#[repr(C)]
pub struct utmpx {
    pub ut_type: c_short,
    pub ut_pid: pid_t,
    pub ut_line: [c_char; 32],
    pub ut_id: [c_char; 4],
    pub ut_user: [c_char; 32],
    pub ut_host: [c_char; 256],
    pub ut_exit: __exit_status,
    pub ut_session: i32,
    pub ut_tv: __timeval,
    pub ut_addr_v6: [i32; 4],
    /* private fields */
}
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.