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....@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
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