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>
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