Function with_msghdr

pub(crate) unsafe fn with_msghdr<R>(
    addr: &impl SocketAddrArg,
    iov: &[IoSlice<'_>],
    control: &mut SendAncillaryBuffer<'_, '_, '_>,
    f: impl FnOnce(&msghdr) -> R,
) -> R

Create a message header intended to send with the specified address.

This creates a c::msghdr and calls a function f on it. The msghdr’s raw pointers may point to temporaries, so this function should avoid storing the pointers anywhere that would outlive the function call.

Safety

If f dereferences the pointers in the msghdr, it must do so only within the bounds indicated by the associated lengths in the msghdr.