strange bug : select() always generate 10022 error

[Sean Tang]

In the folowing code :
If I include <stdio.h> before <windows.h> and <winsock2.h>, select() always
generate 10022 error.
If I include <stdio.h> after <windows.h> and <winsock2.h>, select() works
OK.


#include <stdio.h>

#include <windows.h>
#define USE_SYS_TYPES_FD_SET
#include <winsock2.h>

int main(int argc, char *argv[]) {

WORD wVersionRequested;
WSADATA wsaData;
int err;
 
wVersionRequested = MAKEWORD( 2, 2 );
 
err = WSAStartup( wVersionRequested, &wsaData );
if ( err != 0 ) {
        printf("we could not find a usable WinSock DLL\n");
    return -1;
}
 
if ( LOBYTE( wsaData.wVersion ) != 2 || HIBYTE( wsaData.wVersion ) != 2 ) {
        printf("we could not find a usable WinSock DLL\n");
        WSACleanup( );
    return -1; 
}

        fd_set fds;
        
        int s= socket(AF_INET, SOCK_STREAM, 0);

        FD_ZERO(&fds);
        FD_SET((unsigned)s, &fds);

                if( select(s+1, &fds, NULL, NULL, 0) == -1 ) {
                        printf("socket error : %d\n", WSAGetLastError());
                        return -1;
        }

return 0;
}


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