Function guile_sys::funopen

pub unsafe extern "C" fn funopen(
    arg1: *const c_void, 
    arg2: Option<unsafe extern "C" fn(arg1: *mut c_void, arg2: *mut c_char, arg3: c_int) -> c_int>, 
    arg3: Option<unsafe extern "C" fn(arg1: *mut c_void, arg2: *const c_char, arg3: c_int) -> c_int>, 
    arg4: Option<unsafe extern "C" fn(arg1: *mut c_void, arg2: fpos_t, arg3: c_int) -> fpos_t>, 
    arg5: Option<unsafe extern "C" fn(arg1: *mut c_void) -> c_int>
) -> *mut FILE