Function libc::getsockopt

pub unsafe extern "C" fn getsockopt(
    sockfd: c_int, 
    level: c_int, 
    optname: c_int, 
    optval: *mut c_void, 
    optlen: *mut socklen_t
) -> c_int

🔬 This is a nightly-only experimental API. (libc)

use libc from crates.io