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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: 23527403-f4bf-4752-3a3a-08da5f521835 X-MS-Exchange-CrossTenant-originalarrivaltime: 06 Jul 2022 13:19:02.4132 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 14b77578-9773-42d5-8507-251ca2dc2b06 X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR09MB5623 X-OriginatorOrg: ncbi.nlm.nih.gov X-Spam-Status: No, score=-2.0 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_EF, SPF_PASS, TXREP, T_SCC_BODY_TEXT_LINE, T_SPF_HELO_PERMERROR autolearn=ham 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: Wed, 06 Jul 2022 13:19:59 -0000 > On Linux, select(2) is really only capable to > handle file descriptors numbers up to descriptor number 1023, That is not true. While FD_SETSIZE is defined as a fixed constant, Linux kernel does not actually "know" (or care) about it. So you can have an array of fd_sets, like this, in your code: fd_set r_fds[NFDS]; and then if "fd" is a file descriptor in question, you'd do FD_SET(fd % FD_SETSIZE, &r_fds[fd / FD_SETSIZE]); and then n =3D select(maxfd + 1, r_fds, ...); The Linux kernel is guided by the maxfd parameter and assumes the sets are = as large as required to cover that number of file descriptors (obviously check= ing that those sets are still within the process reach). NFDS above is chosen such a way that "NFDS * FD_SETSIZE" covers all your re= quired file descriptors, if there are more than just FD_SETSIZE. Anton Lavrentiev Contractor NIH/NLM/NCBI