#[repr(C)]
pub struct rusage {Show 16 fields
    pub ru_utime: timeval,
    pub ru_stime: timeval,
    pub ru_maxrss: c_long,
    pub ru_ixrss: c_long,
    pub ru_idrss: c_long,
    pub ru_isrss: c_long,
    pub ru_minflt: c_long,
    pub ru_majflt: c_long,
    pub ru_nswap: c_long,
    pub ru_inblock: c_long,
    pub ru_oublock: c_long,
    pub ru_msgsnd: c_long,
    pub ru_msgrcv: c_long,
    pub ru_nsignals: c_long,
    pub ru_nvcsw: c_long,
    pub ru_nivcsw: c_long,
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.