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=kNu
	AW0L7H9DyDImLYhD5jPSYwthQckE330Z54mGIfRd/NdQdbeJU1qb9eoLwM4//5Vx
	FTQUzwM008/+U+BlEBaNhwJV9juSrZCn+W8wl4feLfgPjOsajKBzTH3WqE0NClQH
	m6kNmqsFUmQW+H91qkdlVduv18r82AZb2ggt8VCQ=
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=h026YgVja
	+NvUyWAy+959Qpkkcs=; b=d0zIAK1JCt/aftjU6hYSbiW0awFM1egMaH628PqvC
	0QOIys3ya8Y9fOx1VgLaSM1+wpwg8suJ6+JuccfnaN7xt56qpHvhts6rWpMZdJTf
	Psl3by3XeZpRzNVMExdCuaxW/rZwmETd8IcCoZZAl6XFimHJK7qJnDeS3j7STTjr
	5A=
Mailing-List:	contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Id:	<cygwin.cygwin.com>
List-Subscribe:	<mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive:	<http://sourceware.org/ml/cygwin/>
List-Post:	<mailto:cygwin AT cygwin DOT com>
List-Help:	<mailto:cygwin-help AT cygwin DOT com>, <http://sourceware.org/ml/#faqs>
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=BAYES_00,RCVD_IN_DNSWL_NONE,SPF_HELO_PASS,SPF_PASS autolearn=ham version=3.3.2 spammy=Hx-exchange-antispam-report-cfa-test:6040130, Hx-exchange-antispam-report-cfa-test:6043046, Hx-exchange-antispam-report-cfa-test:6041072, H*MI:outlook
X-HELO:	na01-bn1-obe.outbound.protection.outlook.com
From:	Steven Bardwell <SBardwell AT lbmsys DOT com>
To:	"cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
Subject:	FD_SETSIZE and sizeof(fd_set)
Date:	Wed, 22 Jun 2016 22:19:20 +0000
Message-ID:	<DM3PR18MB084148FC4EFA327DA33DB267DB2C0@DM3PR18MB0841.namprd18.prod.outlook.com>
authentication-results:	spf=none (sender IP is ) smtp.mailfrom=SBardwell AT lbmsys DOT com;
x-ms-office365-filtering-correlation-id:	712b0a72-9d49-40f1-3671-08d39aeb4218
x-microsoft-exchange-diagnostics:	1;DM3PR18MB0844;6:Vb2J60Mwk9OVW1kgFRwM269rzixYDfOLa8KMxW18VL39duTp+6nta1ErH4zXVeS4yLLn8C7ipNWDp97YPRqvbXhqpl0Khusyxodt3mPH6XrkCYim/LHDrLQDoF4l1zCK47t2bWVLZABS6SiHIP4+Qci3lNPdQguezi0yUDjV+aZUe5E2mjFelbArissGyy64+0mQpImbi1yYdS6nebaqX5Gr8ukLjS998Vug5BMMLWFprYP3htdvY0LqKsDoDp79Ry2saBkG8RWp8nPgo2nvDdCZzrPxJAGh7b++YsezkX0/0eRpEM47zfWZ2TkZFNooCA3HZEqC5I2OChEt1VrFfQ==;5:09paZeBhOpErLCvXbsUq+Qti2UPMRUS9VV7VkdazaCB7m4nLyhqQDoPqxdgUWoT7R+ZInqVgK8Q86yrOCYIDnMnMnmXzmu8fn39+AxQeVhLz4fcxxUYaJfi5cJwZNlpYR6sBnRyp2owDIz+R8YlqwQ==;24:9UE2FuMR1h0VmEUPWjc6zzqOTWONxyc7xjgI9xGz+TiFHmNTGjVe9kgAIT9UqufwndsDJyrOrYyufRk2jRJlNLvUnwziC89xsz37hPsIJ8I=;7:jl3QPzoPxXW0wu8FAa0bxI+uD6sepcvOFOxMT9RmJ3lIzTBxA5Paa5yG+qEb7sELkZMq+OX8O9e59OGRJ9lFngdBGNfa/ZBkISWUDwYGtFU5fwsnxXxQDU8Iw9hhzlJvEO11uMrmKMFz+VIJ9btSxFv0pkDle7B/VH7sSzHF2iOhO2T9O3J+7W6nTktaKOa1q7Kq+jm3y+eo75ErW9OHkDnSXvivITvRQl5bMFTJnEeShYZCDGDabBpeZ1wpdtZ/jdMpD7xOLAWbzrVbKpl50g==
x-microsoft-antispam:	UriScan:;BCL:0;PCL:0;RULEID:;SRVR:DM3PR18MB0844;
x-microsoft-antispam-prvs:	<DM3PR18MB0844D16A0AA5F326667EE5F1DB2C0 AT DM3PR18MB0844 DOT namprd18 DOT prod DOT outlook DOT com>
x-exchange-antispam-report-test:	UriScan:;
x-exchange-antispam-report-cfa-test:	BCL:0;PCL:0;RULEID:(6040130)(601004)(2401047)(5005006)(8121501046)(10201501046)(3002001)(6041072)(6043046);SRVR:DM3PR18MB0844;BCL:0;PCL:0;RULEID:;SRVR:DM3PR18MB0844;
x-forefront-prvs:	0981815F2F
x-forefront-antispam-report:	SFV:NSPM;SFS:(10019020)(6009001)(7916002)(189002)(199003)(6116002)(2900100001)(50986999)(3660700001)(2501003)(74316001)(2351001)(102836003)(586003)(110136002)(3846002)(122556002)(107886002)(229853001)(92566002)(8936002)(7736002)(305945005)(54356999)(5003600100003)(11100500001)(5640700001)(66066001)(3280700002)(77096005)(2906002)(97736004)(76576001)(87936001)(80792005)(7846002)(189998001)(81166006)(9686002)(86362001)(1730700003)(8676002)(106356001)(99286002)(68736007)(10400500002)(105586002)(33656002)(5002640100001)(450100001)(101416001)(7696003)(81156014);DIR:OUT;SFP:1102;SCL:1;SRVR:DM3PR18MB0844;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
MIME-Version:	1.0
X-OriginatorOrg:	lbmsys.com
X-MS-Exchange-CrossTenant-originalarrivaltime:	22 Jun 2016 22:19:20.4835 (UTC)
X-MS-Exchange-CrossTenant-fromentityheader:	Hosted
X-MS-Exchange-CrossTenant-id:	2cb46dcc-5f81-474e-b16b-96065648dbca
X-MS-Exchange-Transport-CrossTenantHeadersStamped:	DM3PR18MB0844
X-IsSubscribed:	yes
X-MIME-Autoconverted:	from quoted-printable to 8bit by delorie.com id u5MMJjGD009616

I am running into a problem with the fd_set structure that someone may know the answer to. 

I would like to be able to call select() on more than 64 open files, so I have done the following:

1)   the include section of the program has the code:

#undef FD_SETSIZE
#define FD_SETSIZE 256
#include <sys/types.h>

2) however, when I query the size of the fd_set structure, sizeof(fd_set) return 8 bytes. 

This obviously breaks things when the fd is greater than 64.

Is there a proper way of supporting more than 64 open files in a process? I am guessing there is an easy answer -- if not, I can supply sample code that shows the problem.

Steve Bardwell





--
Problem reports:       http://cygwin.com/problems.html
FAQ:                   http://cygwin.com/faq/
Documentation:         http://cygwin.com/docs.html
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple

- Raw text -