nc 0.8.13

Access system calls directly
Documentation 
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/// Create a pair of connected socket.
pub unsafe fn socketpair(
    domain: i32,
    type_: i32,
    protocol: i32,
    sv: [i32; 2],
) -> Result<(), Errno> {
    let domain = domain as usize;
    let type_ = type_ as usize;
    let protocol = protocol as usize;
    let sv_ptr = sv.as_ptr() as usize;
    syscall4(SYS_SOCKETPAIR, domain, type_, protocol, sv_ptr).map(drop)
}