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>
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