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Date: Tue, 7 Feb 2023 04:25:22 +0800
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Subject: [FEEDBACK] Issue with fd_set, FD_ZERO, FD_SET, FD_SETSIZE : Cygwin
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From: Yeo Kai Wei via Cygwin <cygwin AT cygwin DOT com>
Reply-To: Yeo Kai Wei <yeokaiwei AT hotmail DOT com>
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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


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