#[repr(C)]
pub struct rtentry {Show 15 fields
    pub rt_pad1: c_ulong,
    pub rt_dst: sockaddr,
    pub rt_gateway: sockaddr,
    pub rt_genmask: sockaddr,
    pub rt_flags: c_ushort,
    pub rt_pad2: c_short,
    pub rt_pad3: c_ulong,
    pub rt_tos: c_uchar,
    pub rt_class: c_uchar,
    pub rt_pad4: [c_short; 3],
    pub rt_metric: c_short,
    pub rt_dev: *mut c_char,
    pub rt_mtu: c_ulong,
    pub rt_window: c_ulong,
    pub rt_irtt: c_ushort,
Performs copy-assignment from 
source. 
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Immutably borrows from an owned value. 
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Mutably borrows from an owned value. 
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Returns the argument unchanged.
Calls U::from(self).
That is, this conversion is whatever the implementation of
From<T> for U chooses to do.
The type returned in the event of a conversion error.
Performs the conversion.
The type returned in the event of a conversion error.
Performs the conversion.