Method enable

net_util/src/tap.rs:465–484

Enable the tap interface.

(&self)

    /// Enable the tap interface.
    pub fn enable(&self) -> Result<()> {
        let sock = create_unix_socket().map_err(Error::NetUtil)?;

        let mut ifreq = self.get_ifreq();

        // SAFETY: IOCTL with correct arguments
        unsafe { Self::ioctl_with_ref(&sock, libc::SIOCGIFFLAGS as c_ulong, &ifreq)? };

        // If TAP device is already up don't try and enable it
        // SAFETY: access a union field
        let ifru_flags = unsafe { ifreq.ifr_ifru.ifru_flags };
        if ifru_flags & libc::IFF_UP as i16 == libc::IFF_UP as i16 {
            return Ok(());
        }

        ifreq.ifr_ifru.ifru_flags = libc::IFF_UP as i16;

        // SAFETY: ioctl is safe. Called with a valid sock fd, and we check the return.
        unsafe { Self::ioctl_with_ref(&sock, libc::SIOCSIFFLAGS as c_ulong, &ifreq) }
    }

    /// Set the size of the vnet hdr.
    pub fn set_vnet_hdr_size(&self, size: c_int) -> Result<()> {