 15.20.6178.024; Mon, 13 Mar 2023 15:07:56 +0000 From: "Lavrentiev, Anton (NIH/NLM/NCBI) [C]" To: Matthew Rickard , Csaba Raduly , cygwin list Subject: RE: [EXTERNAL] Re: 3.4.6-1 shm_open always returns -1, errno EINVAL Thread-Topic: [EXTERNAL] Re: 3.4.6-1 shm_open always returns -1, errno EINVAL Thread-Index: AQHZVM6CSB5Z0OJhEkqlfxUEEG6tx673wcaAgAENjZA= Date: Mon, 13 Mar 2023 15:07:28 +0000 Deferred-Delivery: Mon, 13 Mar 2023 15:07:19 +0000 Message-ID: References: <9ee76b85-9d35-8e30-43b4-5bfd51ff78fb@gmail.com> In-Reply-To: <9ee76b85-9d35-8e30-43b4-5bfd51ff78fb@gmail.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=ncbi.nlm.nih.gov; x-ms-publictraffictype: Email x-ms-traffictypediagnostic: DM8PR09MB7095:EE_|BY3PR09MB8609:EE_ x-ms-office365-filtering-correlation-id: 8ad9fdb8-2d53-49f9-27f6-08db23d4ba2d x-ms-exchange-senderadcheck: 1 x-ms-exchange-antispam-relay: 0 x-microsoft-antispam: BCL:0; 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Note that "setting errno to zero" is not guaranteed in case of a successful= completion of a library function or a system call. Generally, "errno" reflects an error that occurred last when such a call fa= iled (so in other words, in case of a successful completion, "errno" can still carry over an error from a previously failed = call). In this particular use case, it looks like "errno" was clear from the get go because nothing was called prior to "shm_= open()", and so it remained so when the call returned (successfully). HTH, Anton Lavrentiev Contractor NIH/NLM/NCBI