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

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

[Yeo Kai Wei]

[-- Attachment #1: Type: text/plain, Size: 2125 bytes --]

Hi,

I would like to report an issue with Cygwin 3.4.2 on Windows.

It doesn't seem to be able to work with  fd_set, FD_ZERO, FD_SET, 
FD_SETSIZE macros.

The code is in italics. The filename was selectStdIn.c. The terminal 
command used was "gcc -o selectStdIn selectStdIn.c"

Thank you.

/
/

/CODE
/

/#include <stdio.h>//
//#include <stdlib.h>//
//#include <sys/time.h>//
//#include <unistd.h>//
/ /
//void main()//
//{//
//    fd_set fds; //set of file descriptors//
/ /
//    struct timeval tv;//
/ /
//    int flag;//
/ /
//    char byte;//
/ /
//    FD_ZERO(&fds);//
/ /
//    FD_SET(0, &fds);//
/ /
//    tv.tv_sec = 5;//
/ /
//    tv.tv_usec = 0;//
/ /
//    flag = select(FD_SETSIZE, //
//            &fds,//
//            NULL,//
//            NULL,//
//            &tv);//
/ /
//    if(-1 == flag)//
//        perror("select error");//
//    else if(flag)//
//    {//
//        read(0,&byte,1);//
/ /
//        puts("data read");//
//    }//
/ /
//    if(flag)//
//        printf("The byte value is %c\n", byte);//
////
//}/


TERMINAL COMMANDS

$ gcc -o selectStdIn selectStdIn.c
selectStdIn.c: In function 'main':
selectStdIn.c:8:2: error: unknown type name 'fd_set'; did you mean 'fpos_t'?
   fd_set fds; //set of file descriptors
   ^~~~~~
   fpos_t
selectStdIn.c:16:2: warning: implicit declaration of function 'FD_ZERO' 
[-Wimpli
cit-function-declaration]
   FD_ZERO(&fds);
   ^~~~~~~
selectStdIn.c:18:2: warning: implicit declaration of function 'FD_SET' 
[-Wimplic
it-function-declaration]
   FD_SET(0, &fds);
   ^~~~~~
selectStdIn.c:24:9: warning: implicit declaration of function 'select'; 
did you
mean 'sleep'? [-Wimplicit-function-declaration]
   flag = select(FD_SETSIZE,
          ^~~~~~
          sleep
selectStdIn.c:24:16: error: 'FD_SETSIZE' undeclared (first use in this 
function)
   flag = select(FD_SETSIZE,
                 ^~~~~~~~~~
selectStdIn.c:24:16: note: each undeclared identifier is reported only 
once for
each function it appears in

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

[gs-cygwin.com]

On Tue, Feb 07, 2023 at 04:25:22AM +0800, Yeo Kai Wei via Cygwin wrote:
> Hi,
> 
> I would like to report an issue with Cygwin 3.4.2 on Windows.
> 
> It doesn't seem to be able to work with  fd_set, FD_ZERO, FD_SET, FD_SETSIZE
> macros.
> 
> The code is in italics. The filename was selectStdIn.c. The terminal command
> used was "gcc -o selectStdIn selectStdIn.c"
> 
> Thank you.
> 
> /
> /
> 
> /CODE
> /
> 
> /#include <stdio.h>//
> //#include <stdlib.h>//
> //#include <sys/time.h>//
> //#include <unistd.h>//
> / /
> //void main()//
> //{//
> //    fd_set fds; //set of file descriptors//
> / /
> //    struct timeval tv;//
> / /
> //    int flag;//
> / /
> //    char byte;//
> / /
> //    FD_ZERO(&fds);//
> / /
> //    FD_SET(0, &fds);//
> / /
> //    tv.tv_sec = 5;//
> / /
> //    tv.tv_usec = 0;//
> / /
> //    flag = select(FD_SETSIZE, //
> //            &fds,//
> //            NULL,//
> //            NULL,//
> //            &tv);//
> / /
> //    if(-1 == flag)//
> //        perror("select error");//
> //    else if(flag)//
> //    {//
> //        read(0,&byte,1);//
> / /
> //        puts("data read");//
> //    }//
> / /
> //    if(flag)//
> //        printf("The byte value is %c\n", byte);//
> ////
> //}/
> 
> 
> TERMINAL COMMANDS
> 
> $ gcc -o selectStdIn selectStdIn.c
> selectStdIn.c: In function 'main':
> selectStdIn.c:8:2: error: unknown type name 'fd_set'; did you mean 'fpos_t'?
>   fd_set fds; //set of file descriptors
>   ^~~~~~
>   fpos_t
> selectStdIn.c:16:2: warning: implicit declaration of function 'FD_ZERO'
> [-Wimpli
> cit-function-declaration]
>   FD_ZERO(&fds);
>   ^~~~~~~
> selectStdIn.c:18:2: warning: implicit declaration of function 'FD_SET'
> [-Wimplic
> it-function-declaration]
>   FD_SET(0, &fds);
>   ^~~~~~
> selectStdIn.c:24:9: warning: implicit declaration of function 'select'; did
> you
> mean 'sleep'? [-Wimplicit-function-declaration]
>   flag = select(FD_SETSIZE,
>          ^~~~~~
>          sleep
> selectStdIn.c:24:16: error: 'FD_SETSIZE' undeclared (first use in this
> function)
>   flag = select(FD_SETSIZE,
>                 ^~~~~~~~~~
> selectStdIn.c:24:16: note: each undeclared identifier is reported only once
> for
> each function it appears in

$ man select

#include <sys/select.h>

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

[Yeo Kai Wei]

Hi All,

Thanks for the help.

I tried adding "#include <sys/select.h>".

However, this is the error message that was returned to me.

$ gcc -o selectStdIn selectStdIn.c
selectStdIn.c:9:10: fatal error: sys/select.h: No such file or directory
  #include <sys/select.h>

Thank you.

On 7/2/2023 4:30 am, gs-cygwin.com@gluelogic.com wrote:
> On Tue, Feb 07, 2023 at 04:25:22AM +0800, Yeo Kai Wei via Cygwin wrote:
>> Hi,
>>
>> I would like to report an issue with Cygwin 3.4.2 on Windows.
>>
>> It doesn't seem to be able to work with  fd_set, FD_ZERO, FD_SET, FD_SETSIZE
>> macros.
>>
>> The code is in italics. The filename was selectStdIn.c. The terminal command
>> used was "gcc -o selectStdIn selectStdIn.c"
>>
>> Thank you.
>>
>> /
>> /
>>
>> /CODE
>> /
>>
>> /#include <stdio.h>//
>> //#include <stdlib.h>//
>> //#include <sys/time.h>//
>> //#include <unistd.h>//
>> / /
>> //void main()//
>> //{//
>> //    fd_set fds; //set of file descriptors//
>> / /
>> //    struct timeval tv;//
>> / /
>> //    int flag;//
>> / /
>> //    char byte;//
>> / /
>> //    FD_ZERO(&fds);//
>> / /
>> //    FD_SET(0, &fds);//
>> / /
>> //    tv.tv_sec = 5;//
>> / /
>> //    tv.tv_usec = 0;//
>> / /
>> //    flag = select(FD_SETSIZE, //
>> //            &fds,//
>> //            NULL,//
>> //            NULL,//
>> //            &tv);//
>> / /
>> //    if(-1 == flag)//
>> //        perror("select error");//
>> //    else if(flag)//
>> //    {//
>> //        read(0,&byte,1);//
>> / /
>> //        puts("data read");//
>> //    }//
>> / /
>> //    if(flag)//
>> //        printf("The byte value is %c\n", byte);//
>> ////
>> //}/
>>
>>
>> TERMINAL COMMANDS
>>
>> $ gcc -o selectStdIn selectStdIn.c
>> selectStdIn.c: In function 'main':
>> selectStdIn.c:8:2: error: unknown type name 'fd_set'; did you mean 'fpos_t'?
>>    fd_set fds; //set of file descriptors
>>    ^~~~~~
>>    fpos_t
>> selectStdIn.c:16:2: warning: implicit declaration of function 'FD_ZERO'
>> [-Wimpli
>> cit-function-declaration]
>>    FD_ZERO(&fds);
>>    ^~~~~~~
>> selectStdIn.c:18:2: warning: implicit declaration of function 'FD_SET'
>> [-Wimplic
>> it-function-declaration]
>>    FD_SET(0, &fds);
>>    ^~~~~~
>> selectStdIn.c:24:9: warning: implicit declaration of function 'select'; did
>> you
>> mean 'sleep'? [-Wimplicit-function-declaration]
>>    flag = select(FD_SETSIZE,
>>           ^~~~~~
>>           sleep
>> selectStdIn.c:24:16: error: 'FD_SETSIZE' undeclared (first use in this
>> function)
>>    flag = select(FD_SETSIZE,
>>                  ^~~~~~~~~~
>> selectStdIn.c:24:16: note: each undeclared identifier is reported only once
>> for
>> each function it appears in
> $ man select
>
> #include <sys/select.h>

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

[gs-cygwin.com]

On Tue, Feb 07, 2023 at 04:33:53AM +0800, Yeo Kai Wei wrote:
> Hi All,
> 
> Thanks for the help.
> 
> I tried adding "#include <sys/select.h>".
> 
> However, this is the error message that was returned to me.
> 
> $ gcc -o selectStdIn selectStdIn.c
> selectStdIn.c:9:10: fatal error: sys/select.h: No such file or directory
>  #include <sys/select.h>
> 
> Thank you.
> 
> On 7/2/2023 4:30 am, gs-cygwin.com@gluelogic.com wrote:
> > On Tue, Feb 07, 2023 at 04:25:22AM +0800, Yeo Kai Wei via Cygwin wrote:
> > > Hi,
> > > 
> > > I would like to report an issue with Cygwin 3.4.2 on Windows.
> > > 
> > > It doesn't seem to be able to work with  fd_set, FD_ZERO, FD_SET, FD_SETSIZE
> > > macros.
> > > 
> > > The code is in italics. The filename was selectStdIn.c. The terminal command
> > > used was "gcc -o selectStdIn selectStdIn.c"
> > > 
> > > Thank you.
> > > 
> > > /
> > > /
> > > 
> > > /CODE
> > > /
> > > 
> > > /#include <stdio.h>//
> > > //#include <stdlib.h>//
> > > //#include <sys/time.h>//
> > > //#include <unistd.h>//
> > > / /
> > > //void main()//
> > > //{//
> > > //    fd_set fds; //set of file descriptors//
> > > / /
> > > //    struct timeval tv;//
> > > / /
> > > //    int flag;//
> > > / /
> > > //    char byte;//
> > > / /
> > > //    FD_ZERO(&fds);//
> > > / /
> > > //    FD_SET(0, &fds);//
> > > / /
> > > //    tv.tv_sec = 5;//
> > > / /
> > > //    tv.tv_usec = 0;//
> > > / /
> > > //    flag = select(FD_SETSIZE, //
> > > //            &fds,//
> > > //            NULL,//
> > > //            NULL,//
> > > //            &tv);//
> > > / /
> > > //    if(-1 == flag)//
> > > //        perror("select error");//
> > > //    else if(flag)//
> > > //    {//
> > > //        read(0,&byte,1);//
> > > / /
> > > //        puts("data read");//
> > > //    }//
> > > / /
> > > //    if(flag)//
> > > //        printf("The byte value is %c\n", byte);//
> > > ////
> > > //}/
> > > 
> > > 
> > > TERMINAL COMMANDS
> > > 
> > > $ gcc -o selectStdIn selectStdIn.c
> > > selectStdIn.c: In function 'main':
> > > selectStdIn.c:8:2: error: unknown type name 'fd_set'; did you mean 'fpos_t'?
> > >    fd_set fds; //set of file descriptors
> > >    ^~~~~~
> > >    fpos_t
> > > selectStdIn.c:16:2: warning: implicit declaration of function 'FD_ZERO'
> > > [-Wimpli
> > > cit-function-declaration]
> > >    FD_ZERO(&fds);
> > >    ^~~~~~~
> > > selectStdIn.c:18:2: warning: implicit declaration of function 'FD_SET'
> > > [-Wimplic
> > > it-function-declaration]
> > >    FD_SET(0, &fds);
> > >    ^~~~~~
> > > selectStdIn.c:24:9: warning: implicit declaration of function 'select'; did
> > > you
> > > mean 'sleep'? [-Wimplicit-function-declaration]
> > >    flag = select(FD_SETSIZE,
> > >           ^~~~~~
> > >           sleep
> > > selectStdIn.c:24:16: error: 'FD_SETSIZE' undeclared (first use in this
> > > function)
> > >    flag = select(FD_SETSIZE,
> > >                  ^~~~~~~~~~
> > > selectStdIn.c:24:16: note: each undeclared identifier is reported only once
> > > for
> > > each function it appears in
> > $ man select
> > 
> > #include <sys/select.h>

Please post at bottom of messages on this mailing list.

You need to install the cygwin-devel package to get <sys/select.h>

Cheers, Glenn

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

[Yeo Kai Wei]

[-- Attachment #1: Type: text/plain, Size: 3703 bytes --]


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:
>> Hi All,
>>
>> Thanks for the help.
>>
>> I tried adding "#include <sys/select.h>".
>>
>> However, this is the error message that was returned to me.
>>
>> $ gcc -o selectStdIn selectStdIn.c
>> selectStdIn.c:9:10: fatal error: sys/select.h: No such file or directory
>>   #include <sys/select.h>
>>
>> Thank you.
>>
>> On 7/2/2023 4:30 am,gs-cygwin.com@gluelogic.com  wrote:
>>> On Tue, Feb 07, 2023 at 04:25:22AM +0800, Yeo Kai Wei via Cygwin wrote:
>>>> Hi,
>>>>
>>>> I would like to report an issue with Cygwin 3.4.2 on Windows.
>>>>
>>>> It doesn't seem to be able to work with  fd_set, FD_ZERO, FD_SET, FD_SETSIZE
>>>> macros.
>>>>
>>>> The code is in italics. The filename was selectStdIn.c. The terminal command
>>>> used was "gcc -o selectStdIn selectStdIn.c"
>>>>
>>>> Thank you.
>>>>
>>>> /
>>>> /
>>>>
>>>> /CODE
>>>> /
>>>>
>>>> /#include <stdio.h>//
>>>> //#include <stdlib.h>//
>>>> //#include <sys/time.h>//
>>>> //#include <unistd.h>//
>>>> / /
>>>> //void main()//
>>>> //{//
>>>> //    fd_set fds; //set of file descriptors//
>>>> / /
>>>> //    struct timeval tv;//
>>>> / /
>>>> //    int flag;//
>>>> / /
>>>> //    char byte;//
>>>> / /
>>>> //    FD_ZERO(&fds);//
>>>> / /
>>>> //    FD_SET(0, &fds);//
>>>> / /
>>>> //    tv.tv_sec = 5;//
>>>> / /
>>>> //    tv.tv_usec = 0;//
>>>> / /
>>>> //    flag = select(FD_SETSIZE, //
>>>> //            &fds,//
>>>> //            NULL,//
>>>> //            NULL,//
>>>> //            &tv);//
>>>> / /
>>>> //    if(-1 == flag)//
>>>> //        perror("select error");//
>>>> //    else if(flag)//
>>>> //    {//
>>>> //        read(0,&byte,1);//
>>>> / /
>>>> //        puts("data read");//
>>>> //    }//
>>>> / /
>>>> //    if(flag)//
>>>> //        printf("The byte value is %c\n", byte);//
>>>> ////
>>>> //}/
>>>>
>>>>
>>>> TERMINAL COMMANDS
>>>>
>>>> $ gcc -o selectStdIn selectStdIn.c
>>>> selectStdIn.c: In function 'main':
>>>> selectStdIn.c:8:2: error: unknown type name 'fd_set'; did you mean 'fpos_t'?
>>>>     fd_set fds; //set of file descriptors
>>>>     ^~~~~~
>>>>     fpos_t
>>>> selectStdIn.c:16:2: warning: implicit declaration of function 'FD_ZERO'
>>>> [-Wimpli
>>>> cit-function-declaration]
>>>>     FD_ZERO(&fds);
>>>>     ^~~~~~~
>>>> selectStdIn.c:18:2: warning: implicit declaration of function 'FD_SET'
>>>> [-Wimplic
>>>> it-function-declaration]
>>>>     FD_SET(0, &fds);
>>>>     ^~~~~~
>>>> selectStdIn.c:24:9: warning: implicit declaration of function 'select'; did
>>>> you
>>>> mean 'sleep'? [-Wimplicit-function-declaration]
>>>>     flag = select(FD_SETSIZE,
>>>>            ^~~~~~
>>>>            sleep
>>>> selectStdIn.c:24:16: error: 'FD_SETSIZE' undeclared (first use in this
>>>> function)
>>>>     flag = select(FD_SETSIZE,
>>>>                   ^~~~~~~~~~
>>>> selectStdIn.c:24:16: note: each undeclared identifier is reported only once
>>>> for
>>>> each function it appears in
>>> $ man select
>>>
>>> #include <sys/select.h>
> Please post at bottom of messages on this mailing list.
>
> You need to install the cygwin-devel package to get <sys/select.h>
>
> Cheers, Glenn

Hi All,

Thanks for the help.

Is this the correct link?

https://www.cygwin.com/packages/summary/cygwin-devel.html

I assume I should download the following

3.4.5-1 	310 KiB 	2023-01-19 19:25 	[list of files 
<https://www.cygwin.com/packages/x86_64/cygwin-devel/cygwin-devel-3.4.5-1>] 
	stable


Thank you very much.


Kind Regards,

YEO Kai Wei

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

[Yeo Kai Wei]

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:
>> Hi All,
>>
>> Thanks for the help.
>>
>> I tried adding "#include <sys/select.h>".
>>
>> However, this is the error message that was returned to me.
>>
>> $ gcc -o selectStdIn selectStdIn.c
>> selectStdIn.c:9:10: fatal error: sys/select.h: No such file or directory
>>   #include <sys/select.h>
>>
>> Thank you.
>>
>> On 7/2/2023 4:30 am, gs-cygwin.com@gluelogic.com wrote:
>>> On Tue, Feb 07, 2023 at 04:25:22AM +0800, Yeo Kai Wei via Cygwin wrote:
>>>> Hi,
>>>>
>>>> I would like to report an issue with Cygwin 3.4.2 on Windows.
>>>>
>>>> It doesn't seem to be able to work with  fd_set, FD_ZERO, FD_SET, FD_SETSIZE
>>>> macros.
>>>>
>>>> The code is in italics. The filename was selectStdIn.c. The terminal command
>>>> used was "gcc -o selectStdIn selectStdIn.c"
>>>>
>>>> Thank you.
>>>>
>>>> /
>>>> /
>>>>
>>>> /CODE
>>>> /
>>>>
>>>> /#include <stdio.h>//
>>>> //#include <stdlib.h>//
>>>> //#include <sys/time.h>//
>>>> //#include <unistd.h>//
>>>> / /
>>>> //void main()//
>>>> //{//
>>>> //    fd_set fds; //set of file descriptors//
>>>> / /
>>>> //    struct timeval tv;//
>>>> / /
>>>> //    int flag;//
>>>> / /
>>>> //    char byte;//
>>>> / /
>>>> //    FD_ZERO(&fds);//
>>>> / /
>>>> //    FD_SET(0, &fds);//
>>>> / /
>>>> //    tv.tv_sec = 5;//
>>>> / /
>>>> //    tv.tv_usec = 0;//
>>>> / /
>>>> //    flag = select(FD_SETSIZE, //
>>>> //            &fds,//
>>>> //            NULL,//
>>>> //            NULL,//
>>>> //            &tv);//
>>>> / /
>>>> //    if(-1 == flag)//
>>>> //        perror("select error");//
>>>> //    else if(flag)//
>>>> //    {//
>>>> //        read(0,&byte,1);//
>>>> / /
>>>> //        puts("data read");//
>>>> //    }//
>>>> / /
>>>> //    if(flag)//
>>>> //        printf("The byte value is %c\n", byte);//
>>>> ////
>>>> //}/
>>>>
>>>>
>>>> TERMINAL COMMANDS
>>>>
>>>> $ gcc -o selectStdIn selectStdIn.c
>>>> selectStdIn.c: In function 'main':
>>>> selectStdIn.c:8:2: error: unknown type name 'fd_set'; did you mean 'fpos_t'?
>>>>     fd_set fds; //set of file descriptors
>>>>     ^~~~~~
>>>>     fpos_t
>>>> selectStdIn.c:16:2: warning: implicit declaration of function 'FD_ZERO'
>>>> [-Wimpli
>>>> cit-function-declaration]
>>>>     FD_ZERO(&fds);
>>>>     ^~~~~~~
>>>> selectStdIn.c:18:2: warning: implicit declaration of function 'FD_SET'
>>>> [-Wimplic
>>>> it-function-declaration]
>>>>     FD_SET(0, &fds);
>>>>     ^~~~~~
>>>> selectStdIn.c:24:9: warning: implicit declaration of function 'select'; did
>>>> you
>>>> mean 'sleep'? [-Wimplicit-function-declaration]
>>>>     flag = select(FD_SETSIZE,
>>>>            ^~~~~~
>>>>            sleep
>>>> selectStdIn.c:24:16: error: 'FD_SETSIZE' undeclared (first use in this
>>>> function)
>>>>     flag = select(FD_SETSIZE,
>>>>                   ^~~~~~~~~~
>>>> selectStdIn.c:24:16: note: each undeclared identifier is reported only once
>>>> for
>>>> each function it appears in
>>> $ man select
>>>
>>> #include <sys/select.h>
> Please post at bottom of messages on this mailing list.
>
> You need to install the cygwin-devel package to get <sys/select.h>
>
> Cheers, Glenn

Hi All,

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.

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

[gs-cygwin.com]

On Tue, Feb 07, 2023 at 07:03:23AM +0800, Yeo Kai Wei 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:
> > > Hi All,
> > > 
> > > Thanks for the help.
> > > 
> > > I tried adding "#include <sys/select.h>".
> > > 
> > > However, this is the error message that was returned to me.
> > > 
> > > $ gcc -o selectStdIn selectStdIn.c
> > > selectStdIn.c:9:10: fatal error: sys/select.h: No such file or directory
> > >   #include <sys/select.h>
> > > 
> > > Thank you.
> > > 
> > > On 7/2/2023 4:30 am, gs-cygwin.com@gluelogic.com wrote:
> > > > On Tue, Feb 07, 2023 at 04:25:22AM +0800, Yeo Kai Wei via Cygwin wrote:
> > > > > Hi,
> > > > > 
> > > > > I would like to report an issue with Cygwin 3.4.2 on Windows.
> > > > > 
> > > > > It doesn't seem to be able to work with  fd_set, FD_ZERO, FD_SET, FD_SETSIZE
> > > > > macros.
> > > > > 
> > > > > The code is in italics. The filename was selectStdIn.c. The terminal command
> > > > > used was "gcc -o selectStdIn selectStdIn.c"
> > > > > 
> > > > > Thank you.
> > > > > 
> > > > > /
> > > > > /
> > > > > 
> > > > > /CODE
> > > > > /
> > > > > 
> > > > > /#include <stdio.h>//
> > > > > //#include <stdlib.h>//
> > > > > //#include <sys/time.h>//
> > > > > //#include <unistd.h>//
> > > > > / /
> > > > > //void main()//
> > > > > //{//
> > > > > //    fd_set fds; //set of file descriptors//
> > > > > / /
> > > > > //    struct timeval tv;//
> > > > > / /
> > > > > //    int flag;//
> > > > > / /
> > > > > //    char byte;//
> > > > > / /
> > > > > //    FD_ZERO(&fds);//
> > > > > / /
> > > > > //    FD_SET(0, &fds);//
> > > > > / /
> > > > > //    tv.tv_sec = 5;//
> > > > > / /
> > > > > //    tv.tv_usec = 0;//
> > > > > / /
> > > > > //    flag = select(FD_SETSIZE, //
> > > > > //            &fds,//
> > > > > //            NULL,//
> > > > > //            NULL,//
> > > > > //            &tv);//
> > > > > / /
> > > > > //    if(-1 == flag)//
> > > > > //        perror("select error");//
> > > > > //    else if(flag)//
> > > > > //    {//
> > > > > //        read(0,&byte,1);//
> > > > > / /
> > > > > //        puts("data read");//
> > > > > //    }//
> > > > > / /
> > > > > //    if(flag)//
> > > > > //        printf("The byte value is %c\n", byte);//
> > > > > ////
> > > > > //}/
> > > > > 
> > > > > 
> > > > > TERMINAL COMMANDS
> > > > > 
> > > > > $ gcc -o selectStdIn selectStdIn.c
> > > > > selectStdIn.c: In function 'main':
> > > > > selectStdIn.c:8:2: error: unknown type name 'fd_set'; did you mean 'fpos_t'?
> > > > >     fd_set fds; //set of file descriptors
> > > > >     ^~~~~~
> > > > >     fpos_t
> > > > > selectStdIn.c:16:2: warning: implicit declaration of function 'FD_ZERO'
> > > > > [-Wimpli
> > > > > cit-function-declaration]
> > > > >     FD_ZERO(&fds);
> > > > >     ^~~~~~~
> > > > > selectStdIn.c:18:2: warning: implicit declaration of function 'FD_SET'
> > > > > [-Wimplic
> > > > > it-function-declaration]
> > > > >     FD_SET(0, &fds);
> > > > >     ^~~~~~
> > > > > selectStdIn.c:24:9: warning: implicit declaration of function 'select'; did
> > > > > you
> > > > > mean 'sleep'? [-Wimplicit-function-declaration]
> > > > >     flag = select(FD_SETSIZE,
> > > > >            ^~~~~~
> > > > >            sleep
> > > > > selectStdIn.c:24:16: error: 'FD_SETSIZE' undeclared (first use in this
> > > > > function)
> > > > >     flag = select(FD_SETSIZE,
> > > > >                   ^~~~~~~~~~
> > > > > selectStdIn.c:24:16: note: each undeclared identifier is reported only once
> > > > > for
> > > > > each function it appears in
> > > > $ man select
> > > > 
> > > > #include <sys/select.h>
> > Please post at bottom of messages on this mailing list.
> > 
> > You need to install the cygwin-devel package to get <sys/select.h>
> > 
> > Cheers, Glenn
> 
> Hi All,
> 
> 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.

https://www.cygwin.com/packages/x86_64/cygwin-devel/cygwin-devel-3.4.5-1

/usr/include/sys/select.h is included in the cygwin-devel package.

Did you install the cygwin-devel package?
Does /usr/include/sys/select.h exist in your cygwin environment?

Perhaps you accidentally have multiple cygwin installations on your
system and you installed cygwin-devel into a different location?

Since you did not have the cygwin-devel package installed on your
system, you are likely very new to developing on cygwin.  You also seem
to be very new to cygwin and installing cygwin packages.

You may want to spend more time reading the available documentation on
how to use cygwin and develop on cygwin, as you seem to be having
trouble with some very elementary steps.  https://www.cygwin.com/
The documentation is very good.  Please read through it.

(This is my way of saying I won't be responding further to this thread.)

Cheers, Glenn

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

[Eliot Moss]

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

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

[Yeo Kai Wei]

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,

Thanks for the help.

There's probably some error somewhere.

I'll just uninstall the whole thing and reinstall from scratch.

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

[Eliot Moss]

On 2/7/2023 10:48 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,
> 
> Thanks for the help.
> 
> There's probably some error somewhere.
> 
> I'll just uninstall the whole thing and reinstall from scratch.

Well, sometimes that's best, but between the other responses and mine,
I suspect you're not actually selecting and downloading cygwin-devel.

It could be problematic if you've installed cygwin in more than one
place, perhaps without realizing it ...  Pay attention to what the
cygwin root directory is for your installation :-) ...

Best - EM

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

[Yeo Kai Wei]

On 7/2/2023 7:50 am, Eliot Moss wrote:
> On 2/7/2023 10:48 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,
>>
>> Thanks for the help.
>>
>> There's probably some error somewhere.
>>
>> I'll just uninstall the whole thing and reinstall from scratch.
>
> Well, sometimes that's best, but between the other responses and mine,
> I suspect you're not actually selecting and downloading cygwin-devel.
>
> It could be problematic if you've installed cygwin in more than one
> place, perhaps without realizing it ...  Pay attention to what the
> cygwin root directory is for your installation :-) ...
>
> Best - EM

Hi Eliot,

I think I made that mistake.

I installed to C:\cygwin but I updated to C:\Desktop.

To prevent any issues, I'll just reinstall from scratch.

Another reason is that extracting the file.tar.xz files results in some 
administrator right issues.

So, I'll just make sure it's a clean install, no merge errors or missing 
files.

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

[Eliot Moss]

On 2/7/2023 11:21 AM, Yeo Kai Wei wrote:
> 
> On 7/2/2023 7:50 am, Eliot Moss wrote:
>> On 2/7/2023 10:48 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:

What you showed says nothing about which packages you've installed.

Do you realize cygwin is not a single thing, but a base library
plus a huge collection of packages from which you need to choose?
(And don't choose them all - that's huge and unnecessary.  You
can install things incrementally as you need them.)

Best - EM

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

[Yeo Kai Wei]

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?


$ 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.

$ uname -a
CYGWIN_NT-10.0-19045 DESKTOP-P3E71RB 3.4.5-1.x86_64 2023-01-19 19:09 UTC 
x86_64 Cygwin

$ cygcheck -f /usr/include/sys/select.h
cygwin-devel-3.4.5-1

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

[Eliot Moss]

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

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

[Yeo Kai Wei]

[-- Attachment #1: Type: text/plain, Size: 1652 bytes --]

I thought it was the Cygwin GCC.

How do I check?


________________________________
From: Eliot Moss <moss@cs.umass.edu>
Sent: Tuesday, February 7, 2023 9:54:33 AM
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 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

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

[Yeo Kai Wei]

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 used "cygcheck -cd" to show all the packages I have.

I can see "cygwin-devel         3.4.5-1".


$ cygcheck -cd
Cygwin Package Information
Package              Version
_autorebase          001091-1
alternatives         1.3.30c-10
base-cygwin          3.8-2
base-files           4.3-3
bash                 4.4.12-3
bzip2                1.0.8-1
ca-certificates      2022.2.54-3
coreutils            9.0-1
crypto-policies      20190218-1
cygutils             1.4.17-1
cygwin               3.4.5-1
cygwin-devel         3.4.5-1
dash                 0.5.12-1
diffutils            3.9-1
editrights           1.03-1
file                 5.44-1
findutils            4.9.0-1
gawk                 5.2.1-2
getent               2.18.90-5
grep                 3.8-2
groff                1.22.4-1
gzip                 1.12-1
hostname             3.13-1
info                 7.0.2-1
ipc-utils            1.0-2
less                 590-1
libargp              20110921-3
libattr1             2.5.1-1.20.g0981a7bfe487
libblkid1            2.33.1-2
libbz2_1             1.0.8-1
libfdisk1            2.33.1-2
libffi6              3.2.1-2
libgcc1              11.3.0-1
libgdbm6             1.18.1-1
libgmp10             6.2.1-2
libiconv2            1.17-1
libintl8             0.21.1-2
liblz4_1             1.9.4-1
liblzma5             5.4.1-1
libmpfr6             4.2.0-1
libncursesw10        6.3-1.20220416
libp11-kit0          0.23.20-1
libpcre2_8_0         10.42-1
libpipeline1         1.5.6-1
libpopt-common       1.18-1
libpopt0             1.18-1
libreadline7         8.2-2
libsigsegv2          2.10-2
libsmartcols1        2.33.1-2
libssl1.1            1.1.1s-1
libstdc++6           11.3.0-1
libtasn1_6           4.14-1
libuuid1             2.33.1-2
libzstd1             1.5.2-1
login                1.13-1
man-db               2.11.2-1
mintty               3.6.3-1
ncurses              6.3-1.20220416
openssl              1.1.1s-1
p11-kit              0.23.20-1
p11-kit-trust        0.23.20-1
rebase               4.6.2-2
run                  1.3.4-2
sed                  4.9-1
tar                  1.34-1
terminfo             6.3-1.20220416
terminfo-extra       6.3-1.20220416
tzcode               2022g-1
tzdata               2022g-1
util-linux           2.33.1-2
vim-minimal          8.2.4372-1
which                2.20-2
xz                   5.4.1-1
zlib0                1.2.13-1
zstd                 1.5.2-1


Additionally, what packages do I need to download for the following?


$ gcc -o basicFork basicFork.c
basicFork.c: In function 'main':
basicFork.c:14:9: error: 'SIGCHILD' undeclared (first use in this 
function); did
  you mean 'SIGILL'?
   signal(SIGCHILD, SIG_IGN);
          ^~~~~~~~
          SIGILL
basicFork.c:14:9: note: each undeclared identifier is reported only once 
for eac
h function it appears in
basicFork.c:19:14: warning: implicit declaration of function 'fork' 
[-Wimplicit-
function-declaration]
   pid_t pid = fork();



Thank you.


Kind Regards,

YEO Kai Wei

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

[Eliot Moss]

On 2/7/2023 2:56 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 used "cygcheck -cd" to show all the packages I have.
> 
> I can see "cygwin-devel         3.4.5-1".
> 
> 
> $ cygcheck -cd
> Cygwin Package Information
> Package              Version
> _autorebase          001091-1
> alternatives         1.3.30c-10
> base-cygwin          3.8-2
> base-files           4.3-3
> bash                 4.4.12-3
> bzip2                1.0.8-1
> ca-certificates      2022.2.54-3
> coreutils            9.0-1
> crypto-policies      20190218-1
> cygutils             1.4.17-1
> cygwin               3.4.5-1
> cygwin-devel         3.4.5-1
> dash                 0.5.12-1
> diffutils            3.9-1
> editrights           1.03-1
> file                 5.44-1
> findutils            4.9.0-1
> gawk                 5.2.1-2
> getent               2.18.90-5
> grep                 3.8-2
> groff                1.22.4-1
> gzip                 1.12-1
> hostname             3.13-1
> info                 7.0.2-1
> ipc-utils            1.0-2
> less                 590-1
> libargp              20110921-3
> libattr1             2.5.1-1.20.g0981a7bfe487
> libblkid1            2.33.1-2
> libbz2_1             1.0.8-1
> libfdisk1            2.33.1-2
> libffi6              3.2.1-2
> libgcc1              11.3.0-1
> libgdbm6             1.18.1-1
> libgmp10             6.2.1-2
> libiconv2            1.17-1
> libintl8             0.21.1-2
> liblz4_1             1.9.4-1
> liblzma5             5.4.1-1
> libmpfr6             4.2.0-1
> libncursesw10        6.3-1.20220416
> libp11-kit0          0.23.20-1
> libpcre2_8_0         10.42-1
> libpipeline1         1.5.6-1
> libpopt-common       1.18-1
> libpopt0             1.18-1
> libreadline7         8.2-2
> libsigsegv2          2.10-2
> libsmartcols1        2.33.1-2
> libssl1.1            1.1.1s-1
> libstdc++6           11.3.0-1
> libtasn1_6           4.14-1
> libuuid1             2.33.1-2
> libzstd1             1.5.2-1
> login                1.13-1
> man-db               2.11.2-1
> mintty               3.6.3-1
> ncurses              6.3-1.20220416
> openssl              1.1.1s-1
> p11-kit              0.23.20-1
> p11-kit-trust        0.23.20-1
> rebase               4.6.2-2
> run                  1.3.4-2
> sed                  4.9-1
> tar                  1.34-1
> terminfo             6.3-1.20220416
> terminfo-extra       6.3-1.20220416
> tzcode               2022g-1
> tzdata               2022g-1
> util-linux           2.33.1-2
> vim-minimal          8.2.4372-1
> which                2.20-2
> xz                   5.4.1-1
> zlib0                1.2.13-1
> zstd                 1.5.2-1
> 
> 
> Additionally, what packages do I need to download for the following?
> 
> 
> $ gcc -o basicFork basicFork.c
> basicFork.c: In function 'main':
> basicFork.c:14:9: error: 'SIGCHILD' undeclared (first use in this function); did
>   you mean 'SIGILL'?
>    signal(SIGCHILD, SIG_IGN);
>           ^~~~~~~~
>           SIGILL
> basicFork.c:14:9: note: each undeclared identifier is reported only once for eac
> h function it appears in
> basicFork.c:19:14: warning: implicit declaration of function 'fork' [-Wimplicit-
> function-declaration]
>    pid_t pid = fork();

Yes, but not gcc.  You're using some other installation of gcc.
In bash `type -all gcc` will show you the gcc's it finds, in order.
(It may find the same one multiple times because of links.)

bash is happy to invoke things in the Windows directories if
they're on your path.  For example, `type cmd` shows the
Windows cmd command line for me.

I believe the signal's name is SIGCHLD, not SIGCHILD.

Best - EM

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

[Yeo Kai Wei]

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
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

What should I do next?


Thank you.


Kind Regards,

YEO Kai Wei

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

[Eliot Moss]

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
> warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
> 
> 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
accomplish.

EM

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

[Yeo Kai Wei]

[-- Attachment #1: Type: text/plain, Size: 2991 bytes --]

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
> warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
>
> 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
accomplish.

EM

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

[Eliot Moss]

Ok ... assuming the "Modern C" is more or less POSIX based and
does not use things outside the realm of what cygwin supplies,
I think the answer is straightforward:

Make sure you install every program and every library that the
book uses.  There's not really such a thing as a "full install"
for Cygwin (and it would huge anyway), so you'll have to figure
out what going through the book demands.  Fortunately, you can
somewhat do that as you go, finding packages that need to be
installed.

Best wishes - EM

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

[Brian Inglis]

On 2023-02-06 21:28, Yeo Kai Wei via Cygwin 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.
>>> 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?
> 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
> warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
> What should I do next?

If you choose to install cygwin-devel in Cygwin Setup, it will install all the 
tools and files needed to develop under Cygwin, as well as rebuild Cygwin itself 
and most of the components and packages.

If you use the provided Desktop and Start Menu shortcuts to run bash under 
mintty, or both under Cygwin/X, you should be able to work as if under any Linux 
or similar distro.

You must have the virtual Cygwin paths 
/home/$USER/bin:/usr/bin:/bin:/usr/sbin:/sbin:... first in PATH and similar 
/usr/share/{man,info,awk} /usr/lib/gawk for {MAN,INFO,AWK,AWKLIB}PATH in your 
preferred shell initialization files e.g. in bash $OSTYPE == "cygwin".

-- 
Take care. Thanks, Brian Inglis			Calgary, Alberta, Canada

La perfection est atteinte			Perfection is achieved
non pas lorsqu'il n'y a plus rien à ajouter	not when there is no more to add
mais lorsqu'il n'y a plus rien à retirer	but when there is no more to cut
			-- Antoine de Saint-Exupéry

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

[Yeo Kai Wei]

On 7/2/2023 1:53 pm, Brian Inglis wrote:
> On 2023-02-06 21:28, Yeo Kai Wei via Cygwin 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.
>>>> 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?
>> 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
>> warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR 
>> PURPOSE.
>> What should I do next?
>
> If you choose to install cygwin-devel in Cygwin Setup, it will install 
> all the tools and files needed to develop under Cygwin, as well as 
> rebuild Cygwin itself and most of the components and packages.
>
> If you use the provided Desktop and Start Menu shortcuts to run bash 
> under mintty, or both under Cygwin/X, you should be able to work as if 
> under any Linux or similar distro.
>
> You must have the virtual Cygwin paths 
> /home/$USER/bin:/usr/bin:/bin:/usr/sbin:/sbin:... first in PATH and 
> similar /usr/share/{man,info,awk} /usr/lib/gawk for 
> {MAN,INFO,AWK,AWKLIB}PATH in your preferred shell initialization files 
> e.g. in bash $OSTYPE == "cygwin".


Hi Brian,

Thank you for the help.

I think I found the issue, I believe it's due to MinGW's build of gcc (I 
could be wrong).

I downloaded "gcc -core" and it worked.

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

[Hans-Bernhard Bröker]

Am 07.02.2023 um 07:59 schrieb Yeo Kai Wei via Cygwin:

> I think I found the issue, I believe it's due to MinGW's build of gcc (I 
> could be wrong).
> 
> I downloaded "gcc -core" and it worked.

You keep talking of "downloading" and "unpacking" things.  That 
indicates a continuing misunderstanding of how Cygwin is supposed to be 
installed and configured on your machine, and has been the cause of 
rather a lot of the confusion you've been going through.

You should never be doing any of that yourself.  You simply (re-)run 
Cygwin setup and select which packages to install.  As such, the process 
is really a case of "installing" things.  Downloading, unpacking and all 
that is handled by the setup program and its underlying database of 
packages and their relationships.

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

[Eliot Moss]

On 2/7/2023 7:25 AM, Yeo Kai Wei via Cygwin wrote:
> Hi,
> 
> I would like to report an issue with Cygwin 3.4.2 on Windows.
> 
> It doesn't seem to be able to work with  fd_set, FD_ZERO, FD_SET, FD_SETSIZE macros.
> 
> The code is in italics. The filename was selectStdIn.c. The terminal command used was "gcc -o 
> selectStdIn selectStdIn.c"
> 
> Thank you.

My guess is that those fd set things aren't POSIX, and cygwin tries to model POSIX.

Comments at the top of /usr/include/sys/select.h suggest that.

-- Eliot Moss