doorgo/door/input_windows.c

#include "input_windows.h"

 void init_wsa(void) {
    WSADATA wsa;
 	WSAStartup(WINSOCK_VERSION, &wsa); 
 }

 int windows_read(int fd, char *buffer, int len) {
    struct timeval tv;
    fd_set rfd;
    
    retry:
    FD_ZERO(&rfd);
    FD_SET(fd, &rfd);
    tv.tv_sec = 0;
    tv.tv_usec = 200;
    int rs;
    int ret;

    rs = select(fd+1, &rfd, NULL, NULL, &tv);
    if (errno == EINTR) {
        goto retry;
    }
    if (rs == -1)  {
        // error
        return -1;
    }

    if (rs == 0 ) {
        return 0;
    }

    if (FD_ISSET(fd, &rfd)) {
        ret = recv(fd, buffer, len, 0);
        if (ret == 0) {
            // select, recv = 0: connection closed.
            return -1;
        }
        return ret;
    }

    return -1;
 }