Function xmlSaveToFd 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn xmlSaveToFd(
    fd: c_int,
    encoding: *const c_char,
    options: c_int,
) -> *mut _xmlSaveCtxt

xmlSaveCtxt *xmlSaveToFd(int fd, const char *encoding, int options).

SAFETY

• fd must be a valid open file descriptor.