[FEEDBACK] Issue with fd_set, FD_ZERO, FD_SET, FD_SETSIZE : Cygwin

Yeo Kai Wei yeokaiwei@hotmail.com
Tue Feb 7 05:21:23 GMT 2023

Hi Eliot,

Thanks for the help.

No pressure.

I only want help from those who are willing to help.

Those who are NOT interested may kindly ignore my messages.

There is no obligation at all.

The issues I highlighted have been a recurring problem on Google.

So, there is a recurring pattern emerging and perhaps this thread could solve it once and for all.

As for what I am using it for, I am trying to complete a book called Modern C.

I wish to finish it.

Thank you.

Kind Regards,
YEO Kai Wei

From: Eliot Moss <moss@cs.umass.edu>
Sent: Tuesday, February 7, 2023 12:46:32 PM
To: Yeo Kai Wei <yeokaiwei@hotmail.com>; gs-cygwin.com@gluelogic.com <gs-cygwin.com@gluelogic.com>
Cc: cygwin@cygwin.com <cygwin@cygwin.com>
Subject: Re: [FEEDBACK] Issue with fd_set, FD_ZERO, FD_SET, FD_SETSIZE : Cygwin

On 2/7/2023 3:28 PM, Yeo Kai Wei wrote:
> On 7/2/2023 9:54 am, Eliot Moss wrote:
>> On 2/7/2023 11:34 AM, Yeo Kai Wei wrote:
>>> On 7/2/2023 7:27 am, Eliot Moss wrote:
>>>> On 2/7/2023 10:03 AM, Yeo Kai Wei via Cygwin wrote:
>>>>> On 7/2/2023 4:59 am, gs-cygwin.com@gluelogic.com wrote:
>>>>>> On Tue, Feb 07, 2023 at 04:33:53AM +0800, Yeo Kai Wei wrote:
>>>>> I updated Cygwin to 3.4.5-1.x86_64.
>>>>> $ uname -a
>>>>> CYGWIN_NT-10.0-19045 DESKTOP-P3E71RB 3.4.5-1.x86_64 2023-01-19 19:09 UTC x86_64 Cygwin
>>>>> However, the same problem occurs.
>>>>> Cygwn-devel doesn't seem to work.
>>>>> $ gcc -o selectStdIn selectStdIn.c
>>>>> selectStdIn.c:9:10: fatal error: sys/select.h: No such file or directory
>>>>>   #include <sys/select.h>
>>>>>            ^~~~~~~~~~~~~~
>>>>> compilation terminated.
>>>> Well, on my system cygcheck -f /usr/include/sys/select.h clearly says
>>>> that the file came from cygwin-devel-3.4.3-1.  Maybe you misspelled
>>>> cygwin-devel ?  You do have to select the package explicitly, too.
>>>> EM
>>> Hi Eliot,
>>> I just reinstalled Cygwin but I'm unsure of what I missed.
>>> I did "cygcheck -f /usr/include/sys/select.h" and it seems to tell me that I do have
>>> cygwin-devel-3.4.5-1
>>> Did I miss a step?
>> What gcc are you running?  Maybe not cygwin's?
>> EM
> Hi Eliot,
> I think I'm running MinGW's gcc.
> I typed in "gcc --version" and this is what Cygwin returned.
> $ gcc --version
> gcc.exe (x86_64-posix-seh-rev0, Built by MinGW-W64 project) 8.1.0
> Copyright (C) 2018 Free Software Foundation, Inc.
> This is free software; see the source for copying conditions. There is NO
> What should I do next?

Install the relevant gcc and program building packages.
But I think you're reaching the limit of the handholding
the community may be prepared to offer ...

Also, you never said what you're *really* trying to


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