Function getopt_long 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn getopt_long(
    argc: c_int,
    argv: *const *mut c_char,
    optstring: *const c_char,
    longopts: *const option,
    longindex: *mut c_int,
) -> c_int

Non-POSIX, see https://www.man7.org/linux/man-pages/man3/getopt.3.html.

Functions the same as getopt but also accepts long options.