#[repr(C)]
pub struct shmid_ds {
    pub shm_perm: ipc_perm,
    pub shm_segsz: size_t,
    pub shm_atime: time_t,
    pub shm_dtime: time_t,
    pub shm_ctime: time_t,
    pub shm_cpid: pid_t,
    pub shm_lpid: pid_t,
    pub shm_nattch: shmatt_t,
    /* private fields */
}
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The type returned in the event of a conversion error.
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Performs the conversion.