X-Recipient: archive-cygwin AT delorie DOT com DomainKey-Signature: a=rsa-sha1; c=nofws; d=sourceware.org; h=list-id :list-unsubscribe:list-subscribe:list-archive:list-post :list-help:sender:from:to:subject:date:message-id:content-type :content-transfer-encoding:mime-version; q=dns; s=default; b=pp+ BiJY2d92LoSsr79urioafPrd/sQrKLHCgaUN31omTm1nI8RQdxO+feLiF8/BQ5qB PiAyU+45rPwZ09RMLJeeLhdK/JYB+ue1kUiS67K0pzc3U37tIZScrnKp27Ilmjsw REfDcQEzTp301lDMTwQcAs2adExYNUn9KUljdX7M= DKIM-Signature: v=1; a=rsa-sha1; c=relaxed; d=sourceware.org; h=list-id :list-unsubscribe:list-subscribe:list-archive:list-post :list-help:sender:from:to:subject:date:message-id:content-type :content-transfer-encoding:mime-version; s=default; bh=7Vrnxm+lI qqhurKgVxQaFxc+ORo=; b=oxpUBIr0MCVkVZ0EgYKWKCADOgEKPa/B1RW3xqInq qGF2F3Idh+pEEIBTz/VJ7NKBNwva6ii3yRhEuE61JX0WDcYRu3hObEWmjcxj3TL6 UuUPMmmNoaU5PfXJ2krjy5OmD7kAOvP6JGgDp1/mwvwCvbcvDkP6Q0o7dOq/bz3t sI= Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner AT cygwin DOT com Mail-Followup-To: cygwin AT cygwin DOT com Delivered-To: mailing list cygwin AT cygwin DOT com Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-1.9 required=5.0 tests=AWL,BAYES_00,MIME_BASE64_BLANKS,RCVD_IN_DNSWL_NONE,SPF_HELO_PASS,SPF_PASS autolearn=ham version=3.3.2 spammy=brilliant, sua, H*MI:outlook X-HELO: na01-by2-obe.outbound.protection.outlook.com From: Steven Bardwell To: "cygwin AT cygwin DOT com" Subject: RE: FD_SETSIZE and sizeof(fd_set) - thanks for a simple solution Date: Thu, 23 Jun 2016 12:07:09 +0000 Message-ID: authentication-results: spf=none (sender IP is ) smtp.mailfrom=SBardwell AT lbmsys DOT com; x-ms-office365-filtering-correlation-id: 0c6b9765-2fe1-4c10-2475-08d39b5ee75a x-microsoft-exchange-diagnostics: 1;DM3PR18MB0842;6:c/2A5bFyr5tJ3CZF17Nju8Gr2spKR9K7Abnwzev6NpRakAEureuSSL8FNVUp2eNry9iIv+IdnT2zu99dF7GSjjeUJOZRdSE97LXzBj6peamk0WFZbZSzQb7dsavMXvfnkdkunMPE+ENLJ4IugUzfJKnwSPXp242vj9pdOzJx9ELJs5BCGzTyk6o4pd/tDLV7Jy5kvL6RA1XpLMZQXS0YABU/6+e1P3V2t9PhVwWiM/l1Pax9XIY5T00XQdZVM5O/kytxW7NrnvKtM3yqsfq7WDnqxchqaFZsdytiXg8BxWS1XaFp5VcUBGmfMd8lroIcEBNuGFJisT+verQvdlEsvQ==;5:smf6BLzBmU0kw5ONBICsZgWuhwh7hQ0YHGJp0zzsRBtcYa7jrcp85YSHTltOKaS//49N1vQX4j2G6p+TESNBCHCFsOMscGD7kC6Hvtn1RAlKbtZ/dQ70+EvrFswm+ti1l8yKR/FthT03VHYrSdRz2A==;24:xsBtm30pbiLL8ssBO2XbjzaNmAQPBUFfX/jcsrF4kE6ZC4wKFN8VHaUA+whzBymGysDvlEanmDezBLc3J3ge2kAv7F+iQDDQVlcgy8dCVNk=;7:dKN5sm/Z8nfWhFjckXGGg3EyTzLq9MRoem+djbBv00vtlm7XE0dmZZCec6QIn3b2HIJr1hr/XSUSOXoSMiAG9J2BhBWVxchyQ/+vYzrKWWlLJxTyl4O/Jly4YKIwhixXEAymrsB5kesTYxysDY6MaNlRJEobUaZdXVuIzJZG9QDN9bx9N0SXG1wS1DK3xGCB2vmFL1yJXOBxHhGgIpdcnDgwpUU6Na4+D9U1xtPbgWcsm/bwEOL8bifbwKPZjWpRH3n6gy2ZKH/nsPEED8IG/g== x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:;SRVR:DM3PR18MB0842; x-microsoft-antispam-prvs: x-exchange-antispam-report-test: UriScan:; x-exchange-antispam-report-cfa-test: BCL:0;PCL:0;RULEID:(6040130)(601004)(2401047)(8121501046)(5005006)(10201501046)(3002001)(6041072)(6043046);SRVR:DM3PR18MB0842;BCL:0;PCL:0;RULEID:;SRVR:DM3PR18MB0842; x-forefront-prvs: 098291215C x-forefront-antispam-report: SFV:NSPM;SFS:(10019020)(6009001)(7916002)(189002)(199003)(86362001)(2351001)(87936001)(2900100001)(3846002)(77096005)(586003)(6116002)(102836003)(106356001)(2906002)(105586002)(8676002)(1730700003)(92566002)(81166006)(74316001)(99286002)(107886002)(110136002)(33656002)(81156014)(122556002)(80792005)(450100001)(97736004)(9686002)(2501003)(305945005)(7736002)(7846002)(50986999)(5003600100003)(7696003)(189998001)(8936002)(68736007)(5002640100001)(76576001)(10400500002)(3280700002)(3660700001)(66066001)(101416001)(5640700001)(54356999);DIR:OUT;SFP:1102;SCL:1;SRVR:DM3PR18MB0842;H:DM3PR18MB0841.namprd18.prod.outlook.com;FPR:;SPF:None;PTR:InfoNoRecords;MX:1;A:1;LANG:en; received-spf: None (protection.outlook.com: lbmsys.com does not designate permitted sender hosts) spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 X-OriginatorOrg: lbmsys.com X-MS-Exchange-CrossTenant-originalarrivaltime: 23 Jun 2016 12:07:09.8426 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 2cb46dcc-5f81-474e-b16b-96065648dbca X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM3PR18MB0842 X-IsSubscribed: yes Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from base64 to 8bit by delorie.com id u5NC7dEu020021 > > > > > > Here is a "program" that shows the issue I am worried about. It is so > simple > > > > > that I must be overlooking something really obvious: > > > > > > > > > > > > #include > > > > > > #undef FD_SETSIZE > > > > > > #define FD_SETSIZE 256 > > > > > > #include > > > > > > #include > > > > > > > > > > > > main() > > > > > > { > > > > > > fd_set rfds; > > > > > > fprintf(stdout, "FD_SETSIZE=%d\n", FD_SETSIZE); > > > > > > fprintf(stdout, "sizeof(fd_set)=%d\n", sizeof(fd_set)); > > > > > > } > > > > > > > > > > > > Steve Bardwell > > > > > > > > > > For what it's worth, this 'program' works as expected in SUA. The size > > > > of the fd_set changes depending on the value of FD_SETSIZE. > > > > Oh yeah, the inclusion of stdio.h also includes sys/select.h so the > first (default) definition of FD_SETSIZE to 64 rules. In theory it > shouldn't do that so we might have to change it in the newlib headers, > but for th time being, just define FD_SETSIZE before including any > system header. > > > Corinna Brilliant! Thanks so much for figuring this out. Steve Bardwell