#[repr(C)]
pub struct sembuf {
    pub sem_num: c_ushort,
    pub sem_op: c_short,
    pub sem_flg: c_short,
}
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.