#[repr(C)]
pub struct sigaction {
    pub sa_sigaction: sighandler_t,
    pub sa_mask: sigset_t,
    pub sa_flags: c_int,
    pub sa_restorer: Option<extern "C" fn()>,
}
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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.