int mark_fd_nonblock(int fd);
void para_fd_set(int fd, fd_set *fds, int *max_fileno);
__must_check int para_fread(void *dest, size_t nbytes, size_t nmemb, FILE *stream);
int mark_fd_nonblock(int fd);
void para_fd_set(int fd, fd_set *fds, int *max_fileno);
__must_check int para_fread(void *dest, size_t nbytes, size_t nmemb, FILE *stream);