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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: DM8PR09MB7095.namprd09.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 59d69dea-1cbb-486a-cef6-08da5e9096b2 X-MS-Exchange-CrossTenant-originalarrivaltime: 05 Jul 2022 14:13:52.2792 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 14b77578-9773-42d5-8507-251ca2dc2b06 X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW4PR09MB8994 X-OriginatorOrg: ncbi.nlm.nih.gov X-Spam-Status: No, score=-1.6 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_EF, KAM_ASCII_DIVIDERS, RCVD_IN_MSPIKE_H2, SPF_PASS, TXREP, T_SCC_BODY_TEXT_LINE, T_SPF_HELO_PERMERROR autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: cygwin@cygwin.com X-Mailman-Version: 2.1.29 Precedence: list List-Id: General Cygwin discussions and problem reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 05 Jul 2022 14:14:07 -0000 Hi, There's some inconsistency between and : sys/select.h has this: ----------------------- /* * Select uses bit masks of file descriptors in longs. * These macros manipulate such bit fields (the filesystem macros use chars= ). * FD_SETSIZE may be defined by the user, but the default here * should be >=3D NOFILE (param.h). */ #ifndef FD_SETSIZE #define FD_SETSIZE 64 #endif ---------------------- Now, this is the relevant part of sys/param.h looks like this: ---------------------- /* Max number of open files. The Posix version is OPEN_MAX. */ /* Number of fds is virtually unlimited in cygwin, but we must provide some reasonable value for Posix conformance */ #define NOFILE 8192 ---------------------- So it's either "<=3D NOFILE" that was actually meant to be there in the com= ment (or, an equivalent "should NOT be > NOFILE"), or FD_SETSIZE should have been def= ined as 8192, if the comment is actually correct. Or maybe I'm missing something here :-= ) I understand that if I redefined FD_SETSIZE in my code before including , it'd work with whatever large (or small) fd_set I need, but that's not what= I'm after. Anton Lavrentiev Contractor NIH/NLM/NCBI